WO2021189478A1 - Appareil de détection d'empreintes digitales et dispositif électronique - Google Patents

Appareil de détection d'empreintes digitales et dispositif électronique Download PDF

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Publication number
WO2021189478A1
WO2021189478A1 PCT/CN2020/081847 CN2020081847W WO2021189478A1 WO 2021189478 A1 WO2021189478 A1 WO 2021189478A1 CN 2020081847 W CN2020081847 W CN 2020081847W WO 2021189478 A1 WO2021189478 A1 WO 2021189478A1
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WO
WIPO (PCT)
Prior art keywords
light
layer
red
filter layer
optical
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Application number
PCT/CN2020/081847
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English (en)
Chinese (zh)
Inventor
曾红林
程祥
张玮
李顺展
Original Assignee
深圳市汇顶科技股份有限公司
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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 PCT/CN2020/081847 priority Critical patent/WO2021189478A1/fr
Priority to CN202080001570.6A priority patent/CN111837132B/zh
Publication of WO2021189478A1 publication Critical patent/WO2021189478A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms

Definitions

  • the embodiments of the present application relate to the field of biometric identification, and more specifically, to a fingerprint detection device and electronic equipment.
  • the light source illuminates the finger above the display screen, and the optical fingerprint sensor collects the light signal returned by the reflection or scattering of the finger, so as to obtain the fingerprint information of the finger.
  • an infrared cut Infrared Radiation Cut, IRC
  • the sensing unit of the optical fingerprint sensor is easy to saturate, which affects the performance of fingerprint detection. At this time, the impact on fingerprint detection in a strong light environment can be solved by reducing the cut-off wavelength of the IRC.
  • the reduction of the cut-off frequency of the IRC filter layer directly leads to the reduction of the red light component, which affects the identification of the authenticity of the finger by the optical fingerprint sensor, and is not conducive to the detection of strong light, thereby affecting the fingerprint The performance of the test.
  • the embodiments of the present application provide a fingerprint detection device and electronic equipment, which can improve the performance of fingerprint detection.
  • a fingerprint detection device which is arranged under the display screen of an electronic device for under-screen fingerprint detection, and the device includes:
  • the color filter layer includes multiple sets of color filter units, wherein each group of color filter units includes a red filter unit, and the red filter unit is used to transmit the red light signal returned by the finger;
  • the infrared filter layer is used to block the red light and infrared light above the cut-off wavelength, wherein the infrared filter layer is provided with an opening at a position corresponding to the red filter unit so as not to block the transmission of the light.
  • the optical fingerprint sensor is used to detect the light signal returning from the finger and passing through the color filter layer and the infrared filter layer, and the light signal is used to obtain the fingerprint image of the finger, wherein the light
  • the red light signal in the signal is used to determine the authenticity of the finger and/or is used for strong light detection.
  • each group of color filter units further includes a green filter unit and/or a blue filter unit.
  • the multiple groups of color filter units are arranged in an array on the color filter layer.
  • the red light signal transmitted by the red filter unit located at the edge area of the color filter layer in the plurality of color units is used to determine the authenticity of the finger, which is located at the
  • the red light signal transmitted by the red filter unit in the middle area of the color filter layer is used for strong light detection.
  • an opening is provided in the infrared filter layer at a position corresponding to the red filter unit in the edge area, and an opening is provided at a position corresponding to the red filter unit in the middle area. With or without openings.
  • the multiple groups of color filter units are distributed in an edge area of the color filter layer.
  • the filter unit in the edge area may correspond to at least one circle of optical sensing units on the edge of the optical fingerprint sensor.
  • the optical fingerprint sensor includes a plurality of optical sensing units, and each red filter unit in the color filter layer corresponds to one or more optical sensing units, and the one or more One optical sensing unit is used to detect the red light signal passing through the corresponding red filter unit.
  • a light path guiding structure is further included, and the light path guiding structure includes:
  • Micro lens array including multiple micro lenses
  • At least one light-blocking layer wherein each light-blocking layer has a plurality of openings corresponding to the plurality of microlenses respectively;
  • the microlens is used to converge the light signal returned from the finger to the corresponding opening in the light blocking layer, and transmit it to the optical fingerprint sensor through the corresponding opening in the light blocking layer.
  • the color filter layer is located below the microlens array, and the infrared filter layer is disposed between two light blocking layers.
  • the first light blocking layer in the at least one light blocking layer is integrated with the optical fingerprint sensor, and the infrared filter layer is disposed above the first light blocking layer .
  • the first light blocking layer and the infrared filter layer are connected through a transparent medium layer, and the infrared filter layer is formed on the upper surface of the transparent medium layer by coating. .
  • the second light blocking layer in the at least one light blocking layer is located between the color filter layer and the infrared filter layer.
  • the apertures of the openings in the second light blocking layer, the openings in the infrared filter layer, and the openings in the first light blocking layer are from top to bottom. Decrease in order.
  • the optical signal returned by the finger is a vertical optical signal or an oblique optical signal.
  • a fingerprint detection device which is arranged under the display screen of an electronic device for under-screen fingerprint detection, and the device includes:
  • the color filter layer includes a plurality of red filter units located at the edge area of the color filter layer, and the red filter unit is used to transmit the red light signal returned by the finger;
  • the infrared filter layer is used to block red light and infrared light above the cut-off wavelength, wherein the area of the infrared filter layer is smaller than the area of the color filter layer, so as not to block the red light passing through the edge area
  • the red light signal of the filter unit
  • the optical fingerprint sensor is used to detect the optical signal returned by the finger and transmitted through the color filter layer and the infrared filter layer, and the optical signal is used to obtain a fingerprint image of the finger, wherein the Among the optical signals, the red light signal that passes through the red filter unit in the edge area is used for strong light detection.
  • the color filter layer further includes multiple sets of color filter units located in the middle area of the color filter layer, wherein each group of color filter units includes a red filter unit, and The red filter unit is used to pass the red light signal returned by the finger.
  • each group of color filter units further includes a blue filter unit and/or a green filter unit.
  • an opening is provided in the infrared filter layer at a position corresponding to the red filter unit in the middle area, and the opening in the infrared filter layer is used to pass through
  • the red light signal among the light signals, the red light signal passing through the red filter unit in the middle area is used for fingerprint anti-counterfeiting.
  • the fingerprint sensor includes a plurality of optical sensing units, and each red filter unit in the color filter layer corresponds to one or more optical sensing units, and the one or more The optical sensing unit is used to detect the red light signal passing through the corresponding red filter unit.
  • a light path guiding structure is further included, and the light path guiding structure includes:
  • Micro lens array including multiple micro lenses
  • At least one light blocking layer wherein each light blocking layer has a plurality of openings corresponding to the plurality of microlenses respectively;
  • the microlens is used to converge the light signal returned from the finger to the corresponding opening in the light blocking layer, and transmit it to the optical fingerprint sensor through the corresponding opening in the light blocking layer.
  • the color filter layer is located below the microlens array, and the infrared filter layer is disposed between two light blocking layers.
  • the first light blocking layer in the at least one light blocking layer is integrated with the optical fingerprint sensor, and the infrared filter layer is disposed above the first light blocking layer .
  • the first light blocking layer and the infrared filter layer are connected through a transparent medium layer, and the infrared filter layer is formed on the upper surface of the transparent medium layer by coating. .
  • the second light blocking layer in the at least one light blocking layer is located between the color filter layer and the infrared filter layer.
  • the apertures of the openings in the second light blocking layer, the openings in the infrared filter layer, and the openings in the first light blocking layer are sequentially reduced from top to bottom. small.
  • the optical signal returned by the finger is a vertical optical signal or an oblique optical signal.
  • an electronic device including:
  • the fingerprint detection device in the first aspect or any possible implementation of the first aspect; or,
  • the fingerprint detection device in the second aspect or any possible implementation of the second aspect.
  • the infrared filter layer can block the red light and infrared light above its cut-off wavelength to avoid the influence of infrared light and red light on fingerprint detection, and the red filter unit in the color filter layer is used to transmit red light.
  • the optical signal is used to distinguish the authenticity of the fingerprint. Since openings are provided in the infrared filter layer at a position corresponding to the red filter unit to avoid blocking the red light signal passing through the red filter unit, while effectively realizing the function of the infrared filter layer, It will not affect the authenticity of the finger, and the red light signal passing through the red filter unit can also be used for strong light detection, thus improving the performance of fingerprint detection.
  • FIGS 1 and 2 are schematic diagrams of electronic devices to which the embodiments of the present application can be applied.
  • FIGS. 3 and 4 are schematic cross-sectional views of the electronic device shown in FIGS. 1 and 2 along the direction A-A', respectively.
  • Figure 5 shows the filtering of red light and infrared light by the built-in IRC and the external IRC.
  • Fig. 6 is a schematic block diagram of a fingerprint detection device according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of a color filter layer according to an embodiment of the present application.
  • FIG. 8 is a schematic diagram of a color filter layer according to an embodiment of the present application.
  • FIG. 9 is a schematic diagram of a color filter layer according to an embodiment of the present application.
  • Fig. 10 is a possible implementation of the fingerprint detection device shown in Fig. 6.
  • Fig. 11 is another possible implementation of the fingerprint detection device shown in Fig. 6.
  • the embodiments of this application can be applied to fingerprint systems, including but not limited to optical, ultrasonic or other fingerprint identification systems and medical diagnostic products based on optical, ultrasonic or other fingerprint imaging.
  • the embodiments of this application only take optical fingerprint systems as an example
  • the embodiments of the present application should not constitute any limitation, and the embodiments of the present application are also applicable to other systems that use optical, ultrasonic, or other imaging technologies.
  • the optical fingerprint system provided in the embodiments of this application can be applied to smart phones, tablet computers, mobile terminals with display screens, and other electronic devices; more specifically, in the above-mentioned devices, the optical fingerprint model The group can be set in a partial area or the entire area under the display screen to form an under-display/under-screen optical fingerprint system.
  • the optical fingerprint module can also be partially or fully integrated into the display screen of the electronic device to form an in-display/in-screen optical fingerprint system.
  • the under-screen optical fingerprint detection technology uses light returned from the top surface of the device's display component to perform fingerprint sensing and other sensing operations.
  • the returned light carries information about the object in contact with the top surface, such as a finger.
  • the optical fingerprint detection of the specific optical sensor module located under the display screen is realized.
  • the design of the optical sensor module can be such that the desired optical imaging can be achieved by appropriately configuring the optical elements for collecting and detecting the returned light.
  • FIG. 1 and 2 show schematic diagrams of electronic devices to which the embodiments of the present application can be applied.
  • 1 and FIG. 2 are schematic diagrams of the orientation of the electronic device 10
  • FIG. 3 and FIG. 4 are partial cross-sectional schematic diagrams of the electronic device 10 shown in FIG. 1 and FIG. 2 along the direction A-A', respectively.
  • the electronic device 10 includes a display screen 120 and an optical fingerprint module 130.
  • the optical fingerprint module 130 is arranged in a partial area below the display screen 120.
  • 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.
  • the embodiment of the present application also refers to the optical sensing unit as a pixel, a photosensitive pixel, a pixel unit, a sensing unit, etc. .
  • the area where the sensing array 133 is located or its sensing area is the fingerprint detection area 103 of the optical fingerprint module 130. As shown in FIG. 1, the fingerprint detection area 103 is located in the display area of the display screen 120.
  • the optical fingerprint module 130 can also be arranged in other positions, such as arranged on the side of the display screen 120 or the non-transmissive area on the edge of the electronic device 10, and the optical fingerprint module 130 can be designed to remove the light from the display screen through the optical path design.
  • the optical signal of at least part of the display area of 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 area of the fingerprint detection area 103 may be different from the area of the sensing array 133 of the optical fingerprint module 130, such as an optical path design for imaging through a lens, a reflective folding optical path design, or other optical path designs such as light convergence or reflection, so that the optical fingerprint
  • the area of the fingerprint detection area 103 of the module 130 is larger than the area of the sensing array 133 of the optical fingerprint module 130.
  • the fingerprint detection area 103 of the optical fingerprint module 130 can also be designed to be substantially the same as the area of the sensing array 133 of the optical fingerprint module 130.
  • the electronic device 10 adopting the above structure does not need to reserve space on the front side for the fingerprint button 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 basically expanded To the front of the entire electronic device 10.
  • the optical fingerprint module 130 includes a light detecting part 134 and an optical component 132.
  • the light detection part 134 includes a sensing array 133 and a reading circuit electrically connected to the sensing array 133 and other auxiliary circuits, which can be fabricated on a chip (Die) through a semiconductor process to form an optical fingerprint chip or an optical fingerprint sensor, Also called sensor chip or chip etc.
  • 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 above-mentioned optical sensing unit.
  • the optical component 132 may be disposed above the sensing array 133 of the light detecting part 134, which may specifically include a filter layer (Filter), a light guide layer or a light path guide 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 can be used to guide the reflected light reflected from the surface of the finger to the sensing array 133 for optical fingerprint detection.
  • the optical component 132 and the light detecting part 134 may be packaged in the same optical fingerprint component.
  • the optical component 132 and the light detecting 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 detecting part 134 is located, for example, the optical component 132 can be attached to the top of the chip, or Some components of the optical assembly 132 are integrated into the chip.
  • the light guide layer of the optical component 132 has various implementation schemes.
  • the light guide layer may specifically be a collimator (Collimator) layer fabricated on a semiconductor silicon wafer, which has a plurality of collimator units or an array of openings, and the collimator unit may be specifically small holes.
  • the reflected light reflected from the finger the light incident perpendicularly to the collimating unit can pass through the collimating unit and be received by the optical sensing unit below it, while the light with an excessively large incident angle passes through the collimating unit.
  • the multiple reflections are attenuated, so each optical sensing unit can basically only receive the reflected light reflected by the fingerprint lines directly above it. In this way, the sensing array 133 can detect the fingerprint image of the finger.
  • the light guide layer may also 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 is used to The reflected light reflected by the finger is condensed to the sensing array 133 of the light detecting part 134 below it, so that the sensing array 133 can perform imaging based on the reflected light, thereby obtaining a fingerprint image of the finger.
  • a pinhole may be formed in the optical path of the lens unit, and the pinhole may cooperate with 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 guide layer may also specifically adopt a micro-lens (Micro-Lens) layer.
  • the micro-lens layer has a micro-lens array formed by a plurality of micro-lenses, which may be formed on the light by a semiconductor growth process or other processes.
  • the detection 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 such as a dielectric layer or a passivation layer, can also be formed between the microlens layer and the sensing unit.
  • a light blocking layer with openings may be included between the microlens layer and the sensing unit.
  • the light blocking layer may also be called a light blocking layer or a shielding layer (LS), etc., wherein the opening Formed 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 to the opening through the micro lens Inside, and transmitted to the sensing unit through the opening, so as to perform optical fingerprint imaging.
  • LS shielding layer
  • 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 display screen 120 may be a display screen with a self-luminous display unit, such as an organic light-emitting diode (OLED) display screen or a micro-LED (Micro-LED) display screen.
  • OLED organic light-emitting diode
  • Micro-LED micro-LED
  • the optical fingerprint module 130 can use the OLED light source, which is a display unit of the OLED display screen 120 in the fingerprint detection area 103, as an excitation light source for optical fingerprint detection.
  • the display screen 120 emits a beam of light 111 to the 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 scattered inside the finger 140 to form scattering Light.
  • the above-mentioned reflected light and scattered light are also collectively referred to as reflected light. Since 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 sensing 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 implementing the optical fingerprint recognition function in the electronic device 10.
  • 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.
  • the optical fingerprint module 130 may be suitable for non-self-luminous display screens, such as liquid crystal display screens or other passively illuminated display screens.
  • the optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection.
  • the optical fingerprint module 130 can be specifically an infrared light source or a light source of invisible light of a specific wavelength, which can be arranged under the backlight module of the liquid crystal display or arranged in the edge area under the protective cover of the electronic device 10, and the optical fingerprint module 130 can be arranged with a liquid crystal panel Or under the edge area of the protective cover 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
  • 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 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.
  • 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 electronic device 10 may further include a circuit board, and the circuit board is arranged under the optical fingerprint module 130.
  • the optical fingerprint module 130 can be adhered to the circuit board through adhesive, and is electrically connected to the circuit board through bonding pads and metal wires.
  • the optical fingerprint module 130 can realize electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device 10 through a circuit board.
  • the optical fingerprint module 130 may receive the control signal of the processing unit of the electronic device 10 through the circuit board, and may also output the fingerprint detection signal from the optical fingerprint module 130 to the processing unit or the control unit of the terminal device 10 through the circuit board. Wait.
  • the optical fingerprint module 130 may include only 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 touch the finger when inputting a fingerprint. Press to a specific position of the fingerprint detection area 103, otherwise the optical fingerprint module 130 may not be able to collect fingerprint images, resulting in poor user experience.
  • the optical fingerprint module 130 may include multiple optical fingerprint sensors. The multiple optical fingerprint sensors can be arranged side by side under the display screen 120 in a splicing manner, and the sensing areas of the multiple optical fingerprint sensors collectively 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 120, 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 optical fingerprint module 130 in the electronic device 10 includes a plurality of optical fingerprint sensors, and the plurality of optical fingerprint sensors may be arranged side by side under the display screen 120 by means such as splicing. , And the sensing areas of multiple optical fingerprint sensors collectively constitute the fingerprint detection area 103 of the optical fingerprint module 130.
  • the optical assembly 132 may include multiple light guide layers, and each light guide layer corresponds to an optical fingerprint sensor, and is attached to the optical fingerprint sensor. Above the corresponding optical fingerprint sensor.
  • multiple optical fingerprint sensors may also share an integral light guide layer, that is, the light guide layer has an area large enough to cover the sensing array of the multiple optical fingerprint sensors.
  • the optical component 132 may also include other optical elements, such as a filter or other optical films, which may be arranged between the light guide layer and the optical fingerprint sensor, or between the display screen 120 and the guide. Between the optical layers, it is mainly used to isolate the influence of external interference light on optical fingerprint detection.
  • the filter 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 light guide layer, the filter can be separately provided for each optical fingerprint sensor to filter out interference light, or a large-area filter can also be used to cover multiple optical fingerprint sensors at the same time.
  • the light guide layer can also be replaced by an optical lens (Lens), and a small hole can be formed through a light-shielding material above the optical lens to cooperate with the optical lens to converge the fingerprint detection light to the optical fingerprint sensor below to realize fingerprint imaging.
  • each optical fingerprint sensor can be configured with an optical lens to perform fingerprint imaging, or multiple optical fingerprint sensors can also use the same optical lens to achieve light convergence and fingerprint imaging.
  • each optical fingerprint sensor may even have two sensing arrays (Dual Array) or multiple sensing arrays (Multi-Array), and two or more optical lenses can be configured to cooperate with two or more sensing arrays at the same time.
  • a sensing array performs optical imaging, thereby reducing the imaging distance and enhancing the imaging effect.
  • the light source illuminates the finger above the display screen, and the optical fingerprint sensor collects the light signal returned by the reflection or scattering of the finger, so as to obtain the fingerprint information of the finger.
  • red light and infrared light can interfere with fingerprint detection.
  • the red light and infrared light in the sunlight can directly pass through the finger to reach the optical fingerprint sensor, so that the light carrying the fingerprint signal is submerged in the background noise of red light and infrared light, and the fingerprint is detected Make an impact.
  • an infrared cut filter can be set on the optical path between the display screen and the optical fingerprint sensor to filter out the red light and infrared light.
  • the infrared cut filter is referred to as an infrared filter (Infrared Radiation Cut, IRC) or an infrared filter layer for short.
  • IRC Infrared Radiation Cut
  • the infrared filter layer can cut off the red light and infrared light in the wavelength band above the cut-off wavelength, and reduce the red light and infrared light entering the optical fingerprint sensor through outward reflection, thereby weakening the useful fingerprint detection of red light and infrared light Signal interference.
  • the external infrared filter layer will increase the thickness of the optical fingerprint module and may affect the appearance of the display under strong light.
  • a built-in infrared filter can be used.
  • the cut-off characteristics of the built-in infrared filter layer in the red and infrared light bands are not as good as those of the external infrared filter layer.
  • the transmittance of the built-in infrared filter layer to red light and infrared light is significantly higher than the transmittance of the external infrared filter layer to red light and infrared light. This makes the sensing unit of the optical fingerprint sensor easy to saturate.
  • the cut-off wavelength of the infrared filter layer can only be reduced, for example, the cut-off wavelength of the infrared filter layer is reduced from 615 nanometers to 605 nanometers.
  • the cut-off wavelength of the infrared filter layer will result in a significant reduction in the red light component entering the optical fingerprint sensor.
  • the reduction of the red light component may lead to a decrease in its anti-counterfeiting performance, and the drift and fluctuation of the red light component with temperature will also increase.
  • the reduction of the red light component may also make it impossible to accurately extract the strong light mark on some fingerprint images, but the image features are disturbed by the strong light, which causes the image signal to deviate from the normal range. , Increasing the difficulty of fingerprint image detection and fingerprint anti-counterfeiting.
  • the embodiment of the present application provides a fingerprint detection device, which effectively realizes the function of the infrared filter layer and does not affect fingerprint anti-counterfeiting and strong light detection.
  • Fig. 6 is a schematic block diagram of a fingerprint detection device according to an embodiment of the present application.
  • the fingerprint detection device is arranged under the display screen for under-screen fingerprint detection.
  • the fingerprint detection device 600 includes a color filter layer 610, an infrared filter layer 620 and an optical fingerprint sensor 630.
  • the embodiment of the present application provides two methods of the device 600, both of which can realize the function of the infrared filter layer and improve the performance of fingerprint anti-counterfeiting and/or strong light detection. They are described separately below.
  • the color filter layer 610 includes a plurality of groups of color filter units 611, wherein each group of color filter units 611 includes a red filter unit, and the red filter unit is used to transmit the red light signal returned by the finger.
  • the infrared filter layer 620 is used to block red light and infrared light above the cut-off wavelength. Wherein, the infrared filter layer 620 is provided with an opening at a position corresponding to the red filter unit, so as not to block the red light signal passing through the red filter unit.
  • the optical fingerprint sensor 630 is used to detect the light signal that the finger returns and passes through the color filter layer 610 and the infrared filter layer 620, and the light signal is used to obtain a fingerprint image of the finger.
  • the red light signal in the light signal is used to determine the authenticity of the finger and/or is used for strong light detection.
  • the infrared filter layer 620 can block the red light and infrared light above its cut-off wavelength to avoid the influence of infrared light and red light on fingerprint detection, and the red filter unit in the color filter layer 610 can transmit The red light signal is used to distinguish the authenticity of the fingerprint. Since the infrared filter layer 630 is provided with an opening at a position corresponding to the red filter unit to avoid blocking the red light signal passing through the red filter unit, the function of the infrared filter layer 620 is effectively realized. At the same time, the transmitted red light signal can be used to distinguish the authenticity of the finger and/or the strong light detection.
  • the cut-off wavelength of the infrared filter layer can be set lower without affecting fingerprint anti-counterfeiting and strong light detection.
  • the fingerprint detection device 600 may correspond to the aforementioned optical fingerprint module 130, and other details of the device 600 can refer to the aforementioned description of the optical fingerprint module 130.
  • the color filter layer 610 is also called a color filter (Colour Filer, CF), which is used to determine the authenticity of a finger. Since fake fingerprints made of silica gel and other materials are quite different from real fingerprints in terms of material, spectral characteristics, internal optical scattering, etc., fingerprint detection can be used to determine the authenticity of fingerprints. For example, the transmittance of fake fingerprints to light signals of different colors may be equal, while the transmittance of real fingerprints to light signals of different colors is obviously different; for another example, the transmittance of fake fingerprints to light signals of a certain color may be the same. The overrate is obviously different from the transmittance of a true fingerprint to the light signal of the color.
  • Cold Filer CF
  • each group of color filter units 611 in the color filter layer 610 may also include other color filter units, such as green filter units, blue filter units, and so on.
  • the multiple sets of color filter units 611 in the color filter layer 610 may be arranged in a certain manner. For example, as shown in FIG. 7, the multiple sets of color filter units 611 are arranged in an array in the color filter layer 610.
  • Each group of color filter units 611 in the color filter layer 610 shown in FIG. 7 includes a red filter unit (R), a green filter unit (G), and a blue filter unit (B).
  • each group of color filter units 611 For the filter units of different colors in each group of color filter units 611, they can be arranged in a certain manner to form a specific pattern (patten). For example, as shown in FIG. 7, the red filter units, the green filter units, and the blue filter units in each group of filter units 611 are alternately distributed, and there may be a certain distance between adjacent filter units.
  • the red filter unit, the green filter unit and the blue filter unit can respectively transmit a red light signal, a green light signal and a blue light signal. Since the green light signal and the blue light signal are not blocked by the infrared filter layer, they can reach the optical fingerprint sensor and be used for fingerprint anti-counterfeiting.
  • An opening is provided in the infrared filter layer 620 at a position corresponding to the red filter unit, so the red light signal can reach the optical fingerprint sensor 630 through the opening. In this way, the optical fingerprint sensor 630 can obtain sufficient red light signals to be used for fingerprint anti-counterfeiting and strong light detection.
  • the other regions 612 except for the red filter unit, the green filter unit, and the blue filter unit in FIG. 7 are the base of the color filter layer 610, and the base may be transparent or green, for example. After the light signal transmitted from the area 612 reaches the fingerprint sensor, it can be used to obtain a fingerprint image. In this way, while using the light signal transmitted by the area 612 to obtain the fingerprint image, the light signal transmitted by the red filter unit, the green filter unit and the blue filter unit are also used to achieve fingerprint anti-counterfeiting and improve the security of fingerprint detection. sex.
  • the red filter unit in each group of color filter units 611 can transmit more red light components, it can also be used for strong light detection.
  • a strong light environment such as an outdoor sunlight environment
  • the red light signal is more, while in an indoor or dark environment, the red light signal is less.
  • the fingerprint algorithm can be adjusted in the strong light environment to process other light signals detected by the optical fingerprint sensor. Get a more accurate fingerprint image.
  • the red light component in the optical signal returning from the finger and reaching the optical fingerprint sensor 630 is increased, and the increased red light component can be used for strong light. Detection and fingerprint anti-counterfeiting.
  • each group of color filter units 611 of the color filter layer 610 may further include one or more other colors.
  • each group of color filter units 611 in the color filter layer 610 includes a red filter unit and a blue filter unit, the transmitted red and blue signals are used for fingerprint anti-counterfeiting, and the area 612 is green or transparent.
  • each group of color filter units 611 may also have other distribution modes on the color filter layer 610, for example, each group of color filter units 611 forms a circular array, a diamond array, etc. on the color filter layer 610.
  • FIG. 8 is an example of another color filter layer 610. As shown in FIG. Among them, the multiple groups of color filter units 611 in FIG. 8 are distributed in the edge area of the color filter layer 610. In this way, it is only necessary to provide openings corresponding to the red filter unit on the edge of the infrared filter layer 620, which reduces the process complexity of the infrared filter layer 620.
  • the optical fingerprint sensor 630 in this embodiment includes a plurality of optical sensing units, and each red filter unit in the color filter layer corresponds to one or more optical sensing units, and the one or more optical sensing units are used for Detect the red light signal transmitted by the corresponding red filter unit.
  • each filter unit in each group of color filter units 611 corresponds to a different optical sensor unit.
  • the optical sensor unit corresponding to the red filter unit is used to detect the red light signal transmitted by the red filter unit
  • the optical sensor unit corresponding to the green filter unit is used to detect the green light transmitted by the green filter unit.
  • the optical sensor unit corresponding to the blue filter unit is used to detect the blue light signal transmitted by the blue filter unit.
  • the color filter layer 610 includes a plurality of red filter units located at the edge area of the color filter layer 610, and the red filter units are used to transmit the red light signal returned from the finger.
  • the infrared filter layer 620 is used to block red light and infrared light above the cut-off wavelength.
  • the area of the infrared filter layer 620 is smaller than the area of the color filter layer 610, so as not to block the red light signal passing through the red filter unit in the edge area.
  • the optical fingerprint sensor 630 is used to detect the light signal that the finger returns and passes through the color filter layer 610 and the infrared filter layer 620, and the light signal is used to obtain a fingerprint image of the finger.
  • the red light signal in the light signal that passes through the red filter unit in the edge area is used for strong light detection.
  • the infrared filter layer 620 can block red light and infrared light above its cut-off wavelength to avoid the influence of infrared light and red light on fingerprint detection, and the red filter unit in the color filter layer 610 is used to pass through Pass the red light signal for strong light detection. Since the area of the infrared filter layer 630 is set to be smaller than the area of the color filter layer 610, and the edge area of the color filter layer 610 is provided with a red filter unit. In this way, the infrared filter layer 630 will not block the red light signal transmitted by the red filter unit in the edge area, so that while the function of the infrared filter layer 620 is effectively realized, the red filter can be used to pass through the red filter. The red light signal of the light unit performs strong light detection.
  • the edge area of the color filter layer 610 is provided with a red filter unit 611.
  • Each red filter unit 611 shown in FIG. 9 can transmit red light signals. Since the area of the infrared filter layer 620 is smaller than the color filter layer 610, the red light will not be blocked by the infrared filter layer 620, so The optical fingerprint sensor 630 can obtain enough red light component and use it for strong light detection.
  • the area 612 other than the red filter unit 611 is the substrate of the color filter layer 610, and the substrate may be transparent or green, for example. After the light signal transmitted by the area 612 reaches the fingerprint sensor, it can be used to obtain a fingerprint image. In this way, while using the light signal transmitted by the area 612 to obtain the fingerprint image, the light signal transmitted by the red filter unit is also used to achieve strong light detection.
  • the edge area of the color filter layer 610 can also be provided with other color filter units, such as green filter units, blue filter units, and so on.
  • the transmitted red light signal can be used for strong light detection, but the effect of fingerprint anti-counterfeiting based on the red light signal is not the best. For this reason, filter units of multiple colors can be set in the edge area to increase the function of fingerprint anti-counterfeiting.
  • the edge area of the color filter layer 610 is provided with red filter units, green filter units, and blue filter units alternately arranged.
  • the area of the infrared filter layer 620 is smaller than the area 610 of the color filter layer 610, so as not to block the light signal transmitted by the edge region of the color filter layer 610.
  • the red filter unit, the green filter unit and the blue filter unit in the edge area can respectively transmit the red light signal, the green light signal and the blue light signal. Since the area of the infrared filter layer 620 is smaller than that of the color filter layer 610, the infrared filter layer 620 will not block the red light signal transmitted by the color filter layer 610, so that the red light signal can be combined with the green light signal.
  • the blue light signals arrive at the optical fingerprint sensor together, thereby realizing strong light detection and fingerprint anti-counterfeiting. After the light signal transmitted from the area 612 reaches the fingerprint sensor, it can be used to obtain a fingerprint image. In this way, while forming a fingerprint image, strong light detection and fingerprint anti-counterfeiting are also realized.
  • the middle area of the color filter layer 620 may be a substrate, for example, a transparent substrate.
  • the middle area of the color filter layer 620 may also be provided with multiple sets of color filter units 611 as shown in FIG. 7 or FIG. 8.
  • the red filter units in the edge area are used for strong light detection.
  • the color filter unit in the middle area is used for fingerprint anti-counterfeiting.
  • holes in the infrared filter 620 corresponding to the red filter unit may not be opened to reduce the process complexity of the infrared filter layer 620, but a certain fingerprint anti-counterfeiting performance may be sacrificed.
  • the embodiment of the present application does not limit the relative size of the middle area and the edge area.
  • the edge area is located outside the middle area, where the edge area of the color filter layer 610 corresponds to the optical sensing unit in the edge of the optical fingerprint sensor 630, and the middle area corresponds to the optical sensing unit in the middle of the optical fingerprint sensor 630.
  • the filter unit in the edge area may correspond to at least one circle of optical sensing unit on the edge of the optical fingerprint sensor, for example, one circle, two circle or three circle optical sensing unit.
  • one or more circles of black filter units can be arranged to absorb the light signal returned by the finger.
  • the one or more circles of the black filter unit may correspond to one or more circles of the optical sensing unit on the edge of the optical fingerprint sensor.
  • the optical signal collected by the optical sensor unit corresponding to the black filter unit is a noise signal. According to the noise signal, the optical signal collected by other sensor units can be processed, such as noise cancellation, so as to reduce the influence of noise on fingerprint detection.
  • the red light signal passing through the red filter unit at the edge of the color filter layer 610 is not blocked, thereby increasing the return of the finger.
  • the red light component in the optical signal and the added red light component can be used for strong light detection.
  • the optical fingerprint sensor 630 in this embodiment includes a plurality of optical sensing units, and each red filter unit in the color filter layer corresponds to one or more optical sensing units, and the one or more optical sensing units are used to detect the corresponding The red light signal transmitted by the red filter unit.
  • each red filter unit on the edge area of the color filter layer 610 corresponds to a different optical sensor unit, and each optical sensor unit can detect the red light transmitted by its corresponding red filter unit. Signal.
  • the respective optical sensing units corresponding to the middle area 612 are used to detect the light signals transmitted by the area 612.
  • the fingerprint detection device 600 may also include a light path guiding structure.
  • the light path guiding structure 640 includes a micro lens array 641 having a plurality of micro lenses, and at least one light blocking layer. Wherein, each light blocking layer has a plurality of openings corresponding to the plurality of microlenses, respectively.
  • the micro lens is used to converge the light signal returned by the finger to the corresponding opening in the light blocking layer, and transmit it to the optical fingerprint sensor 630 through the corresponding opening in the light blocking layer.
  • the above-mentioned color filter layer 610 may be located under the micro lens array 641.
  • the above-mentioned infrared filter layer 620 may be disposed between the two light blocking layers.
  • the bottom first light blocking layer 642 of the two light blocking layers is integrated with the optical fingerprint sensor 630.
  • the top metal layer of the optical fingerprint sensor 630 can be used as the first light-blocking layer 642, so that the first light-blocking layer 642 becomes a part of the optical fingerprint sensor 630.
  • the metal layer can be, for example, a circuit connection of the optical fingerprint sensor 630. Floor.
  • the infrared filter layer 620 may be disposed above the first light blocking layer 642.
  • the first light blocking layer 642 and the infrared filter layer 620 may be connected through a transparent medium layer 634, and the infrared filter layer 620 may be formed on the upper surface of the transparent medium layer 634 by coating.
  • the transparent medium layer 634 can also be used as a part of the optical fingerprint sensor 630 to cover the upper surface of the first light blocking layer 642 and fill the first light blocking layer An opening in layer 642.
  • the transparent medium layer 634 can be used as a protection function, for example, for protecting the optical fingerprint sensor 630.
  • the second light blocking layer 643 of the two light blocking layers may be disposed between the color filter layer 610 and the infrared filter layer 620.
  • the device 600 is arranged under the display screen 650.
  • the device 600 includes a microlens array 641, a color filter layer 610, a second light blocking layer 643, an infrared filter layer 620, a first light blocking layer 642, and an optical fingerprint sensor 630 in order from top to bottom.
  • the color filter layer 610 includes a red filter unit 6111, a green filter unit 6112, and a blue filter unit 6113. It is assumed that there is no space between the red filter unit 6111, the green filter unit 6112 and the blue filter unit 6113. .
  • An opening B is provided on the infrared filter layer 620 at a position corresponding to the red filter unit 6111.
  • the micro lens array 641 includes a plurality of micro lenses, such as micro lens 6411 to micro lens 6413.
  • the optical fingerprint sensor 630 includes a plurality of optical sensing units, for example, the optical sensing unit 631 to the optical sensing unit 633.
  • the light signal returned by the finger passes through the microlens 6411 and reaches the red filter unit 6111 in the color filter layer 610, and the red filter unit 6111 filters it to obtain a red light signal.
  • the red light signal sequentially passes through the opening A on the second light blocking layer 643, the opening B in the infrared filter layer 620, and the opening C on the first light blocking layer 642, and finally reaches the optical sensing unit 631;
  • the light signal converged by the microlens 6412 reaches the green filter unit 6112 in the color filter layer 610 to obtain a green light signal.
  • the light layer 620 and the corresponding openings on the first light blocking layer 642 reach the optical sensing unit 632; the light signal condensed by the microlens 6413 reaches the blue filter unit 6113 in the color filter layer 610 to obtain a blue light signal.
  • the blue light signal sequentially passes through the corresponding openings on the second light blocking layer 643, the infrared filter layer 620, and the corresponding openings on the first light blocking layer 642, and reaches the optical sensing unit 633.
  • the infrared filter layer 620 Since the infrared filter layer 620 only blocks red light and infrared light, it does not block blue light and green light. Therefore, in the infrared filter layer 620, an opening may be provided only at a position corresponding to the red filter unit 6111. Of course, if openings are also provided in the infrared filter layer 620 at positions corresponding to the green filter unit 6112 and the blue filter unit 6113, it is not impossible.
  • the red component in the optical signal collected by the optical sensing unit 631, the optical sensing unit 632, and the optical sensing unit 633 is used for fingerprint anti-counterfeiting and/or strong light detection. Based on fingerprint anti-counterfeiting, it can be judged whether the fingerprint image is from a living finger. Moreover, based on the result of the strong light detection, the fingerprint image can be corrected, so that an accurate fingerprint image can be obtained even in a strong light environment.
  • the apertures of the apertures A in the second light blocking layer 643, the apertures B in the infrared filter layer, and the apertures C in the first light blocking layer 642 can be set to Decrease sequentially to the bottom. In this way, the optical signal within a certain angle range can be guided to the corresponding optical sensing unit.
  • the optical fingerprint sensor 630 can obtain a relatively small intensity of the light signal, so it is not suitable for strong light detection.
  • the optical sensor unit corresponding to the red filter unit can obtain sufficient red light.
  • the light signal, the light signal returned from the area covered by the finger can also be used for strong light detection.
  • the optical fingerprint sensor 630 can have more strong light components, so it can assist in determining the pressing position of the finger and facilitate subsequent execution of the fingerprint algorithm.
  • Figure 10 shows an optical path for fingerprint detection using an inclined optical path.
  • a vertical optical path may also be used for fingerprint detection, for example, as shown in FIG. 11.
  • FIG. 11 For details of each structure in FIG. 11, reference may be made to the description in FIG. 11. For brevity, details are not repeated here.
  • An embodiment of the present application also provides an electronic device, which includes the fingerprint detection device 600 in the foregoing various embodiments of the present application.
  • the electronic device may also include a display screen, for example, it may be a common non-folding display screen, or it may be a foldable display screen or called a flexible display screen.
  • the electronic devices in the embodiments of the present application may be portable or mobile computing devices such as terminal devices, mobile phones, tablet computers, notebook computers, desktop computers, game devices, in-vehicle electronic devices or wearable smart devices, and Electronic databases, automobiles, bank automated teller machines (Automated Teller Machine, ATM) and other electronic equipment.
  • the wearable smart device includes full-featured, large-sized devices that can achieve complete or partial functions without relying on smart phones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to interact with other devices such as smart phones.
  • Cooperating equipment such as all kinds of smart bracelets, smart jewelry and other equipment for physical sign monitoring.

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Abstract

La présente invention concerne un appareil de détection d'empreintes digitales, qui permet d'améliorer la performance de détection d'empreintes digitales. Ledit appareil est disposé sous un écran d'affichage d'un dispositif électronique et sert à détecter des empreintes digitales sous-écran. Ledit appareil comprend : une couche de filtres colorés, comprenant de multiples groupes d'unités filtres colorés, chaque groupe d'unités filtres colorés comprenant une unité filtre rouge, et l'unité filtre rouge servant à transmettre un signal de lumière rouge renvoyé par un doigt ; une couche de filtre infrarouge, servant à bloquer la lumière rouge et la lumière infrarouge ayant une longueur d'onde coupée supérieure à celle de la couche de filtre infrarouge, une ouverture étant ménagée au niveau d'une position de la couche de filtre infrarouge correspondant aux unités filtres rouges, de façon à ne pas bloquer la transmission de signal de lumière rouge à travers l'unité filtre rouge ; et un capteur optique d'empreintes digitales, servant à détecter un signal optique renvoyé par le doigt et traversant la couche de filtres colorés et la couche de filtre infrarouge, le signal optique servant à acquérir une image d'empreinte digitale du doigt, et le signal de lumière rouge véhiculé dans le signal optique servant à déterminer l'authenticité du doigt et/ou à une détection de forte lumière.
PCT/CN2020/081847 2020-03-27 2020-03-27 Appareil de détection d'empreintes digitales et dispositif électronique WO2021189478A1 (fr)

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