WO2021007964A1 - Fingerprint detection apparatus and electronic device - Google Patents

Fingerprint detection apparatus and electronic device Download PDF

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Publication number
WO2021007964A1
WO2021007964A1 PCT/CN2019/111103 CN2019111103W WO2021007964A1 WO 2021007964 A1 WO2021007964 A1 WO 2021007964A1 CN 2019111103 W CN2019111103 W CN 2019111103W WO 2021007964 A1 WO2021007964 A1 WO 2021007964A1
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WO
WIPO (PCT)
Prior art keywords
fingerprint detection
microlens
light
fingerprint
optical
Prior art date
Application number
PCT/CN2019/111103
Other languages
French (fr)
Chinese (zh)
Inventor
蒋鹏
马明
凌伟
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/CN2019/095880 external-priority patent/WO2021007730A1/en
Priority claimed from PCT/CN2019/099135 external-priority patent/WO2021022425A1/en
Priority claimed from PCT/CN2019/102366 external-priority patent/WO2021035451A1/en
Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to CN201980004247.1A priority Critical patent/CN111108511B/en
Publication of WO2021007964A1 publication Critical patent/WO2021007964A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition

Definitions

  • This application relates to the field of biometrics, and in particular to fingerprint detection devices and electronic equipment.
  • the under-screen optical fingerprint recognition technology is to install the optical fingerprint module under the display screen, and realize fingerprint recognition by collecting the optical fingerprint image.
  • the requirements for fingerprint recognition performance, size and cost are getting higher and higher.
  • the dry finger problem occurs.
  • the contact area between the dry finger and the display screen is very small, and the recognition response area is very small, resulting in discontinuous fingerprints and easy loss of feature points, which affects the performance of fingerprint recognition.
  • the present application provides a fingerprint detection device and electronic equipment, which can use a smaller chip area to achieve the same effective fingerprint identification field of view, thereby reducing the chip area and reducing the cost.
  • a fingerprint detection device which is suitable for under a display screen to realize under-screen optical fingerprint detection
  • the display screen includes a fingerprint detection area
  • the fingerprint detection area is used for finger touch to perform Fingerprint detection
  • the fingerprint detection device includes: a plurality of fingerprint detection units, the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to size parameters
  • the size parameter includes at least one of the following parameters: the field of view range of each fingerprint detection unit, the area of the fingerprint detection area, the thickness of the display screen, and the optical path surface of each fingerprint detection unit The distance to the bottom surface of the display screen.
  • each fingerprint detection unit includes: a microlens array, which is arranged under the display screen and includes a plurality of microlenses; at least one light blocking layer is arranged under the microlens array, and A plurality of light guide channels corresponding to each of the plurality of microlenses are formed, and each light guide channel of the plurality of light guide channels corresponding to each microlens corresponds to the light of each microlens.
  • the angle between the axes is less than 90°;
  • the optical sensing pixel array is arranged below the at least one light blocking layer and includes a plurality of optical sensing pixels, and each microlens corresponding to the plurality of light guide channels An optical sensing pixel is provided under each light guide channel, and the one optical sensing pixel is used to receive the optical signal converged by the microlens and transmitted through the corresponding light guide channel, and the optical signal is used to detect fingerprint information of the finger .
  • the fingerprint detection device including multiple fingerprint detection units of the embodiment of the present application can solve the following problems: 1. The problem of poor recognition effect of the vertical light signal on dry fingers; 2. The single-object telecentric microlens array solution The problem of too long exposure time; 3. The thickness of the fingerprint detection device is too large; 4. The tolerance of the fingerprint detection device is too poor; 5. The problem of the fingerprint detection device is too large; 6. The cost of the fingerprint detection device The problem is too high.
  • the sizes of the multiple fingerprint detection units are the same.
  • the plurality of fingerprint detection units located in the same row of the plurality of fingerprint detection units are separated by the same distance; and/or, The multiple fingerprint detection units located in the same column among the multiple fingerprint detection units have the same separation distance.
  • the number of the plurality of fingerprint detection units is two.
  • two fingerprint detection units are arranged side by side.
  • the size parameter includes: the field of view range of each fingerprint detection unit on the upper surface of the display screen is When the edges of each fingerprint detection unit are expanded by at least a first value X, the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, The length of each fingerprint detection unit is greater than or equal to Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance between the two fingerprint detection units is less than or equal to 2X.
  • the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3 mm outside the edge of each fingerprint detection unit, and the area of the fingerprint detection area In the case of greater than or equal to 6mm*6mm, the length of each fingerprint detection unit is greater than or equal to 5.4mm, the width of each fingerprint detection unit is greater than or equal to 2.4mm, and the distance between the two fingerprint detection units The horizontal distance is less than or equal to 0.6mm.
  • the length of each fingerprint detection unit is 6 mm
  • the width of each fingerprint detection unit is 2.3 mm
  • the two The horizontal distance between the fingerprint detection units is 1mm.
  • the length of each fingerprint detection unit is 6.5 mm
  • the width of each fingerprint detection unit is 2.6 mm
  • the The horizontal distance between the two fingerprint detection units is 1mm.
  • the number of the plurality of fingerprint detection units is four.
  • the four fingerprint detection units are arranged in a 2*2 matrix.
  • the size parameter includes: the field of view range of each fingerprint detection unit on the upper surface of the display screen is When the edges of each fingerprint detection unit are expanded by at least a first value X, the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, The length of each fingerprint detection unit is greater than or equal to 0.5Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance between two adjacent fingerprint detection units in the horizontal direction is less than Or equal to 2X, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is less than or equal to 2X.
  • the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3 mm outside the edge of each fingerprint detection unit, and the area of the fingerprint detection area
  • the length of each fingerprint detection unit is greater than or equal to 2.4mm
  • the width of each fingerprint detection unit is greater than or equal to 2.4mm
  • two adjacent fingerprints in the horizontal direction are detected
  • the horizontal distance between the units is less than or equal to 0.6 mm
  • the vertical distance between two adjacent fingerprint detection units in the vertical direction is less than or equal to 0.6 mm.
  • the length of each fingerprint detection unit is 2.3 mm
  • the width of each fingerprint detection unit is 2.3 mm
  • the horizontal direction The horizontal distance between two adjacent fingerprint detection units above is 1.2 mm
  • the vertical distance between two adjacent fingerprint detection units in the vertical direction is 1.2 mm.
  • the length of each fingerprint detection unit is 2.6 mm
  • the width of each fingerprint detection unit is 2.6 mm
  • the horizontal direction The horizontal distance between two adjacent fingerprint detection units above is 1 mm
  • the vertical distance between two adjacent fingerprint detection units in the vertical direction is 1 mm.
  • the bottoms of the multiple light guide channels corresponding to each microlens respectively extend below the adjacent multiple microlenses.
  • the bottoms of the multiple light guide channels corresponding to each microlens are located under the same microlens.
  • the multiple light guide channels corresponding to each microlens are centrally symmetrically distributed along the optical axis direction of the same microlens.
  • each of the plurality of light guide channels corresponding to each microlens and the first plane form a preset clip Angle, so that the multiple optical sensing pixels arranged under each microlens are respectively used to receive the optical signals converged by one or more microlenses and transmitted through the corresponding light guide channel, wherein the first plane Is a plane parallel to the display screen.
  • the preset included angle ranges from 15 degrees to 60 degrees.
  • the projection of the multiple light guide channels corresponding to each microlens on the first plane is relative to the optical axis of the same microlens Symmetrically distributed at the projection center of the first plane.
  • the optical sensing pixel array includes multiple sets of optical sensing pixels, and the optical sensing pixels in the multiple sets of optical sensing pixels receive The directions of the light guide channels through which the light signals pass are the same, the multiple groups of optical sensing pixels are used to receive light signals in multiple directions to obtain multiple images, and the multiple images are used to detect fingerprint information of a finger.
  • a set of optical sensing pixels in the plurality of sets of optical sensing pixels are used to receive light signals in one of the multiple directions Obtain one of the plurality of images.
  • the number of pixels in each group of pixels in the plurality of groups of pixels is equal, and the arrangement manner is the same.
  • one optical sensing pixel in a set of optical sensing pixels in the plurality of sets of optical sensing pixels corresponds to a pixel in an image .
  • consecutive multiple optical sensing pixels in a set of optical sensing pixels in the plurality of sets of optical sensing pixels correspond to One pixel.
  • the distribution of the plurality of optical sensing pixels under each microlens is polygonal.
  • the polygon is a rectangle or a rhombus.
  • the at least one light-blocking layer is a plurality of light-blocking layers, and the different light-blocking layers are provided with each corresponding microlens At least one opening of the microlens to form a plurality of light guide channels corresponding to each microlens.
  • the number of openings corresponding to the same microlens in different light blocking layers increases sequentially from top to bottom.
  • the apertures of the openings in different light blocking layers corresponding to the same microlens are sequentially reduced from top to bottom.
  • a plurality of openings corresponding to each microlens are provided in the bottom light-blocking layer of the plurality of light-blocking layers
  • the multiple light guide channels corresponding to each microlens respectively pass through multiple openings corresponding to the same microlens in the bottom light blocking layer.
  • the non-underlying light-blocking layer of the plurality of light-blocking layers is in the two adjacent microlenses of the plurality of microlenses.
  • the middle position of the back focus of the lens is provided with an opening, and the two light guide channels corresponding to the two adjacent microlenses both pass through the two adjacent microlenses in the non-bottom light blocking layer.
  • the openings of each microlens corresponding to the plurality of light guide channels respectively extend below the adjacent plurality of microlenses.
  • the top light-blocking layer of the plurality of light-blocking layers is provided with an opening on the optical axis of each microlens
  • the multiple light guide channels corresponding to each microlens pass through the corresponding openings of the same microlens in the top light blocking layer.
  • the at least one light blocking layer includes only one light blocking layer, and the multiple light guide channels are the one light blocking layer Multiple oblique through holes corresponding to the same micro lens in.
  • the thickness of the one light blocking layer is greater than a preset threshold, so that the multiple optical sensors provided under each microlens The pixels are respectively used to receive the optical signals converged through one or more microlenses and transmitted through the corresponding light guide channels.
  • each fingerprint detection unit further includes: a transparent medium layer disposed at at least one of the following positions:
  • the at least one light-blocking layer and the microlens array are integrated, or the at least one light-blocking layer and the The optical sensor pixel array is integrated.
  • each microlens satisfies at least one of the following conditions: the condensing surface of the microlens is perpendicular to its optical axis The projection on the plane of the microlens is rectangular or circular; the condensing surface of the microlens is an aspheric surface; the curvature of the condensing surface of the microlens is the same in all directions; the microlens includes at least one lens; and The focal length range of the microlens is 10um-2mm.
  • the microlens array satisfies at least one of the following conditions: the microlens array is arranged in a polygonal shape, and the microlens array The range of duty cycle is 100%-50%.
  • the period of the microlens array is not equal to the period of the optical sensing pixel array, and the period of the microlens array is The period of the optical sensing pixel array is a rational multiple of the period.
  • the distance between the fingerprint detection device and the display screen is 20um-3000um.
  • each fingerprint detection unit further includes: a filter layer disposed at at least one of the following positions: the microlens Above the array and between the micro lens array and the optical sensing pixel array.
  • an electronic device including: a display screen; and a fingerprint detection device according to the first aspect or any possible implementation of the first aspect.
  • the display screen includes a fingerprint detection area, and the fingerprint detection area is used to provide a touch interface for a finger.
  • Fig. 1 is a schematic front view of an electronic device according to an embodiment of the present application.
  • FIG. 2 is a schematic cross-sectional view of the electronic device in FIG. 1 according to an embodiment of the present application.
  • Fig. 3 is a front view of a fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
  • Fig. 4 is a front view of another fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
  • FIG. 5 is a schematic top view of any microlens and its corresponding optical sensing pixel in the fingerprint detection unit of the embodiment of the present application.
  • FIG. 6 is another schematic top view of any microlens and its corresponding optical sensing pixel in the fingerprint detection unit of the embodiment of the present application.
  • Fig. 7 is a front view of another fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
  • Fig. 8 is a front view of another fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
  • FIG. 9 is a schematic diagram of the field of view of the fingerprint detection device with a single fingerprint detection unit according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a calculation method of the field of view of a fingerprint detection device with a single fingerprint detection unit according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of the field of view of the fingerprint detection device with multiple fingerprint detection units according to an embodiment of the present application.
  • Fig. 12 is a schematic front view of the arrangement of two fingerprint detection units according to an embodiment of the present application.
  • Fig. 13 is a schematic front view of the arrangement of four fingerprint detection units according to an embodiment of the present application.
  • Fig. 14 is a schematic side view of the arrangement of four fingerprint detection units according to an embodiment of the present application.
  • the technical solutions of the embodiments of the present application can be applied to various electronic devices.
  • portable or mobile computing devices such as smartphones, notebook computers, tablet computers, and gaming devices, as well as other electronic devices such as electronic databases, automobiles, and bank automated teller machines (ATM).
  • ATM bank automated teller machines
  • the embodiments of the present application are not limited thereto.
  • biometric recognition technology includes but is not limited to fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition.
  • fingerprint recognition technology includes but is not limited to fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition.
  • fingerprint recognition technology uses fingerprint recognition technology as an example.
  • the under-screen fingerprint recognition technology refers to the installation of the fingerprint recognition module below the display screen, so as to realize the fingerprint recognition operation in the display area of the display screen. There is no need to set a fingerprint collection area on the front of the electronic device except for the display area.
  • the fingerprint recognition module uses the light returned from the top surface of the display assembly of the electronic device to perform fingerprint sensing and other sensing operations. This returned light carries information about objects (such as fingers) that are in contact with or close to the top surface of the display assembly.
  • the fingerprint recognition module located under the display assembly collects and detects this returned light to realize fingerprint recognition under the screen.
  • the design of the fingerprint recognition module can be to realize the desired optical imaging by appropriately configuring the optical elements for collecting and detecting the returned light, so as to detect the fingerprint information of the finger.
  • in-display fingerprint recognition technology refers to the installation of fingerprint recognition modules or part of fingerprint recognition modules inside the display screen, so as to realize fingerprint recognition operations in the display area of the display screen without the need for electronic
  • the fingerprint collection area is set on the front of the device except the display area.
  • FIG. 1 is a front view of the electronic device 10
  • FIG. 2 is a schematic cross-sectional view of the electronic device 10 shown in FIG.
  • the electronic device 10 may include a display screen 120 and an optical fingerprint recognition module 130.
  • the display screen 120 may be a self-luminous display, which uses a self-luminous display unit as display pixels.
  • the display screen 120 may be an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen.
  • the display screen 120 may also be a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display, which is not limited in the embodiment of the present application.
  • the display screen 120 may also be specifically a touch display screen, which can not only perform screen display, but also detect a user's touch or press operation, thereby providing a user with a human-computer interaction interface.
  • the electronic device 10 may include a touch sensor.
  • the touch sensor may specifically be a touch panel (TP), which may be provided on the surface of the display screen 120, or may be partially integrated or integrated into Inside the display screen 120, a touch-sensitive display screen is formed.
  • TP touch panel
  • the optical fingerprint module 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131 (also may be referred to as optical sensing pixels, photosensitive pixels, pixel units, etc.).
  • the area where the sensing array 133 is located or its sensing area is the fingerprint detection area 103 corresponding to the optical fingerprint module 130 (also referred to as fingerprint collection area, fingerprint recognition area, etc.).
  • the optical fingerprint module 130 is arranged in a partial area below the display screen 120.
  • the fingerprint detection area 103 may be located in the display area of the display screen 120.
  • the optical fingerprint module 130 can also be arranged in other positions, such as the side of the display screen 120 or the non-transparent area of the edge of the electronic device 10, and the optical fingerprint module 130 can be designed to remove The optical signal of at least a part of the display area of the screen 120 is guided to the optical fingerprint module 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
  • the electronic device 10 when the user needs to unlock the electronic device 10 or perform other fingerprint verification, he only needs to press his finger on the fingerprint detection area 103 located on the display screen 120 to implement fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 adopting the above structure does not need to reserve space on the front side to set fingerprint buttons (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the display screen 120 can be It basically extends to the front of the entire electronic device 10.
  • fingerprint buttons such as the Home button
  • the optical fingerprint module 130 may include a light detecting part 134 and an optical component 132.
  • the light detection part 134 includes a sensor array 133 (also called an optical fingerprint sensor) and a reading circuit and other auxiliary circuits electrically connected to the sensor array 133, which can be fabricated on a chip (Die) by a semiconductor process , Such as optical imaging chip or optical fingerprint sensor.
  • the sensing array 133 is specifically a photodetector (photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetector can be used as the aforementioned optical sensing unit.
  • the optical component 132 may be disposed above the sensing array 133 of the light detection part 134, and it may specifically include a filter layer (Filter), a light guide layer or a light path guiding structure, and other optical elements.
  • the filter layer may be used for The ambient light penetrating the finger is filtered out, and the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensing array 133 for optical detection.
  • the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component.
  • the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the light detection part 134 is located, for example, the optical component 132 can be attached to the chip.
  • the optical component 132 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the light detection part 134 is located, for example, the optical component 132 can be attached to the chip.
  • the optical assembly 132 are integrated into the above-mentioned chip.
  • the area or light sensing range of the sensing array 133 of the optical fingerprint module 130 corresponds to the fingerprint detection area 103 of the optical fingerprint module 130.
  • the fingerprint collection area 103 of the optical fingerprint module 130 may be equal to or not equal to the area or light sensing range of the sensing array 133 of the optical fingerprint module 130, which is not specifically limited in the embodiment of the present application.
  • the fingerprint detection area 103 of the optical fingerprint module 130 can be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130.
  • the area of the fingerprint detection area 103 of the optical fingerprint module 130 can be larger than that of the optical fingerprint module 130.
  • the area of the sensing array 133 can be larger than that of the optical fingerprint module 130.
  • the light path guiding structure that the optical assembly 132 may include is exemplified below.
  • the optical collimator may be specifically a collimator (Collimator) layer fabricated on a semiconductor silicon wafer, which has multiple A collimating unit or a micro-hole, the collimating unit can be specifically a small hole.
  • the reflected light reflected from the finger the light that is perpendicularly incident on the collimating unit can pass through and be received by the sensor chip below it, and the incident angle Excessive light is attenuated by multiple reflections inside the collimating unit, so each sensor chip can basically only receive the reflected light reflected by the fingerprint lines directly above it, which can effectively improve the image resolution and thereby improve the fingerprint Recognition effect.
  • the light path guiding structure may be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses, which
  • the sensor array 133 of the light detecting part 134 is used to converge the reflected light reflected from the finger to the sensor array 133 of the light detection part 134 below, so that the sensor array 133 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger.
  • the optical lens layer may also have a pinhole or a micro-aperture formed in the optical path of the lens unit, for example, one or more light-shielding sheets may be formed in the light path of the lens unit, of which at least one light-shielding sheet A light-transmitting micro-hole may be formed in the optical axis or optical center area of the lens unit, and the light-transmitting micro-hole may be used as the aforementioned pinhole or micro-aperture.
  • the pinhole or micro-aperture diaphragm can cooperate with the optical lens layer and/or other optical film layers above the optical lens layer to expand the field of view of the optical fingerprint module 130 to improve the fingerprint imaging effect of the optical fingerprint module 130 .
  • the light path guiding structure may include a micro lens array formed by a plurality of micro lenses, which may be formed in the light path through a semiconductor growth process or other processes.
  • the light detecting part 134 is above the sensing array 133, and each microlens can correspond to one of the sensing units of the sensing array 133, respectively.
  • other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer.
  • the microlens layer and the sensing unit may also include a light blocking layer (or called a light blocking layer, a light blocking layer, etc.) with micro holes (or called openings), wherein the micro holes are formed in Between the corresponding micro lens and the sensing unit, the light blocking layer can block the optical interference between the adjacent micro lens and the sensing unit, and make the light corresponding to the sensing unit converge into the micro hole through the micro lens and It is transmitted to the sensing unit through the microhole for optical fingerprint imaging.
  • a light blocking layer or called a light blocking layer, a light blocking layer, etc.
  • micro holes or called openings
  • optical path guiding structure can be used alone or in combination with each other.
  • a micro lens layer may be further provided above or below the collimator layer or the optical lens layer.
  • the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific laminated structure or optical path may need to be adjusted according to actual needs.
  • the optical component 132 may also include other optical elements, such as a filter or other optical films, which may be arranged between the optical path guiding structure and the optical fingerprint sensor or on the display screen 120. Between it and the optical path guiding structure, it is mainly used to isolate the influence of external interference light on optical fingerprint detection.
  • the filter layer can be used to filter out the ambient light that penetrates the finger and enters the optical fingerprint sensor through the display screen 120. Similar to the optical path guiding structure, the filter layer can be separately provided for each optical fingerprint sensor. In order to filter out the interference light, a large-area filter layer can also be used to simultaneously cover the multiple optical fingerprint sensors.
  • the fingerprint identification module 140 can be used to collect user fingerprint information (such as fingerprint image information).
  • the optical fingerprint module 130 can use the display unit (that is, the OLED light source) of the OLED display 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection.
  • the display unit that is, the OLED light source
  • the display screen 120 emits a beam of light 111 to the target finger 140 above the fingerprint detection area 103.
  • the light 111 is reflected on the surface of the finger 140 to form reflected light or passes through the finger 140. Internal scattering forms scattered light (transmitted light).
  • the above-mentioned reflected light and scattered light are collectively referred to as return light.
  • the ridge 141 and valley 142 of the fingerprint have different light reflection capabilities
  • the reflected light 151 from the fingerprint ridge and the reflected light 152 from the fingerprint valley have different light intensities, and the reflected light passes through the optical component 132. After that, it is received by the sensor array 133 in the optical fingerprint module 130 and converted into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby
  • the electronic device 10 implements an optical fingerprint recognition function.
  • the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection and identification.
  • the optical fingerprint module 130 can be applied not only to self-luminous displays such as OLED displays, but also to non-self-luminous displays, such as liquid crystal displays or other passive light-emitting displays.
  • the optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection, and the excitation light source may specifically be infrared
  • the light source or a light source of non-visible light of a specific wavelength can be arranged under the backlight module of the liquid crystal display or in the edge area under the protective cover of the electronic device 10, and the optical fingerprint module 130 can be provided with a liquid crystal panel or a protective cover Under the edge area of the board and guided by the light path so that the fingerprint detection light can reach the optical fingerprint module 130; or, the optical fingerprint module 130 can also be arranged under the backlight module, and the backlight module passes through the diffuser,
  • the film layers such as the brightness enhancement sheet and the reflective sheet are provided with holes or other optical designs to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130.
  • the electronic device 10 may further include a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, which is located above the display screen 120 and covers the front surface of the electronic device 10. Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.
  • a transparent protective cover plate which may be a glass cover plate or a sapphire cover plate
  • the optical fingerprint module 130 may only include one optical fingerprint sensor.
  • the fingerprint detection area 103 of the optical fingerprint module 130 has a small area and a fixed position. Therefore, the user needs to press the finger to The specific position of the fingerprint detection area 103, otherwise the optical fingerprint module 130 may not be able to collect the fingerprint image, resulting in poor user experience.
  • the optical fingerprint module 130 may specifically include multiple optical fingerprint sensors. The plurality of optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the plurality of optical fingerprint sensors together constitute the fingerprint detection area 103 of the optical fingerprint module 130.
  • the fingerprint detection area 103 of the optical fingerprint module 130 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Further, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.
  • the embodiment of the present application provides a fingerprint detection device, which can solve the problem that the current fingerprint recognition scheme has poor fingerprint recognition effect on dry fingers, that is, can improve the fingerprint recognition performance on dry fingers.
  • the fingerprint detection device of the embodiment of the present application is suitable for under the display screen to realize the under-screen optical fingerprint detection.
  • the fingerprint detection device in the embodiment of the present application includes multiple fingerprint detection units. In the following, any one of the multiple fingerprint detection units will be described in detail with reference to FIGS. 3 to 8.
  • FIG. 3 and FIG. 4 both show a schematic diagram of the fingerprint detection unit 20 according to an embodiment of the present application.
  • the fingerprint detection unit 20 may be applicable to the electronic device 10 shown in FIGS. 1 to 2, or the fingerprint detection unit 20 may be the optical fingerprint module 130 shown in FIGS. 1 to 2.
  • the fingerprint detection unit 20 may include a micro lens array 210, at least one light blocking layer, and an optical sensing pixel array 240.
  • the microlens array 210 can be used to be arranged under the display screen of an electronic device, the at least one light blocking layer can be arranged under the microlens array 210, and the optical sensing pixel array 240 can be arranged on the at least one light blocking layer. Below the layer.
  • the microlens array 210 and the at least one layer of light blocking layer may be the light guide structure included in the optical assembly 132 shown in FIG. 2, and the optical sensing pixel array 240 may be the light guide structure shown in FIGS.
  • a sensing array 133 of one optical sensing unit 131 also referred to as optical sensing pixels, photosensitive pixels, pixel units, etc., for the sake of brevity, it will not be repeated here.
  • the microlens array 210 may include a plurality of microlenses.
  • the microlens array 210 may include a first microlens 211, a second microlens 212, and a third microlens 213.
  • the at least one light blocking layer may include a plurality of light blocking layers.
  • the at least one light blocking layer may include a first light blocking layer 220 and a second light blocking layer 230.
  • the optical sensing pixel array 240 may include a plurality of optical sensing pixels. For example, as shown in FIGS.
  • the optical sensing pixel array 240 may include a first optical sensing pixel 241, a second optical sensing pixel 242, and a third optical sensing pixel.
  • each microlens in the microlens array 210 can be filled in a circle or a square shape; in addition, the material of each microlens in the microlens array 210 can be plastic or glass;
  • the production process of each microlens in the lens array 210 can be implemented by a micro-nano processing process or a compression molding process, and the embodiment of the present application is not limited thereto.
  • the at least one light blocking layer and the microlens array 210 may be integratedly arranged, or the at least one light blocking layer and the optical sensing pixel array 240 may be integratedly arranged, even the microlens array 210,
  • the at least one light blocking layer and the optical sensing pixel 240 are integrated into one component, and the embodiment of the present application is not limited thereto.
  • each microlens in the microlens array 210 may satisfy at least one of the following conditions: the projection of the condensing surface of the microlens on a plane perpendicular to its optical axis is rectangular or circular; The condensing surface of the lens is spherical or aspheric; the curvature of the condensing surface of the microlens is the same in all directions; the microlens includes at least one lens; and the focal length of the microlens is in the range of 10um-2mm.
  • the microlens array 210 satisfies at least one of the following conditions: the microlens array 210 is in a polygonal arrangement and the duty cycle of the microlens array 210 ranges from 100% to 50%.
  • the microlens array 210 is arranged in a square or hexagonal shape.
  • the duty cycle of the micro lens array 210 is 85%.
  • the period of the microlens array 210 is not equal to the period of the optical sensing pixel array 240, and the period of the microlens array 210 is a rational multiple of the period of the optical sensing pixel array 240, thereby avoiding Moiré fringes appear during fingerprint imaging and improve fingerprint recognition.
  • the distance between the fingerprint detection unit 20 and the display screen can be set according to actual applications. For example, it can be set to 20um-1000um to ensure that the fingerprint detection unit 20 has a sufficient safety distance from the display screen. Therefore, it is ensured that the fingerprint detection unit 20 does not hit the display screen due to the vibration or fall of the electronic device, and the device is not damaged.
  • At least one light blocking layer of the embodiment of the present application is formed with a plurality of light guide channels corresponding to each microlens in the microlens array 210, and each light guide channel in the plurality of light guide channels corresponding to each microlens
  • the angle between the optical axis of the channel and the corresponding microlens is less than 90°, that is, for any one microlens, the corresponding multiple light guide channels are all inclined rather than vertical.
  • the aforementioned included angle may be the included angle between the central axis of the light guide channel and the optical axis of the microlens, or the included angle between any straight line passing through the light guide channel and the optical axis; in addition,
  • the value range of the included angle can be any range from 0° to 90°.
  • the range of the included angle can be 15° to 60°, or 10° to 70°.
  • the included angle can be equal to 20°, or may be equal to 40°, but the embodiment of the present application is not limited thereto.
  • the angle between the light guide channel and the optical axis of the corresponding microlens can be set to any value not equal to 90° according to actual applications.
  • the microlens array 210 and the at least one light blocking layer can be adjusted appropriately.
  • the distance between the optical sensing pixel array 240 to adjust the angle between the light guide channel and the optical axis of the corresponding micro lens Since the angle between the light guide channel and the optical axis of the corresponding microlens is not equal to 90°, the bottom of multiple light guide channels of the same microlens may be located under the same microlens, or may be located at different microlens Below.
  • the bottoms of multiple light guide channels corresponding to the microlens may still be located below the microlens, for example, as shown in FIG. 4.
  • the bottoms of the multiple light guide channels corresponding to the microlens may not be located below the microlens, but are located below other different microlenses.
  • the bottoms of multiple light guide channels corresponding to the same microlens may respectively extend below multiple adjacent microlenses, for example, as shown in FIG. 3; or, multiple light guide channels corresponding to the same microlens
  • the bottom of the microlens may also respectively extend below other microlenses that are not adjacent to the microlens, and the embodiment of the present application is not limited to this.
  • the distance between the microlens array 210, at least one light blocking layer and the optical sensing pixel array 240 can be adjusted. Alternatively, it can be achieved by adjusting the size of the angle between the light guide channel and the optical axis of the corresponding microlens. For brevity, it will not be repeated here.
  • the first light-blocking layer 220 and the second light-blocking layer 230 are respectively provided with at least one opening to facilitate the formation of each of the plurality of microlenses (ie, the first The microlens 211, the second microlens 212, and the third microlens 213) correspond to multiple light guide channels.
  • the hole included in the area covered by the position below each microlens is taken as an example for description, which is hereinafter referred to as the coverage of the microlens.
  • the coverage of the microlens For example, in FIG.
  • the first light blocking layer 220 is provided with a first opening 221 and a second opening 222 covered by the first microlens 211; the first light blocking layer 220 is also provided with a second microlens The second opening 222 and the third opening 223 within the coverage of the lens 212; the first light blocking layer 220 is also provided with the third opening 223 and the fourth opening 224 within the coverage of the third microlens 213;
  • the second light blocking layer 230 is provided with a fifth opening 231 and a sixth opening 232 covered by the first microlens 211; the second light blocking layer 230 is also provided with a The seventh opening 233 and the eighth opening 234 within the coverage of the two microlenses 212; the second light blocking layer 230 is also provided with a ninth opening 235 and the tenth opening within the coverage of the third microlens 213 236.
  • Figure 4 there are similar settings in Figure 4, and the specific settings are shown in Figure 4, which will not be repeated here.
  • the second microlens 212 is mainly used as an example for description below, but the related description can also be applied to the first microlens 211 and the third microlens 213.
  • the plurality of light guide channels corresponding to the second microlens 212 may include a light guide channel formed by a second opening 222 and a sixth opening 232, and a third opening 223 and The light guide channel formed by the ninth opening 235.
  • the light guide channel formed by the second opening 222 and the sixth opening 232 extends below the first microlens 211
  • the light guide channel formed by the third opening 223 and the ninth opening 235 extends to the third Below the micro lens 213. As shown in FIG.
  • the plurality of light guide channels corresponding to the second microlens 212 may include: a light guide channel formed by an opening 226 and an opening 233, a light guide channel formed by an opening 226 and an opening 234, The light guide channel formed by the opening 227 and the opening 233 and the light guide channel formed by the opening 227 and the opening 234.
  • the four light guide channels described above all extend below the second microlens 211.
  • the hole corresponding to any one microlens described in the embodiments of the present application refers to the multiple holes through which its corresponding light guide channel passes.
  • the hole corresponding to the second microlens 212 refers to its light guide channel.
  • the hole corresponding to the second microlens 212 in FIG. 3 may include the holes through which the two light guide channels pass, that is, the hole corresponding to the second microlens 212 includes at least the second opening 222 and the second opening 222.
  • Six openings 232, third openings 223, and ninth openings 235; for another example, the holes corresponding to the second microlens 212 in FIG. 4 may include the holes of the four light guide channels mentioned above, namely the openings 226 and the openings. 227. Opening 233 and opening 234.
  • an optical sensing pixel may be provided under each of the light guide channels corresponding to each micro lens in the micro lens array 210.
  • a second optical sensing pixel 242 is provided below the light guide channel formed by the second opening 222 and the sixth opening 232, and the third opening 223 and A fifth optical sensing pixel 245 is provided under the light guide channel formed by the ninth opening 235.
  • the light guide channel formed by the opening 226 and the opening 233 and the light guide channel formed by the opening 227 and the opening 233 are both provided with a third optical sensing pixel 243;
  • the light guide channel formed by the opening 226 and the opening 234 and the light guide channel formed by the opening 227 and the opening 234 are both provided with a fourth optical sensing pixel 244.
  • a plurality of optical sensing pixels are arranged below each microlens in the microlens array 210, and the plurality of optical sensing pixels arranged below each microlens are respectively used for receiving convergents through one or more microlenses.
  • the optical signal transmitted through the corresponding light guide channel is used to detect the fingerprint information of the finger.
  • the plurality of optical sensing pixels arranged under the microlens are respectively used for receiving through the microlens
  • the plurality of optical sensing pixels arranged below are respectively used to receive the optical signals converged by the adjacent plurality of microlenses and transmitted through the corresponding light guide channel.
  • two optical sensing pixels are provided in the range directly below the coverage of the second microlens 212 in FIG. 3, that is, the second microlens 212
  • a third optical sensing pixel 243 and a fourth optical sensing pixel 244 may be provided below, wherein the third optical sensing pixel 243 may be used to receive the converged by the first microlens 211 and pass through the second opening 222 and the seventh aperture.
  • the oblique light signal transmitted by the light guide channel formed by the opening 233, the fourth optical sensing pixel 244 can be used to receive the light converging through the third microlens 213 and passing through the guide formed by the third opening 223 and the eighth opening 234
  • the oblique light signal transmitted by the optical channel, and both the first micro lens 211 and the third micro lens 213 are adjacent to the second micro lens 212.
  • a third optical sensor may be arranged under the second microlens 212.
  • the fourth optical sensing pixel 244 can also be used for The oblique
  • the number of multiple optical sensing pixels under each microlens in the microlens array 210 can be set according to actual applications. For example, in the embodiment of the present application, it is assumed that 4 optical sensing pixels are arranged under each microlens. For example, or, under each microlens, there may be 9 optical sensing pixels, or other numbers may be set, and the embodiment of the present application is not limited to this.
  • the distribution of multiple optical sensing pixels under each microlens may be polygonal. For example, the polygon includes but is not limited to a rectangle or a diamond.
  • the distribution of multiple optical sensing pixels under each microlens in the microlens array 210 may be circular or elliptical.
  • FIG. 5 and FIG. 6 are two schematic top views of the second microlens 212 shown in FIG. 3 or FIG. 4, respectively. As shown in Figures 5 and 6, it is assumed here that four optical sensing pixels can be arranged under the second microlens 212. The distribution of the four optical sensing pixels in Figure 5 is rectangular, and the four microlenses in Figure 6 The distribution of can be presented as a diamond.
  • the embodiment of the present application does not limit the specific corresponding manner of each microlens and the optical sensing pixel below it.
  • the second micro lens 212 may cover part or all of the photosensitive area (AA) of the third optical sensing pixel 243.
  • the second microlens 212 may cover the photosensitive area (PD area, AA) of the third optical sensing pixel 243 that is converged by the first microlens 211 and passes through the first microlens 211.
  • the pixel 243 can receive enough light signals to improve the fingerprint recognition effect.
  • the multiple light guide channels corresponding to each microlens in the microlens array 210 may be centrally symmetrically distributed along the optical axis direction of the same microlens.
  • the light guide channel of the second microlens 212 can extend to the light guide channel below the microlens in the upper right corner and can extend to the lower left corner.
  • the light guide channel under the microlens is symmetrical along the optical axis direction of the second microlens 212; the light guide channel of the multiple light guide channels for the second microlens 212 can extend below the microlens in the upper left corner and
  • the light guide channel that can extend to the lower right corner of the microlens is also symmetrical along the optical axis of the second microlens 212.
  • the light guide channel in FIG. 4 is also similar, for the sake of brevity, it will not be repeated here.
  • each light guide channel of the plurality of light guide channels corresponding to each microlens in the microlens array 210 and the first plane may form a preset angle, so that each microlens A plurality of optical sensing pixels arranged under the lens are respectively used for receiving optical signals converged through one or more microlenses and transmitted through the corresponding light guide channel, wherein the first plane is a plane parallel to the display screen.
  • the preset included angle can ensure that the bottom ends of the multiple light guide channels corresponding to each microlens extend below the same microlens or extend below the adjacent multiple microlenses.
  • the plane on which the optical sensing pixel array 240 is located is parallel to the first plane, and is formed by the second opening 222 and the sixth opening 232
  • the light guide channel forms a first angle with the plane where the optical sensing pixel array 240 is located
  • the light guide channel formed by the third opening 223 and the ninth opening 235 forms a second angle with the plane where the optical sensing pixel array 240 is located.
  • the first angle is equal to the second angle.
  • the first angle may not be equal to the second angle, which is not limited in the embodiment of the present application.
  • the light guide channel in FIG. 4 is also similar, and for the sake of brevity, it will not be repeated here.
  • the preset included angle may be the included angle between the central axis of the light guide channel and the first plane, or the included angle between any straight line passing through the light guide channel and the first plane; in addition,
  • the range of the preset angle can be any range from 0 degrees to 90 degrees.
  • the range of the preset angle can be 15 degrees to 60 degrees, or 10 degrees to 70 degrees. This application does not Make specific restrictions.
  • the projection of the multiple light guide channels corresponding to each microlens in the microlens array 210 on the first plane may be symmetrical with respect to the projection of the optical axis of the same microlens on the first plane. Distribution to ensure that each optical sensing pixel in the optical sensing pixel array 240 can receive enough light signals, thereby improving the resolution of the fingerprint image and the fingerprint recognition effect.
  • each light guide channel is an inclined channel
  • the end surface of each light guide channel on the first plane is an ellipse.
  • the four light guide channels corresponding to the second microlens 212 are symmetrically distributed along the optical axis of the second microlens 212 at the end surface close to the optical sensing pixel array 240 on the projection center of the first plane.
  • the fingerprint detection unit 20 may include a plurality of light-blocking layers, and different light-blocking layers are provided with at least one opening corresponding to each microlens to form a plurality of corresponding microlenses.
  • Light guide channel may include the at least one light blocking layer.
  • the at least one light blocking layer may include the first light blocking layer 220 and the second light blocking layer 230 described above with respect to FIG. 3 or FIG. 4.
  • the fingerprint detection unit 20 may also include more light-blocking layers. Take FIG. 3 as an example.
  • FIG. 7 is an embodiment of the present application. Another schematic structural diagram of the fingerprint detection unit 20. As shown in FIG.
  • the fingerprint detection unit 20 may include a third light-blocking layer 260 in addition to the first light-blocking layer 220 and the second light-blocking layer 230 shown in FIG. 3, wherein the third light-blocking layer
  • the layer 260 includes an eleventh opening 261, a twelfth opening 262 and a thirteenth opening 263.
  • the following description mainly takes FIG. 3 and FIG. 7 as examples.
  • the number of openings corresponding to the same microlens in different light blocking layers may be the same, as shown in FIG. 4; or the number of openings corresponding to the same microlens in different light blocking layers is determined by The top to bottom can be increased or decreased in sequence to form multiple light guide channels corresponding to each microlens.
  • the number of openings in different light blocking layers corresponding to the same microlens can be increased sequentially from top to bottom.
  • the spacing between the openings in different light blocking layers can be sequentially increased from top to bottom Decrease.
  • the distance D between two adjacent openings in the first light blocking layer 220 is greater than the distance d between two adjacent openings in the second light blocking layer 230 .
  • the partial light-blocking layer and the lower part of the light-blocking layer with larger opening density can form multiple light guide channels for each microlens.
  • the manufacturing complexity of the at least one light-shielding layer can also be reduced and the strength of the upper part of the light-shielding layer can be increased.
  • the bottom light blocking layer of the plurality of light blocking layers may be provided with a plurality of openings corresponding to each microlens, and a plurality of light guide channels corresponding to each microlens respectively pass through the bottom layer.
  • a plurality of openings corresponding to the same micro lens in the light blocking layer For example, as shown in FIGS. 3 and 7, still taking the second microlens 212 as an example, the second light blocking layer 230 is provided with a sixth opening 232 and a ninth opening 235 corresponding to the second microlens 212. Two of the light guide channels of the second microlens 212 pass through the sixth opening 232 and the ninth opening 235 respectively.
  • the top light-blocking layer of the plurality of light-blocking layers may be provided with an opening on the optical axis of each microlens, and the plurality of light guide channels corresponding to the microlens all pass through the top layer The opening corresponding to the micro lens in the light blocking layer.
  • the third light blocking layer 260 may be provided with a twelfth opening at a position close to the first light blocking layer 220 in the optical axis direction of the second microlens 260. ⁇ 262.
  • a light guide channel corresponding to the second microlens 212 passes through the twelfth opening 262, the second opening 222, and the sixth opening 232, and another light guide channel corresponding to the second microlens 212 Passing through the twelfth opening 262, the third opening 223 and the ninth opening 235, that is, the two light guide channels of the second microlens 212 pass through the twelfth opening 262.
  • the non-bottom light-blocking layer of the multiple light-blocking layers is in the multiple microlens
  • the middle position of the back focus of the two adjacent microlenses may be provided with an opening, so the two light guide channels corresponding to the two adjacent microlenses pass through the adjacent light-blocking layer.
  • the two microlenses correspond to the openings.
  • the first light-blocking layer 220 may be disposed at an intermediate position between the back focus of the first microlens 211 and the back focus of the second microlens 212
  • the second opening 222, and each of the first microlens 211 and the second microlens 212 has a light guide channel passing through the second hole 222; similarly, the first light blocking layer 220 is in the third microlens
  • a third opening 223 may be provided in the middle of the back focus of the second microlens 213 and the back focus of the second microlens 212, and each of the third microlens 213 and the second microlens 212 has a light guide channel passing through the The third opening 223.
  • the apertures of the openings corresponding to the same microlens in different light-blocking layers can also be increased, decreased, or unchanged in order from top to bottom, so as to filter out the desired reception of the optical sensing pixel array 240.
  • Light signal can also be increased, decreased, or unchanged in order from top to bottom, so as to filter out the desired reception of the optical sensing pixel array 240.
  • the apertures of the third light-blocking layer 260 of the upper layer are larger than those of the first light-blocking layer 220 of the middle layer.
  • the aperture, the aperture of the opening in the first light blocking layer 220 of the intermediate layer is larger than the aperture of the opening in the second light blocking layer 230 of the lower layer.
  • the above description respectively takes the fingerprint detection unit 20 including two or three light blocking layers as an example for description.
  • the fingerprint detection unit 20 may also include more light blocking layers, or the fingerprint detection
  • the unit 20 may also include only one light blocking layer, and the embodiment of the present application is not limited to this.
  • a plurality of inclined through holes may be provided on the light-blocking layer, that is, multiple light guide channels of any microlens may be the light blocking layer.
  • the thickness of the one light-blocking layer is greater than the preset threshold, so that the multiple optical sensing pixels arranged under each microlens are used to receive the convergence through the same microlens or through the multiple adjacent microlenses. The optical signal transmitted through the corresponding optical channel.
  • the fingerprint detection unit 20 of the embodiment of the present application may further include a transparent medium layer 250.
  • the transparent medium layer 250 may be disposed at at least one of the following positions: between the microlens array 210 and the at least one light blocking layer, the at least one light blocking layer Between the layers, and between the at least one light blocking layer and the optical sensing pixel array 240.
  • the transparent medium layer 250 may include a first medium layer 251 located between the microlens array 210 and the at least one light blocking layer (ie, the first light blocking layer 220), and The second dielectric layer 252 between the first light blocking layer 220 and the second light blocking layer 230.
  • the transparent medium layer 250 may include: a first medium layer 251 and three layers located between the microlens array 210 and the at least one light blocking layer (that is, the third light blocking layer 260).
  • the second dielectric layer 252 between 220 and the second light blocking layer 230 may include: a first medium layer 251 and three layers located between the microlens array 210 and the at least one light blocking layer (that is, the third light blocking layer 260).
  • the material of the transparent medium layer 250 is any transparent material that is transparent to light, such as glass, which can also be transitioned by air or vacuum, which is not specifically limited in this application.
  • the fingerprint detection unit 20 of the embodiment of the present application may further include a filter layer.
  • FIG. 8 is another schematic structural diagram of the fingerprint detection unit 20 according to an embodiment of the present application.
  • the fingerprint detection unit 20 may further include a filter layer 270, which may be arranged in the following position At least one place: above the microlens array 210, between the microlens array 210 and the at least one light blocking layer; between the at least one light blocking layer; and between the at least one light blocking layer and the optical sensing pixel array 240 between.
  • the filter layer 270 may be disposed between the optical sensing pixel array 240 and the second light blocking layer 230.
  • the filter layer 270 may be the filter layer in the optical component 132 mentioned above.
  • the filter layer 270 can be used to reduce undesired ambient light in fingerprint sensing, so as to improve the optical sensing of the optical sensing pixel array 240 to the received light.
  • the filter layer 270 may specifically be used to filter out light of a specific wavelength, for example, near-infrared light and part of red light. For example, human fingers absorb most of the energy of light with a wavelength below 580nm. If one or more optical filters or optical filter layers are designed to filter light with wavelengths from 580nm to infrared, it can greatly reduce the impact of ambient light on fingerprints. The influence of optical detection in induction.
  • the filter layer 270 may include one or more optical filters, and the one or more optical filters may be configured as, for example, band-pass filters to allow transmission of light emitted by the OLED screen while blocking infrared light in sunlight. And other light components. When the fingerprint detection unit 20 is used outdoors, this kind of optical filtering can effectively reduce the background light caused by sunlight.
  • One or more optical filters may be implemented as, for example, an optical filter coating formed on one or more continuous interfaces, or may be implemented as one or more discrete interfaces. It should be understood that the filter layer 270 can be formed at any position along the optical path from the reflected light formed by the reflection of the finger to the optical sensing pixel array 240, which is not specifically limited in the embodiment of the present application.
  • the light entrance surface of the filter layer 270 may be provided with an optical inorganic coating or an organic blackened coating, so that the reflectance of the light entrance surface of the filter layer 270 is lower than a first threshold, such as 1%, so as to ensure The optical sensing pixel array 240 can receive enough light signals to improve the fingerprint recognition effect.
  • the filter layer 270 fixed on the upper surface of the optical sensing pixel array 240 by a fixing device as an example.
  • the filter layer 270 and the optical sensing pixel array 240 can be glued and fixed in the non-sensitive area of the optical sensing pixel array 240, and there is a gap between the filter layer 270 and the photosensitive area of the optical sensing pixel array 240.
  • the lower surface of the filter layer 270 is fixed to the upper surface of the optical sensing pixel array 240 by glue with a refractive index lower than a predetermined refractive index.
  • the predetermined refractive index includes but is not limited to 1.3.
  • the fingerprint detection device of the embodiment of the present application includes multiple fingerprint detection units, and each fingerprint detection unit is set based on the above technical solution, which can at least solve the following technical problems: 1.
  • the recognition effect of the vertical light signal on dry fingers is too poor Problems; 2.
  • the long exposure time of the single-object telecentric microlens array solution 3.
  • the thickness of the fingerprint detection device is too large; 4.
  • the tolerance tolerance of the fingerprint detection device is too poor; 5.
  • Fingerprint detection The size of the device is too large.
  • the multiple optical sensing pixels under each microlens can respectively receive the oblique light signal from the same microlens or multiple adjacent microlenses and transmitted through the corresponding light guide channel. So as to realize the use of oblique light signal to detect fingerprint information of dry fingers. When the dry hand fingerprint is not in contact with the OLED screen, the contrast between the fingerprint ridge and the fingerprint valley of the fingerprint image in the vertical direction is poor, and the image is blurred to the point where the fingerprint lines cannot be distinguished.
  • This application uses a reasonable optical path design to allow the optical path to receive light signals in oblique directions , While it can better obtain normal finger fingerprints, it can better detect dry finger fingerprint images.
  • the fingers In normal life scenarios, such as washing hands, getting up in the morning, plastering fingers, low temperature and other scenes, the fingers are usually dry, and the stratum corneum is uneven. When it is pressed on the OLED screen, local areas of the fingers will have poor contact. The occurrence of this situation causes the current optical fingerprint solution to have a poor effect on dry hand fingerprint recognition.
  • the beneficial effect of this application is to improve the dry hand fingerprint imaging effect and make the dry hand fingerprint image clearer.
  • the optical sensing pixel array 240 can also expand the field of view and the field of view of the optical sensing pixel array 240 by receiving the oblique light signal.
  • the field of view of the fingerprint detection unit 20 capable of receiving oblique light can be expanded from 6x9mm 2 to 7.5x10.5mm 2 , further enhance the fingerprint recognition effect.
  • a plurality of optical sensing pixels are arranged under each microlens, so that the spatial period of the lens array 210 and the spatial period of the optical sensing pixel array 240 are not equal, thereby avoiding moiré fringes in the fingerprint image and improving the fingerprint recognition effect.
  • Aiming at problem 2 by designing multiple light guide channels for each microlens, and each light guide channel corresponds to an optical sensor pixel to receive the light signal passing through the light guide channel, that is, a single microlens and multiple optics can be formed
  • the imaging light path with sensor pixel matching That is, a single microlens can multiplex the optical signals of multiple angles (for example, as shown in Figure 5 or Figure 6, the optical signals of 4 angles can be multiplexed by a single microlens), so that different object apertures can be multiplexed.
  • the angled beam is divided and imaged, which effectively increases the light input of each fingerprint detection unit, which also increases the light input of the fingerprint detection device, thereby reducing the exposure time of the optical sensor pixel array.
  • the aperture angle is the angle formed by the object point on the optical axis of the microlens and the effective diameter of the front lens of the microlens.
  • the effective diameter of the lens is proportional and inversely proportional to the distance of the focal point.
  • the optical sensing pixel array can be divided into multiple optical sensing pixels according to the direction of the light guide channel.
  • the sensing pixel group where each optical sensing pixel in each optical sensing pixel group is used to receive oblique light signals whose direction is the same as the direction of the light guide channel corresponding to the same optical sensing pixel group, that is, each optical sensing pixel group can be based on
  • the received oblique light signal generates a fingerprint image, so the multiple optical sensing pixel groups can be used to generate multiple fingerprint images.
  • the multiple fingerprint images can be superimposed to obtain one fingerprint image.
  • the high-resolution fingerprint image is then used for fingerprint recognition based on this high-resolution fingerprint image.
  • the optical sensing pixel array 240 can respectively converge oblique light signals to the four optical sensing pixels through the four light guide channels corresponding to each microlens, that is, the optical sensing pixel array 240 can be divided into The 4 optical sensor pixel groups are used to form 4 fingerprint images. Based on these 4 fingerprint images, a fingerprint image with higher resolution can be obtained, thereby improving the fingerprint recognition effect.
  • each microlens can converge oblique light signals in multiple directions through multiple light guide channels, or the optical sensor pixel array can simultaneously acquire multiple fingerprint images through the optical path design, even if the optical sensor pixel is reduced
  • the exposure time of the array results in a lower resolution of each fingerprint image. It is also possible to process multiple fingerprint images with lower resolution to obtain a fingerprint image with higher resolution.
  • the fingerprint recognition effect can be guaranteed while reducing the exposure time of the optical sensing pixel array 240 (ie, the image sensor).
  • the imaging light path of a single microlens and multiple optical sensing pixels can perform non-frontal light imaging (ie oblique light imaging) of the object beam of the fingerprint under the screen, especially the multiple set under each microlens
  • the optical sensing pixels are respectively used to receive the light signals converged by a plurality of adjacent microlenses, thereby being able to enlarge the object-side numerical aperture of the optical system and shorten the optical path design of the optical sensing pixel array (that is, the at least one light blocking layer)
  • the thickness of each fingerprint detection unit can be effectively reduced, which reduces the thickness of the fingerprint detection device.
  • the imaging light path with a single microlens and multiple optical sensing pixels can perform non-frontal light imaging of the object beam of the fingerprint under the screen, which can expand the object numerical aperture of the optical system and improve the robustness of the system And the tolerance tolerance of the fingerprint detection unit 20.
  • the numerical aperture may be the product of the refractive index (h) of the medium between the front lens of the micro lens and the object to be inspected and the sine of the half of the aperture angle (u).
  • the optical sensor can be improved without affecting the two adjacent optical sensing pixels.
  • the density of the optical sensing pixels in the sensing pixel array 240 can further reduce the size of each fingerprint detection unit, which also reduces the size of the fingerprint detection device.
  • the technical solution of the present application can make the optical sensing pixel array 240 only receive the light signal of the oblique angle through a reasonable design of the multiple light guide channels corresponding to each microlens, and converge multiple angles through a single microlens.
  • the oblique light signal solves the problem of too long exposure time for the single-object telecentric microlens array scheme.
  • the fingerprint detection unit 20 can not only solve the problem of poor recognition of dry fingers by the vertical light signal and the long exposure time of the single-object telecentric microlens array solution, but also solve the problem of multiple fingerprint detections.
  • the fingerprint detection device of the unit is too thick, tolerance tolerance is too poor, and size is too large.
  • the fingerprint detection device includes multiple fingerprint detection units, and each fingerprint detection unit can receive multiple oblique lights in different directions.
  • each fingerprint detection unit 20 shown in FIGS. 3 to 8 can receive four
  • the inclination angle of each direction can be the same or different.
  • FIG. 9 shows a schematic diagram of the field of view of a single fingerprint detection unit.
  • the electronic device includes a display screen 310.
  • the bottom of the display screen 310 includes a single fingerprint detection unit.
  • the fingerprint detection unit 20 in FIG. 3 to FIG. 8 can receive light in four different oblique directions. As shown in FIG.
  • the size of the upper surface of the fingerprint detection unit (or the field of view of the fingerprint detection unit) will be smaller than the fingerprint detection area 311 above the display screen 310.
  • the area of the effective area that is, the size of the entire fingerprint detection unit relative to the field of view of the fingerprint detection area 311 on the display screen 310 will expand the field of view by ⁇ L from the edge of the fingerprint detection unit.
  • the fingerprint detection area 311 included in the display screen 310 is used to provide a touch interface for the user to perform fingerprint identification, and its effective area can also be referred to as the field of view of the fingerprint detection unit in the fingerprint detection area 311, or the fingerprint detection area
  • the field of view of 311 refers to the effective touch range when a finger touches for fingerprint recognition. It should be understood that the expanded field of view is proportional to the distance between the upper surface of the screen and the upper surface of the fingerprint detection unit.
  • FIG. 10 shows a schematic diagram of the method of calculating the field of view of a single fingerprint detection unit according to an embodiment of the present application.
  • the size of the entire fingerprint detection unit 20 is relative to the fingerprint detection area on the display screen 310.
  • the field of view of 311 will extend the field of view of ⁇ L to the edge of the fingerprint detection unit.
  • the ⁇ L can be calculated by the following formula (1):
  • the gap is air
  • the ⁇ 2 is the deflection angle of the light propagating in the air.
  • the angle of each direction in the air is 40°
  • the display screen 310 is an OLED screen with a thickness of 1.4 mm.
  • this size can be the size of a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) light sensitive area
  • CMOS complementary Metal Oxide Semiconductor
  • the effective area of the optical fingerprint under the screen is greater than or equal to the effective field of view of 6mmx6mm, and its recognition effect is better, that is, the effective area of the fingerprint detection area 311 included in the display screen 310 is usually greater than or Equal to 6mmx6mm, the fingerprint detection area 311 is used to provide a touch interface for the user to perform fingerprint identification.
  • an embodiment of the present application provides a fingerprint detection device, which realizes a larger field of view by physically splicing multiple fingerprint detection units.
  • the fingerprint detection apparatus of the embodiment of the present application includes multiple fingerprint detection units.
  • FIG. 11 shows a schematic diagram of the electronic device 300 of the embodiment of the present application. As shown in FIG. 11, the electronic device 300 includes a display screen 310. The display screen 310 includes a fingerprint detection area 311 for providing a touch interface for the user to perform fingerprint identification. A fingerprint detection device is provided under the display screen 310. The fingerprint detection device includes multiple fingerprint detection units, for example, the multiple fingerprint detection units Any one of the fingerprint detection units may be the aforementioned fingerprint detection unit 20.
  • the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to a size parameter, and the size parameter includes at least one of the following parameters:
  • the field of view of the fingerprint detection unit that is, the total area including the field of view that the fingerprint detection unit can expand
  • the area of the fingerprint detection area the thickness of the display screen
  • the optical path surface of each fingerprint detection unit to the display The distance from the top surface of the screen.
  • the structures or sizes of the multiple fingerprint detection units included in the fingerprint detection device in the embodiment of the present application may be the same or different.
  • any one of the plurality of fingerprint detection units may be the fingerprint detection unit 20 of FIG. 3 to FIG. 8, but the plurality of fingerprint detection units may be fingerprint detection units with the same or different structures, and also It can be fingerprint detection units with the same size or different sizes.
  • the structures and sizes of the multiple fingerprint detection units can be set to be completely the same.
  • the multiple fingerprint detection units can all be the fingerprint detection unit 20 shown in FIG. 3 or FIG. The application embodiment is not limited to this.
  • the multiple fingerprint detection units included in the fingerprint detection device may be arranged in an n*m matrix, and n and m are positive integers.
  • the plurality of fingerprint detection units in the same row of the plurality of fingerprint detection units have the same separation distance; and/or, the plurality of fingerprint detection units in the same column of the plurality of fingerprint detection units have the same separation distance.
  • the number of multiple fingerprint detection units included in the fingerprint detection device may be two.
  • the two fingerprint detection units can be arranged side by side on the left and right, and can also be arranged side by side up and down.
  • FIG. 12 shows a schematic diagram of the arrangement of two fingerprint detection units in an embodiment of the present application. As shown in FIG. 12, it is assumed here that two rectangular fingerprint detection units are arranged side by side, where each fingerprint detection unit may be the fingerprint detection unit 20 shown in FIGS. 3 to 8 above.
  • the width of the fingerprint detection unit is represented as W
  • the length is represented as H
  • the horizontal distance between the two fingerprint detection units is represented as G.
  • the two fingerprint detection units in Figure 12 The outer rectangular box may indicate the effective range of the fingerprint detection area, which is larger than the area of the fingerprint detection unit.
  • the actual area of the fingerprint detection area may be larger than its effective range, and the effective range represents the smallest area that can be used for fingerprint recognition.
  • other functional areas may also be provided in the fingerprint detection area. Not limited to this.
  • the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least a first value X (that is, ⁇ L is greater than or equal to the first value X).
  • Value X the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, then referring to FIG. 12, the following parameters can be set accordingly:
  • the length H of each fingerprint detection unit is greater than or equal to Y-2X
  • the width W of each fingerprint detection unit is greater than or equal to 0.5Z-2X
  • the horizontal distance G between the two fingerprint detection units is less than or equal to 2X.
  • the size parameters include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.75mm (that is, ⁇ L is greater than or equal to 0.75mm), and the fingerprint detection If the area of the region is greater than or equal to 6mm*6mm, then referring to Figure 12, the following parameters can be set accordingly: the length H of each fingerprint detection unit is greater than or equal to 4.5mm, and the width W of each fingerprint detection unit is greater than or equal to 1.5mm, The horizontal distance G between the two fingerprint detection units is less than or equal to 1.5 mm.
  • each fingerprint detection unit is set to 6mm
  • the width W of each fingerprint detection unit is set to 2.3mm
  • the horizontal distance G between the two fingerprint detection units is set to 1mm
  • the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.6mm outside the edge of each fingerprint detection unit (that is, ⁇ L is greater than or equal to 0.6mm), and the fingerprint The area of the detection area is greater than or equal to 6mm*6mm, then referring to Figure 12, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit is greater than or equal to 4.8mm, and the width W of each fingerprint detection unit is greater than or equal to 1.8mm , The horizontal distance G between the two fingerprint detection units is less than or equal to 1.2 mm.
  • each fingerprint detection unit is set to 6.5mm
  • the width W of each fingerprint detection unit is set to 2.6mm
  • the horizontal distance G between the two fingerprint detection units is set to 1mm, then according to the above parameter settings,
  • the effective field of view or effective area of the corresponding fingerprint recognition area is 7.4mm*7.7mm.
  • the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3mm outside the edge of each fingerprint detection unit (that is, ⁇ L is greater than or equal to 0.3mm), and the fingerprint The area of the detection area is greater than or equal to 6mm*6mm, then referring to Figure 12, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit is greater than or equal to 5.4mm, and the width W of each fingerprint detection unit is greater than or equal to 2.4mm , The horizontal distance G between the two fingerprint detection units is less than or equal to 0.6 mm.
  • the extended distance ⁇ L of the field of view of each fingerprint detection unit on the upper surface of the display screen relative to the edge of each fingerprint detection unit can be determined by the parameters h 1 , h 2 , ⁇ according to formula (1) 1 and ⁇ 2 are determined, and the range of ⁇ L can be set according to actual applications.
  • the above-mentioned 0.6mm or 0.75mm can be set, or it can be set to a larger or smaller value.
  • ⁇ L is usually set It is greater than or equal to 0.3mm.
  • ⁇ L can reach 0.6mm, or up to 0.75mm; for another example, suppose that the vertical distance h 1 +h 2 from the optical path surface of each fingerprint detection unit to the upper surface of the display screen is 1.6 mm, and the deflection angle ⁇ 2 of the light propagating in the air If it is 20°, it is possible to make ⁇ L reach 0.6mm.
  • the three parameters of W, G, and H are set reasonably to meet the requirements of the effective area of the fingerprint detection area. Cost-effective under-screen optical fingerprint recognition solution.
  • the data output by the areas of the two fingerprint detection units can be spliced together through the entire field of view through digital image processing algorithms, and then fingerprint identification can be performed.
  • the number of the plurality of fingerprint detection units included in the fingerprint detection device may also be four.
  • the four fingerprint detection units can be arranged in a variety of ways.
  • the four fingerprint detection units can be arranged in a row or a column, or the four fingerprint detection units can also be arranged in a 2*2 matrix.
  • Fig. 13 shows a schematic diagram of the arrangement of four fingerprint detection units in an embodiment of the present application. As shown in FIG. 13, it is assumed that four rectangular fingerprint detection units are arranged in a 2*2 matrix, where each fingerprint detection unit may be the fingerprint detection unit 20 shown in FIGS. 3 to 8 above.
  • each fingerprint detection unit is represented as H
  • the width of each fingerprint detection unit is represented as W
  • the horizontal distance between two adjacent fingerprint detection units in the horizontal direction Denoted as G1
  • the vertical distance between two adjacent fingerprint detection units in the vertical direction is denoted as G2.
  • the rectangular boxes on the periphery of the four fingerprint detection units in FIG. 13 can indicate the effective range of the fingerprint detection area, which is larger than the total area of the fingerprint detection units.
  • the actual area of the fingerprint detection area may be larger than its effective range, and the effective range represents the smallest area that can be used for fingerprint recognition.
  • other functional areas may also be provided in the fingerprint detection area. Not limited to this.
  • the W, H, G1, and G2 can be set appropriately.
  • the size can make it meet the requirements of the effective area size of the fingerprint detection area. For example, it can be determined based on the expansion distance of the field of view of each fingerprint detection unit on the upper surface of the display screen relative to the edge of each fingerprint detection unit, and the minimum effective area of the fingerprint detection area in the display screen. The size and distance of each fingerprint detection unit can meet the requirements of fingerprint detection area.
  • the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least a first value X (that is, ⁇ L is greater than or equal to the first value X). Value X), and the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, then referring to FIG.
  • each fingerprint detection unit is greater than or equal to 0.5Y-2X
  • the width W of each fingerprint detection unit is greater than or equal to 0.5Z-2X
  • the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction Less than or equal to 2X
  • the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is less than or equal to 2X.
  • the size parameters of the embodiment of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.75mm outside the edge of each fingerprint detection unit (that is, ⁇ L is greater than or equal to 0.75mm ), and the area of the fingerprint detection area is greater than or equal to 6mm*6mm, then referring to Figure 13, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit can be set to be greater than or equal to 1.5mm, and each fingerprint detection unit The width W can be set to be greater than or equal to 1.5mm, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction can be set to be less than or equal to 1.5mm, and the two adjacent fingerprint detection units in the vertical direction The vertical distance G2 between them can be set to be less than or equal to 1.5 mm.
  • the length H of each fingerprint detection unit can be set to 2.3mm
  • the width W of each fingerprint detection unit is set to 2.3mm
  • the distance between two adjacent fingerprint detection units in the horizontal direction The horizontal distance G1 is set to 1.2mm
  • the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is set to 1.2mm.
  • the size parameters of the embodiment of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.6mm outside the edge of each fingerprint detection unit (that is, ⁇ L is greater than or equal to 0.6mm ), and the area of the fingerprint detection area is greater than or equal to 6mm*6mm, then referring to Figure 13, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit can be set to be greater than or equal to 1.8mm, and each fingerprint detection unit The width W can be set to be greater than or equal to 1.8mm, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction can be set to be less than or equal to 1.2mm, and the two adjacent fingerprint detection units in the vertical direction The vertical distance G2 between them can be set to be less than or equal to 1.2 mm.
  • FIG. 14 shows a schematic diagram of the size of the four fingerprint detection units according to an embodiment of the present application.
  • the field of view of each fingerprint detection unit on the upper surface of the display screen is When the edge of the unit is expanded to 0.6mm, the length H of each fingerprint detection unit can be set to 2.6mm, the width W of each fingerprint detection unit is set to 2.6mm, and the two adjacent fingerprints in the horizontal direction
  • the horizontal distance G1 between the detection units is set to 1mm
  • the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is set to 1mm.
  • the size parameters of the embodiment of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3mm outside the edge of each fingerprint detection unit (that is, ⁇ L is greater than or equal to 0.3mm ), and the area of the fingerprint detection area is greater than or equal to 6mm*6mm, then referring to Figure 13, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit can be set to be greater than or equal to 2.4mm, and each fingerprint detection unit The width W can be set to be greater than or equal to 2.4mm, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction can be set to be less than or equal to 0.6mm, and the two adjacent fingerprint detection units in the vertical direction The vertical distance G2 between them can be set to be less than or equal to 0.6 mm.
  • ⁇ L can be determined by the parameters h 1 , h 2 , ⁇ 1 and ⁇ 2 according to formula (1), and the range of ⁇ L can be set according to actual applications, for example, the above 0.6 mm or 0.75 mm can be set, Or it can be set to a larger or smaller value.
  • ⁇ L is usually set to be greater than or equal to 0.3 mm. For the sake of brevity, it will not be repeated here.
  • the fingerprint detection device can include two or four fingerprint detection units by means of splicing. On this basis, other numbers of fingerprint detection units can be provided, for example, more than 4 fingerprint detection units can be provided.
  • the fingerprint detection unit of the present application is not limited to this.
  • the stitching scheme of the fingerprint detection unit can be done on a single CMOS imaging chip, or multiple small-area fingerprint detection unit optical path architecture CMOS imaging chips can be used for stitching. Both can achieve low cost and large scale. Field of view area, optical fingerprint under ultra-thin screen.
  • the data output by each fingerprint detection unit can be processed by a digital image reconstruction algorithm. Specifically, the image data of the sensing area of each fingerprint detection unit in the same direction is shifted by specific pixels to obtain the clearest image of the area; images of the same corresponding area of different fingerprint detection units can be spliced by moving specific pixels , Get the clearest image.
  • interpolation can be used to compensate for the problem of different image data sampling in non-overlapping regions.
  • the area of the multiple fingerprint detection units in the fingerprint identification device of the embodiment of the application is smaller, the amount of data obtained is less, and the software resource consumption is more small.
  • the spacing between the AA regions of each fingerprint detection unit can be used for layout wiring, or can also be used for placement of driving circuits and control circuits of CMOS sensitive unit pixels, which can further reduce the chip area.
  • the method of processing images by the optical sensor pixel array included in a fingerprint detection unit is taken as an example for description.
  • Each of the multiple fingerprint detection units included in the fingerprint detection device can perform image processing in the same manner. .
  • a fingerprint detection unit it includes an optical sensing pixel array, the optical sensing pixel array includes a plurality of optical sensing pixels, the plurality of optical sensing pixels are divided into multiple groups of optical sensing pixels, the same group of optical sensing pixels is used for The light signals in the same direction are received, that is, the light guide channels through which the light signals received by the same group of optical sensing pixels pass are in the same direction.
  • the optical sensing pixel array is divided into multiple groups of optical sensing pixels, and the multiple sets of optical sensing pixels are used to receive light signals in multiple directions to obtain multiple images, and the multiple images are used to detect fingerprint information of a finger.
  • each fingerprint detection unit can directly output the multiple images, or can also reconstruct the multiple images into one image, and the reconstructed image can be used for fingerprint recognition.
  • a set of optical sensing pixels in the plurality of sets of optical sensing pixels are used to receive a light signal in one of the plurality of directions to obtain one of the plurality of images.
  • the optical sensing pixel array in the fingerprint detection unit can receive light in four directions in total, that is, the fingerprint detection unit includes light guide channels in four directions
  • the optical sensing pixel array can be divided into There are four sets of optical sensing pixels, where the first set of optical sensing pixels are used to receive light signals in the first direction.
  • the first set of optical sensing pixels may include the optical sensing pixels included in the upper left corner of FIG.
  • a set of electrical signals, the first set of electrical signals is used to form the first image; and so on, the second set of optical sensing pixels are used to receive optical signals in the second direction
  • the second set of optical sensing pixels may include The optical sensing pixels included in the upper right corner are converted into a second set of electrical signals, and the second set of electrical signals are used to form a second image; the third set of optical sensing pixels are used to receive light signals in a third direction, such as the third
  • the group of optical sensing pixels may include the optical sensing pixels included in the lower left corner of FIG. 5, and converted into a third group of electrical signals.
  • the third group of electrical signals is used to form a third image, and the fourth group of optical sensing pixels is used to receive the fourth group.
  • Directional optical signals, for example, the fourth group of optical sensing pixels may include the optical sensing pixels included in the lower right corner of FIG. 5, and converted into a fourth group of electrical signals, which are used to form a fourth image.
  • the number of pixels in each group of the plurality of groups of optical sensing pixels may be equal or unequal; if the number of the plurality of groups of optical sensing pixels is equal, the same arrangement can be adopted.
  • the same arrangement can be adopted. For example, as shown in FIG. 5, assuming that the bottom of each microlens is like the second microlens 212, there are four optical sensing pixels distributed correspondingly, then when the optical sensing pixel array is grouped, the upper left of each microlens can be The optical sensing pixels of the same group are divided into the same group. The optical sensing pixels of the same group receive the same direction of light signals; similarly, they can be divided into four groups in total. The number of optical sensing pixels included in the four groups of optical sensing pixels is all The same, and the arrangement is also the same, they are all located at the upper left corner of the corresponding micro lens.
  • optical sensing pixel array is divided into multiple groups of optical sensing pixels, and each optical sensing pixel in each group of optical sensing pixels may correspond to one pixel in an image, that is, each optical sensing pixel array Each optical sensor pixel corresponds to only one pixel point, so the correspondingly generated image is clearer and the relative calculation amount is relatively large.
  • multiple optical sensing pixels may also generate one pixel point. For example, assuming that the number of optical sensing pixels included in multiple groups of optical sensing pixels is the same, a preset number of optical sensing pixels in a continuous position in a group of optical sensing pixels can be corresponding to output one pixel point, which can greatly reduce Calculation amount.
  • the multiple optical sensing pixels in the same group of optical sensing pixels that output the same pixel may not be adjacent in position, that is, for any continuous multiple optical sensing pixels used to output the same pixel
  • the direction of the light signal received by each optical sensing pixel is different, that is, the position between any two optical sensing pixels in the continuous plurality of optical sensing pixels cannot exist the following optical sensing pixel: the light received by the optical sensing pixel
  • the direction of the signal is the same as the direction of the light signal received by the consecutive plurality of optical sensing pixels.
  • one or more optical sensing pixels that are continuous with the third optical sensing pixel 243 may include: one or more microlenses adjacent to the second microlens 212 (for example, as shown in FIG.
  • the upper left corner of each microlens corresponds to the optical sensing pixel; at the same time, one or more optical sensing pixels continuous with the third optical sensing pixel 243 will not include:
  • the third optical sensing pixel 243 and one or more continuous optical sensing pixels may be used to jointly output a pixel point.
  • each fingerprint detection unit can output one or more images. For example, if the multiple fingerprint detection units finally output one fingerprint image, the multiple images can be combined. For fingerprint detection. Or, if each fingerprint detection unit in multiple fingerprint detection units outputs multiple images, for example, multiple images correspond to light signals in multiple directions, the fingerprints with the same light signal in all images output by the multiple fingerprint detection units can be The images are merged, for example, the image data in the same direction of the sensing area of each fingerprint detection unit is shifted by a specific pixel to obtain the clearest image of the area; the images of the same corresponding area of different fingerprint detection units can be specified Pixel stitches the image together to get the clearest image.
  • the fingerprint detection device of the embodiment of the present application can also be used to distinguish true and false fingerprints in 2D and 3D. Since each fingerprint detection unit can receive images in multiple directions, for example, it can receive images in four directions.
  • each fingerprint detection unit can receive images in multiple directions, for example, it can receive images in four directions.
  • the light intensity received by the lower sensor is the largest; when the reflected linearly polarized light is perpendicular to the direction of the linear polarizer on the mobile phone screen, the light received by the lower sensor is the weakest. That is, when the 3D fingerprint is pressed on the upper surface of the OLED screen, the original image data of the electron beam eye and the linear polarizer of the mobile phone screen are different, but the difference between the 2D fingerprint is not obvious. Therefore, by distinguishing the difference of the original data of light from different directions, it is possible to distinguish 2D fake fingerprints and 3D fingerprints to a certain extent.
  • the fingerprint detection device of the embodiment of the present application includes multiple fingerprint detection units.
  • multiple fingerprint detection units By properly splicing the multiple fingerprint detection units, a large field of view and oblique light reception can be realized, thereby reducing the actual chip area and the chip Cost, reduce software resource consumption, and can also improve the imaging effect of dry hand fingerprints.
  • the embodiment of the present application also provides an electronic device, which may include a display screen and the fingerprint detection device of the above-mentioned embodiment of the application, wherein the fingerprint detection device is arranged under the display screen to realize under-screen optical Fingerprint detection.
  • the electronic device can be any electronic device with a display screen.
  • the display screen may be the display screen described above, such as an OLED display screen or other display screens.
  • OLED display screen or other display screens.
  • the electronic device may further include at least one processor configured to process data output by a plurality of fingerprint detection units.
  • the electronic device can receive the image data output by each fingerprint detection unit through a processor.
  • it can receive the data of each fingerprint detection unit through a serial peripheral interface (SPI), and combine the Data from multiple fingerprint detection units are processed.
  • the electronic device can also receive the image data output by each fingerprint detection unit through the SPI interfaces of multiple processors, and after each processor performs the processing separately, the combined processing is performed by one of the processors.
  • SPI serial peripheral interface
  • the implementation of this application Examples are not limited to this.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .

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Abstract

A fingerprint detection apparatus and an electronic device, the fingerprint detection apparatus being suitable for below a display screen comprising a fingerprint detection zone, and the fingerprint detection apparatus comprising: multiple fingerprint detection units (20), the size of each fingerprint detection unit and the distance between adjacent fingerprint detection units being determined according to relevant size parameters of each fingerprint detection unit or of the fingerprint detection zone; each fingerprint detection unit comprises from top to bottom: a micro lens array (210); at least one light blocking layer to form multiple inclined light guide channels corresponding to each micro-lens; an optical sensing pixel array (240), each optical sensing pixel respectively being used for receiving an optical signal aggregated by the micro lens and transmitted by means of the corresponding light guide channel so as to detect fingerprint information of a finger. The fingerprint detection apparatus and the electronic device are capable of using a smaller chip area to implement the same valid fingerprint identification field of view, thereby reducing costs.

Description

指纹检测装置和电子设备Fingerprint detection device and electronic equipment
本申请要求于2019年7月12日提交中国专利局、申请号为PCT/CN2019/095880、申请名称为“指纹检测装置和电子设备”的PCT专利申请，2019年8月2日提交中国专利局、申请号为PCT/CN2019/099135、申请名称为“指纹检测装置和电子设备”的PCT专利申请，以及2019年8月23日提交中国专利局、申请号为PCT/CN2019/102366、申请名称为“指纹检测装置、方法和电子设备”的PCT专利申请的优先权，其全部内容通过引用结合在本申请中。This application requires a PCT patent application filed with the Chinese Patent Office with the application number PCT/CN2019/095880 and the application name "Fingerprint Detection Device and Electronic Equipment" on July 12, 2019, and submitted to the Chinese Patent Office on August 2, 2019 , The application number is PCT/CN2019/099135, the application name is "fingerprint detection device and electronic equipment" PCT patent application, and it was submitted to the Chinese Patent Office on August 23, 2019, the application number is PCT/CN2019/102366, the application name is The priority of the PCT patent application for "Fingerprint Detection Apparatus, Method and Electronic Equipment", the entire content of which is incorporated in this application by reference.
技术领域Technical field
本申请涉及生物识别领域，尤其涉及指纹检测装置和电子设备。This application relates to the field of biometrics, and in particular to fingerprint detection devices and electronic equipment.
背景技术Background technique
随着手机行业的高速发展，生物识别技术越来越受到人们重视，更加便捷、低成本的屏下指纹识别技术实用化成为大众所需。屏下光学指纹识别技术是将光学指纹模组设置于显示屏下，通过采集光学指纹图像，实现指纹识别。随着终端产品的发展，对指纹识别性能、尺寸以及成本的要求越来越高。With the rapid development of the mobile phone industry, people pay more and more attention to biometric technology, and the practical application of more convenient and low-cost fingerprint recognition technology under the screen has become a popular demand. The under-screen optical fingerprint recognition technology is to install the optical fingerprint module under the display screen, and realize fingerprint recognition by collecting the optical fingerprint image. With the development of terminal products, the requirements for fingerprint recognition performance, size and cost are getting higher and higher.
例如，某些场景中会出现的干手指问题，干手指和显示屏的接触面积非常小，识别响应面积非常小，导致采集的指纹不连续，特征点容易丢失，影响了指纹识别的性能。另外，在解决上述如何提升指纹识别的性能的问题的同时，还需考虑指纹识别装置应用于屏下这一特殊场景时的成本以及尺寸等问题。For example, in some scenarios, the dry finger problem occurs. The contact area between the dry finger and the display screen is very small, and the recognition response area is very small, resulting in discontinuous fingerprints and easy loss of feature points, which affects the performance of fingerprint recognition. In addition, while solving the above-mentioned problem of how to improve the performance of fingerprint recognition, it is also necessary to consider the cost and size of the fingerprint recognition device when it is applied to the special scene of the screen.
发明内容Summary of the invention
本申请提供了一种的指纹检测装置和电子设备，能够用更小的芯片面积实现同样的指纹有效识别视场，从而减小了芯片面积并降低了成本。The present application provides a fingerprint detection device and electronic equipment, which can use a smaller chip area to achieve the same effective fingerprint identification field of view, thereby reducing the chip area and reducing the cost.
第一方面，提供了一种指纹检测装置，该指纹检测装置适用于显示屏的下方以实现屏下光学指纹检测，所述显示屏包括指纹检测区域，所述指纹检测区域用于手指触摸以进行指纹检测，所述指纹检测装置包括：多个指纹检测单元，所述多个指纹检测单元中每个指纹检测单元的尺寸以及相邻两个指纹检测单元之间的距离为根据尺寸参数设置的，所述尺寸参数包括以下参数 中的至少一个：所述每个指纹检测单元的视场范围、所述指纹检测区域的面积、所述显示屏的厚度以及所述每个指纹检测单元的光路上表面至所述显示屏的下表面的距离。In a first aspect, a fingerprint detection device is provided, which is suitable for under a display screen to realize under-screen optical fingerprint detection, the display screen includes a fingerprint detection area, and the fingerprint detection area is used for finger touch to perform Fingerprint detection, the fingerprint detection device includes: a plurality of fingerprint detection units, the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to size parameters, The size parameter includes at least one of the following parameters: the field of view range of each fingerprint detection unit, the area of the fingerprint detection area, the thickness of the display screen, and the optical path surface of each fingerprint detection unit The distance to the bottom surface of the display screen.
其中，所述每个指纹检测单元包括：微透镜阵列，用于设置在所述显示屏的下方，且包括多个微透镜；至少一个挡光层，设置在所述微透镜阵列的下方，且形成有所述多个微透镜中的每个微透镜对应的多个导光通道，所述每个微透镜对应的多个导光通道中每个导光通道与所述每个微透镜的光轴之间的夹角小于90°；光学感应像素阵列，设置在所述至少一个挡光层的下方，且包括多个光学感应像素，所述每个微透镜对应的多个导光通道中的每个导光通道的下方设置有一个光学感应像素，所述一个光学感应像素用于接收经由微透镜汇聚并通过对应的导光通道传输的光信号，所述光信号用于检测手指的指纹信息。Wherein, each fingerprint detection unit includes: a microlens array, which is arranged under the display screen and includes a plurality of microlenses; at least one light blocking layer is arranged under the microlens array, and A plurality of light guide channels corresponding to each of the plurality of microlenses are formed, and each light guide channel of the plurality of light guide channels corresponding to each microlens corresponds to the light of each microlens. The angle between the axes is less than 90°; the optical sensing pixel array is arranged below the at least one light blocking layer and includes a plurality of optical sensing pixels, and each microlens corresponding to the plurality of light guide channels An optical sensing pixel is provided under each light guide channel, and the one optical sensing pixel is used to receive the optical signal converged by the microlens and transmitted through the corresponding light guide channel, and the optical signal is used to detect fingerprint information of the finger .
因此，本申请实施例的包括多个指纹检测单元的指纹检测装置，能够解决以下问题：1、垂直光信号对干手指的识别效果过差的问题；2、单物方远心微透镜阵列方案曝光时间过长的问题；3、指纹检测装置的厚度过大的问题；4、指纹检测装置的公差容忍度过差的问题；5、指纹检测装置尺寸过大的问题；6、指纹检测装置成本过高的问题。Therefore, the fingerprint detection device including multiple fingerprint detection units of the embodiment of the present application can solve the following problems: 1. The problem of poor recognition effect of the vertical light signal on dry fingers; 2. The single-object telecentric microlens array solution The problem of too long exposure time; 3. The thickness of the fingerprint detection device is too large; 4. The tolerance of the fingerprint detection device is too poor; 5. The problem of the fingerprint detection device is too large; 6. The cost of the fingerprint detection device The problem is too high.
结合第一方面，在第一方面的一种实现方式中，所述多个指纹检测单元的尺寸相同。With reference to the first aspect, in an implementation of the first aspect, the sizes of the multiple fingerprint detection units are the same.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多个指纹检测单元中位于同一行的多个指纹检测单元的间隔距离相等；和/或，所述多个指纹检测单元中位于同一列的多个指纹检测单元的间隔距离相等。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the plurality of fingerprint detection units located in the same row of the plurality of fingerprint detection units are separated by the same distance; and/or, The multiple fingerprint detection units located in the same column among the multiple fingerprint detection units have the same separation distance.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多个指纹检测单元的个数为两个。With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the number of the plurality of fingerprint detection units is two.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，两个指纹检测单元左右并排设置。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, two fingerprint detection units are arranged side by side.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，在所述尺寸参数包括：所述每个指纹检测单元在显示屏的上表面的视场范围为所述每个指纹检测单元的边沿外扩至少第一值X、以及所述指纹检测区域的长度大于或者等于第二值Y、以及所述指纹检测区域的宽度大于或者等于第 三值Z的情况下，所述每个指纹检测单元的长度大于或者等于Y-2X，所述每个指纹检测单元的宽度大于或者等于0.5Z-2X，所述两个指纹检测单元之间的水平距离小于或者等于2X。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the size parameter includes: the field of view range of each fingerprint detection unit on the upper surface of the display screen is When the edges of each fingerprint detection unit are expanded by at least a first value X, the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, The length of each fingerprint detection unit is greater than or equal to Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance between the two fingerprint detection units is less than or equal to 2X.
例如，在所述尺寸参数包括：所述每个指纹检测单元在显示屏的上表面的视场范围为所述每个指纹检测单元的边沿外扩至少0.3mm、以及所述指纹检测区域的面积大于或者等于6mm*6mm的情况下，所述每个指纹检测单元的长度大于或者等于5.4mm，所述每个指纹检测单元的宽度大于或者等于2.4mm，所述两个指纹检测单元之间的水平距离小于或者等于0.6mm。For example, the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3 mm outside the edge of each fingerprint detection unit, and the area of the fingerprint detection area In the case of greater than or equal to 6mm*6mm, the length of each fingerprint detection unit is greater than or equal to 5.4mm, the width of each fingerprint detection unit is greater than or equal to 2.4mm, and the distance between the two fingerprint detection units The horizontal distance is less than or equal to 0.6mm.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个指纹检测单元的长度为6mm，所述每个指纹检测单元的宽度为2.3mm，所述两个指纹检测单元之间的水平距离为1mm。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 6 mm, the width of each fingerprint detection unit is 2.3 mm, and the two The horizontal distance between the fingerprint detection units is 1mm.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个指纹检测单元的长度为6.5mm，所述每个指纹检测单元的宽度为2.6mm，所述两个指纹检测单元之间的水平距离为1mm。Combining the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 6.5 mm, the width of each fingerprint detection unit is 2.6 mm, and the The horizontal distance between the two fingerprint detection units is 1mm.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多个指纹检测单元的个数为四个。With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the number of the plurality of fingerprint detection units is four.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，四个指纹检测单元按照2*2的矩阵排列。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the four fingerprint detection units are arranged in a 2*2 matrix.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，在所述尺寸参数包括：所述每个指纹检测单元在显示屏的上表面的视场范围为所述每个指纹检测单元的边沿外扩至少第一值X、以及所述指纹检测区域的长度大于或者等于第二值Y、以及所述指纹检测区域的宽度大于或者等于第三值Z的情况下，所述每个指纹检测单元的长度大于或者等于0.5Y-2X，所述每个指纹检测单元的宽度大于或者等于0.5Z-2X，水平方向上相邻的两个指纹检测单元之间的水平距离小于或者等于2X，竖直方向上相邻的两个指纹检测单元之间的竖直距离小于或者等于2X。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the size parameter includes: the field of view range of each fingerprint detection unit on the upper surface of the display screen is When the edges of each fingerprint detection unit are expanded by at least a first value X, the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, The length of each fingerprint detection unit is greater than or equal to 0.5Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance between two adjacent fingerprint detection units in the horizontal direction is less than Or equal to 2X, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is less than or equal to 2X.
例如，在所述尺寸参数包括：所述每个指纹检测单元在显示屏的上表面的视场范围为所述每个指纹检测单元的边沿外扩至少0.3mm、以及所述指纹检测区域的面积大于或者等于6mm*6mm的情况下，所述每个指纹检测单元的长度大于或者等于2.4mm，所述每个指纹检测单元的宽度大于或者等于2.4mm，水平方向上相邻的两个指纹检测单元之间的水平距离小于或者等于 0.6mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离小于或者等于0.6mm。For example, the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3 mm outside the edge of each fingerprint detection unit, and the area of the fingerprint detection area In the case of greater than or equal to 6mm*6mm, the length of each fingerprint detection unit is greater than or equal to 2.4mm, the width of each fingerprint detection unit is greater than or equal to 2.4mm, and two adjacent fingerprints in the horizontal direction are detected The horizontal distance between the units is less than or equal to 0.6 mm, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is less than or equal to 0.6 mm.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个指纹检测单元的长度为2.3mm，所述每个指纹检测单元的宽度为2.3mm，水平方向上相邻的两个指纹检测单元之间的水平距离为1.2mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离为1.2mm。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 2.3 mm, the width of each fingerprint detection unit is 2.3 mm, and the horizontal direction The horizontal distance between two adjacent fingerprint detection units above is 1.2 mm, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is 1.2 mm.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个指纹检测单元的长度为2.6mm，所述每个指纹检测单元的宽度为2.6mm，水平方向上相邻的两个指纹检测单元之间的水平距离为1mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离为1mm。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the length of each fingerprint detection unit is 2.6 mm, the width of each fingerprint detection unit is 2.6 mm, and the horizontal direction The horizontal distance between two adjacent fingerprint detection units above is 1 mm, and the vertical distance between two adjacent fingerprint detection units in the vertical direction is 1 mm.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个微透镜对应的多个导光通道的底部分别延伸至相邻的多个微透镜的下方。With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the bottoms of the multiple light guide channels corresponding to each microlens respectively extend below the adjacent multiple microlenses.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个微透镜对应的多个导光通道的底部位于同一个微透镜的下方。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the bottoms of the multiple light guide channels corresponding to each microlens are located under the same microlens.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个微透镜对应的多个导光通道沿同一微透镜的光轴方向中心对称分布。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the multiple light guide channels corresponding to each microlens are centrally symmetrically distributed along the optical axis direction of the same microlens.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个微透镜对应的多个导光通道中的每个导光通道和第一平面形成预设夹角，以使所述每个微透镜下方设置的多个光学感应像素分别用于接收经由一个或者多个微透镜汇聚的并通过对应的导光通道传输的光信号，其中，所述第一平面为与所述显示屏平行的平面。Combining the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, each of the plurality of light guide channels corresponding to each microlens and the first plane form a preset clip Angle, so that the multiple optical sensing pixels arranged under each microlens are respectively used to receive the optical signals converged by one or more microlenses and transmitted through the corresponding light guide channel, wherein the first plane Is a plane parallel to the display screen.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述预设夹角的范围为15度至60度。With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the preset included angle ranges from 15 degrees to 60 degrees.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个微透镜对应的多个导光通道在所述第一平面的投影相对同一微透镜的光轴在所述第一平面的投影中心对称分布。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the projection of the multiple light guide channels corresponding to each microlens on the first plane is relative to the optical axis of the same microlens Symmetrically distributed at the projection center of the first plane.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述光学感应像素阵列包括多组光学感应像素，所述多组光学感应像素中同一组光学感应像素接收的光信号所经过的导光通道的方向相同，所述多组光学感应像素用于接收多个方向的光信号以得到多张图像，所述多张图像用于检 测手指的指纹信息。Combining the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the optical sensing pixel array includes multiple sets of optical sensing pixels, and the optical sensing pixels in the multiple sets of optical sensing pixels receive The directions of the light guide channels through which the light signals pass are the same, the multiple groups of optical sensing pixels are used to receive light signals in multiple directions to obtain multiple images, and the multiple images are used to detect fingerprint information of a finger.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多组光学感应像素中的一组光学感应像素用于接收所述多个方向中一个方向的光信号得到所述多张图像中的一张图像。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, a set of optical sensing pixels in the plurality of sets of optical sensing pixels are used to receive light signals in one of the multiple directions Obtain one of the plurality of images.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多组像素中每组像素的像素数量相等，且排列方式相同。With reference to the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the number of pixels in each group of pixels in the plurality of groups of pixels is equal, and the arrangement manner is the same.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多组光学感应像素中的一组光学感应像素中一个光学感应像素对应一张图像中的一个像素点。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, one optical sensing pixel in a set of optical sensing pixels in the plurality of sets of optical sensing pixels corresponds to a pixel in an image .
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多组光学感应像素中的一组光学感应像素中连续的多个光学感应像素对应一张图像中的一个像素点。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, consecutive multiple optical sensing pixels in a set of optical sensing pixels in the plurality of sets of optical sensing pixels correspond to One pixel.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个微透镜下方的多个光学感应像素的分布呈多边形。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the distribution of the plurality of optical sensing pixels under each microlens is polygonal.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多边形为矩形或菱形。With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the polygon is a rectangle or a rhombus.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述至少一个挡光层为多个挡光层，不同挡光层中设置有所述每个微透镜对应的至少一个开孔，以形成所述每个微透镜对应的多个导光通道。Combining the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the at least one light-blocking layer is a plurality of light-blocking layers, and the different light-blocking layers are provided with each corresponding microlens At least one opening of the microlens to form a plurality of light guide channels corresponding to each microlens.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，不同挡光层中的与同一微透镜对应的开孔的数量由上至下依次增大。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the number of openings corresponding to the same microlens in different light blocking layers increases sequentially from top to bottom.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，不同挡光层中的与同一微透镜对应的开孔的孔径由上至下依次减小。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the apertures of the openings in different light blocking layers corresponding to the same microlens are sequentially reduced from top to bottom.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多个挡光层中的底层挡光层中设置有所述每个微透镜对应的多个开孔，所述每个微透镜对应的多个导光通道分别穿过所述底层挡光层中的同一微透镜对应的多个开孔。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, a plurality of openings corresponding to each microlens are provided in the bottom light-blocking layer of the plurality of light-blocking layers The multiple light guide channels corresponding to each microlens respectively pass through multiple openings corresponding to the same microlens in the bottom light blocking layer.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多个挡光层中的非底层挡光层在所述多个微透镜中相邻的两个微透镜的后焦点的中间位置设置有开孔，所述相邻的两个微透镜对应的两个导光通道均穿过所述非底层挡光层中的所述相邻的两个微透镜对应的开孔，以使所述 每个微透镜对应的多个导光通道的底部分别延伸至相邻的多个微透镜的下方。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the non-underlying light-blocking layer of the plurality of light-blocking layers is in the two adjacent microlenses of the plurality of microlenses. The middle position of the back focus of the lens is provided with an opening, and the two light guide channels corresponding to the two adjacent microlenses both pass through the two adjacent microlenses in the non-bottom light blocking layer. The openings of each microlens corresponding to the plurality of light guide channels respectively extend below the adjacent plurality of microlenses.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述多个挡光层中的顶层挡光层在所述每个微透镜的光轴上设置有开孔，所述每个微透镜对应的多个导光通道均穿过所述顶层挡光层中同一微透镜对应的开孔。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the top light-blocking layer of the plurality of light-blocking layers is provided with an opening on the optical axis of each microlens The multiple light guide channels corresponding to each microlens pass through the corresponding openings of the same microlens in the top light blocking layer.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述至少一个挡光层仅包括一个挡光层，所述多个导光通道为所述一个挡光层中的同一微透镜对应的多个倾斜通孔。With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the at least one light blocking layer includes only one light blocking layer, and the multiple light guide channels are the one light blocking layer Multiple oblique through holes corresponding to the same micro lens in.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述一个挡光层的厚度大于预设阈值，以使所述每个微透镜下方设置的多个光学感应像素分别用于接收经由一个或者多个微透镜汇聚的并通过对应的导光通道传输的光信号。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, the thickness of the one light blocking layer is greater than a preset threshold, so that the multiple optical sensors provided under each microlens The pixels are respectively used to receive the optical signals converged through one or more microlenses and transmitted through the corresponding light guide channels.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个指纹检测单元还包括：透明介质层，设置在以下位置中的至少一处：In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, each fingerprint detection unit further includes: a transparent medium layer disposed at at least one of the following positions:
所述微透镜阵列和所述至少一个挡光层之间，所述至少一个挡光层之间，以及所述至少一个挡光层和所述光学感应像素阵列。Between the microlens array and the at least one light blocking layer, between the at least one light blocking layer, and between the at least one light blocking layer and the optical sensing pixel array.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述至少一层挡光层和所述微透镜阵列集成设置，或所述至少一层挡光层和所述光学感应像素阵列集成设置。With reference to the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the at least one light-blocking layer and the microlens array are integrated, or the at least one light-blocking layer and the The optical sensor pixel array is integrated.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个微透镜满足以下条件中的至少一项：所述微透镜的聚光面在与其光轴垂直的平面上的投影为矩形或圆形；所述微透镜的聚光面为非球面；所述微透镜的聚光面的各个方向上的曲率相同；所述微透镜包括至少一片透镜；以及所述微透镜的焦距范围为10um-2mm。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, each microlens satisfies at least one of the following conditions: the condensing surface of the microlens is perpendicular to its optical axis The projection on the plane of the microlens is rectangular or circular; the condensing surface of the microlens is an aspheric surface; the curvature of the condensing surface of the microlens is the same in all directions; the microlens includes at least one lens; and The focal length range of the microlens is 10um-2mm.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述微透镜阵列满足以下条件的至少一项：所述微透镜阵列呈多边形排列，以及所述微透镜阵列的占空比的范围为100％-50％。Combining the first aspect and the foregoing implementation manners thereof, in another implementation manner of the first aspect, the microlens array satisfies at least one of the following conditions: the microlens array is arranged in a polygonal shape, and the microlens array The range of duty cycle is 100%-50%.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述微透镜阵列的周期与所述光学感应像素阵列的周期不相等，且所述微透镜阵列的周期是所述光学感应像素阵列的周期的有理数倍。In combination with the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the period of the microlens array is not equal to the period of the optical sensing pixel array, and the period of the microlens array is The period of the optical sensing pixel array is a rational multiple of the period.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述指纹检测装置与所述显示屏之间的距离为20um-3000um。With reference to the first aspect and the foregoing implementation manners, in another implementation manner of the first aspect, the distance between the fingerprint detection device and the display screen is 20um-3000um.
结合第一方面及其上述实现方式，在第一方面的另一种实现方式中，所述每个指纹检测单元还包括：滤光层，设置在以下位置中的至少一处：所述微透镜阵列的上方，以及所述微透镜阵列与所述光学感应像素阵列之间。In combination with the first aspect and the foregoing implementation manners of the first aspect, in another implementation manner of the first aspect, each fingerprint detection unit further includes: a filter layer disposed at at least one of the following positions: the microlens Above the array and between the micro lens array and the optical sensing pixel array.
第二方面，提供了一种电子设备，包括：显示屏；以及根据上述第一方面或者第一方面的任意可能的实现方式中的指纹检测装置。In a second aspect, an electronic device is provided, including: a display screen; and a fingerprint detection device according to the first aspect or any possible implementation of the first aspect.
结合第二方面，在第二方面的一种实现方式中，所述显示屏包括指纹检测区域，所述指纹检测区域用于为手指提供触摸界面。With reference to the second aspect, in an implementation of the second aspect, the display screen includes a fingerprint detection area, and the fingerprint detection area is used to provide a touch interface for a finger.
附图说明Description of the drawings
图1是本申请实施例的电子设备的示意性正视图。Fig. 1 is a schematic front view of an electronic device according to an embodiment of the present application.
图2是本申请实施例的图1中的电子设备的剖面示意图。2 is a schematic cross-sectional view of the electronic device in FIG. 1 according to an embodiment of the present application.
图3是本申请实施例的指纹检测装置中一个指纹检测单元的主视图。Fig. 3 is a front view of a fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
图4是本申请实施例的指纹检测装置中另一个指纹检测单元的主视图。Fig. 4 is a front view of another fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
图5是本申请实施例的指纹检测单元中任意微透镜与其对应的光学感应像素的示意性俯视图。5 is a schematic top view of any microlens and its corresponding optical sensing pixel in the fingerprint detection unit of the embodiment of the present application.
图6是本申请实施例的指纹检测单元中任意微透镜与其对应的光学感应像素的另一示意性俯视图。6 is another schematic top view of any microlens and its corresponding optical sensing pixel in the fingerprint detection unit of the embodiment of the present application.
图7是本申请实施例的指纹检测装置中另一个指纹检测单元的主视图。Fig. 7 is a front view of another fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
图8是本申请实施例的指纹检测装置中另一个指纹检测单元的主视图。Fig. 8 is a front view of another fingerprint detection unit in the fingerprint detection device of the embodiment of the present application.
图9是本申请实施例的具有单个指纹检测单元的指纹检测装置的视场的示意图。FIG. 9 is a schematic diagram of the field of view of the fingerprint detection device with a single fingerprint detection unit according to an embodiment of the present application.
图10是本申请实施例的具有单个指纹检测单元的指纹检测装置的视场的计算方式的示意图。FIG. 10 is a schematic diagram of a calculation method of the field of view of a fingerprint detection device with a single fingerprint detection unit according to an embodiment of the present application.
图11是本申请实施例的具有多个指纹检测单元的指纹检测装置的视场的示意图。FIG. 11 is a schematic diagram of the field of view of the fingerprint detection device with multiple fingerprint detection units according to an embodiment of the present application.
图12是本申请实施例的两个指纹检测单元的排列方式的示意性正视图。Fig. 12 is a schematic front view of the arrangement of two fingerprint detection units according to an embodiment of the present application.
图13是本申请实施例的四个指纹检测单元的排列方式的示意性正视图。Fig. 13 is a schematic front view of the arrangement of four fingerprint detection units according to an embodiment of the present application.
图14是本申请实施例的四个指纹检测单元的排列方式的示意性侧视图。Fig. 14 is a schematic side view of the arrangement of four fingerprint detection units according to an embodiment of the present application.
具体实施方式Detailed ways
下面将结合附图，对本申请实施例中的技术方案进行描述。The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings.
本申请实施例的技术方案可以应用于各种电子设备。例如，智能手机、笔记本电脑、平板电脑、游戏设备等便携式或移动计算设备，以及电子数据库、汽车、银行自动柜员机(Automated Teller Machine，ATM)等其他电子设备。但本申请实施例对此并不限定。The technical solutions of the embodiments of the present application can be applied to various electronic devices. For example, portable or mobile computing devices such as smartphones, notebook computers, tablet computers, and gaming devices, as well as other electronic devices such as electronic databases, automobiles, and bank automated teller machines (ATM). However, the embodiments of the present application are not limited thereto.
本申请实施例的技术方案可以用于生物特征识别技术。其中，生物特征识别技术包括但不限于指纹识别、掌纹识别、虹膜识别、人脸识别以及活体识别等识别技术。为了便于说明，下文以指纹识别技术为例进行说明。The technical solutions of the embodiments of the present application can be used in biometric identification technology. Among them, the biometric recognition technology includes but is not limited to fingerprint recognition, palmprint recognition, iris recognition, face recognition, and living body recognition. For ease of description, the following uses fingerprint recognition technology as an example.
本申请实施例的技术方案可以用于屏下指纹识别技术和屏内指纹识别技术。The technical solutions of the embodiments of the present application can be used for off-screen fingerprint identification technology and in-screen fingerprint identification technology.
屏下指纹识别技术是指将指纹识别模组安装在显示屏下方，从而实现在显示屏的显示区域内进行指纹识别操作，不需要在电子设备正面除显示区域外的区域设置指纹采集区域。具体地，指纹识别模组使用从电子设备的显示组件的顶面返回的光来进行指纹感应和其他感应操作。这种返回的光携带与显示组件的顶面接触或者接近的物体(例如手指)的信息，位于显示组件下方的指纹识别模组通过采集和检测这种返回的光以实现屏下指纹识别。其中，指纹识别模组的设计可以为通过恰当地配置用于采集和检测返回的光的光学元件来实现期望的光学成像，从而检测出手指的指纹信息。The under-screen fingerprint recognition technology refers to the installation of the fingerprint recognition module below the display screen, so as to realize the fingerprint recognition operation in the display area of the display screen. There is no need to set a fingerprint collection area on the front of the electronic device except for the display area. Specifically, the fingerprint recognition module uses the light returned from the top surface of the display assembly of the electronic device to perform fingerprint sensing and other sensing operations. This returned light carries information about objects (such as fingers) that are in contact with or close to the top surface of the display assembly. The fingerprint recognition module located under the display assembly collects and detects this returned light to realize fingerprint recognition under the screen. Among them, the design of the fingerprint recognition module can be to realize the desired optical imaging by appropriately configuring the optical elements for collecting and detecting the returned light, so as to detect the fingerprint information of the finger.
相应的，屏内(In-display)指纹识别技术是指将指纹识别模组或者部分指纹识别模组安装在显示屏内部，从而实现在显示屏的显示区域内进行指纹识别操作，不需要在电子设备正面除显示区域外的区域设置指纹采集区域。Correspondingly, in-display fingerprint recognition technology refers to the installation of fingerprint recognition modules or part of fingerprint recognition modules inside the display screen, so as to realize fingerprint recognition operations in the display area of the display screen without the need for electronic The fingerprint collection area is set on the front of the device except the display area.
图1至图2示出了本申请实施例可以适用的电子设备的示意图。其中，图1为电子设备10的正视图，图2为图1所示的电子设备10的剖面示意图。Figures 1 to 2 show schematic diagrams of electronic devices to which the embodiments of the present application can be applied. 1 is a front view of the electronic device 10, and FIG. 2 is a schematic cross-sectional view of the electronic device 10 shown in FIG.
如图1和图2所示，电子设备10可以包括显示屏120和光学指纹识别模组130。As shown in FIGS. 1 and 2, the electronic device 10 may include a display screen 120 and an optical fingerprint recognition module 130.
显示屏120可以为自发光显示屏，其采用具有自发光的显示单元作为显示像素。比如显示屏120可以为有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏或者微型发光二极管(Micro-LED)显示屏。在其他可替代实施例中，显示屏120也可以为液晶显示屏(Liquid Crystal Display，LCD)或者其他被动发光显示屏，本申请实施例对此不做限制。进一步地， 显示屏120还可以具体为触控显示屏，其不仅可以进行画面显示，还可以检测用户的触摸或者按压操作，从而为用户提供一个人机交互界面。比如，在一种实施例中，电子设备10可以包括触摸传感器，该触摸传感器可以具体为触控面板(Touch Panel，TP)，其可以设置在显示屏120表面，也可以部分集成或者整体集成到该显示屏120内部，从而形成触控显示屏。The display screen 120 may be a self-luminous display, which uses a self-luminous display unit as display pixels. For example, the display screen 120 may be an Organic Light-Emitting Diode (OLED) display screen or a Micro-LED (Micro-LED) display screen. In other alternative embodiments, the display screen 120 may also be a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display, which is not limited in the embodiment of the present application. Further, the display screen 120 may also be specifically a touch display screen, which can not only perform screen display, but also detect a user's touch or press operation, thereby providing a user with a human-computer interaction interface. For example, in an embodiment, the electronic device 10 may include a touch sensor. The touch sensor may specifically be a touch panel (TP), which may be provided on the surface of the display screen 120, or may be partially integrated or integrated into Inside the display screen 120, a touch-sensitive display screen is formed.
光学指纹模组130包括光学指纹传感器，该光学指纹传感器包括具有多个光学感应单元131(也可以称为光学感应像素、感光像素、像素单元等)的感应阵列133。该感应阵列133所在区域或者其感应区域为该光学指纹模组130对应的指纹检测区域103(也称为指纹采集区域、指纹识别区域等)。The optical fingerprint module 130 includes an optical fingerprint sensor, and the optical fingerprint sensor includes a sensing array 133 having a plurality of optical sensing units 131 (also may be referred to as optical sensing pixels, photosensitive pixels, pixel units, etc.). The area where the sensing array 133 is located or its sensing area is the fingerprint detection area 103 corresponding to the optical fingerprint module 130 (also referred to as fingerprint collection area, fingerprint recognition area, etc.).
其中，该光学指纹模组130设置在该显示屏120下方的局部区域。Wherein, the optical fingerprint module 130 is arranged in a partial area below the display screen 120.
如图1所示，该指纹检测区域103可以位于该显示屏120的显示区域之中。在一种可替代实施例中，该光学指纹模组130还可以设置在其他位置，比如该显示屏120的侧面或者该电子设备10的边缘非透光区域，并通过光路设计来将来自该显示屏120的至少部分显示区域的光信号导引到该光学指纹模组130，从而使得该指纹检测区域103实际上位于该显示屏120的显示区域。As shown in FIG. 1, the fingerprint detection area 103 may be located in the display area of the display screen 120. In an alternative embodiment, the optical fingerprint module 130 can also be arranged in other positions, such as the side of the display screen 120 or the non-transparent area of the edge of the electronic device 10, and the optical fingerprint module 130 can be designed to remove The optical signal of at least a part of the display area of the screen 120 is guided to the optical fingerprint module 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
针对电子设备10，用户在需要对该电子设备10进行解锁或者其他指纹验证的时候，只需要将手指按压在位于显示屏120的指纹检测区域103，便可以实现指纹输入。由于指纹检测可以在屏内实现，因此采用上述结构的电子设备10无需其正面专门预留空间来设置指纹按键(比如Home键)，从而可以采用全面屏方案，即该显示屏120的显示区域可以基本扩展到整个电子设备10的正面。Regarding the electronic device 10, when the user needs to unlock the electronic device 10 or perform other fingerprint verification, he only needs to press his finger on the fingerprint detection area 103 located on the display screen 120 to implement fingerprint input. Since fingerprint detection can be implemented in the screen, the electronic device 10 adopting the above structure does not need to reserve space on the front side to set fingerprint buttons (such as the Home button), so that a full screen solution can be adopted, that is, the display area of the display screen 120 can be It basically extends to the front of the entire electronic device 10.
如图2所示，光学指纹模组130可以包括光检测部分134和光学组件132。该光检测部分134包括感应阵列133(也可称为光学指纹传感器)以及与该感应阵列133电性连接的读取电路及其他辅助电路，其可以在通过半导体工艺制作在一个芯片(Die)上，比如光学成像芯片或者光学指纹传感器。该感应阵列133具体为光探测器(Photo detector)阵列，其包括多个呈阵列式分布的光探测器，该光探测器可以作为上述的光学感应单元。该光学组件132可以设置在该光检测部分134的感应阵列133的上方，其可以具体包括滤光层(Filter)、导光层或光路引导结构、以及其他光学元件，该滤光层可以用于滤除穿透手指的环境光，而该导光层或光路引导结构主要用于从手指 表面反射回来的反射光导引至该感应阵列133进行光学检测。As shown in FIG. 2, the optical fingerprint module 130 may include a light detecting part 134 and an optical component 132. The light detection part 134 includes a sensor array 133 (also called an optical fingerprint sensor) and a reading circuit and other auxiliary circuits electrically connected to the sensor array 133, which can be fabricated on a chip (Die) by a semiconductor process , Such as optical imaging chip or optical fingerprint sensor. The sensing array 133 is specifically a photodetector (photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetector can be used as the aforementioned optical sensing unit. The optical component 132 may be disposed above the sensing array 133 of the light detection part 134, and it may specifically include a filter layer (Filter), a light guide layer or a light path guiding structure, and other optical elements. The filter layer may be used for The ambient light penetrating the finger is filtered out, and the light guide layer or light path guiding structure is mainly used to guide the reflected light reflected from the surface of the finger to the sensing array 133 for optical detection.
在本申请的一些实施例中，光学组件132可以与光检测部分134封装在同一个光学指纹部件。比如该光学组件132可以与该光学检测部分134封装在同一个光学指纹芯片，也可以将该光学组件132设置在该光检测部分134所在的芯片外部，比如将该光学组件132贴合在该芯片上方，或者将该光学组件132的部分元件集成在上述芯片之中。In some embodiments of the present application, the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component. For example, the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the light detection part 134 is located, for example, the optical component 132 can be attached to the chip. Above, or some components of the optical assembly 132 are integrated into the above-mentioned chip.
在本申请的一些实施例中，该光学指纹模组130的感应阵列133的所在区域或者光感应范围对应该光学指纹模组130的指纹检测区域103。其中，该光学指纹模组130的指纹采集区域103可以等于或不等于该光学指纹模组130的感应阵列133的所在区域的面积或者光感应范围，本申请实施例对此不做具体限定。In some embodiments of the present application, the area or light sensing range of the sensing array 133 of the optical fingerprint module 130 corresponds to the fingerprint detection area 103 of the optical fingerprint module 130. The fingerprint collection area 103 of the optical fingerprint module 130 may be equal to or not equal to the area or light sensing range of the sensing array 133 of the optical fingerprint module 130, which is not specifically limited in the embodiment of the present application.
例如，通过光线准直方式进行光路引导，该光学指纹模组130的指纹检测区域103可以设计成与该光学指纹模组130的感应阵列的面积基本一致。For example, the light path is guided by light collimation, the fingerprint detection area 103 of the optical fingerprint module 130 can be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130.
又例如，例如通过例如透镜成像的光路设计、反射式折叠光路设计或者其他光线汇聚或者反射等光路设计，可以使得该光学指纹模组130的指纹检测区域103的面积大于该光学指纹模组130的感应阵列133的面积。For another example, for example, through optical path design such as lens imaging, reflective folding optical path design, or other light convergence or reflection, the area of the fingerprint detection area 103 of the optical fingerprint module 130 can be larger than that of the optical fingerprint module 130. The area of the sensing array 133.
下面对光学组件132可以包括的光路引导结构进行示例性说明。The light path guiding structure that the optical assembly 132 may include is exemplified below.
以该光路引导结构包括具有高深宽比的通孔阵列的光学准直器为例，该光学准直器可以具体为在半导体硅片制作而成的准直器(Collimator)层，其具有多个准直单元或者微孔，该准直单元可以具体为小孔，从手指反射回来的反射光中，垂直入射到该准直单元的光线可以穿过并被其下方的传感器芯片接收，而入射角度过大的光线在该准直单元内部经过多次反射被衰减掉，因此每一个传感器芯片基本只能接收到其正上方的指纹纹路反射回来的反射光，能够有效提高图像分辨率，进而提高指纹识别效果。Taking an optical collimator having a through hole array with a high aspect ratio in the optical path guiding structure as an example, the optical collimator may be specifically a collimator (Collimator) layer fabricated on a semiconductor silicon wafer, which has multiple A collimating unit or a micro-hole, the collimating unit can be specifically a small hole. Among the reflected light reflected from the finger, the light that is perpendicularly incident on the collimating unit can pass through and be received by the sensor chip below it, and the incident angle Excessive light is attenuated by multiple reflections inside the collimating unit, so each sensor chip can basically only receive the reflected light reflected by the fingerprint lines directly above it, which can effectively improve the image resolution and thereby improve the fingerprint Recognition effect.
以该光路引导结构包括光学镜头的光路设计为例，该光路引导结构可以为光学透镜(Lens)层，其具有一个或多个透镜单元，比如一个或多个非球面透镜组成的透镜组，其用于将从手指反射回来的反射光汇聚到其下方的光检测部分134的感应阵列133，以使得该感应阵列133可以基于该反射光进行成像，从而得到该手指的指纹图像。进一步地，该光学透镜层在该透镜单元的光路中还可以形成有针孔或者微孔光阑，比如，在该透镜单元的光路中可以形成有一个或者多个遮光片，其中至少一个遮光片可以在该透镜单元的 光轴或者光学中心区域形成有透光微孔，该透光微孔可以作为上述针孔或者微孔光阑。该针孔或者微孔光阑可以配合该光学透镜层和/或该光学透镜层上方的其他光学膜层，扩大光学指纹模组130的视场，以提高该光学指纹模组130的指纹成像效果。Taking the light path design of the light path guiding structure including an optical lens as an example, the light path guiding structure may be an optical lens (Lens) layer, which has one or more lens units, such as a lens group composed of one or more aspheric lenses, which The sensor array 133 of the light detecting part 134 is used to converge the reflected light reflected from the finger to the sensor array 133 of the light detection part 134 below, so that the sensor array 133 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger. Further, the optical lens layer may also have a pinhole or a micro-aperture formed in the optical path of the lens unit, for example, one or more light-shielding sheets may be formed in the light path of the lens unit, of which at least one light-shielding sheet A light-transmitting micro-hole may be formed in the optical axis or optical center area of the lens unit, and the light-transmitting micro-hole may be used as the aforementioned pinhole or micro-aperture. The pinhole or micro-aperture diaphragm can cooperate with the optical lens layer and/or other optical film layers above the optical lens layer to expand the field of view of the optical fingerprint module 130 to improve the fingerprint imaging effect of the optical fingerprint module 130 .
以该光路引导结构包括微透镜(Micro-Lens)层的光路设计为例，该光路引导结构可以为包括由多个微透镜形成的微透镜阵列，其可以通过半导体生长工艺或者其他工艺形成在该光检测部分134的感应阵列133上方，并且每一个微透镜可以分别对应于该感应阵列133的其中一个感应单元。并且该微透镜层和该感应单元之间还可以形成其他光学膜层，比如介质层或者钝化层。更具体地，该微透镜层和该感应单元之间还可以包括具有微孔(或称为开孔)的挡光层(或称为遮光层、阻光层等)，其中该微孔形成在其对应的微透镜和感应单元之间，该挡光层可以阻挡相邻微透镜和感应单元之间的光学干扰，并使得该感应单元所对应的光线通过该微透镜汇聚到该微孔内部并经由该微孔传输到该感应单元以进行光学指纹成像。Taking the light path design of the light path guiding structure including a micro-lens layer as an example, the light path guiding structure may include a micro lens array formed by a plurality of micro lenses, which may be formed in the light path through a semiconductor growth process or other processes. The light detecting part 134 is above the sensing array 133, and each microlens can correspond to one of the sensing units of the sensing array 133, respectively. In addition, other optical film layers may be formed between the microlens layer and the sensing unit, such as a dielectric layer or a passivation layer. More specifically, the microlens layer and the sensing unit may also include a light blocking layer (or called a light blocking layer, a light blocking layer, etc.) with micro holes (or called openings), wherein the micro holes are formed in Between the corresponding micro lens and the sensing unit, the light blocking layer can block the optical interference between the adjacent micro lens and the sensing unit, and make the light corresponding to the sensing unit converge into the micro hole through the micro lens and It is transmitted to the sensing unit through the microhole for optical fingerprint imaging.
应理解，上述针对光路引导结构的几种实现方案可以单独使用也可以相互结合使用。It should be understood that the foregoing several implementation solutions for the optical path guiding structure can be used alone or in combination with each other.
例如，可以在该准直器层或者该光学透镜层的上方或下方进一步设置微透镜层。当然，在该准直器层或者该光学透镜层与该微透镜层结合使用时，其具体叠层结构或者光路可能需要按照实际需要进行调整。For example, a micro lens layer may be further provided above or below the collimator layer or the optical lens layer. Of course, when the collimator layer or the optical lens layer is used in combination with the microlens layer, the specific laminated structure or optical path may need to be adjusted according to actual needs.
另一方面，该光学组件132还可以包括其他光学元件，比如滤光层(Filter)或其他光学膜片，其可以设置在该光路引导结构和该光学指纹传感器之间或者设置在该显示屏120与该光路引导结构之间，主要用于隔离外界干扰光对光学指纹检测的影响。其中，该滤光层可以用于滤除穿透手指并经过该显示屏120进入该光学指纹传感器的环境光，与该光路引导结构相类似，该滤光层可以针对每个光学指纹传感器分别设置以滤除干扰光，或者也可以采用一个大面积的滤光层同时覆盖该多个光学指纹传感器。On the other hand, the optical component 132 may also include other optical elements, such as a filter or other optical films, which may be arranged between the optical path guiding structure and the optical fingerprint sensor or on the display screen 120. Between it and the optical path guiding structure, it is mainly used to isolate the influence of external interference light on optical fingerprint detection. Wherein, the filter layer can be used to filter out the ambient light that penetrates the finger and enters the optical fingerprint sensor through the display screen 120. Similar to the optical path guiding structure, the filter layer can be separately provided for each optical fingerprint sensor. In order to filter out the interference light, a large-area filter layer can also be used to simultaneously cover the multiple optical fingerprint sensors.
指纹识别模组140可以用于采集用户的指纹信息(比如指纹图像信息)。The fingerprint identification module 140 can be used to collect user fingerprint information (such as fingerprint image information).
以显示屏120采用具有自发光显示单元的显示屏为例，比如有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏或者微型发光二极管(Micro-LED)显示屏。该光学指纹模组130可以利用该OLED显示屏120位于指纹检测区域103的显示单元(即OLED光源)作为光学指纹检测的激 励光源。当手指140按压在该指纹检测区域103时，显示屏120向该指纹检测区域103上方的目标手指140发出一束光111，该光111在手指140的表面发生反射形成反射光或者经过该手指140内部散射而形成散射光(透射光)。Take the display screen 120 with a self-luminous display unit as an example, such as an organic light-emitting diode (OLED) display or a micro-LED (Micro-LED) display. The optical fingerprint module 130 can use the display unit (that is, the OLED light source) of the OLED display 120 located in the fingerprint detection area 103 as an excitation light source for optical fingerprint detection. When the finger 140 is pressed on the fingerprint detection area 103, the display screen 120 emits a beam of light 111 to the target finger 140 above the fingerprint detection area 103. The light 111 is reflected on the surface of the finger 140 to form reflected light or passes through the finger 140. Internal scattering forms scattered light (transmitted light).
在本申请实施例中，为便于描述，将上述反射光和散射光统称为返回光。由于指纹的脊(ridge)141与谷(valley)142对于光的反射能力不同，因此，来自指纹脊的反射光151和来自指纹谷的反射光152具有不同的光强，反射光经过光学组件132后，被光学指纹模组130中的感应阵列133所接收并转换为相应的电信号，即指纹检测信号；基于该指纹检测信号便可以获得指纹图像数据，并且可以进一步进行指纹匹配验证，从而在电子设备10实现光学指纹识别功能。In the embodiments of the present application, for ease of description, the above-mentioned reflected light and scattered light are collectively referred to as return light. Because the ridge 141 and valley 142 of the fingerprint have different light reflection capabilities, the reflected light 151 from the fingerprint ridge and the reflected light 152 from the fingerprint valley have different light intensities, and the reflected light passes through the optical component 132. After that, it is received by the sensor array 133 in the optical fingerprint module 130 and converted into a corresponding electrical signal, that is, a fingerprint detection signal; based on the fingerprint detection signal, fingerprint image data can be obtained, and fingerprint matching verification can be further performed, thereby The electronic device 10 implements an optical fingerprint recognition function.
在其他替代方案中，光学指纹模组130也可以采用内置光源或者外置光源来提供用于进行指纹检测识别的光信号。在这种情况下，光学指纹模组130不仅可以适用于如OLED显示屏等自发光显示屏，还可以适用于非自发光显示屏，比如液晶显示屏或者其他的被动发光显示屏。In other alternatives, the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection and identification. In this case, the optical fingerprint module 130 can be applied not only to self-luminous displays such as OLED displays, but also to non-self-luminous displays, such as liquid crystal displays or other passive light-emitting displays.
对于具有背光模组和液晶面板的液晶显示屏，为支持液晶显示屏的屏下指纹检测，电子设备10的光学指纹***还可以包括用于光学指纹检测的激励光源，该激励光源可以具体为红外光源或者特定波长非可见光的光源，其可以设置在该液晶显示屏的背光模组下方或者设置在电子设备10的保护盖板下方的边缘区域，而光学指纹模组130可以设置液晶面板或者保护盖板的边缘区域下方并通过光路引导以使得指纹检测光可以到达该光学指纹模组130；或者，该光学指纹模组130也可以设置在背光模组下方，且该背光模组通过对扩散片、增亮片、反射片等膜层进行开孔或者其他光学设计以允许指纹检测光穿过液晶面板和背光模组并到达该光学指纹模组130。当采用该光学指纹模组130采用内置光源或者外置光源来提供用于进行指纹检测的光信号时，其检测原理与上面描述内容是一致的。For a liquid crystal display with a backlight module and a liquid crystal panel, in order to support the under-screen fingerprint detection of the liquid crystal display, the optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection, and the excitation light source may specifically be infrared The light source or a light source of non-visible light of a specific wavelength can be arranged under the backlight module of the liquid crystal display or in the edge area under the protective cover of the electronic device 10, and the optical fingerprint module 130 can be provided with a liquid crystal panel or a protective cover Under the edge area of the board and guided by the light path so that the fingerprint detection light can reach the optical fingerprint module 130; or, the optical fingerprint module 130 can also be arranged under the backlight module, and the backlight module passes through the diffuser, The film layers such as the brightness enhancement sheet and the reflective sheet are provided with holes or other optical designs to allow the fingerprint detection light to pass through the liquid crystal panel and the backlight module and reach the optical fingerprint module 130. When the optical fingerprint module 130 adopts a built-in light source or an external light source to provide an optical signal for fingerprint detection, the detection principle is the same as that described above.
在具体实现上，该电子设备10还可以包括透明保护盖板，该盖板可以为玻璃盖板或者蓝宝石盖板，其位于该显示屏120的上方并覆盖该电子设备10的正面。因此，本申请实施例中，所谓的手指按压在该显示屏120实际上是指按压在该显示屏120上方的盖板或者覆盖该盖板的保护层表面。In specific implementation, the electronic device 10 may further include a transparent protective cover plate, which may be a glass cover plate or a sapphire cover plate, which is located above the display screen 120 and covers the front surface of the electronic device 10. Therefore, in the embodiments of the present application, the so-called finger pressing on the display screen 120 actually refers to pressing on the cover plate above the display screen 120 or covering the surface of the protective layer of the cover plate.
另一方面，该光学指纹模组130可以仅包括一个光学指纹传感器，此时 光学指纹模组130的指纹检测区域103的面积较小且位置固定，因此用户在进行指纹输入时需要将手指按压到该指纹检测区域103的特定位置，否则光学指纹模组130可能无法采集到指纹图像而造成用户体验不佳。在其他替代实施例中，该光学指纹模组130可以具体包括多个光学指纹传感器。该多个光学指纹传感器可以通过拼接方式并排设置在该显示屏120的下方，且该多个光学指纹传感器的感应区域共同构成该光学指纹模组130的指纹检测区域103。从而该光学指纹模组130的指纹检测区域103可以扩展到该显示屏的下半部分的主要区域，即扩展到手指惯常按压区域，从而实现盲按式指纹输入操作。进一步地，当该光学指纹传感器数量足够时，该指纹检测区域103还可以扩展到半个显示区域甚至整个显示区域，从而实现半屏或者全屏指纹检测。On the other hand, the optical fingerprint module 130 may only include one optical fingerprint sensor. At this time, the fingerprint detection area 103 of the optical fingerprint module 130 has a small area and a fixed position. Therefore, the user needs to press the finger to The specific position of the fingerprint detection area 103, otherwise the optical fingerprint module 130 may not be able to collect the fingerprint image, resulting in poor user experience. In other alternative embodiments, the optical fingerprint module 130 may specifically include multiple optical fingerprint sensors. The plurality of optical fingerprint sensors may be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the plurality of optical fingerprint sensors together constitute the fingerprint detection area 103 of the optical fingerprint module 130. Therefore, the fingerprint detection area 103 of the optical fingerprint module 130 can be extended to the main area of the lower half of the display screen, that is, to the area where the finger is habitually pressed, so as to realize the blind fingerprint input operation. Further, when the number of optical fingerprint sensors is sufficient, the fingerprint detection area 103 can also be extended to half of the display area or even the entire display area, thereby realizing half-screen or full-screen fingerprint detection.
随着终端产品的发展，对屏下指纹识别性能的要求越来越高。然而，在某些场景中，可能存在干手指的问题，干手指和显示屏的接触面积非常小，识别响应面积非常小，导致采集的指纹不连续，特征点容易丢失，影响了指纹识别的性能。因此，本申请实施例提供了一种指纹检测装置，能够解决目前的指纹识别的方案对干手指的指纹识别效果欠佳的问题，也就是能够提升对干手指的指纹识别性能。With the development of terminal products, the requirements for fingerprint recognition performance under the screen are getting higher and higher. However, in some scenes, there may be a problem of dry fingers. The contact area between dry fingers and the display screen is very small, and the recognition response area is very small, resulting in discontinuities in the collected fingerprints and easy loss of feature points, which affects the performance of fingerprint recognition. . Therefore, the embodiment of the present application provides a fingerprint detection device, which can solve the problem that the current fingerprint recognition scheme has poor fingerprint recognition effect on dry fingers, that is, can improve the fingerprint recognition performance on dry fingers.
具体地，本申请实施例的指纹检测装置适用于显示屏下方以实现屏下光学指纹检测。本申请实施例中的指纹检测装置包括多个指纹检测单元。下面将结合图3至图8，对该多个指纹检测单元中的任意一个指纹检测单元进行详细描述。Specifically, the fingerprint detection device of the embodiment of the present application is suitable for under the display screen to realize the under-screen optical fingerprint detection. The fingerprint detection device in the embodiment of the present application includes multiple fingerprint detection units. In the following, any one of the multiple fingerprint detection units will be described in detail with reference to FIGS. 3 to 8.
具体地，图3和图4均示出了本申请实施例的指纹检测单元20的示意图。该指纹检测单元20可以适用于图1至图2所示的电子设备10，或者说该指纹检测单元20可以是图1至图2所示的光学指纹模组130。Specifically, FIG. 3 and FIG. 4 both show a schematic diagram of the fingerprint detection unit 20 according to an embodiment of the present application. The fingerprint detection unit 20 may be applicable to the electronic device 10 shown in FIGS. 1 to 2, or the fingerprint detection unit 20 may be the optical fingerprint module 130 shown in FIGS. 1 to 2.
如图3和图4所示，该指纹检测单元20可以包括微透镜阵列210、至少一层挡光层以及光学感应像素阵列240。该微透镜阵列210可以用于设置在电子设备的显示屏的下方，该至少一层挡光层可以设置在该微透镜阵列210的下方，该光学感应像素阵列240可以设置在该至少一个挡光层的下方。As shown in FIGS. 3 and 4, the fingerprint detection unit 20 may include a micro lens array 210, at least one light blocking layer, and an optical sensing pixel array 240. The microlens array 210 can be used to be arranged under the display screen of an electronic device, the at least one light blocking layer can be arranged under the microlens array 210, and the optical sensing pixel array 240 can be arranged on the at least one light blocking layer. Below the layer.
应理解，该微透镜阵列210和至少一层挡光层可以是图2所示的光学组件132中包括的导光结构，该光学感应像素阵列240可以是图1至图2所示的具有多个光学感应单元131(也可以称为光学感应像素、感光像素、像素 单元等)的感应阵列133，为了简洁，此处不再赘述。It should be understood that the microlens array 210 and the at least one layer of light blocking layer may be the light guide structure included in the optical assembly 132 shown in FIG. 2, and the optical sensing pixel array 240 may be the light guide structure shown in FIGS. A sensing array 133 of one optical sensing unit 131 (also referred to as optical sensing pixels, photosensitive pixels, pixel units, etc.), for the sake of brevity, it will not be repeated here.
在本申请实施例中，该微透镜阵列210可以包括多个微透镜。例如，如图3和图4所示，该微透镜阵列210可以包括第一微透镜211、第二微透镜212以及第三微透镜213。该至少一个挡光层可以包括多个挡光层，例如，如图3和图4所示，该至少一个挡光层可以包括第一挡光层220和第二挡光层230。该光学感应像素阵列240可以包括多个光学感应像素，例如，如图3和图4所示，该光学感应像素阵列240可以包括第一光学感应像素241、第二光学感应像素242、第三光学感应像素243、第四光学感应像素244、第五光学感应像素245以及第六光学感应像素246。In the embodiment of the present application, the microlens array 210 may include a plurality of microlenses. For example, as shown in FIGS. 3 and 4, the microlens array 210 may include a first microlens 211, a second microlens 212, and a third microlens 213. The at least one light blocking layer may include a plurality of light blocking layers. For example, as shown in FIGS. 3 and 4, the at least one light blocking layer may include a first light blocking layer 220 and a second light blocking layer 230. The optical sensing pixel array 240 may include a plurality of optical sensing pixels. For example, as shown in FIGS. 3 and 4, the optical sensing pixel array 240 may include a first optical sensing pixel 241, a second optical sensing pixel 242, and a third optical sensing pixel. The sensing pixel 243, the fourth optical sensing pixel 244, the fifth optical sensing pixel 245, and the sixth optical sensing pixel 246.
可选地，该微透镜阵列210中每个微透镜可以以圆形进行填充，也可以以方形进行填充；另外，该微透镜阵列210中每个微透镜的材料可以是塑料或者玻璃；该微透镜阵列210中每个微透镜生产工艺可以通过微纳加工工艺或者压模工艺实现，本申请实施例并不限于此。Optionally, each microlens in the microlens array 210 can be filled in a circle or a square shape; in addition, the material of each microlens in the microlens array 210 can be plastic or glass; The production process of each microlens in the lens array 210 can be implemented by a micro-nano processing process or a compression molding process, and the embodiment of the present application is not limited thereto.
在本申请实施例中，该至少一层挡光层和该微透镜阵列210可以集成设置，或该至少一层挡光层和该光学感应像素阵列240可以集成设置，甚至该微透镜阵列210、该至少一个挡光层和该光学感应像素240均集成设置成一个部件，本申请实施例并不限于此。In the embodiment of the present application, the at least one light blocking layer and the microlens array 210 may be integratedly arranged, or the at least one light blocking layer and the optical sensing pixel array 240 may be integratedly arranged, even the microlens array 210, The at least one light blocking layer and the optical sensing pixel 240 are integrated into one component, and the embodiment of the present application is not limited thereto.
可选地，该微透镜阵列210中的每个微透镜可以满足以下条件中的至少一项：该微透镜的聚光面在与其光轴垂直的平面上的投影为矩形或圆形；该微透镜的聚光面为球面或非球面；该微透镜的聚光面的各个方向上的曲率相同；该微透镜包括至少一片透镜；以及该微透镜的焦距范围为10um-2mm。Optionally, each microlens in the microlens array 210 may satisfy at least one of the following conditions: the projection of the condensing surface of the microlens on a plane perpendicular to its optical axis is rectangular or circular; The condensing surface of the lens is spherical or aspheric; the curvature of the condensing surface of the microlens is the same in all directions; the microlens includes at least one lens; and the focal length of the microlens is in the range of 10um-2mm.
在本申请实施例中，该微透镜阵列210满足以下条件的至少一项：该微透镜阵列210呈多边形排列和该微透镜阵列210的占空比的范围为100％-50％。例如该微透镜阵列210呈正方形或六边形排列。又例如该微透镜阵列210的占空比为85％。In the embodiment of the present application, the microlens array 210 satisfies at least one of the following conditions: the microlens array 210 is in a polygonal arrangement and the duty cycle of the microlens array 210 ranges from 100% to 50%. For example, the microlens array 210 is arranged in a square or hexagonal shape. For another example, the duty cycle of the micro lens array 210 is 85%.
在本申请实施例中，该微透镜阵列210的周期与该光学感应像素阵列240的周期不相等，且该微透镜阵列210的周期是该光学感应像素阵列240的周期的有理数倍，进而避免了指纹成像过程中出现莫尔条纹并提升指纹识别效果。In the embodiment of the present application, the period of the microlens array 210 is not equal to the period of the optical sensing pixel array 240, and the period of the microlens array 210 is a rational multiple of the period of the optical sensing pixel array 240, thereby avoiding Moiré fringes appear during fingerprint imaging and improve fingerprint recognition.
在本申请实施例中，该指纹检测单元20与该显示屏之间的距离可以根据实际应用进行设备，例如，可以设置为20um-1000um，以保证指纹检测单 元20与显示屏具有足够的安全距离，进而保证不会因电子设备振动或者跌落而引起指纹检测单元20撞击显示屏而造成器件损坏。In the embodiment of the present application, the distance between the fingerprint detection unit 20 and the display screen can be set according to actual applications. For example, it can be set to 20um-1000um to ensure that the fingerprint detection unit 20 has a sufficient safety distance from the display screen. Therefore, it is ensured that the fingerprint detection unit 20 does not hit the display screen due to the vibration or fall of the electronic device, and the device is not damaged.
应理解，本申请实施例的至少一个挡光层形成有微透镜阵列210中的每个微透镜对应的多个导光通道，该每个微透镜对应的多个导光通道中每个导光通道与其对应的微透镜的光轴之间的夹角小于90°，也就是说，对于任意一个微透镜，其对应的多个导光通道均为倾斜的，而不是竖直的。It should be understood that at least one light blocking layer of the embodiment of the present application is formed with a plurality of light guide channels corresponding to each microlens in the microlens array 210, and each light guide channel in the plurality of light guide channels corresponding to each microlens The angle between the optical axis of the channel and the corresponding microlens is less than 90°, that is, for any one microlens, the corresponding multiple light guide channels are all inclined rather than vertical.
需要说明的是，上述夹角可以是导光通道的中心轴线和微透镜的光轴之间的夹角，也可以是经过该导光通道的任一直线与该光轴的夹角；此外，该夹角的取值范围可以是0°至90°内的任一范围，例如该夹角的范围可以为15°至60°，也可以是10°至70°，例如，该夹角可以等于20°，或者也可以等于40°，但本申请实施例并不限于此。It should be noted that the aforementioned included angle may be the included angle between the central axis of the light guide channel and the optical axis of the microlens, or the included angle between any straight line passing through the light guide channel and the optical axis; in addition, The value range of the included angle can be any range from 0° to 90°. For example, the range of the included angle can be 15° to 60°, or 10° to 70°. For example, the included angle can be equal to 20°, or may be equal to 40°, but the embodiment of the present application is not limited thereto.
应理解，导光通道与其对应微透镜的光轴之间的夹角可以根据实际应用设置为任意一个不等于90°的值，例如，可以通过适当的调整微透镜阵列210、至少一个挡光层以及光学感应像素阵列240之间的距离，来调整导光通道与其对应微透镜的光轴之间的夹角的大小。由于导光通道与其对应的微透镜的光轴之间的夹角不等于90°，那么同一微透镜的多个导光通道的最底部可能位于同一微透镜的下方，也可以位于不同微透镜的下方。It should be understood that the angle between the light guide channel and the optical axis of the corresponding microlens can be set to any value not equal to 90° according to actual applications. For example, the microlens array 210 and the at least one light blocking layer can be adjusted appropriately. And the distance between the optical sensing pixel array 240 to adjust the angle between the light guide channel and the optical axis of the corresponding micro lens. Since the angle between the light guide channel and the optical axis of the corresponding microlens is not equal to 90°, the bottom of multiple light guide channels of the same microlens may be located under the same microlens, or may be located at different microlens Below.
可选地，对于任意一个微透镜，该微透镜对应的多个导光通道的底部可能仍然位于该微透镜的下方，例如，如图4所示。Optionally, for any microlens, the bottoms of multiple light guide channels corresponding to the microlens may still be located below the microlens, for example, as shown in FIG. 4.
可选地，对于任意一个微透镜，该微透镜对应的多个导光通道的底部还可能不位于该微透镜的下方，而是位于其他不同的微透镜的下方。例如，同一个微透镜对应的多个导光通道的底部可能分别延伸至相邻的多个微透镜的下方，例如，如图3所示；或者，同一个微透镜对应的多个导光通道的底部还可能分别延伸至不与该微透镜相邻的其他多个微透镜的下方，本申请实施例并不限于此。Optionally, for any one microlens, the bottoms of the multiple light guide channels corresponding to the microlens may not be located below the microlens, but are located below other different microlenses. For example, the bottoms of multiple light guide channels corresponding to the same microlens may respectively extend below multiple adjacent microlenses, for example, as shown in FIG. 3; or, multiple light guide channels corresponding to the same microlens The bottom of the microlens may also respectively extend below other microlenses that are not adjacent to the microlens, and the embodiment of the present application is not limited to this.
应理解，为了便于说明，下面将分别结合图3以该每个微透镜对应的多个导光通道的底部分别延伸至相邻的多个微透镜的下方为例、以及结合图4以每个微透镜对应的多个导光通道的底部仍然位于该微透镜下方为例进行说明，对于其他情况，可以通过调整微透镜阵列210、至少一个挡光层以及光学感应像素阵列240之间的距离，或者，调整导光通道与其对应微透镜的光轴之间的夹角的大小等方式实现，为了简洁，在此不再赘述。It should be understood that, for ease of description, the following will be combined with FIG. 3 to take the bottom of the plurality of light guide channels corresponding to each microlens respectively extending below the adjacent plurality of microlenses as an example, and in conjunction with FIG. The bottom of the multiple light guide channels corresponding to the microlens is still located below the microlens as an example. For other cases, the distance between the microlens array 210, at least one light blocking layer and the optical sensing pixel array 240 can be adjusted. Alternatively, it can be achieved by adjusting the size of the angle between the light guide channel and the optical axis of the corresponding microlens. For brevity, it will not be repeated here.
具体地，如图3所示，该第一挡光层220和该第二挡光层230中分别设置有至少一个开孔，以便于形成该多个微透镜中每个微透镜(即第一微透镜211、第二微透镜212以及第三微透镜213)对应的多个导光通道。具体地，为了便于描述，这里以每个微透镜下方位置能够覆盖的面积范围内包括的孔为例进行描述，以下简称为微透镜的覆盖范围。例如，在图3中，该第一挡光层220设置有第一微透镜211覆盖范围内的第一开孔221和第二开孔222；该第一挡光层220还设置有第二微透镜212覆盖范围内的第二开孔222和第三开孔223；该第一挡光层220中还设置有第三微透镜213覆盖范围内的第三开孔223和第四开孔224；再例如，在图4中也有类似的设置，具体设置如图4所示，在此不赘述。Specifically, as shown in FIG. 3, the first light-blocking layer 220 and the second light-blocking layer 230 are respectively provided with at least one opening to facilitate the formation of each of the plurality of microlenses (ie, the first The microlens 211, the second microlens 212, and the third microlens 213) correspond to multiple light guide channels. Specifically, for ease of description, the hole included in the area covered by the position below each microlens is taken as an example for description, which is hereinafter referred to as the coverage of the microlens. For example, in FIG. 3, the first light blocking layer 220 is provided with a first opening 221 and a second opening 222 covered by the first microlens 211; the first light blocking layer 220 is also provided with a second microlens The second opening 222 and the third opening 223 within the coverage of the lens 212; the first light blocking layer 220 is also provided with the third opening 223 and the fourth opening 224 within the coverage of the third microlens 213; For another example, there are similar settings in Figure 4, and the specific settings are shown in Figure 4, which will not be repeated here.
类似地，如图3所示，该第二挡光层230设置有第一微透镜211覆盖范围内的第五开孔231和第六开孔232；该第二挡光层230还设置有第二微透镜212覆盖范围内的第七开孔233和第八开孔234；该第二挡光层230中还设置有第三微透镜213覆盖范围内的第九开孔235和第十开孔236。同样的，图4中也有类似的设置，具体设置如图4所示，在此不赘述。Similarly, as shown in FIG. 3, the second light blocking layer 230 is provided with a fifth opening 231 and a sixth opening 232 covered by the first microlens 211; the second light blocking layer 230 is also provided with a The seventh opening 233 and the eighth opening 234 within the coverage of the two microlenses 212; the second light blocking layer 230 is also provided with a ninth opening 235 and the tenth opening within the coverage of the third microlens 213 236. Similarly, there are similar settings in Figure 4, and the specific settings are shown in Figure 4, which will not be repeated here.
为了便于说明，下面主要以该第二微透镜212为例进行描述，但其相关说明同样可以适用于第一微透镜211和第三微透镜213。具体地，如图3所示，该第二微透镜212对应的多个导光通道可以包括由第二开孔222和第六开孔232形成的导光通道，以及由第三开孔223和第九开孔235形成的导光通道。另外，由第二开孔222和第六开孔232形成的导光通道延伸至第一微透镜211的下方，由第三开孔223和第九开孔235形成的导光通道延伸至第三微透镜213的下方。如图4所示，该第二微透镜212对应的多个导光通道可以包括：由开孔226和开孔233形成的导光通道，开孔226和开孔234形成的导光通道，由开孔227和开孔233形成的导光通道以及由开孔227和开孔234形成的导光通道。另外，上述四个导光通道均延伸至该第二微透镜211的下方。For ease of description, the second microlens 212 is mainly used as an example for description below, but the related description can also be applied to the first microlens 211 and the third microlens 213. Specifically, as shown in FIG. 3, the plurality of light guide channels corresponding to the second microlens 212 may include a light guide channel formed by a second opening 222 and a sixth opening 232, and a third opening 223 and The light guide channel formed by the ninth opening 235. In addition, the light guide channel formed by the second opening 222 and the sixth opening 232 extends below the first microlens 211, and the light guide channel formed by the third opening 223 and the ninth opening 235 extends to the third Below the micro lens 213. As shown in FIG. 4, the plurality of light guide channels corresponding to the second microlens 212 may include: a light guide channel formed by an opening 226 and an opening 233, a light guide channel formed by an opening 226 and an opening 234, The light guide channel formed by the opening 227 and the opening 233 and the light guide channel formed by the opening 227 and the opening 234. In addition, the four light guide channels described above all extend below the second microlens 211.
应理解，本申请实施例中描述的任意一个微透镜对应的孔指的是其对应的导光通道经过的多个孔，例如，该第二微透镜212对应的孔指的是其导光通道经过的多个孔，例如图3中的该第二微透镜212对应的孔可以包括上述两个导光通道经过的孔，即第二微透镜212对应的孔至少包括第二开孔222、第六开孔232、第三开孔223和第九开孔235；再例如，图4中的第二微透 镜212对应的孔可以包括上述四个导光通道的孔，即开孔226、开孔227、开孔233和开孔234。It should be understood that the hole corresponding to any one microlens described in the embodiments of the present application refers to the multiple holes through which its corresponding light guide channel passes. For example, the hole corresponding to the second microlens 212 refers to its light guide channel. For example, the hole corresponding to the second microlens 212 in FIG. 3 may include the holes through which the two light guide channels pass, that is, the hole corresponding to the second microlens 212 includes at least the second opening 222 and the second opening 222. Six openings 232, third openings 223, and ninth openings 235; for another example, the holes corresponding to the second microlens 212 in FIG. 4 may include the holes of the four light guide channels mentioned above, namely the openings 226 and the openings. 227. Opening 233 and opening 234.
进一步地，该微透镜阵列210中的每个微透镜对应的多个导光通道中的每个导光通道的下方可以设置有一个光学感应像素。Further, an optical sensing pixel may be provided under each of the light guide channels corresponding to each micro lens in the micro lens array 210.
仍然以图3中的该第二微透镜212为例，由第二开孔222和第六开孔232形成的导光通道的下方设置有第二光学感应像素242，由第三开孔223和第九开孔235形成的导光通道的下方设置有第五光学感应像素245。而对于图4中的第二微透镜221，由开孔226和开孔233形成的导光通道以及由开孔227和开孔233形成的导光通道下方均设置有第三光学感应像素243；由开孔226和开孔234形成的导光通道以及由开孔227和开孔234形成的导光通道下方均设置有第四光学感应像素244。Still taking the second microlens 212 in FIG. 3 as an example, a second optical sensing pixel 242 is provided below the light guide channel formed by the second opening 222 and the sixth opening 232, and the third opening 223 and A fifth optical sensing pixel 245 is provided under the light guide channel formed by the ninth opening 235. As for the second microlens 221 in FIG. 4, the light guide channel formed by the opening 226 and the opening 233 and the light guide channel formed by the opening 227 and the opening 233 are both provided with a third optical sensing pixel 243; The light guide channel formed by the opening 226 and the opening 234 and the light guide channel formed by the opening 227 and the opening 234 are both provided with a fourth optical sensing pixel 244.
更进一步地，该微透镜阵列210中的每个微透镜的下方设置有多个光学感应像素，该每个微透镜下方设置的多个光学感应像素分别用于接收经由一个或者多个微透镜汇聚的并通过对应的导光通道传输的光信号，该光信号用于检测手指的指纹信息。也就是说，对于任意一个微透镜，若该微透镜对应的多个导光通道的底部仍然位于该微透镜的下方，则该微透镜下方设置的多个光学感应像素分别用于接收经由该微透镜汇聚的，并且通过其对应的多个导光通道传输的光信号；或者，若该微透镜对应的多个导光通道的底部延伸至相邻的多个微透镜的下方，则该微透镜下方设置的多个光学感应像素分别用于接收经由相邻的多个微透镜汇聚的并通过对应的导光通道传输的光信号。Furthermore, a plurality of optical sensing pixels are arranged below each microlens in the microlens array 210, and the plurality of optical sensing pixels arranged below each microlens are respectively used for receiving convergents through one or more microlenses. The optical signal transmitted through the corresponding light guide channel is used to detect the fingerprint information of the finger. That is to say, for any microlens, if the bottom of the plurality of light guide channels corresponding to the microlens is still located below the microlens, the plurality of optical sensing pixels arranged under the microlens are respectively used for receiving through the microlens The optical signal converged by the lens and transmitted through its corresponding multiple light guide channels; or, if the bottom of the multiple light guide channels corresponding to the micro lens extends below the adjacent multiple micro lenses, the micro lens The plurality of optical sensing pixels arranged below are respectively used to receive the optical signals converged by the adjacent plurality of microlenses and transmitted through the corresponding light guide channel.
仍然以图3中的该第二微透镜212为例，在图3中的该第二微透镜212的覆盖的正下方范围内设置有两个光学感应像素，也就是该第二微透镜212的下方可以设置有第三光学感应像素243和第四光学感应像素244，其中，该第三光学感应像素243可以用于接收经过第一微透镜211汇聚的并通过由第二开孔222和第七开孔233形成的导光通道传输的倾斜光信号，该第四光学感应像素244可以用于接收经过第三微透镜213汇聚的并通过由第三开孔223和第八开孔234形成的导光通道传输的倾斜光信号，并且，第一微透镜211和第三微透镜213均与第二微透镜212相邻。Still taking the second microlens 212 in FIG. 3 as an example, two optical sensing pixels are provided in the range directly below the coverage of the second microlens 212 in FIG. 3, that is, the second microlens 212 A third optical sensing pixel 243 and a fourth optical sensing pixel 244 may be provided below, wherein the third optical sensing pixel 243 may be used to receive the converged by the first microlens 211 and pass through the second opening 222 and the seventh aperture. The oblique light signal transmitted by the light guide channel formed by the opening 233, the fourth optical sensing pixel 244 can be used to receive the light converging through the third microlens 213 and passing through the guide formed by the third opening 223 and the eighth opening 234 The oblique light signal transmitted by the optical channel, and both the first micro lens 211 and the third micro lens 213 are adjacent to the second micro lens 212.
再例如，如图4所示，仍然以第二微透镜212为例，其覆盖的正下方范围内设置有两个光学感应像素，也就是该第二微透镜212的下方可以设置有 第三光学感应像素243和第四光学感应像素244，其中，该第三光学感应像素243可以用于接收经过该第二微透镜212汇聚的并通过由开孔226和开孔233形成的导光通道传输的倾斜光信号，该第三光学感应像素243还可以用于接收经过该第二微透镜212汇聚的并通过由开孔227和开孔233形成的导光通道传输的倾斜光信号；类似的，该第四光学感应像素244可以用于接收经过第二微透镜212汇聚的并通过由开孔226和开孔234形成的导光通道传输的倾斜光信号，该第四光学感应像素244还可以用于接收经过第二微透镜212汇聚的并通过由开孔227和开孔234形成的导光通道传输的倾斜光信号。For another example, as shown in FIG. 4, still taking the second microlens 212 as an example, two optical sensing pixels are arranged in the range directly below it, that is, a third optical sensor may be arranged under the second microlens 212. The sensing pixel 243 and the fourth optical sensing pixel 244, wherein the third optical sensing pixel 243 can be used to receive the light converged by the second microlens 212 and transmitted through the light guide channel formed by the opening 226 and the opening 233 Tilt light signal, the third optical sensing pixel 243 can also be used to receive the tilt light signal converged by the second microlens 212 and transmitted through the light guide channel formed by the opening 227 and the opening 233; similarly, the The fourth optical sensing pixel 244 can be used to receive the oblique light signal converged by the second microlens 212 and transmitted through the light guide channel formed by the opening 226 and the opening 234. The fourth optical sensing pixel 244 can also be used for The oblique light signal converged by the second microlens 212 and transmitted through the light guide channel formed by the opening 227 and the opening 234 is received.
此外，该微透镜阵列210中的每个微透镜下方的多个光学感应像素的个数可以根据实际应用进行设置，例如，本申请实施例中以每个微透镜下方设置4个光学感应像素为例；或者，每个微透镜下方也可以对应9个光学感应像素，或者也可以设置为其他个数，本申请实施例并不限于此。另外，每个微透镜下方的多个光学感应像素的分布可以呈多边形。例如，该多边形包括但不限于矩形或菱形。又例如，该微透镜阵列210中的每个微透镜下方的多个光学感应像素的分布可以呈圆形或椭圆形。In addition, the number of multiple optical sensing pixels under each microlens in the microlens array 210 can be set according to actual applications. For example, in the embodiment of the present application, it is assumed that 4 optical sensing pixels are arranged under each microlens. For example, or, under each microlens, there may be 9 optical sensing pixels, or other numbers may be set, and the embodiment of the present application is not limited to this. In addition, the distribution of multiple optical sensing pixels under each microlens may be polygonal. For example, the polygon includes but is not limited to a rectangle or a diamond. For another example, the distribution of multiple optical sensing pixels under each microlens in the microlens array 210 may be circular or elliptical.
由于该微透镜阵列中的微透镜呈阵列式分布，因此当该每个微透镜下方的多个光学感应像素的分布呈多边形时，能够有效简化微透镜阵列和该光学感应阵列的对应方式，进而简化该指纹检测单元的结构设计。具体地，图5和图6分别是图3或者图4中所示的第二微透镜212的两个示意性俯视图。如图5和图6所示，这里假设该第二微透镜212下方可以设置4个光学感应像素，其中图5中的4个光学感应像素的分布呈现为矩形，图6中的4个微透镜的分布可以呈现为菱形。Since the microlenses in the microlens array are distributed in an array, when the distribution of the multiple optical sensing pixels under each microlens is polygonal, the correspondence between the microlens array and the optical sensing array can be effectively simplified, and then Simplify the structural design of the fingerprint detection unit. Specifically, FIG. 5 and FIG. 6 are two schematic top views of the second microlens 212 shown in FIG. 3 or FIG. 4, respectively. As shown in Figures 5 and 6, it is assumed here that four optical sensing pixels can be arranged under the second microlens 212. The distribution of the four optical sensing pixels in Figure 5 is rectangular, and the four microlenses in Figure 6 The distribution of can be presented as a diamond.
需要说明的是，本申请实施例对每个微透镜和其下方光学感应像素的具体对应方式不做限定。以第二微透镜212下方的第三光学感应像素243为例，该第二微透镜212可以覆盖第三光学感应像素243的感光区域(AA)的部分或全部区域。优选地，以图3的导光通道为例，该第二微透镜212可以覆盖第三光学感应像素243的感光区域(PD area，AA)中的经由该第一微透镜211汇聚的并通过第二开孔222和第七开孔233形成的导光通道传输的倾斜光信号能够照射到的区域，例如图5和图6中每个感光区域中斜线阴影区域，以保证该第三光学感应像素243能够接收到足够的光信号，以提升指纹识别效果。It should be noted that the embodiment of the present application does not limit the specific corresponding manner of each microlens and the optical sensing pixel below it. Taking the third optical sensing pixel 243 under the second micro lens 212 as an example, the second micro lens 212 may cover part or all of the photosensitive area (AA) of the third optical sensing pixel 243. Preferably, taking the light guide channel of FIG. 3 as an example, the second microlens 212 may cover the photosensitive area (PD area, AA) of the third optical sensing pixel 243 that is converged by the first microlens 211 and passes through the first microlens 211. The area that can be illuminated by the oblique light signal transmitted by the light guide channel formed by the second opening 222 and the seventh opening 233, such as the oblique shaded area in each photosensitive area in FIG. 5 and FIG. 6, to ensure the third optical sensing The pixel 243 can receive enough light signals to improve the fingerprint recognition effect.
下面对每个微透镜对应的多个导光通道的设计方式进行详细说明。The design of multiple light guide channels corresponding to each microlens will be described in detail below.
在本申请的一些实施例中，微透镜阵列210中的每个微透镜对应的多个导光通道可以沿同一微透镜的光轴方向中心对称分布。通过中心对称的方式设置每个微透镜对应的多个导光通道，能够降低该指纹检测单元的工艺复杂度，也就是能够降低整个指纹检测装置的工艺复杂度。In some embodiments of the present application, the multiple light guide channels corresponding to each microlens in the microlens array 210 may be centrally symmetrically distributed along the optical axis direction of the same microlens. By arranging multiple light guide channels corresponding to each microlens in a symmetrical manner, the process complexity of the fingerprint detection unit can be reduced, that is, the process complexity of the entire fingerprint detection device can be reduced.
仍然以图3中的第二微透镜212为例，如图5所示，对于该第二微透镜212的导光通道中能够延伸至右上角微透镜下方的导光通道以及能够延伸至左下角微透镜下方的导光通道，二者沿该第二微透镜212的光轴方向中心对称；对于第二微透镜212的多个导光通道中能够延伸至左上角微透镜下方的导光通道以及能够延伸至右下角微透镜下方的导光通道，二者也沿该第二微透镜212的光轴方向中心对称。图4中的导光通道也类似，为了简洁，在此不再赘述。Still taking the second microlens 212 in FIG. 3 as an example, as shown in FIG. 5, the light guide channel of the second microlens 212 can extend to the light guide channel below the microlens in the upper right corner and can extend to the lower left corner. The light guide channel under the microlens is symmetrical along the optical axis direction of the second microlens 212; the light guide channel of the multiple light guide channels for the second microlens 212 can extend below the microlens in the upper left corner and The light guide channel that can extend to the lower right corner of the microlens is also symmetrical along the optical axis of the second microlens 212. The light guide channel in FIG. 4 is also similar, for the sake of brevity, it will not be repeated here.
在本申请的一些实施例中，微透镜阵列210中的每个微透镜对应的多个导光通道中的每个导光通道和第一平面可以形成预设夹角，以使该每个微透镜下方设置的多个光学感应像素分别用于接收经由一个或者多个微透镜汇聚的并通过对应的导光通道传输的光信号，其中，该第一平面为与该显示屏平行的平面。通过该预设夹角可以保证该每个微透镜对应的多个导光通道的底端分别延伸至同一微透镜下方或者延伸至其相邻的多个微透镜的下方。In some embodiments of the present application, each light guide channel of the plurality of light guide channels corresponding to each microlens in the microlens array 210 and the first plane may form a preset angle, so that each microlens A plurality of optical sensing pixels arranged under the lens are respectively used for receiving optical signals converged through one or more microlenses and transmitted through the corresponding light guide channel, wherein the first plane is a plane parallel to the display screen. The preset included angle can ensure that the bottom ends of the multiple light guide channels corresponding to each microlens extend below the same microlens or extend below the adjacent multiple microlenses.
如图3和图5所示，仍然以该第二微透镜212为例，该光学感应像素阵列240所在的平面和该第一平面平行，由第二开孔222和第六开孔232形成的导光通道和与该光学感应像素阵列240所在的平面形成第一角度，由第三开孔223和第九开孔235形成的导光通道和与该光学感应像素阵列240所在的平面形成第二角度。其中该第一角度等于该第二角度。当然，在其他可替代实施例中，该第一角度也可以不等于该第二角度，本申请实施例对此不做限制。并且图4中的导光通道也类似，为了简洁，在此不再赘述。As shown in FIGS. 3 and 5, still taking the second microlens 212 as an example, the plane on which the optical sensing pixel array 240 is located is parallel to the first plane, and is formed by the second opening 222 and the sixth opening 232 The light guide channel forms a first angle with the plane where the optical sensing pixel array 240 is located, and the light guide channel formed by the third opening 223 and the ninth opening 235 forms a second angle with the plane where the optical sensing pixel array 240 is located. angle. The first angle is equal to the second angle. Of course, in other alternative embodiments, the first angle may not be equal to the second angle, which is not limited in the embodiment of the present application. In addition, the light guide channel in FIG. 4 is also similar, and for the sake of brevity, it will not be repeated here.
需要说明的是，该预设夹角可以是导光通道的中心轴线和该第一平面的夹角，也可以是经过该导光通道的任一直线与该第一平面的夹角；此外，该预设夹角的范围可以是0度至90度内的任一范围，例如该预设夹角的范围可以为15度至60度，也可以是10度至70度，本申请对此不做具体限定。It should be noted that the preset included angle may be the included angle between the central axis of the light guide channel and the first plane, or the included angle between any straight line passing through the light guide channel and the first plane; in addition, The range of the preset angle can be any range from 0 degrees to 90 degrees. For example, the range of the preset angle can be 15 degrees to 60 degrees, or 10 degrees to 70 degrees. This application does not Make specific restrictions.
在本申请的一些实施例中，微透镜阵列210中的每个微透镜对应的多个导光通道在该第一平面的投影相对同一微透镜的光轴在该第一平面的投影 可以中心对称分布，以保证该光学感应像素阵列240中的每个光学感应像素均能够接收到足够的光信号，进而提升指纹图像的分辨率和指纹识别效果。In some embodiments of the present application, the projection of the multiple light guide channels corresponding to each microlens in the microlens array 210 on the first plane may be symmetrical with respect to the projection of the optical axis of the same microlens on the first plane. Distribution to ensure that each optical sensing pixel in the optical sensing pixel array 240 can receive enough light signals, thereby improving the resolution of the fingerprint image and the fingerprint recognition effect.
如图3和图5所示，仍然以该第二微透镜212为例，由于每个导光通道为倾斜通道，因此每个导光通道在该第一平面上的端面均为椭圆形，该第二微透镜212对应的4个导光通道在靠近该光学感应像素阵列240的端面沿该第二微透镜212的光轴在该第一平面的投影中心对称分布。As shown in FIGS. 3 and 5, the second microlens 212 is still taken as an example. Since each light guide channel is an inclined channel, the end surface of each light guide channel on the first plane is an ellipse. The four light guide channels corresponding to the second microlens 212 are symmetrically distributed along the optical axis of the second microlens 212 at the end surface close to the optical sensing pixel array 240 on the projection center of the first plane.
下面对指纹检测单元20中的至少一个挡光层的实现方式进行详细说明。The implementation of at least one light blocking layer in the fingerprint detection unit 20 will be described in detail below.
在本申请的一些实施例中，该指纹检测单元20可以包括多个挡光层，不同挡光层中设置有与每个微透镜对应的至少一个开孔，以形成该微透镜对应的多个导光通道。例如，该至少一个挡光层可以包括上文中针对图3或图4所描述的第一挡光层220和第二挡光层230。再例如，除了图3和图4中描述的两层挡光层以外，该指纹检测单元20还可以包括更多的挡光层，以图3为例，对应的，图7是本申请实施例的指纹检测单元20的另一示意性结构图。如图7所示，该指纹检测单元20除了包括图3所示的第一挡光层220和第二挡光层230之外还可以包括第三挡光层260，其中，该第三挡光层260包括第十一开孔261、第十二开孔262以及第十三开孔263。为了便于说明，下面主要以图3和图7为例进行描述。In some embodiments of the present application, the fingerprint detection unit 20 may include a plurality of light-blocking layers, and different light-blocking layers are provided with at least one opening corresponding to each microlens to form a plurality of corresponding microlenses. Light guide channel. For example, the at least one light blocking layer may include the first light blocking layer 220 and the second light blocking layer 230 described above with respect to FIG. 3 or FIG. 4. For another example, in addition to the two light-blocking layers described in FIG. 3 and FIG. 4, the fingerprint detection unit 20 may also include more light-blocking layers. Take FIG. 3 as an example. Correspondingly, FIG. 7 is an embodiment of the present application. Another schematic structural diagram of the fingerprint detection unit 20. As shown in FIG. 7, the fingerprint detection unit 20 may include a third light-blocking layer 260 in addition to the first light-blocking layer 220 and the second light-blocking layer 230 shown in FIG. 3, wherein the third light-blocking layer The layer 260 includes an eleventh opening 261, a twelfth opening 262 and a thirteenth opening 263. For ease of description, the following description mainly takes FIG. 3 and FIG. 7 as examples.
在一些实现方式中，不同挡光层中的与同一微透镜对应的开孔的数量可能相同，例如如图4所示；或者不同挡光层中的与同一微透镜对应的开孔的数量由上至下可以依次增大或者减小，以形成每个微透镜对应的多个导光通道。In some implementations, the number of openings corresponding to the same microlens in different light blocking layers may be the same, as shown in FIG. 4; or the number of openings corresponding to the same microlens in different light blocking layers is determined by The top to bottom can be increased or decreased in sequence to form multiple light guide channels corresponding to each microlens.
以不同挡光层中的与同一微透镜对应的开孔的数量由上至下可以依次增大为例，换句话说，不同挡光层中的开孔之间的间距可以由上至下依次减小。例如，如图3所示，该第一挡光层220中的相邻的两个开孔之间的间距D大于该第二挡光层230中的相邻两个开孔之间的间距d。通过该多个挡光层中的开孔密度较小的上部分挡光层遮挡大部分指纹检测单元不期望接收的光信号，并通过该多个挡光层中的开孔密度较小的上部分挡光层与开孔密度较大的下部分挡光层可以形成每个微透镜对应多个导光通道。此外，还可以降低该至少一个挡光层的制备复杂度并增加上部分遮光层的强度。Take for example that the number of openings in different light blocking layers corresponding to the same microlens can be increased sequentially from top to bottom. In other words, the spacing between the openings in different light blocking layers can be sequentially increased from top to bottom Decrease. For example, as shown in FIG. 3, the distance D between two adjacent openings in the first light blocking layer 220 is greater than the distance d between two adjacent openings in the second light blocking layer 230 . Most of the light signals that the fingerprint detection unit does not expect to receive are blocked by the upper part of the plurality of light blocking layers with a smaller opening density, and the upper portion of the plurality of light blocking layers with a smaller opening density is The partial light-blocking layer and the lower part of the light-blocking layer with larger opening density can form multiple light guide channels for each microlens. In addition, the manufacturing complexity of the at least one light-shielding layer can also be reduced and the strength of the upper part of the light-shielding layer can be increased.
在本申请实施例中，该多个挡光层中的底层挡光层中可以设置有每个微透镜对应的多个开孔，每个微透镜对应的多个导光通道分别穿过该底层挡光 层中的同一微透镜对应的多个开孔。例如，如图3和图7所示，仍然以第二微透镜212为例，该第二挡光层230上设置有该第二微透镜212对应的第六开孔232和第九开孔235，该第二微透镜212的多个导光通道中的两个导光通道会分别经过该第六开孔232和第九开孔235。In the embodiment of the present application, the bottom light blocking layer of the plurality of light blocking layers may be provided with a plurality of openings corresponding to each microlens, and a plurality of light guide channels corresponding to each microlens respectively pass through the bottom layer. A plurality of openings corresponding to the same micro lens in the light blocking layer. For example, as shown in FIGS. 3 and 7, still taking the second microlens 212 as an example, the second light blocking layer 230 is provided with a sixth opening 232 and a ninth opening 235 corresponding to the second microlens 212. Two of the light guide channels of the second microlens 212 pass through the sixth opening 232 and the ninth opening 235 respectively.
在本申请实施例中，该多个挡光层中的顶层挡光层在每个微透镜的光轴上可以设置有开孔，并且该微透镜对应的多个导光通道均穿过该顶层挡光层中与该微透镜对应的开孔。例如，如图7所示，对于第二微透镜212，该第三挡光层260可以在该第二微透镜260的光轴方向靠近该第一挡光层220的位置设置有第十二开孔262。此时，该第二微透镜212对应的一个导光通道穿过该第十二开孔262、第二开孔222以及第六开孔232，该第二微透镜212对应的另一个导光通道穿过该第十二开孔262、第三开孔223以及第九开孔235，即该第二微透镜212的这两个导光通道均会穿过该第十二开孔262。In the embodiment of the present application, the top light-blocking layer of the plurality of light-blocking layers may be provided with an opening on the optical axis of each microlens, and the plurality of light guide channels corresponding to the microlens all pass through the top layer The opening corresponding to the micro lens in the light blocking layer. For example, as shown in FIG. 7, for the second microlens 212, the third light blocking layer 260 may be provided with a twelfth opening at a position close to the first light blocking layer 220 in the optical axis direction of the second microlens 260.孔262. At this time, a light guide channel corresponding to the second microlens 212 passes through the twelfth opening 262, the second opening 222, and the sixth opening 232, and another light guide channel corresponding to the second microlens 212 Passing through the twelfth opening 262, the third opening 223 and the ninth opening 235, that is, the two light guide channels of the second microlens 212 pass through the twelfth opening 262.
在本申请实施例中，对于同一微透镜对应的多个导光通道的底部延伸至相邻微透镜的下方的情况，该多个挡光层中的非底层挡光层在该多个微透镜中相邻的两个微透镜的后焦点的中间位置可以设置有开孔，那么该相邻的两个微透镜对应的两个导光通道均穿过该非底层挡光层中的该相邻的两个微透镜对应的开孔。In the embodiment of the present application, for the case where the bottoms of the multiple light guide channels corresponding to the same microlens extend below the adjacent microlenses, the non-bottom light-blocking layer of the multiple light-blocking layers is in the multiple microlens The middle position of the back focus of the two adjacent microlenses may be provided with an opening, so the two light guide channels corresponding to the two adjacent microlenses pass through the adjacent light-blocking layer. The two microlenses correspond to the openings.
例如，如图3和图7所示，对于第二微透镜212，该第一挡光层220在该第一微透镜211的后焦点和该第二微透镜212的后焦点的中间位置可以设置第二开孔222，并且该第一微透镜211和第二微透镜212各有一个导光通道会穿过该第二孔222；类似的，该第一挡光层220在该第三微透镜213的后焦点和该第二微透镜212的后焦点的中间位置可以设置有第三开孔223，并且该第三微透镜213和和第二微透镜212各有一个导光通道会穿过该第三开孔223。For example, as shown in FIGS. 3 and 7, for the second microlens 212, the first light-blocking layer 220 may be disposed at an intermediate position between the back focus of the first microlens 211 and the back focus of the second microlens 212 The second opening 222, and each of the first microlens 211 and the second microlens 212 has a light guide channel passing through the second hole 222; similarly, the first light blocking layer 220 is in the third microlens A third opening 223 may be provided in the middle of the back focus of the second microlens 213 and the back focus of the second microlens 212, and each of the third microlens 213 and the second microlens 212 has a light guide channel passing through the The third opening 223.
在另一些实现方式中，不同挡光层中的与同一微透镜对应的开孔的孔径由上至下还可以依次增加、或者减小或者不变，以筛选出该光学感应像素阵列240期望接收到的光信号。In other implementations, the apertures of the openings corresponding to the same microlens in different light-blocking layers can also be increased, decreased, or unchanged in order from top to bottom, so as to filter out the desired reception of the optical sensing pixel array 240. Light signal.
例如，如图7所示，对于自上而下的三层挡光层，上层的该第三挡光层260的开孔的孔径大于中间层的该第一挡光层220中的开孔的孔径，该中间层的第一挡光层220中的开孔的孔径大于下层的该第二挡光层230中的开孔的孔径。For example, as shown in FIG. 7, for a top-down three-layer light-blocking layer, the apertures of the third light-blocking layer 260 of the upper layer are larger than those of the first light-blocking layer 220 of the middle layer. The aperture, the aperture of the opening in the first light blocking layer 220 of the intermediate layer is larger than the aperture of the opening in the second light blocking layer 230 of the lower layer.
可选地，上述分别以该指纹检测单元20包括两层或者三层挡光层为例进行说明，类似的，该指纹检测单元20还可以包括更多层的挡光层，或者，该指纹检测单元20也可以仅包括一个挡光层，本申请实施例并不限于此。Optionally, the above description respectively takes the fingerprint detection unit 20 including two or three light blocking layers as an example for description. Similarly, the fingerprint detection unit 20 may also include more light blocking layers, or the fingerprint detection The unit 20 may also include only one light blocking layer, and the embodiment of the present application is not limited to this.
例如，对于该指纹检测单元20只包括一个挡光层的情况，此时该一个挡光层上可以设置有多个倾斜通孔，即任意一个微透镜的多个导光通道可以为该挡光层上与该微透镜对应的多个倾斜通孔。例如，该一个挡光层的厚度大于预设阈值，以使该每个微透镜下方设置的多个光学感应像素分别用于接收经由同一个微透镜汇聚或者经由其相邻的多个微透镜汇聚的并通过对应的导光通道传输的光信号。For example, in the case where the fingerprint detection unit 20 only includes one light-blocking layer, at this time, a plurality of inclined through holes may be provided on the light-blocking layer, that is, multiple light guide channels of any microlens may be the light blocking layer. A plurality of inclined through holes corresponding to the micro lens on the layer. For example, the thickness of the one light-blocking layer is greater than the preset threshold, so that the multiple optical sensing pixels arranged under each microlens are used to receive the convergence through the same microlens or through the multiple adjacent microlenses. The optical signal transmitted through the corresponding optical channel.
可选地，本申请实施例的指纹检测单元20还可以包括透明介质层250。其中，如图3、图4和图7所示，该透明介质层250可以设置在以下位置中的至少一处：该微透镜阵列210和该至少一个挡光层之间，该至少一个挡光层之间，以及该至少一个挡光层和光学感应像素阵列240之间。Optionally, the fingerprint detection unit 20 of the embodiment of the present application may further include a transparent medium layer 250. Wherein, as shown in FIG. 3, FIG. 4, and FIG. 7, the transparent medium layer 250 may be disposed at at least one of the following positions: between the microlens array 210 and the at least one light blocking layer, the at least one light blocking layer Between the layers, and between the at least one light blocking layer and the optical sensing pixel array 240.
例如，如图3和图4所示，该透明介质层250可以包括位于该微透镜阵列210和该至少一个挡光层(即该第一挡光层220)之间的第一介质层251以及该第一挡光层220和该第二挡光层230之间的第二介质层252。For example, as shown in FIGS. 3 and 4, the transparent medium layer 250 may include a first medium layer 251 located between the microlens array 210 and the at least one light blocking layer (ie, the first light blocking layer 220), and The second dielectric layer 252 between the first light blocking layer 220 and the second light blocking layer 230.
再例如，如图7所示，该透明介质层250可以包括：位于该微透镜阵列210和该至少一个挡光层(即该第三挡光层260)之间的第一介质层251以及三个挡光层之间的第二介质层252，其中，第二介质层252包括第三挡光层260和该第一挡光层220之间的第二介质层252以及该第一挡光层220和该第二挡光层230之间的第二介质层252。For another example, as shown in FIG. 7, the transparent medium layer 250 may include: a first medium layer 251 and three layers located between the microlens array 210 and the at least one light blocking layer (that is, the third light blocking layer 260). The second medium layer 252 between the two light blocking layers, wherein the second medium layer 252 includes the third light blocking layer 260 and the second medium layer 252 between the first light blocking layer 220 and the first light blocking layer The second dielectric layer 252 between 220 and the second light blocking layer 230.
透明介质层250的材料是对光透明的任一透明材料，例如玻璃，也可以是由空气或真空过渡，本申请对此不做具体限定。The material of the transparent medium layer 250 is any transparent material that is transparent to light, such as glass, which can also be transitioned by air or vacuum, which is not specifically limited in this application.
可选地，本申请实施例的指纹检测单元20还可以包括滤光层。图8是本申请实施例的指纹检测单元20的另一示意性结构图，如图8所示，该指纹检测单元20还可以包括滤光层270，该滤光层270可以设置在以下位置的至少一处：该微透镜阵列210的上方，该微透镜阵列210和该至少一个挡光层之间；该至少一个挡光层之间；以及该至少一个挡光层和光学感应像素阵列240之间。例如，该滤光层270可以设置在该光学感应像素阵列240和该第二挡光层230之间。例如，该滤光层270可以是上文涉及的光学组件132中的滤光层。Optionally, the fingerprint detection unit 20 of the embodiment of the present application may further include a filter layer. FIG. 8 is another schematic structural diagram of the fingerprint detection unit 20 according to an embodiment of the present application. As shown in FIG. 8, the fingerprint detection unit 20 may further include a filter layer 270, which may be arranged in the following position At least one place: above the microlens array 210, between the microlens array 210 and the at least one light blocking layer; between the at least one light blocking layer; and between the at least one light blocking layer and the optical sensing pixel array 240 between. For example, the filter layer 270 may be disposed between the optical sensing pixel array 240 and the second light blocking layer 230. For example, the filter layer 270 may be the filter layer in the optical component 132 mentioned above.
滤光层270可以用于减少指纹感应中的不期望的环境光，以提高该光学感应像素阵列240对接收到的光的光学感应。滤光层270具体可以用于过滤掉特定波长的光，例如，近红外光和部分的红光等。例如，人类手指吸收波长低于580nm的光的能量中的大部分，如果一个或多个光学过滤器或光学过滤层被设计为过滤波长从580nm至红外的光，则可以大大减少环境光对指纹感应中的光学检测的影响。The filter layer 270 can be used to reduce undesired ambient light in fingerprint sensing, so as to improve the optical sensing of the optical sensing pixel array 240 to the received light. The filter layer 270 may specifically be used to filter out light of a specific wavelength, for example, near-infrared light and part of red light. For example, human fingers absorb most of the energy of light with a wavelength below 580nm. If one or more optical filters or optical filter layers are designed to filter light with wavelengths from 580nm to infrared, it can greatly reduce the impact of ambient light on fingerprints. The influence of optical detection in induction.
例如，该滤光层270可以包括一个或多个光学过滤器，一个或多个光学过滤器可以配置为例如带通过滤器，以允许OLED屏发射的光的传输，同时阻挡太阳光中的红外光等其他光组分。当在室外使用屏下该指纹检测单元20时，这种光学过滤可以有效地减少由太阳光造成的背景光。一个或多个光学过滤器可以实现为例如光学过滤涂层，光学过滤涂层形成在一个或多个连续界面上，或可以实现为一个或多个离散的界面上。应理解，滤光层270可以制作在沿着到经由手指反射形成的反射光至成该光学感应像素阵列240的光学路径的任一位置上，本申请实施例对此不做具体限定。For example, the filter layer 270 may include one or more optical filters, and the one or more optical filters may be configured as, for example, band-pass filters to allow transmission of light emitted by the OLED screen while blocking infrared light in sunlight. And other light components. When the fingerprint detection unit 20 is used outdoors, this kind of optical filtering can effectively reduce the background light caused by sunlight. One or more optical filters may be implemented as, for example, an optical filter coating formed on one or more continuous interfaces, or may be implemented as one or more discrete interfaces. It should be understood that the filter layer 270 can be formed at any position along the optical path from the reflected light formed by the reflection of the finger to the optical sensing pixel array 240, which is not specifically limited in the embodiment of the present application.
此外，该滤光层270的进光面可以设置有光学无机镀膜或有机黑化涂层，以使得滤光层270的进光面的反射率低于第一阈值，例如1％，从而能够保证该光学感应像素阵列240能够接收到足够的光信号，进而提升指纹识别效果。In addition, the light entrance surface of the filter layer 270 may be provided with an optical inorganic coating or an organic blackened coating, so that the reflectance of the light entrance surface of the filter layer 270 is lower than a first threshold, such as 1%, so as to ensure The optical sensing pixel array 240 can receive enough light signals to improve the fingerprint recognition effect.
以该滤光层270通过固定装置固定在光学感应像素阵列240的上表面为例。该滤光层270和该光学感应像素阵列240可以在该光学感应像素阵列240的非感光区域进行点胶固定，且该滤光层270和该光学感应像素阵列240的感光区域之间存在间隙。或者该滤光层270的下表面通过折射率低于预设折射率的胶水固定在该光学感应像素阵列240的上表面，例如，该预设折射率包括但不限于1.3。Take the filter layer 270 fixed on the upper surface of the optical sensing pixel array 240 by a fixing device as an example. The filter layer 270 and the optical sensing pixel array 240 can be glued and fixed in the non-sensitive area of the optical sensing pixel array 240, and there is a gap between the filter layer 270 and the photosensitive area of the optical sensing pixel array 240. Or the lower surface of the filter layer 270 is fixed to the upper surface of the optical sensing pixel array 240 by glue with a refractive index lower than a predetermined refractive index. For example, the predetermined refractive index includes but is not limited to 1.3.
因此，本申请实施例的指纹检测装置包括多个指纹检测单元，每个指纹检测单元基于以上技术方案进行设置，可以至少解决以下技术问题：1、垂直光信号对干手指的识别效果过差的问题；2、单物方远心微透镜阵列方案曝光时间过长的问题；3、指纹检测装置的厚度过大的问题；4、指纹检测装置的公差容忍度过差的问题；5、指纹检测装置尺寸过大的问题。Therefore, the fingerprint detection device of the embodiment of the present application includes multiple fingerprint detection units, and each fingerprint detection unit is set based on the above technical solution, which can at least solve the following technical problems: 1. The recognition effect of the vertical light signal on dry fingers is too poor Problems; 2. The long exposure time of the single-object telecentric microlens array solution; 3. The thickness of the fingerprint detection device is too large; 4. The tolerance tolerance of the fingerprint detection device is too poor; 5. Fingerprint detection The size of the device is too large.
针对问题1，通过为每个微透镜设计多个导光通道，并且使得该每个微透镜对应的多个导光通道中每个导光通道与其对应的微透镜的光轴之间的 夹角小于90°，对应的，每个微透镜下的多个光学感应像素分别能够接收到来自同一个微透镜或者多个相邻的微透镜汇聚的并通过对应的导光通道传输的倾斜光信号，从而实现利用倾斜光信号检测干手指的指纹信息。当干手指纹与OLED屏接触不好时，垂直方向的指纹图像的指纹脊和指纹谷的对比度差，图像模糊到分辨不了指纹纹路，本申请通过合理的光路设计，让光路接收倾斜方向光信号，在能够较好的获取正常手指指纹的同时，可以更好的检测出干手指指纹图像。在正常生活场景下，例如洗完手、早晨起床、手指抹灰、低温等场景下手指通常较干，其角质层不均匀，其按压在OLED屏上时，手指局部区域会出现接触不良。这种情况的出现造成当前光学指纹方案对干手指纹识别的效果不好，本申请的有益效果就是提升干手指纹成像效果，让干手指纹图像变清晰。For problem 1, by designing multiple light guide channels for each microlens, and make the angle between each light guide channel and the optical axis of the corresponding microlens in the multiple light guide channels corresponding to each microlens If less than 90°, correspondingly, the multiple optical sensing pixels under each microlens can respectively receive the oblique light signal from the same microlens or multiple adjacent microlenses and transmitted through the corresponding light guide channel. So as to realize the use of oblique light signal to detect fingerprint information of dry fingers. When the dry hand fingerprint is not in contact with the OLED screen, the contrast between the fingerprint ridge and the fingerprint valley of the fingerprint image in the vertical direction is poor, and the image is blurred to the point where the fingerprint lines cannot be distinguished. This application uses a reasonable optical path design to allow the optical path to receive light signals in oblique directions , While it can better obtain normal finger fingerprints, it can better detect dry finger fingerprint images. In normal life scenarios, such as washing hands, getting up in the morning, plastering fingers, low temperature and other scenes, the fingers are usually dry, and the stratum corneum is uneven. When it is pressed on the OLED screen, local areas of the fingers will have poor contact. The occurrence of this situation causes the current optical fingerprint solution to have a poor effect on dry hand fingerprint recognition. The beneficial effect of this application is to improve the dry hand fingerprint imaging effect and make the dry hand fingerprint image clearer.
此外，该光学感应像素阵列240通过接收倾斜光信号还能够扩大该光学感应像素阵列240的视场角和视场，例如，能够接收倾斜光的指纹检测单元20的视场可以由6x9mm 2扩展到7.5x10.5mm 2，进一步提升指纹识别效果。 In addition, the optical sensing pixel array 240 can also expand the field of view and the field of view of the optical sensing pixel array 240 by receiving the oblique light signal. For example, the field of view of the fingerprint detection unit 20 capable of receiving oblique light can be expanded from 6x9mm 2 to 7.5x10.5mm 2 , further enhance the fingerprint recognition effect.
并且，每个微透镜下方设置有多个光学感应像素，使得透镜阵列210的空间周期和光学感应像素阵列240的空间周期不相等，进而能够避免指纹图像中出现莫尔条纹并提升指纹识别效果。In addition, a plurality of optical sensing pixels are arranged under each microlens, so that the spatial period of the lens array 210 and the spatial period of the optical sensing pixel array 240 are not equal, thereby avoiding moiré fringes in the fingerprint image and improving the fingerprint recognition effect.
针对问题2，通过为每个微透镜设计多个导光通道，并且每个导光通道都对应有光学感应像素，以接收通过导光通道的光信号，也就是可以形成单个微透镜与多光学感应像素搭配的成像光路。即通过单个微透镜可以复用多个角度的光信号(例如，如图5或者图6所示，通过单个微透镜可以复用4个角度的光信号)，由此可以对不同的物方孔径角的光束进行分割成像，有效提高了每个指纹检测单元的进光量，也就提升了指纹检测装置的进光量，由此可以降低光学感应像素阵列的曝光时长。需要说明的是，孔径角是微透镜光轴上的物体点与微透镜的前透镜的有效直径所形成的角度，微透镜的孔径角越大，微透镜的进光量就越大，其与微透镜的有效直径成正比，与焦点的距离成反比。Aiming at problem 2, by designing multiple light guide channels for each microlens, and each light guide channel corresponds to an optical sensor pixel to receive the light signal passing through the light guide channel, that is, a single microlens and multiple optics can be formed The imaging light path with sensor pixel matching. That is, a single microlens can multiplex the optical signals of multiple angles (for example, as shown in Figure 5 or Figure 6, the optical signals of 4 angles can be multiplexed by a single microlens), so that different object apertures can be multiplexed. The angled beam is divided and imaged, which effectively increases the light input of each fingerprint detection unit, which also increases the light input of the fingerprint detection device, thereby reducing the exposure time of the optical sensor pixel array. It should be noted that the aperture angle is the angle formed by the object point on the optical axis of the microlens and the effective diameter of the front lens of the microlens. The larger the aperture angle of the microlens, the greater the light input of the microlens. The effective diameter of the lens is proportional and inversely proportional to the distance of the focal point.
具体而言，由于每个微透镜下的多个光学感应像素分别能够接收对应的导光通道传输的倾斜光信号，因此按照导光通道的方向，可以将该光学感应像素阵列划分为多个光学感应像素组，其中每个光学感应像素组中的每个光学感应像素用于接收方向与同一光学感应像素组对应的导光通道的方向相 同的倾斜光信号，即每个光学感应像素组可以基于接收到的倾斜光信号生成一张指纹图像，由此该多个光学感应像素组可以用于生成多张指纹图像，在这种情况下，可以将该多张指纹图像进行叠加，以获取一张高分辨率的指纹图像，进而基于这张高分辨率的指纹图像进行指纹识别。Specifically, since the multiple optical sensing pixels under each microlens can respectively receive the oblique light signal transmitted by the corresponding light guide channel, the optical sensing pixel array can be divided into multiple optical sensing pixels according to the direction of the light guide channel. The sensing pixel group, where each optical sensing pixel in each optical sensing pixel group is used to receive oblique light signals whose direction is the same as the direction of the light guide channel corresponding to the same optical sensing pixel group, that is, each optical sensing pixel group can be based on The received oblique light signal generates a fingerprint image, so the multiple optical sensing pixel groups can be used to generate multiple fingerprint images. In this case, the multiple fingerprint images can be superimposed to obtain one fingerprint image. The high-resolution fingerprint image is then used for fingerprint recognition based on this high-resolution fingerprint image.
结合图5或者图6来说，该光学感应像素阵列240可以通过每个微透镜对应的4个导光通道分别向4个光学感应像素汇聚倾斜光信号，即该光学感应像素阵列240可以划分为4个光学感应像素组，用于形成4张指纹图像，基于这4张指纹图像可以获取一张分辨率较高的指纹图像，进而提升指纹识别效果。With reference to FIG. 5 or FIG. 6, the optical sensing pixel array 240 can respectively converge oblique light signals to the four optical sensing pixels through the four light guide channels corresponding to each microlens, that is, the optical sensing pixel array 240 can be divided into The 4 optical sensor pixel groups are used to form 4 fingerprint images. Based on these 4 fingerprint images, a fingerprint image with higher resolution can be obtained, thereby improving the fingerprint recognition effect.
由此可见，由于每个微透镜可以通过多个导光通道向多个方向汇聚倾斜光信号，或者说该光学感应像素阵列可以通过光路设计同时获取多张指纹图像，因此即使降低该光学感应像素阵列的曝光时长，进而导致每张指纹图像的分辨率较低，也可以通过对分辨率较低的多张指纹图像进行处理，进而获得一张分辨率较高的指纹图像。It can be seen that since each microlens can converge oblique light signals in multiple directions through multiple light guide channels, or the optical sensor pixel array can simultaneously acquire multiple fingerprint images through the optical path design, even if the optical sensor pixel is reduced The exposure time of the array results in a lower resolution of each fingerprint image. It is also possible to process multiple fingerprint images with lower resolution to obtain a fingerprint image with higher resolution.
也就是说，基于上述技术方案，可以保证指纹识别效果的同时降低该光学感应像素阵列240(即图像传感器)的曝光时长。In other words, based on the above technical solution, the fingerprint recognition effect can be guaranteed while reducing the exposure time of the optical sensing pixel array 240 (ie, the image sensor).
针对问题3，通过单个微透镜与多光学感应像素搭配的成像光路可以对屏下指纹的物方光束进行非正对光成像(即倾斜光成像)，尤其是每个微透镜下方设置的多个光学感应像素分别用于接收经由相邻的多个微透镜汇聚的光信号，由此能够扩大光学***的物方数值孔径并缩短该光学感应像素阵列的光路设计(即该至少一个挡光层)的厚度，最终能够有效降低每个指纹检测单元的厚度，也就降低了该指纹检测装置的厚度。Aiming at problem 3, the imaging light path of a single microlens and multiple optical sensing pixels can perform non-frontal light imaging (ie oblique light imaging) of the object beam of the fingerprint under the screen, especially the multiple set under each microlens The optical sensing pixels are respectively used to receive the light signals converged by a plurality of adjacent microlenses, thereby being able to enlarge the object-side numerical aperture of the optical system and shorten the optical path design of the optical sensing pixel array (that is, the at least one light blocking layer) In the end, the thickness of each fingerprint detection unit can be effectively reduced, which reduces the thickness of the fingerprint detection device.
针对问题4，通过单个微透镜与多光学感应像素搭配的成像光路可以对屏下指纹的物方光束进行非正对光成像，能够扩大光学***的物方数值孔径，进而提高***的鲁棒性以及指纹检测单元20的公差容忍度。其中数值孔径可以是微透镜的前透镜与被检物体之间介质的折射率(h)和孔径角(u)半数的正弦的乘积。Aiming at problem 4, the imaging light path with a single microlens and multiple optical sensing pixels can perform non-frontal light imaging of the object beam of the fingerprint under the screen, which can expand the object numerical aperture of the optical system and improve the robustness of the system And the tolerance tolerance of the fingerprint detection unit 20. The numerical aperture may be the product of the refractive index (h) of the medium between the front lens of the micro lens and the object to be inspected and the sine of the half of the aperture angle (u).
针对问题5，通过单个微透镜与多光学感应像素搭配的成像光路和该至少一个挡光层中设置的导光通道，可以在保证相邻两个光学感应像素不相互影响的情况下提升该光学感应像素阵列240中的光学感应像素的密度，进而能够降低每个指纹检测单元的尺寸，也就降低了该指纹检测装置的尺寸。Aiming at problem 5, through the imaging light path of a single microlens and multiple optical sensing pixels and the light guide channel provided in the at least one light blocking layer, the optical sensor can be improved without affecting the two adjacent optical sensing pixels. The density of the optical sensing pixels in the sensing pixel array 240 can further reduce the size of each fingerprint detection unit, which also reduces the size of the fingerprint detection device.
由上可知，本申请的技术方案通过对每个微透镜对应的多个导光通道的合理设计，可以使得光学感应像素阵列240只接收倾斜角度的光信号，并通过单个微透镜汇聚多个角度的倾斜光信号，解决了单物方远心微透镜阵列方案曝光时间过长的问题。换句话说，该指纹检测单元20不仅能够解决垂直光信号对干手指的识别效果过差的问题以及单物方远心微透镜阵列方案曝光时间过长的问题，还能够解决包括多个指纹检测单元的指纹检测装置的厚度过大、公差容忍度过差以及尺寸过大的问题。It can be seen from the above that the technical solution of the present application can make the optical sensing pixel array 240 only receive the light signal of the oblique angle through a reasonable design of the multiple light guide channels corresponding to each microlens, and converge multiple angles through a single microlens. The oblique light signal solves the problem of too long exposure time for the single-object telecentric microlens array scheme. In other words, the fingerprint detection unit 20 can not only solve the problem of poor recognition of dry fingers by the vertical light signal and the long exposure time of the single-object telecentric microlens array solution, but also solve the problem of multiple fingerprint detections. The fingerprint detection device of the unit is too thick, tolerance tolerance is too poor, and size is too large.
在本申请实施例中，指纹检测装置中包括多个指纹检测单元，每个指纹检测单元可以接收多个不同方向的倾斜光，例如，上述如图3至图8的指纹检测单元20可以接收四个不同的斜方向的光，每个方向的倾斜角度可以相同，也可以不同。In the embodiment of the present application, the fingerprint detection device includes multiple fingerprint detection units, and each fingerprint detection unit can receive multiple oblique lights in different directions. For example, the fingerprint detection unit 20 shown in FIGS. 3 to 8 can receive four For light in different oblique directions, the inclination angle of each direction can be the same or different.
假设屏下的指纹检测装置中仅包括一个指纹检测单元，该指纹检测单元可以用于接收多个方向的倾斜的光，此时，该单个指纹检测单元的有效的成像视场将会在其垂直方向向外偏移一定的距离。例如，图9示出了单个指纹检测单元的视场的示意图，如图9所示，电子设备包括显示屏310，该显示屏310的下方包括单个指纹检测单元，假设该单个指纹检测单元为上述图3至图8中的指纹检测单元20，其可以接收四个不同的斜方向的光。如图9所示，由于该指纹检测单元可以接收倾斜方向上的光，所以该指纹检测单元的上表面的尺寸(或者说该指纹检测单元的视场)会小于显示屏310上方指纹检测区域311的有效区域的面积，也就是说，整个指纹检测单元的尺寸相对于在显示屏310上的指纹检测区域311的视场范围会往该指纹检测单元的边沿外扩ΔL的视场。其中，显示屏310中包括的指纹检测区域311用于为用户进行指纹识别提供触摸界面，其有效面积也可以称为该指纹检测单元在指纹检测区域311的视场，或者称为该指纹检测区域311的视场，其指的是手指触摸进行指纹识别时的有效触摸的范围。应理解，该外扩的视场与屏上表面和指纹检测单元的上表面之间的距离成正比。Assuming that the fingerprint detection device under the screen includes only one fingerprint detection unit, the fingerprint detection unit can be used to receive oblique light in multiple directions. At this time, the effective imaging field of view of the single fingerprint detection unit will be at its vertical The direction is offset by a certain distance. For example, FIG. 9 shows a schematic diagram of the field of view of a single fingerprint detection unit. As shown in FIG. 9, the electronic device includes a display screen 310. The bottom of the display screen 310 includes a single fingerprint detection unit. The fingerprint detection unit 20 in FIG. 3 to FIG. 8 can receive light in four different oblique directions. As shown in FIG. 9, since the fingerprint detection unit can receive light in an oblique direction, the size of the upper surface of the fingerprint detection unit (or the field of view of the fingerprint detection unit) will be smaller than the fingerprint detection area 311 above the display screen 310. The area of the effective area, that is, the size of the entire fingerprint detection unit relative to the field of view of the fingerprint detection area 311 on the display screen 310 will expand the field of view by ΔL from the edge of the fingerprint detection unit. Wherein, the fingerprint detection area 311 included in the display screen 310 is used to provide a touch interface for the user to perform fingerprint identification, and its effective area can also be referred to as the field of view of the fingerprint detection unit in the fingerprint detection area 311, or the fingerprint detection area The field of view of 311 refers to the effective touch range when a finger touches for fingerprint recognition. It should be understood that the expanded field of view is proportional to the distance between the upper surface of the screen and the upper surface of the fingerprint detection unit.
具体地，图10示出了本申请实施例的单个指纹检测单元的视场范围计算方式的示意图，如图10所示，整个指纹检测单元20的尺寸相对于在显示屏310上的指纹检测区域311的视场范围会往该指纹检测单元的边沿外扩ΔL的视场，该ΔL可以通过下面的公式(1)计算：Specifically, FIG. 10 shows a schematic diagram of the method of calculating the field of view of a single fingerprint detection unit according to an embodiment of the present application. As shown in FIG. 10, the size of the entire fingerprint detection unit 20 is relative to the fingerprint detection area on the display screen 310. The field of view of 311 will extend the field of view of ΔL to the edge of the fingerprint detection unit. The ΔL can be calculated by the following formula (1):
ΔL＝h 1 tanθ 1+h 2 tanθ 2   (1) ΔL=h 1 tanθ 1 +h 2 tanθ 2 (1)
其中，如图10所示，h 1为显示屏310的厚度；θ 1为光线在显示屏310内传播的偏转角度；h 2为指纹检测单元20与显示屏310之间的间隙的厚度；θ 2为光线在该间隙内传播的偏转角度，例如，该间隙内为空气时，该θ 2为光线在空气中传播的偏转角度。可选地，该θ 1和θ 2满足公式n 1 sinθ 1＝n 2 sinθ 2，n 1表示显示屏310的折射率，n 2表示指纹检测单元20与显示屏310之间的间隙的折射率，例如，若该间隙为空气，则该n 2表示空气折射率。 Wherein, as shown in FIG. 10, h 1 is the thickness of the display screen 310; θ 1 is the deflection angle of light propagating in the display screen 310; h 2 is the thickness of the gap between the fingerprint detection unit 20 and the display screen 310; θ 2 is the deflection angle of the light propagating in the gap. For example, when the gap is air, the θ 2 is the deflection angle of the light propagating in the air. Optionally, the θ 1 and θ 2 satisfy the formula n 1 sinθ 1 =n 2 sinθ 2 , n 1 represents the refractive index of the display screen 310, and n 2 represents the refractive index of the gap between the fingerprint detection unit 20 and the display screen 310 For example, if the gap is air, the n 2 represents the refractive index of air.
例如，假设指纹检测单元接收的四个不同的斜方向的光，每个方向在空气中的角度均是40°，显示屏310为OLED屏，其厚度为1.4mm。此时，指纹检测单元20安装在显示屏310下方时，通过调节指纹检测单元20与显示屏310之间的距离，指纹检测单元外扩的视场可以调整为ΔL＝0.75mm。For example, assuming that the fingerprint detection unit receives four different oblique directions of light, the angle of each direction in the air is 40°, and the display screen 310 is an OLED screen with a thickness of 1.4 mm. At this time, when the fingerprint detection unit 20 is installed below the display screen 310, by adjusting the distance between the fingerprint detection unit 20 and the display screen 310, the expanded field of view of the fingerprint detection unit can be adjusted to ΔL=0.75 mm.
通常情况下，该指纹检测单元的芯片越小，其外扩的视场比率越大。例如，假设一个指纹检测单元的最小的尺寸为2.3mmx2.3mm，该尺寸可以为互补金属氧化物半导体(Complementary Metal Oxide Semiconductor，CMOS)光敏感区域的尺寸，那么经过该指纹检测单元的光路涉及，会将其视场有效区域扩展到3.8mm*3.8mm，整个视场区域扩展到了接近2.7倍。Under normal circumstances, the smaller the chip of the fingerprint detection unit, the larger the field of view ratio. For example, assuming that the smallest size of a fingerprint detection unit is 2.3mmx2.3mm, this size can be the size of a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) light sensitive area, then the light path through the fingerprint detection unit involves, The effective area of its field of view will be extended to 3.8mm*3.8mm, and the entire field of view area will be extended to nearly 2.7 times.
根据屏下指纹的使用经验，通常屏下光学指纹的有效面积大于等于6mmx6mm的有效视场，其识别效果较好，也就是说，显示屏310中包括的指纹检测区域311的有效面积通常大于或者等于6mmx6mm，该指纹检测区域311用于为用户进行指纹识别提供触摸界面。为了用尽量小的芯片面积得到尽量多的视场，因此，本申请实施例提供了一种指纹检测装置，通过将多个指纹检测单元进行物理拼接，实现更大的视场。According to the experience of using fingerprints under the screen, usually the effective area of the optical fingerprint under the screen is greater than or equal to the effective field of view of 6mmx6mm, and its recognition effect is better, that is, the effective area of the fingerprint detection area 311 included in the display screen 310 is usually greater than or Equal to 6mmx6mm, the fingerprint detection area 311 is used to provide a touch interface for the user to perform fingerprint identification. In order to obtain as much field of view as possible with the smallest possible chip area, an embodiment of the present application provides a fingerprint detection device, which realizes a larger field of view by physically splicing multiple fingerprint detection units.
具体地，本申请实施例的指纹检测装置包括多个指纹检测单元，图11示出了本申请实施例的电子设备300的示意图，如图11所示，该电子设备300包括显示屏310，该显示屏310包括指纹检测区域311，用于为用户进行指纹识别提供触摸界面，该显示屏310下方设置有指纹检测装置，该指纹检测装置包括多个指纹检测单元，例如，该多个指纹检测单元中任意一个指纹检测单元可以为上述指纹检测单元20。Specifically, the fingerprint detection apparatus of the embodiment of the present application includes multiple fingerprint detection units. FIG. 11 shows a schematic diagram of the electronic device 300 of the embodiment of the present application. As shown in FIG. 11, the electronic device 300 includes a display screen 310. The display screen 310 includes a fingerprint detection area 311 for providing a touch interface for the user to perform fingerprint identification. A fingerprint detection device is provided under the display screen 310. The fingerprint detection device includes multiple fingerprint detection units, for example, the multiple fingerprint detection units Any one of the fingerprint detection units may be the aforementioned fingerprint detection unit 20.
具体地，该多个指纹检测单元中每个指纹检测单元的尺寸以及相邻两个指纹检测单元之间的距离为根据尺寸参数设置的，该尺寸参数包括以下参数中的至少一个：该每个指纹检测单元的视场范围(即包括指纹检测单元能够外扩的视场的总面积)、该指纹检测区域的面积、该显示屏的厚度以及该每 个指纹检测单元的光路上表面至该显示屏的上表面的距离。Specifically, the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to a size parameter, and the size parameter includes at least one of the following parameters: The field of view of the fingerprint detection unit (that is, the total area including the field of view that the fingerprint detection unit can expand), the area of the fingerprint detection area, the thickness of the display screen, and the optical path surface of each fingerprint detection unit to the display The distance from the top surface of the screen.
应理解，本申请实施例中的指纹检测装置中包括的多个指纹检测单元的结构或者尺寸可以相同，也可以不同。具体地，该多个指纹检测单元中任意一个指纹检测单元均可以为上述图3至图8的指纹检测单元20，但是该多个指纹检测单元可以为结构相同或者不同的指纹检测单元，同时也可以为尺寸大小相同或者不同的指纹检测单元。例如，为了便于生产加工，该多个指纹检测单元的结构和尺寸均可以设置为完全相同，比如该多个指纹检测单元均可以为如图3或者图7所示的指纹检测单元20，但本申请实施例并不限于此。It should be understood that the structures or sizes of the multiple fingerprint detection units included in the fingerprint detection device in the embodiment of the present application may be the same or different. Specifically, any one of the plurality of fingerprint detection units may be the fingerprint detection unit 20 of FIG. 3 to FIG. 8, but the plurality of fingerprint detection units may be fingerprint detection units with the same or different structures, and also It can be fingerprint detection units with the same size or different sizes. For example, in order to facilitate production and processing, the structures and sizes of the multiple fingerprint detection units can be set to be completely the same. For example, the multiple fingerprint detection units can all be the fingerprint detection unit 20 shown in FIG. 3 or FIG. The application embodiment is not limited to this.
在本申请实施例中，指纹检测装置中包括的多个指纹检测单元可以排列为n*m的矩阵，n和m为正整数。其中，该多个指纹检测单元中位于同一行的多个指纹检测单元的间隔距离相等；和/或，该多个指纹检测单元中位于同一列的多个指纹检测单元的间隔距离相等。In the embodiment of the present application, the multiple fingerprint detection units included in the fingerprint detection device may be arranged in an n*m matrix, and n and m are positive integers. Wherein, the plurality of fingerprint detection units in the same row of the plurality of fingerprint detection units have the same separation distance; and/or, the plurality of fingerprint detection units in the same column of the plurality of fingerprint detection units have the same separation distance.
可选地，下面将结合具体实施例详细描述本申请实施例的多个指纹检测单元的排列方式。Optionally, the arrangement of multiple fingerprint detection units in the embodiments of the present application will be described in detail below in conjunction with specific embodiments.
可选地，作为第一个实施例，该指纹检测装置包括的多个指纹检测单元的个数可以为两个。Optionally, as a first embodiment, the number of multiple fingerprint detection units included in the fingerprint detection device may be two.
可选地，两个指纹检测单元可以左右并排设置，还可以上下并排设置。例如，图12示出了本申请实施例的两个指纹检测单元的设置方式的示意图。如图12所示，这里假设将两个矩形的指纹检测单元左右并排方式，其中，每个指纹检测单元可以为上述图3至图8所示的指纹检测单元20。Optionally, the two fingerprint detection units can be arranged side by side on the left and right, and can also be arranged side by side up and down. For example, FIG. 12 shows a schematic diagram of the arrangement of two fingerprint detection units in an embodiment of the present application. As shown in FIG. 12, it is assumed here that two rectangular fingerprint detection units are arranged side by side, where each fingerprint detection unit may be the fingerprint detection unit 20 shown in FIGS. 3 to 8 above.
具体地，如图12所示，这里将该指纹检测单元的宽度表示为W，长度表示为H，两个指纹检测单元之间的水平距离表示为G，该图12中的两个指纹检测单元***的矩形方框可以表示指纹检测区域的有效范围，其大于指纹检测单元的面积。可选地，该指纹检测区域的实际面积可能大于其有效范围，该有效范围表示能够用于指纹识别的最小面积，例如，该指纹检测区域内还可以设置有其他功能区域，本申请实施例并不限于此。Specifically, as shown in Figure 12, the width of the fingerprint detection unit is represented as W, the length is represented as H, and the horizontal distance between the two fingerprint detection units is represented as G. The two fingerprint detection units in Figure 12 The outer rectangular box may indicate the effective range of the fingerprint detection area, which is larger than the area of the fingerprint detection unit. Optionally, the actual area of the fingerprint detection area may be larger than its effective range, and the effective range represents the smallest area that can be used for fingerprint recognition. For example, other functional areas may also be provided in the fingerprint detection area. Not limited to this.
应理解，如图12所示，根据每个指纹检测单元在显示屏的上表面的视场范围的大小，在设置两个指纹检测单元的情况下，通过合理设置W、H和G的大小，可以使其满足指纹检测区域的有效面积尺寸的要求。It should be understood that, as shown in FIG. 12, according to the size of the field of view of each fingerprint detection unit on the upper surface of the display screen, when two fingerprint detection units are provided, by reasonably setting the sizes of W, H, and G, It can meet the requirement of effective area size of fingerprint detection area.
具体地，在该尺寸参数包括：该每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少第一值X(即ΔL大于或者 等于该第一值X)、以及该指纹检测区域的长度大于或者等于第二值Y、以及该指纹检测区域的宽度大于或者等于第三值Z的情况下，那么参照图12，对应的可以设置如下参数：每个指纹检测单元的长度H大于或者等于Y-2X，该每个指纹检测单元的宽度W大于或者等于0.5Z-2X，该两个指纹检测单元之间的水平距离G小于或者等于2X。Specifically, the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least a first value X (that is, ΔL is greater than or equal to the first value X). Value X), and the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, then referring to FIG. 12, the following parameters can be set accordingly: The length H of each fingerprint detection unit is greater than or equal to Y-2X, the width W of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance G between the two fingerprint detection units is less than or equal to 2X.
例如，假设尺寸参数包括：每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少0.75mm(即ΔL大于或者等于0.75mm)、以及该指纹检测区域的面积大于或者等于6mm*6mm，那么参照图12，对应的可以设置如下参数：每个指纹检测单元的长度H大于或者等于4.5mm，每个指纹检测单元的宽度W大于或者等于1.5mm，该两个指纹检测单元之间的水平距离G小于或者等于1.5mm。例如，每个指纹检测单元的长度H设置为6mm，每个指纹检测单元的宽度W设置为2.3mm，该两个指纹检测单元之间的水平距离G设置为1mm，那么按照上述参数设置，对应的指纹识别区域有效视场或者说有效面积为7.1mm*7.5mm。For example, suppose that the size parameters include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.75mm (that is, ΔL is greater than or equal to 0.75mm), and the fingerprint detection If the area of the region is greater than or equal to 6mm*6mm, then referring to Figure 12, the following parameters can be set accordingly: the length H of each fingerprint detection unit is greater than or equal to 4.5mm, and the width W of each fingerprint detection unit is greater than or equal to 1.5mm, The horizontal distance G between the two fingerprint detection units is less than or equal to 1.5 mm. For example, the length H of each fingerprint detection unit is set to 6mm, the width W of each fingerprint detection unit is set to 2.3mm, and the horizontal distance G between the two fingerprint detection units is set to 1mm, then according to the above parameter settings, the corresponding The effective field of view or effective area of fingerprint recognition area is 7.1mm*7.5mm.
再例如，假设尺寸参数包括：每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少0.6mm(即ΔL大于或者等于0.6mm)、以及该指纹检测区域的面积大于或者等于6mm*6mm，那么参照图12，对应的可以设置如下参数：每个指纹检测单元的长度H大于或者等于4.8mm，每个指纹检测单元的宽度W大于或者等于1.8mm，该两个指纹检测单元之间的水平距离G小于或者等于1.2mm。例如，每个指纹检测单元的长度H设置为6.5mm，每个指纹检测单元的宽度W设置为2.6mm，该两个指纹检测单元之间的水平距离G设置为1mm，那么按照上述参数设置，对应的指纹识别区域有效视场或者说有效面积为7.4mm*7.7mm。For another example, suppose that the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.6mm outside the edge of each fingerprint detection unit (that is, ΔL is greater than or equal to 0.6mm), and the fingerprint The area of the detection area is greater than or equal to 6mm*6mm, then referring to Figure 12, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit is greater than or equal to 4.8mm, and the width W of each fingerprint detection unit is greater than or equal to 1.8mm , The horizontal distance G between the two fingerprint detection units is less than or equal to 1.2 mm. For example, the length H of each fingerprint detection unit is set to 6.5mm, the width W of each fingerprint detection unit is set to 2.6mm, and the horizontal distance G between the two fingerprint detection units is set to 1mm, then according to the above parameter settings, The effective field of view or effective area of the corresponding fingerprint recognition area is 7.4mm*7.7mm.
再例如，假设尺寸参数包括：每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少0.3mm(即ΔL大于或者等于0.3mm)、以及该指纹检测区域的面积大于或者等于6mm*6mm，那么参照图12，对应的可以设置如下参数：每个指纹检测单元的长度H大于或者等于5.4mm，每个指纹检测单元的宽度W大于或者等于2.4mm，该两个指纹检测单元之间的水平距离G小于或者等于0.6mm。For another example, suppose that the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3mm outside the edge of each fingerprint detection unit (that is, ΔL is greater than or equal to 0.3mm), and the fingerprint The area of the detection area is greater than or equal to 6mm*6mm, then referring to Figure 12, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit is greater than or equal to 5.4mm, and the width W of each fingerprint detection unit is greater than or equal to 2.4mm , The horizontal distance G between the two fingerprint detection units is less than or equal to 0.6 mm.
应理解，每个指纹检测单元在显示屏的上表面的视场范围相对于该每个指纹检测单元的边沿外扩的距离ΔL，可以根据公式(1)，通过参数h 1、h 2、 θ 1和θ 2进行确定，并且该ΔL的范围可以根据实际应用进行设置，例如，可以设置上述的0.6mm或者0.75mm，或者也可以设置为更大或者更小的数值，例如，通常将ΔL设置为大于或者等于0.3mm。例如，假设显示屏的厚度h 1为1.4mm，光线在空气中传播的偏转角度θ 2为40°，通过调整指纹检测单元的光路上表面至该显示屏的垂直距离h 2，可以使得ΔL达到0.6mm，或者达到0.75mm；再例如，假设每个指纹检测单元的光路上表面至该显示屏的上表面的垂直距离h 1+h 2为1.6mm，光线在空气中传播的偏转角度θ 2为20°，也可以使得ΔL达到0.6mm。 It should be understood that the extended distance ΔL of the field of view of each fingerprint detection unit on the upper surface of the display screen relative to the edge of each fingerprint detection unit can be determined by the parameters h 1 , h 2 , θ according to formula (1) 1 and θ 2 are determined, and the range of ΔL can be set according to actual applications. For example, the above-mentioned 0.6mm or 0.75mm can be set, or it can be set to a larger or smaller value. For example, ΔL is usually set It is greater than or equal to 0.3mm. For example, assuming that the thickness h 1 of the display screen is 1.4mm, and the deflection angle θ 2 of light propagating in the air is 40°, by adjusting the vertical distance h 2 from the surface of the fingerprint detection unit to the display screen, ΔL can reach 0.6mm, or up to 0.75mm; for another example, suppose that the vertical distance h 1 +h 2 from the optical path surface of each fingerprint detection unit to the upper surface of the display screen is 1.6 mm, and the deflection angle θ 2 of the light propagating in the air If it is 20°, it is possible to make ΔL reach 0.6mm.
因此，按照上述设置两个指纹检测单元的方式，也就是双光敏感区拼接的方法，合理设置W、G和H这三个参数，以满足指纹检测区域的有效面积的要求，就能实现低成本的屏下光学指纹识别方案。按照这种拼接的方法，两个指纹检测单元的区域输出的数据可以通过数字图像处理算法将整个视场拼接起来，进而进行指纹识别。Therefore, according to the above method of setting two fingerprint detection units, that is, the method of splicing dual-light sensitive areas, the three parameters of W, G, and H are set reasonably to meet the requirements of the effective area of the fingerprint detection area. Cost-effective under-screen optical fingerprint recognition solution. According to this splicing method, the data output by the areas of the two fingerprint detection units can be spliced together through the entire field of view through digital image processing algorithms, and then fingerprint identification can be performed.
可选地，作为第二个实施例，该指纹检测装置包括的该多个指纹检测单元的个数还可以为四个。Optionally, as a second embodiment, the number of the plurality of fingerprint detection units included in the fingerprint detection device may also be four.
可选地，四个指纹检测单元可以通过多种方式进行排列。例如，可以将四个指纹检测单元排列成一行或者一列，或者，也可以将四个指纹检测单元按照2*2的矩阵排列。Optionally, the four fingerprint detection units can be arranged in a variety of ways. For example, the four fingerprint detection units can be arranged in a row or a column, or the four fingerprint detection units can also be arranged in a 2*2 matrix.
图13示出了本申请实施例的四个指纹检测单元的设置方式的示意图。如图13所示，这里假设将四个矩形的指纹检测单元按照2*2的矩阵排列，其中，每个指纹检测单元可以为上述图3至图8所示的指纹检测单元20。Fig. 13 shows a schematic diagram of the arrangement of four fingerprint detection units in an embodiment of the present application. As shown in FIG. 13, it is assumed that four rectangular fingerprint detection units are arranged in a 2*2 matrix, where each fingerprint detection unit may be the fingerprint detection unit 20 shown in FIGS. 3 to 8 above.
具体地，如图13所示，这里将每个指纹检测单元的长度表示为H，每个指纹检测单元的宽度表示为W，将水平方向上相邻的两个指纹检测单元之间的水平距离表示为G1，竖直方向上相邻的两个指纹检测单元之间的竖直距离表示为G2。该图13中的四个指纹检测单元***的矩形方框可以表示指纹检测区域的有效范围，其大于指纹检测单元的总面积。可选地，该指纹检测区域的实际面积可能大于其有效范围，该有效范围表示能够用于指纹识别的最小面积，例如，该指纹检测区域内还可以设置有其他功能区域，本申请实施例并不限于此。Specifically, as shown in Figure 13, the length of each fingerprint detection unit is represented as H, the width of each fingerprint detection unit is represented as W, and the horizontal distance between two adjacent fingerprint detection units in the horizontal direction Denoted as G1, the vertical distance between two adjacent fingerprint detection units in the vertical direction is denoted as G2. The rectangular boxes on the periphery of the four fingerprint detection units in FIG. 13 can indicate the effective range of the fingerprint detection area, which is larger than the total area of the fingerprint detection units. Optionally, the actual area of the fingerprint detection area may be larger than its effective range, and the effective range represents the smallest area that can be used for fingerprint recognition. For example, other functional areas may also be provided in the fingerprint detection area. Not limited to this.
应理解，如图13所示，根据每个指纹检测单元在显示屏的上表面的视场范围的大小，在设置四个指纹检测单元的情况下，通过合理设置W、H、 G1和G2的大小，可以使其满足指纹检测区域的有效面积尺寸的要求。例如，可以基于每个指纹检测单元在显示屏的上表面的视场范围相对于该每个指纹检测单元的边沿外扩的距离，以及显示屏中指纹检测区域的有效面积的最小值，进而确定每个指纹检测单元的尺寸和距离，以满足指纹检测区域的要求。It should be understood that, as shown in FIG. 13, according to the size of the field of view of each fingerprint detection unit on the upper surface of the display screen, when four fingerprint detection units are provided, the W, H, G1, and G2 can be set appropriately. The size can make it meet the requirements of the effective area size of the fingerprint detection area. For example, it can be determined based on the expansion distance of the field of view of each fingerprint detection unit on the upper surface of the display screen relative to the edge of each fingerprint detection unit, and the minimum effective area of the fingerprint detection area in the display screen. The size and distance of each fingerprint detection unit can meet the requirements of fingerprint detection area.
具体地，在该尺寸参数包括：该每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少第一值X(即ΔL大于或者等于该第一值X)、以及该指纹检测区域的长度大于或者等于第二值Y、以及该指纹检测区域的宽度大于或者等于第三值Z的情况下，那么参照图13，对应的可以设置如下参数：该每个指纹检测单元的长度H大于或者等于0.5Y-2X，该每个指纹检测单元的宽度W大于或者等于0.5Z-2X，水平方向上相邻的两个指纹检测单元之间的水平距离G1小于或者等于2X，竖直方向上相邻的两个指纹检测单元之间的竖直距离G2小于或者等于2X。Specifically, the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least a first value X (that is, ΔL is greater than or equal to the first value X). Value X), and the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, then referring to FIG. 13, the following parameters can be set accordingly: The length H of each fingerprint detection unit is greater than or equal to 0.5Y-2X, the width W of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction Less than or equal to 2X, and the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is less than or equal to 2X.
例如，假设本申请实施例的尺寸参数包括：该每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少0.75mm(即ΔL大于或者等于0.75mm)、以及该指纹检测区域的面积大于或者等于6mm*6mm，那么参照图13，对应的可以设置如下参数：每个指纹检测单元的长度H可以设置为大于或者等于1.5mm，每个指纹检测单元的宽度W可以设置为大于或者等于1.5mm，水平方向上相邻的两个指纹检测单元之间的水平距离G1可以设置为小于或者等于1.5mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离G2可以设置为小于或者等于1.5mm。For example, it is assumed that the size parameters of the embodiment of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.75mm outside the edge of each fingerprint detection unit (that is, ΔL is greater than or equal to 0.75mm ), and the area of the fingerprint detection area is greater than or equal to 6mm*6mm, then referring to Figure 13, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit can be set to be greater than or equal to 1.5mm, and each fingerprint detection unit The width W can be set to be greater than or equal to 1.5mm, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction can be set to be less than or equal to 1.5mm, and the two adjacent fingerprint detection units in the vertical direction The vertical distance G2 between them can be set to be less than or equal to 1.5 mm.
例如，按照上述尺寸参数，可以将每个指纹检测单元的长度H设置为2.3mm，该每个指纹检测单元的宽度W设置为2.3mm，水平方向上相邻的两个指纹检测单元之间的水平距离G1设置为1.2mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离G2设置为1.2mm，那么四电子束眼拼接方案的有效区域为(2.3×2+1.2+1.5) 2＝7.3×7.3(mm 2)。 For example, according to the above-mentioned size parameters, the length H of each fingerprint detection unit can be set to 2.3mm, the width W of each fingerprint detection unit is set to 2.3mm, and the distance between two adjacent fingerprint detection units in the horizontal direction The horizontal distance G1 is set to 1.2mm, and the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is set to 1.2mm. Then the effective area of the four-beam eye stitching scheme is (2.3×2+1.2+ 1.5) 2 =7.3×7.3 (mm 2 ).
再例如，假设本申请实施例的尺寸参数包括：每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少0.6mm(即ΔL大于或者等于0.6mm)、以及该指纹检测区域的面积大于或者等于6mm*6mm，那么参照图13，对应的可以设置如下参数：每个指纹检测单元的长度H可以设置为大于或者等于1.8mm，每个指纹检测单元的宽度W可 以设置为大于或者等于1.8mm，水平方向上相邻的两个指纹检测单元之间的水平距离G1可以设置为小于或者等于1.2mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离G2可以设置为小于或者等于1.2mm。For another example, suppose that the size parameters of the embodiment of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.6mm outside the edge of each fingerprint detection unit (that is, ΔL is greater than or equal to 0.6mm ), and the area of the fingerprint detection area is greater than or equal to 6mm*6mm, then referring to Figure 13, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit can be set to be greater than or equal to 1.8mm, and each fingerprint detection unit The width W can be set to be greater than or equal to 1.8mm, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction can be set to be less than or equal to 1.2mm, and the two adjacent fingerprint detection units in the vertical direction The vertical distance G2 between them can be set to be less than or equal to 1.2 mm.
图14示出了本申请实施例的四个指纹检测单元的设置尺寸的示意图，如图14所示，按照上述每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩为0.6mm的情况，可以将将每个指纹检测单元的长度H设置为2.6mm，该每个指纹检测单元的宽度W设置为2.6mm，水平方向上相邻的两个指纹检测单元之间的水平距离G1设置为1mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离G2设置为1mm，那么对应的，指纹检测区域的有效区域则为(2.6×2+1+1.2) 2＝7.4×7.4(mm 2)，满足该指纹检测区域的面积大于或者等于6mm*6mm的要求。 FIG. 14 shows a schematic diagram of the size of the four fingerprint detection units according to an embodiment of the present application. As shown in FIG. 14, the field of view of each fingerprint detection unit on the upper surface of the display screen is When the edge of the unit is expanded to 0.6mm, the length H of each fingerprint detection unit can be set to 2.6mm, the width W of each fingerprint detection unit is set to 2.6mm, and the two adjacent fingerprints in the horizontal direction The horizontal distance G1 between the detection units is set to 1mm, and the vertical distance G2 between two adjacent fingerprint detection units in the vertical direction is set to 1mm. Then the corresponding effective area of the fingerprint detection area is (2.6× 2+1+1.2) 2 =7.4×7.4(mm 2 ), which meets the requirement that the area of the fingerprint detection area is greater than or equal to 6mm*6mm.
再例如，假设本申请实施例的尺寸参数包括：每个指纹检测单元在显示屏的上表面的视场范围为该每个指纹检测单元的边沿外扩至少0.3mm(即ΔL大于或者等于0.3mm)、以及该指纹检测区域的面积大于或者等于6mm*6mm，那么参照图13，对应的可以设置如下参数：每个指纹检测单元的长度H可以设置为大于或者等于2.4mm，每个指纹检测单元的宽度W可以设置为大于或者等于2.4mm，水平方向上相邻的两个指纹检测单元之间的水平距离G1可以设置为小于或者等于0.6mm，竖直方向上相邻的两个指纹检测单元之间的竖直距离G2可以设置为小于或者等于0.6mm。For another example, suppose that the size parameters of the embodiment of the present application include: the field of view of each fingerprint detection unit on the upper surface of the display screen is at least 0.3mm outside the edge of each fingerprint detection unit (that is, ΔL is greater than or equal to 0.3mm ), and the area of the fingerprint detection area is greater than or equal to 6mm*6mm, then referring to Figure 13, the corresponding parameters can be set as follows: the length H of each fingerprint detection unit can be set to be greater than or equal to 2.4mm, and each fingerprint detection unit The width W can be set to be greater than or equal to 2.4mm, the horizontal distance G1 between two adjacent fingerprint detection units in the horizontal direction can be set to be less than or equal to 0.6mm, and the two adjacent fingerprint detection units in the vertical direction The vertical distance G2 between them can be set to be less than or equal to 0.6 mm.
应理解，与设置两个指纹检测单元时类似，无论设置几个指纹检测单元，每个指纹检测单元在显示屏的上表面的视场范围相对于该每个指纹检测单元的边沿外扩的距离ΔL，都可以根据公式(1)，通过参数h 1、h 2、θ 1和θ 2进行确定，并且该ΔL的范围可以根据实际应用进行设置，例如，可以设置上述的0.6mm或者0.75mm，或者也可以设置为更大或者更小的数值，例如，通常将ΔL设置为大于或者等于0.3mm，为了简洁，在此不再赘述。 It should be understood that, similar to when two fingerprint detection units are provided, no matter how many fingerprint detection units are provided, the range of the field of view of each fingerprint detection unit on the upper surface of the display screen is expanded relative to the edge of each fingerprint detection unit. ΔL can be determined by the parameters h 1 , h 2 , θ 1 and θ 2 according to formula (1), and the range of ΔL can be set according to actual applications, for example, the above 0.6 mm or 0.75 mm can be set, Or it can be set to a larger or smaller value. For example, ΔL is usually set to be greater than or equal to 0.3 mm. For the sake of brevity, it will not be repeated here.
根据上述两个实施例，利用拼接的方式，指纹检测装置可以包括两个或者四个指纹检测单元，在此基础上，还可以设置其他个数的指纹检测单元，例如还可以设置多于4个的指纹检测单元，本申请实施例并不限于此。According to the above two embodiments, the fingerprint detection device can include two or four fingerprint detection units by means of splicing. On this basis, other numbers of fingerprint detection units can be provided, for example, more than 4 fingerprint detection units can be provided. The fingerprint detection unit of the present application is not limited to this.
另外，指纹检测单元的拼接方案可以放在单颗CMOS成像芯片上做，也可以使用多个小面积的指纹检测单元的光路架构的CMOS成像芯片进行拼接实现，二者均可以实现低成本、大视场面积、超薄屏下光学指纹。In addition, the stitching scheme of the fingerprint detection unit can be done on a single CMOS imaging chip, or multiple small-area fingerprint detection unit optical path architecture CMOS imaging chips can be used for stitching. Both can achieve low cost and large scale. Field of view area, optical fingerprint under ultra-thin screen.
在本申请实施例中，对于每个指纹检测单元输出的数据，可以通过数字图像重构算法进行处理。具体地，将每一个指纹检测单元的感应区域的相同方向的图像数据做特定像素的移位，得到该区域最清晰图像；不同指纹检测单元的同一对应区域的图像可以通过移动特定像素将图像拼接，得到最清晰图像。拼接过程中可以使用插值的方式弥补非重叠区域图像数据采样不同的问题。和单物方远心微透镜阵列方案做比较，在相同视场面积下，本申请实施例的指纹识别装置中多个指纹检测单元的面积更小，获得的数据量更少，软件资源消耗更小。另外，各个指纹检测单元的AA区域之间的间隔可以用来布局走线，或者，也可以用于放置CMOS敏感单元像素的驱动电路和控制电路，这样可以进一步的减小芯片的面积。In the embodiment of the present application, the data output by each fingerprint detection unit can be processed by a digital image reconstruction algorithm. Specifically, the image data of the sensing area of each fingerprint detection unit in the same direction is shifted by specific pixels to obtain the clearest image of the area; images of the same corresponding area of different fingerprint detection units can be spliced by moving specific pixels , Get the clearest image. In the stitching process, interpolation can be used to compensate for the problem of different image data sampling in non-overlapping regions. Compared with the single-object telecentric microlens array solution, under the same field of view area, the area of the multiple fingerprint detection units in the fingerprint identification device of the embodiment of the application is smaller, the amount of data obtained is less, and the software resource consumption is more small. In addition, the spacing between the AA regions of each fingerprint detection unit can be used for layout wiring, or can also be used for placement of driving circuits and control circuits of CMOS sensitive unit pixels, which can further reduce the chip area.
为了便于说明，这里以一个指纹检测单元中包括的光学感应像素阵列处理图像的方式为例进行描述，指纹检测装置包括的多个指纹检测单元中每个指纹检测单元可以按照相同的方式进行图像处理。For ease of description, the method of processing images by the optical sensor pixel array included in a fingerprint detection unit is taken as an example for description. Each of the multiple fingerprint detection units included in the fingerprint detection device can perform image processing in the same manner. .
具体地，对于一个指纹检测单元，其包括光学感应像素阵列，该光学感应像素阵列包括多个光学感应像素，将该多个光学感应像素分为多组光学感应像素，同一组光学感应像素用于接收同一方向的光信号，也就是说，同一组光学感应像素接收的光信号所经过的导光通道的方向相同。Specifically, for a fingerprint detection unit, it includes an optical sensing pixel array, the optical sensing pixel array includes a plurality of optical sensing pixels, the plurality of optical sensing pixels are divided into multiple groups of optical sensing pixels, the same group of optical sensing pixels is used for The light signals in the same direction are received, that is, the light guide channels through which the light signals received by the same group of optical sensing pixels pass are in the same direction.
光学感应像素阵列分为多组光学感应像素，则该多组光学感应像素用于接收多个方向的光信号以得到多张图像，该多张图像用于检测手指的指纹信息。例如，每个指纹检测单元可以直接输出该多张图像，或者，也可以通过该多张图像重构为一张图像，重构图像用于进行指纹识别。The optical sensing pixel array is divided into multiple groups of optical sensing pixels, and the multiple sets of optical sensing pixels are used to receive light signals in multiple directions to obtain multiple images, and the multiple images are used to detect fingerprint information of a finger. For example, each fingerprint detection unit can directly output the multiple images, or can also reconstruct the multiple images into one image, and the reconstructed image can be used for fingerprint recognition.
可选地，该多组光学感应像素中的一组光学感应像素用于接收该多个方向中一个方向的光信号得到该多张图像中的一张图像。例如，如图5所示，假设指纹检测单元中的光学感应像素阵列一共可以接收四个方向的光，也就是该指纹检测单元包括四个方向的导光通道，那么可以将光学感应像素阵列分为四组光学感应像素，其中，第一组光学感应像素用于接收第一方向的光信号，例如该第一组光学感应像素可以包括图5中左上角包括的光学感应像素，并转化为第一组电信号，该第一组电信号用于形成第一图像；依次类推，第二组光学感应像素用于接收第二方向的光信号，例如该第二组光学感应像素可以包括图5中右上角包括的光学感应像素，并转化为第二组电信号，该第二组电信号用于形成第二图像；第三组光学感应像素用于接收第三方向的 光信号，例如该第三组光学感应像素可以包括图5中左下角包括的光学感应像素，并转化为第三组电信号，该第三组电信号用于形成第三图像，第四组光学感应像素用于接收第四方向的光信号，例如该第四组光学感应像素可以包括图5中右下角包括的光学感应像素，并转化为第四组电信号，该第四组电信号用于形成第四图像。Optionally, a set of optical sensing pixels in the plurality of sets of optical sensing pixels are used to receive a light signal in one of the plurality of directions to obtain one of the plurality of images. For example, as shown in Figure 5, assuming that the optical sensing pixel array in the fingerprint detection unit can receive light in four directions in total, that is, the fingerprint detection unit includes light guide channels in four directions, then the optical sensing pixel array can be divided into There are four sets of optical sensing pixels, where the first set of optical sensing pixels are used to receive light signals in the first direction. For example, the first set of optical sensing pixels may include the optical sensing pixels included in the upper left corner of FIG. A set of electrical signals, the first set of electrical signals is used to form the first image; and so on, the second set of optical sensing pixels are used to receive optical signals in the second direction, for example, the second set of optical sensing pixels may include The optical sensing pixels included in the upper right corner are converted into a second set of electrical signals, and the second set of electrical signals are used to form a second image; the third set of optical sensing pixels are used to receive light signals in a third direction, such as the third The group of optical sensing pixels may include the optical sensing pixels included in the lower left corner of FIG. 5, and converted into a third group of electrical signals. The third group of electrical signals is used to form a third image, and the fourth group of optical sensing pixels is used to receive the fourth group. Directional optical signals, for example, the fourth group of optical sensing pixels may include the optical sensing pixels included in the lower right corner of FIG. 5, and converted into a fourth group of electrical signals, which are used to form a fourth image.
可选地，该多组光学感应像素中每组像素的像素数量可以相等或者不相等；若该多组光学感应像素的个数都相等，那么可以采用相同的排列方式。例如，如图5所示，假设每个微透镜下方都像该第二微透镜212一样，对应分布有四个光学感应像素，那么在将光学感应像素阵列分组时，可以将每个微透镜左上方的光学感应像素分为同一组，该同组的光学感应像素接收的光信号方向相同；类似的，一共可以分为四组，该四组光学感应像素中包括的光学感应像素的个数都相同，且排列方式也相同，都位于对应微透镜的左上角的位置处。Optionally, the number of pixels in each group of the plurality of groups of optical sensing pixels may be equal or unequal; if the number of the plurality of groups of optical sensing pixels is equal, the same arrangement can be adopted. For example, as shown in FIG. 5, assuming that the bottom of each microlens is like the second microlens 212, there are four optical sensing pixels distributed correspondingly, then when the optical sensing pixel array is grouped, the upper left of each microlens can be The optical sensing pixels of the same group are divided into the same group. The optical sensing pixels of the same group receive the same direction of light signals; similarly, they can be divided into four groups in total. The number of optical sensing pixels included in the four groups of optical sensing pixels is all The same, and the arrangement is also the same, they are all located at the upper left corner of the corresponding micro lens.
应理解，将光学感应像素阵列分为多组光学感应像素，每组光学感应像素中的每个光学感应像素可以对应于一张图像中的一个像素点，也就是说，光学感应像素阵列中每个光学感应像素都只对应于一个像素点，那么对应产生的图像较为清晰，相对计算量也较大。It should be understood that the optical sensing pixel array is divided into multiple groups of optical sensing pixels, and each optical sensing pixel in each group of optical sensing pixels may correspond to one pixel in an image, that is, each optical sensing pixel array Each optical sensor pixel corresponds to only one pixel point, so the correspondingly generated image is clearer and the relative calculation amount is relatively large.
考虑减小计算量，可选地，对于该多组光学感应像素中任意一组光学感应像素，也可以多个光学感应像素产生一个像素点。例如，假设多组光学感应像素包括的光学感应像素的个数是相同的，可以将一组光学感应像素中位置上连续的预设个数的光学感应像素对应输出一个像素点，这样可以大大缩减计算量。In consideration of reducing the amount of calculation, optionally, for any group of optical sensing pixels in the plurality of sets of optical sensing pixels, multiple optical sensing pixels may also generate one pixel point. For example, assuming that the number of optical sensing pixels included in multiple groups of optical sensing pixels is the same, a preset number of optical sensing pixels in a continuous position in a group of optical sensing pixels can be corresponding to output one pixel point, which can greatly reduce Calculation amount.
其中，上述输出同一个像素点的同一组光学感应像素中位置上连续的多个光学感应像素可能并不相邻，也就是说，对于任意的用于输出同一个像素点的连续的多个光学感应像素而言，该连续的多个光学感应像素中任意两个光学感应像素之间的位置可能存在有其它的光学感应像素，但是存在的该其它光学感应像素接收的光信号与该连续的多个光学感应像素接收的光信号方向不同，也就是说，该连续的多个光学感应像素中任意两个光学感应像素之间的位置不可能存在下述光学感应像素：该光学感应像素接收的光信号的方向与该连续的多个光学感应像素接收的光信号方向相同。Among them, the multiple optical sensing pixels in the same group of optical sensing pixels that output the same pixel may not be adjacent in position, that is, for any continuous multiple optical sensing pixels used to output the same pixel In terms of sensing pixels, there may be other optical sensing pixels in the position between any two optical sensing pixels in the continuous plurality of optical sensing pixels, but the light signal received by the other optical sensing pixels is different from the continuous multiplicity of light signals. The direction of the light signal received by each optical sensing pixel is different, that is, the position between any two optical sensing pixels in the continuous plurality of optical sensing pixels cannot exist the following optical sensing pixel: the light received by the optical sensing pixel The direction of the signal is the same as the direction of the light signal received by the consecutive plurality of optical sensing pixels.
例如，以图5为例，假设每个微透镜都与该第二微透镜212一样，对应 四个光学感应像素，那么每个微透镜左上角的光学感应像素属于同一组，对于这一组光学感应像素而言，与该第三光学感应像素243连续的一个或者多个光学感应像素可以包括：在与该第二微透镜212相邻的一个或者多个微透镜(例如如图3所示的第一微透镜211和第三微透镜213)中，每个微透镜的左上角对应的光学感应像素；同时，与该第三光学感应像素243连续的一个或者多个光学感应像素不会包括：与该第二微透镜212不相邻的微透镜对应的光学感应像素，例如，不会包括与该第二微透镜212间隔有其他微透镜的任意一个微透镜对应的光学感应像素。并且，该第三光学感应像素243与其他与之连续的一个或者多个光学感应像素可以用于共同输出一个像素点。For example, taking Figure 5 as an example, assuming that each microlens is the same as the second microlens 212 and corresponds to four optical sensing pixels, then the optical sensing pixels in the upper left corner of each microlens belong to the same group. In terms of sensing pixels, one or more optical sensing pixels that are continuous with the third optical sensing pixel 243 may include: one or more microlenses adjacent to the second microlens 212 (for example, as shown in FIG. 3 In the first microlens 211 and the third microlens 213), the upper left corner of each microlens corresponds to the optical sensing pixel; at the same time, one or more optical sensing pixels continuous with the third optical sensing pixel 243 will not include: The optical sensing pixel corresponding to the micro lens that is not adjacent to the second micro lens 212, for example, does not include the optical sensing pixel corresponding to any micro lens spaced apart from the second micro lens 212 with other micro lenses. In addition, the third optical sensing pixel 243 and one or more continuous optical sensing pixels may be used to jointly output a pixel point.
应理解，按照上述描述的方式，每个指纹检测单元都可以输出一张或者多张图像，例如，假设该多个指纹检测单元最终各输出一张指纹图像，则可以将该多张图像合并，以进行指纹检测。或者，若多个指纹检测单元中每个指纹检测单元输出多个图像，例如，多个图像对应多个方向的光信号，可以将该多个指纹检测单元输出的全部图像中光信号相同的指纹图像进行合并处理，例如，将每一个指纹检测单元的感应区域的相同方向的图像数据做特定像素的移位，得到该区域最清晰图像；不同指纹检测单元的同一对应区域的图像可以通过移动特定像素将图像拼接，得到最清晰图像。It should be understood that, in the manner described above, each fingerprint detection unit can output one or more images. For example, if the multiple fingerprint detection units finally output one fingerprint image, the multiple images can be combined. For fingerprint detection. Or, if each fingerprint detection unit in multiple fingerprint detection units outputs multiple images, for example, multiple images correspond to light signals in multiple directions, the fingerprints with the same light signal in all images output by the multiple fingerprint detection units can be The images are merged, for example, the image data in the same direction of the sensing area of each fingerprint detection unit is shifted by a specific pixel to obtain the clearest image of the area; the images of the same corresponding area of different fingerprint detection units can be specified Pixel stitches the image together to get the clearest image.
另外，本申请实施例的指纹检测装置还可以用于2D和3D的真假指纹区分。由于每个指纹检测单元都可以接收多个方向上的图像，例如可以接收四个方向的图像。在指纹的谷和脊按压在OLED屏上表面的情况下，当斜方向接收光时，由于布儒斯特角的特性，OLED屏上表面位于谷的地方反射线偏振光穿入手机。当反射的线偏振光与手机线偏振片呈现平行时，下方传感器接收的光强最大；当反射的线偏振光与手机屏线偏振片方向垂直时，下方传感器接收到的光最弱。也就是3D指纹按压在OLED屏上表面，电子束眼与手机屏线偏振片不同方向图像原始数据有差异，但是2D指纹这个差异就不明显。因此，通过区分不同方向光的原始数据差异，可以一定程度上区分出2D假指纹和3D指纹。In addition, the fingerprint detection device of the embodiment of the present application can also be used to distinguish true and false fingerprints in 2D and 3D. Since each fingerprint detection unit can receive images in multiple directions, for example, it can receive images in four directions. When the valleys and ridges of the fingerprint are pressed on the upper surface of the OLED screen, when light is received in an oblique direction, due to the Brewster angle characteristic, the valleys on the upper surface of the OLED screen reflect linearly polarized light into the mobile phone. When the reflected linearly polarized light is parallel to the linear polarizer of the mobile phone, the light intensity received by the lower sensor is the largest; when the reflected linearly polarized light is perpendicular to the direction of the linear polarizer on the mobile phone screen, the light received by the lower sensor is the weakest. That is, when the 3D fingerprint is pressed on the upper surface of the OLED screen, the original image data of the electron beam eye and the linear polarizer of the mobile phone screen are different, but the difference between the 2D fingerprint is not obvious. Therefore, by distinguishing the difference of the original data of light from different directions, it is possible to distinguish 2D fake fingerprints and 3D fingerprints to a certain extent.
因此，本申请实施例的指纹检测装置，包括多个指纹检测单元，通过将该多个指纹检测单元合理拼接，可以实现大视场和光线斜接收，进而可以降低实际芯片面积，减小了芯片成本，减少软件资源消耗，还能够提升干手指纹的成像效果。Therefore, the fingerprint detection device of the embodiment of the present application includes multiple fingerprint detection units. By properly splicing the multiple fingerprint detection units, a large field of view and oblique light reception can be realized, thereby reducing the actual chip area and the chip Cost, reduce software resource consumption, and can also improve the imaging effect of dry hand fingerprints.
本申请实施例还提供了一种电子设备，该电子设备可以包括显示屏以及上述本申请实施例的指纹检测的装置，其中，该指纹检测的装置设置于该显示屏下方，以实现屏下光学指纹检测。The embodiment of the present application also provides an electronic device, which may include a display screen and the fingerprint detection device of the above-mentioned embodiment of the application, wherein the fingerprint detection device is arranged under the display screen to realize under-screen optical Fingerprint detection.
该电子设备可以为任何具有显示屏的电子设备。The electronic device can be any electronic device with a display screen.
显示屏可以采用以上描述中的显示屏，例如OLED显示屏或其他显示屏，显示屏的相关说明可以参考以上描述中关于显示屏的描述，为了简洁，在此不再赘述。The display screen may be the display screen described above, such as an OLED display screen or other display screens. For the related description of the display screen, refer to the description of the display screen in the above description. For the sake of brevity, details are not repeated here.
该电子设备还可以包括至少一个处理器，该至少一个处理器用于处理多个指纹检测单元输出的数据。例如，该电子设备可以通过一个处理器分别接收每个指纹检测单元输出的图像数据，例如，可以通过串行外设接口(Serial Peripheral Interface，SPI)接收每个指纹检测单元的数据，并将该多个指纹检测单元的数据进行处理。或者，该电子设备还可以通过多个处理器的SPI接口，分别接收每个指纹检测单元输出的图像数据，每个处理器分别进行处理后，再通过其中一个处理器进行合并处理，本申请实施例并不限于此。The electronic device may further include at least one processor configured to process data output by a plurality of fingerprint detection units. For example, the electronic device can receive the image data output by each fingerprint detection unit through a processor. For example, it can receive the data of each fingerprint detection unit through a serial peripheral interface (SPI), and combine the Data from multiple fingerprint detection units are processed. Alternatively, the electronic device can also receive the image data output by each fingerprint detection unit through the SPI interfaces of multiple processors, and after each processor performs the processing separately, the combined processing is performed by one of the processors. The implementation of this application Examples are not limited to this.
应理解，本申请实施例中的具体的例子只是为了帮助本领域技术人员更好地理解本申请实施例，而非限制本申请实施例的范围。It should be understood that the specific examples in the embodiments of the present application are only intended to help those skilled in the art to better understand the embodiments of the present application, rather than limiting the scope of the embodiments of the present application.
应理解，在本申请实施例和所附权利要求书中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请实施例。例如，在本申请实施例和所附权利要求书中所使用的单数形式的“一种”、“上述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。It should be understood that the terms used in the embodiments of the present application and the appended claims are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. For example, the singular forms of "a", "above" and "the" used in the embodiments of this application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。A person of ordinary skill in the art may be aware that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are executed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的***、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the above-described system, device, and unit can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.
在本申请所提供的几个实施例中，应该理解到，所揭露的***、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可 以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个***，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。In addition, the functional units in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of this application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disk or optical disk and other media that can store program code .
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims (37)

  1. 一种指纹检测装置，其特征在于，适用于显示屏的下方以实现屏下光学指纹检测，所述显示屏包括指纹检测区域，所述指纹检测区域用于手指触摸以进行指纹检测，所述指纹检测装置包括：A fingerprint detection device, characterized in that it is suitable for under the display screen to realize under-screen optical fingerprint detection, the display screen includes a fingerprint detection area, and the fingerprint detection area is used for finger touch for fingerprint detection. The detection device includes:
    多个指纹检测单元，所述多个指纹检测单元中每个指纹检测单元的尺寸以及相邻两个指纹检测单元之间的距离为根据尺寸参数设置的，所述尺寸参数包括以下参数中的至少一个：所述每个指纹检测单元的视场范围、所述指纹检测区域的面积、所述显示屏的厚度以及所述每个指纹检测单元的光路上表面至所述显示屏的下表面的距离；A plurality of fingerprint detection units, the size of each fingerprint detection unit in the plurality of fingerprint detection units and the distance between two adjacent fingerprint detection units are set according to a size parameter, and the size parameter includes at least one of the following parameters One: the field of view range of each fingerprint detection unit, the area of the fingerprint detection area, the thickness of the display screen, and the distance from the optical path surface of each fingerprint detection unit to the bottom surface of the display screen ；
    其中，所述每个指纹检测单元包括：Wherein, each fingerprint detection unit includes:
    微透镜阵列，用于设置在所述显示屏的下方，且包括多个微透镜；A microlens array, configured to be arranged below the display screen and including a plurality of microlenses;
    至少一个挡光层，设置在所述微透镜阵列的下方，且形成有所述多个微透镜中的每个微透镜对应的多个导光通道，所述每个微透镜对应的多个导光通道中每个导光通道与所述每个微透镜的光轴之间的夹角小于90°；At least one light blocking layer is disposed under the microlens array, and a plurality of light guide channels corresponding to each of the plurality of microlenses are formed, and a plurality of light guide channels corresponding to each of the plurality of microlenses are formed. The angle between each light guide channel in the light channel and the optical axis of each microlens is less than 90°;
    光学感应像素阵列，设置在所述至少一个挡光层的下方，且包括多个光学感应像素，所述每个微透镜对应的多个导光通道中的每个导光通道的下方设置有一个光学感应像素，所述一个光学感应像素用于接收经由微透镜汇聚并通过对应的导光通道传输的光信号，所述光信号用于检测手指的指纹信息。The optical sensing pixel array is arranged under the at least one light blocking layer and includes a plurality of optical sensing pixels, and one of the plurality of light guide channels corresponding to each microlens is provided below each light guide channel Optical sensing pixels, the one optical sensing pixel is used to receive the optical signal converged through the microlens and transmitted through the corresponding light guide channel, and the optical signal is used to detect fingerprint information of the finger.
  2. 根据权利要求1所述的指纹检测装置，其特征在于，所述多个指纹检测单元的尺寸相同。The fingerprint detection device according to claim 1, wherein the size of the plurality of fingerprint detection units is the same.
  3. 根据权利要求1或2所述的指纹检测装置，其特征在于，所述多个指纹检测单元中位于同一行的多个指纹检测单元的间隔距离相等；和/或，The fingerprint detection device according to claim 1 or 2, wherein the plurality of fingerprint detection units located in the same row of the plurality of fingerprint detection units have an equal separation distance; and/or,
    所述多个指纹检测单元中位于同一列的多个指纹检测单元的间隔距离相等。The plurality of fingerprint detection units located in the same column among the plurality of fingerprint detection units have an equal separation distance.
  4. 根据权利要求1至3中任一项所述的指纹检测装置，其特征在于，所述多个指纹检测单元的个数为两个。The fingerprint detection device according to any one of claims 1 to 3, wherein the number of the plurality of fingerprint detection units is two.
  5. 根据权利要求4所述的指纹检测装置，其特征在于，两个指纹检测单元左右并排设置。4. The fingerprint detection device according to claim 4, wherein the two fingerprint detection units are arranged side by side.
  6. 根据权利要求5所述的指纹检测装置，其特征在于，在所述尺寸参数包括：所述每个指纹检测单元在显示屏的上表面的视场范围为所述每个指 纹检测单元的边沿外扩至少第一值X、以及所述指纹检测区域的长度大于或者等于第二值Y、以及所述指纹检测区域的宽度大于或者等于第三值Z的情况下，所述每个指纹检测单元的长度大于或者等于Y-2X，所述每个指纹检测单元的宽度大于或者等于0.5Z-2X，所述两个指纹检测单元之间的水平距离小于或者等于2X。The fingerprint detection device according to claim 5, wherein the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is outside the edge of each fingerprint detection unit Expand at least the first value X, the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, each fingerprint detection unit The length is greater than or equal to Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, and the horizontal distance between the two fingerprint detection units is less than or equal to 2X.
  7. 根据权利要求1至3中任一项所述的指纹检测装置，其特征在于，所述多个指纹检测单元的个数为四个。The fingerprint detection device according to any one of claims 1 to 3, wherein the number of the plurality of fingerprint detection units is four.
  8. 根据权利要求7所述的指纹检测装置，其特征在于，四个指纹检测单元按照2*2的矩阵排列。7. The fingerprint detection device according to claim 7, wherein the four fingerprint detection units are arranged in a 2*2 matrix.
  9. 根据权利要求8所述的指纹检测装置，其特征在于，在所述尺寸参数包括：所述每个指纹检测单元在显示屏的上表面的视场范围为所述每个指纹检测单元的边沿外扩至少第一值X、以及所述指纹检测区域的长度大于或者等于第二值Y、以及所述指纹检测区域的宽度大于或者等于第三值Z的情况下，所述每个指纹检测单元的长度大于或者等于0.5Y-2X，所述每个指纹检测单元的宽度大于或者等于0.5Z-2X，水平方向上相邻的两个指纹检测单元之间的水平距离小于或者等于2X，竖直方向上相邻的两个指纹检测单元之间的竖直距离小于或者等于2X。The fingerprint detection device according to claim 8, wherein the size parameter includes: the field of view of each fingerprint detection unit on the upper surface of the display screen is outside the edge of each fingerprint detection unit Expand at least the first value X, the length of the fingerprint detection area is greater than or equal to the second value Y, and the width of the fingerprint detection area is greater than or equal to the third value Z, each fingerprint detection unit The length is greater than or equal to 0.5Y-2X, the width of each fingerprint detection unit is greater than or equal to 0.5Z-2X, the horizontal distance between two adjacent fingerprint detection units in the horizontal direction is less than or equal to 2X, and the vertical direction The vertical distance between two adjacent fingerprint detection units is less than or equal to 2X.
  10. 根据权利要求1至9中任一项所述的指纹检测装置，其特征在于，The fingerprint detection device according to any one of claims 1 to 9, wherein:
    所述每个微透镜对应的多个导光通道的底部分别延伸至相邻的多个微透镜的下方；或者，The bottoms of the multiple light guide channels corresponding to each microlens respectively extend below the multiple adjacent microlenses; or,
    所述每个微透镜对应的多个导光通道的底部位于同一个微透镜的下方。The bottoms of the multiple light guide channels corresponding to each microlens are located under the same microlens.
  11. 根据权利要求1至10中任一项所述的指纹检测装置，其特征在于，所述每个微透镜对应的多个导光通道沿同一微透镜的光轴方向中心对称分布。The fingerprint detection device according to any one of claims 1 to 10, wherein the multiple light guide channels corresponding to each microlens are centrally symmetrically distributed along the optical axis direction of the same microlens.
  12. 根据权利要求1至11中任一项所述的指纹检测装置，其特征在于，所述每个微透镜对应的多个导光通道中的每个导光通道和第一平面形成预设夹角，以使所述每个微透镜下方设置的多个光学感应像素分别用于接收经由微透镜汇聚的并通过对应的导光通道传输的光信号，其中，所述第一平面为与所述显示屏平行的平面。The fingerprint detection device according to any one of claims 1 to 11, wherein each light guide channel of the plurality of light guide channels corresponding to each microlens forms a preset angle with the first plane , So that the multiple optical sensing pixels arranged under each microlens are respectively used to receive the optical signals converged by the microlens and transmitted through the corresponding light guide channel, wherein the first plane is connected to the display A plane parallel to the screen.
  13. 根据权利要求12所述的指纹检测装置，其特征在于，所述预设夹角的范围为15度至60度。The fingerprint detection device of claim 12, wherein the preset included angle ranges from 15 degrees to 60 degrees.
  14. 根据权利要求12或13所述的指纹检测装置，其特征在于，所述每个微透镜对应的多个导光通道在所述第一平面的投影相对同一微透镜的光轴在所述第一平面的投影中心对称分布。The fingerprint detection device according to claim 12 or 13, wherein the projection of the multiple light guide channels corresponding to each microlens on the first plane is in the first plane relative to the optical axis of the same microlens. The projection centers of the plane are symmetrically distributed.
  15. 根据权利要求12至14中任一项所述的指纹检测装置，其特征在于，所述光学感应像素阵列包括多组光学感应像素，所述多组光学感应像素中同一组光学感应像素接收的光信号所经过的导光通道的方向相同，所述多组光学感应像素用于接收多个方向的光信号以得到多张图像，所述多张图像用于检测手指的指纹信息。The fingerprint detection device according to any one of claims 12 to 14, wherein the optical sensing pixel array comprises multiple sets of optical sensing pixels, and the light received by the same set of optical sensing pixels in the multiple sets of optical sensing pixels The directions of the light guide channels through which the signals pass are the same, the multiple groups of optical sensing pixels are used to receive light signals in multiple directions to obtain multiple images, and the multiple images are used to detect fingerprint information of a finger.
  16. 根据权利要求15所述的指纹检测装置，其特征在于，所述多组光学感应像素中的一组光学感应像素用于接收所述多个方向中一个方向的光信号得到所述多张图像中的一张图像。The fingerprint detection device according to claim 15, wherein a set of optical sensing pixels in the plurality of sets of optical sensing pixels are used to receive light signals in one of the plurality of directions to obtain Of an image.
  17. 根据权利要求16所述的指纹检测装置，其特征在于，所述多组像素中每组像素的像素数量相等，且排列方式相同。The fingerprint detection device according to claim 16, wherein the number of pixels in each group of pixels in the plurality of groups of pixels is equal, and the arrangement manner is the same.
  18. 根据权利要求16或17所述的指纹检测装置，其特征在于，所述多组光学感应像素中的一组光学感应像素中一个光学感应像素对应一张图像中的一个像素点。The fingerprint detection device according to claim 16 or 17, wherein one optical sensing pixel in a set of optical sensing pixels in the plurality of sets of optical sensing pixels corresponds to one pixel in an image.
  19. 根据权利要求16或者17所述的指纹检测装置，其特征在于，所述多组光学感应像素中的一组光学感应像素中连续的多个光学感应像素对应一张图像中的一个像素点。The fingerprint detection device according to claim 16 or 17, wherein a plurality of consecutive optical sensing pixels in a set of optical sensing pixels in the plurality of sets of optical sensing pixels corresponds to one pixel in an image.
  20. 根据权利要求1至19中任一项所述的指纹检测装置，其特征在于，所述每个微透镜下方的多个光学感应像素的分布呈矩形或菱形。The fingerprint detection device according to any one of claims 1 to 19, wherein the distribution of the plurality of optical sensing pixels under each microlens is rectangular or rhombus.
  21. 根据权利要求1至20中任一项所述的指纹检测装置，其特征在于，所述至少一个挡光层为多个挡光层，不同挡光层中设置有所述每个微透镜对应的至少一个开孔，以形成所述每个微透镜对应的多个导光通道。The fingerprint detection device according to any one of claims 1 to 20, wherein the at least one light blocking layer is a plurality of light blocking layers, and different light blocking layers are provided with corresponding microlenses. At least one opening is used to form a plurality of light guide channels corresponding to each microlens.
  22. 根据权利要求21所述的指纹检测装置，其特征在于，不同挡光层中的与同一微透镜对应的开孔的数量由上至下依次增大。22. The fingerprint detection device according to claim 21, wherein the number of openings corresponding to the same microlens in different light blocking layers increases sequentially from top to bottom.
  23. 根据权利要求21或22所述的指纹检测装置，其特征在于，不同挡光层中的与同一微透镜对应的开孔的孔径由上至下依次减小。The fingerprint detection device according to claim 21 or 22, wherein the apertures of the openings in different light blocking layers corresponding to the same microlens are sequentially reduced from top to bottom.
  24. 根据权利要求21至23中任一项所述的指纹检测装置，其特征在于，所述多个挡光层中的底层挡光层中设置有所述每个微透镜对应的多个开孔，所述每个微透镜对应的多个导光通道分别穿过所述底层挡光层中的同一微 透镜对应的多个开孔。The fingerprint detection device according to any one of claims 21 to 23, wherein the bottom light-blocking layer of the plurality of light-blocking layers is provided with a plurality of openings corresponding to each of the microlenses, The multiple light guide channels corresponding to each microlens respectively pass through multiple openings corresponding to the same microlens in the bottom light blocking layer.
  25. 根据权利要求21至24中任一项所述的指纹检测装置，其特征在于，所述多个挡光层中的顶层挡光层在所述每个微透镜的光轴上设置有开孔，所述每个微透镜对应的多个导光通道均穿过所述顶层挡光层中同一微透镜对应的开孔。The fingerprint detection device according to any one of claims 21 to 24, wherein the top light blocking layer of the plurality of light blocking layers is provided with an opening on the optical axis of each microlens, The multiple light guide channels corresponding to each microlens all pass through the corresponding openings of the same microlens in the top light blocking layer.
  26. 根据权利要求21至25中任一项所述的指纹检测装置，其特征在于，所述多个挡光层中的非底层挡光层在所述多个微透镜中相邻的两个微透镜的后焦点的中间位置设置有开孔，所述相邻的两个微透镜对应的两个导光通道均穿过所述非底层挡光层中的所述相邻的两个微透镜对应的开孔，以使所述每个微透镜对应的多个导光通道的底部分别延伸至相邻的多个微透镜的下方。The fingerprint detection device according to any one of claims 21 to 25, wherein the non-bottom light-blocking layer of the plurality of light-blocking layers is adjacent to two microlenses in the plurality of microlenses The middle position of the back focus is provided with an opening, and the two light guide channels corresponding to the two adjacent microlenses pass through the corresponding two adjacent microlenses in the non-bottom light blocking layer The holes are opened so that the bottoms of the multiple light guide channels corresponding to each microlens extend below the adjacent multiple microlenses.
  27. 根据权利要求1至20中任一项所述的指纹检测装置，其特征在于，所述至少一个挡光层仅包括一个挡光层，所述多个导光通道为所述一个挡光层中的同一微透镜对应的多个倾斜通孔。The fingerprint detection device according to any one of claims 1 to 20, wherein the at least one light blocking layer includes only one light blocking layer, and the plurality of light guide channels are in the one light blocking layer Multiple oblique through holes corresponding to the same micro lens.
  28. 根据权利要求27所述的指纹检测装置，其特征在于，所述一个挡光层的厚度大于预设阈值，以使所述每个微透镜下方设置的多个光学感应像素分别用于接收经由微透镜汇聚的并通过对应的导光通道传输的光信号。The fingerprint detection device according to claim 27, wherein the thickness of the one light-blocking layer is greater than a preset threshold, so that a plurality of optical sensing pixels arranged under each microlens are respectively used for receiving via the microlens The optical signal converged by the lens and transmitted through the corresponding light guide channel.
  29. 根据权利要求1至28中任一项所述的指纹检测装置，其特征在于，所述每个指纹检测单元还包括：The fingerprint detection device according to any one of claims 1 to 28, wherein each fingerprint detection unit further comprises:
    透明介质层，设置在以下位置中的至少一处：The transparent medium layer is set in at least one of the following positions:
    所述微透镜阵列和所述至少一个挡光层之间，Between the micro lens array and the at least one light blocking layer,
    所述至少一个挡光层之间，以及Between the at least one light blocking layer, and
    所述至少一个挡光层和所述光学感应像素阵列。The at least one light blocking layer and the optical sensing pixel array.
  30. 根据权利要求1至29中任一项所述的指纹检测装置，其特征在于，所述至少一层挡光层和所述微透镜阵列集成设置，或所述至少一层挡光层和所述光学感应像素阵列集成设置。The fingerprint detection device according to any one of claims 1 to 29, wherein the at least one light blocking layer and the microlens array are integrated, or the at least one light blocking layer and the The optical sensor pixel array is integrated.
  31. 根据权利要求1至30中任一项所述的指纹检测装置，其特征在于，所述每个微透镜满足以下条件中的至少一项：The fingerprint detection device according to any one of claims 1 to 30, wherein each microlens satisfies at least one of the following conditions:
    所述微透镜的聚光面在与其光轴垂直的平面上的投影为矩形或圆形；The projection of the condensing surface of the micro lens on a plane perpendicular to its optical axis is rectangular or circular;
    所述微透镜的聚光面为非球面；The condensing surface of the micro lens is an aspheric surface;
    所述微透镜的聚光面的各个方向上的曲率相同；The curvature of the light-condensing surface of the microlens is the same in all directions;
    所述微透镜包括至少一片透镜；以及The micro lens includes at least one lens; and
    所述微透镜的焦距范围为10um-2mm。The focal length of the microlens is in the range of 10um-2mm.
  32. 根据权利要求1至31中任一项所述的指纹检测装置，其特征在于，所述微透镜阵列满足以下条件的至少一项：The fingerprint detection device according to any one of claims 1 to 31, wherein the microlens array satisfies at least one of the following conditions:
    所述微透镜阵列呈多边形排列；和The microlens array is arranged in a polygonal shape; and
    所述微透镜阵列的占空比的范围为100％-50％。The duty cycle of the microlens array ranges from 100% to 50%.
  33. 根据权利要求1至32中任一项所述的指纹检测装置，其特征在于，所述微透镜阵列的周期与所述光学感应像素阵列的周期不相等，且所述微透镜阵列的周期是所述光学感应像素阵列的周期的有理数倍。The fingerprint detection device according to any one of claims 1 to 32, wherein the period of the microlens array is not equal to the period of the optical sensing pixel array, and the period of the microlens array is The optical sensing pixel array is a rational multiple of the period.
  34. 根据权利要求1至33中任一项所述的指纹检测装置，其特征在于，所述指纹检测装置与所述显示屏之间的距离为20um-3000um。The fingerprint detection device according to any one of claims 1 to 33, wherein the distance between the fingerprint detection device and the display screen is 20um-3000um.
  35. 根据权利要求1至34中任一项所述的指纹检测装置，其特征在于，所述每个指纹检测单元还包括：The fingerprint detection device according to any one of claims 1 to 34, wherein each fingerprint detection unit further comprises:
    滤光层，设置在以下位置中的至少一处：The filter layer is set in at least one of the following positions:
    所述微透镜阵列的上方，以及Above the microlens array, and
    所述微透镜阵列与所述光学感应像素阵列之间。Between the micro lens array and the optical sensing pixel array.
  36. 一种电子设备，其特征在于，包括：An electronic device, characterized in that it comprises:
    显示屏；以及Display screen; and
    根据权利要求1至35中任一项所述的指纹检测装置。The fingerprint detection device according to any one of claims 1 to 35.
  37. 根据权利要求36所述的电子设备，其特征在于，所述显示屏包括指纹检测区域，所述指纹检测区域用于为手指提供触摸界面。The electronic device of claim 36, wherein the display screen comprises a fingerprint detection area, and the fingerprint detection area is used to provide a touch interface for a finger.
PCT/CN2019/111103 2019-07-12 2019-10-14 Fingerprint detection apparatus and electronic device WO2021007964A1 (en)

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PCT/CN2019/095880 WO2021007730A1 (en) 2019-07-12 2019-07-12 Fingerprint detection apparatus and electronic device
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PCT/CN2019/099135 WO2021022425A1 (en) 2019-08-02 2019-08-02 Fingerprint detection apparatus and electronic device
CNPCT/CN2019/099135 2019-08-02
CNPCT/CN2019/102366 2019-08-23
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