WO2021189478A1 - 指纹检测的装置和电子设备 - Google Patents

指纹检测的装置和电子设备 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
Prior art date
Application number
PCT/CN2020/081847
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English (en)
French (fr)
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
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.)
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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 CN202080001570.6A priority Critical patent/CN111837132B/zh
Priority to PCT/CN2020/081847 priority patent/WO2021189478A1/zh
Publication of WO2021189478A1 publication Critical patent/WO2021189478A1/zh

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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

本申请提供一种指纹检测的装置，能够提高指纹检测的性能。该装置设置于电子设备的显示屏下方，以用于屏下指纹检测，所述装置包括：彩色滤光层，包括多组彩色滤光单元，其中每组彩色滤光单元包括红色滤光单元，所述红色滤光单元用于透过手指返回的红光信号；红外滤光层，用于阻挡其截止波长以上的红光和红外光，其中，所述红外滤光层中与所述红色滤光单元对应的位置上设置有开孔，以不阻挡透过所述红色滤光单元的所述红光信号；光学指纹传感器，用于检测所述手指返回并透过所述彩色滤光层和所述红外滤光层的光信号，所述光信号用于获取所述手指的指纹图像，其中，所述光信号中的所述红光信号用于确定所述手指的真伪和/或用于强光检测。

Description

指纹检测的装置和电子设备 技术领域
本申请实施例涉及生物特征识别领域，并且更具体地，涉及一种指纹检测的装置和电子设备。
背景技术
在进行光学指纹检测时，光源照射显示屏上方的手指，光学指纹传感器采集经该手指反射或散射而返回的光信号，从而获取该手指的指纹信息。为了避免红光和红外光会对指纹检测造成的干扰，需要设置红外截止(Infrared Radiation Cut，IRC)滤光层。在强光环境下，光学指纹传感器的感应单元容易饱和，影响指纹检测的性能，这时可以通过降低IRC的截止波长解决强光环境下对指纹检测的影响。但是当采用彩色滤光层实现指纹防伪时，IRC滤光层的截止频率的降低直接导致红光分量减少，进而影响光学指纹传感器对手指真伪的判别，并且不利于强光检测，从而影响指纹检测的性能。
发明内容
本申请实施例提供一种指纹检测的装置和电子设备，能够提升指纹检测的性能。
第一方面，提供了一种指纹检测的装置，设置于电子设备的显示屏下方，以用于屏下指纹检测，所述装置包括：
彩色滤光层，包括多组彩色滤光单元，其中每组彩色滤光单元包括红色滤光单元，所述红色滤光单元用于透过手指返回的红光信号；
红外滤光层，用于阻挡其截止波长以上的红光和红外光，其中，所述红外滤光层中与所述红色滤光单元对应的位置上设置有开孔，以不阻挡透过所述红色滤光单元的所述红光信号；
光学指纹传感器，用于检测所述手指返回并透过所述彩色滤光层和所述红外滤光层的光信号，所述光信号用于获取所述手指的指纹图像，其中，所述光信号中的所述红光信号用于确定所述手指的真伪和/或用于强光检测。
在一种可能的实现方式中，所述每组彩色滤光单元还包括绿色滤光单元和/或蓝色滤光单元。
在一种可能的实现方式中，所述多组彩色滤光单元在所述彩色滤光层上阵列式分布。
在一种可能的实现方式中，所述多组彩色单元中位于所述彩色滤光层的边缘区域的红色滤光单元透过的红光信号用于确定所述手指的真伪，位于所述彩色滤光层的中间区域的红色滤光单元透过的红光信号用于强光检测。
在一种可能的实现方式中，所述红外滤光层中与所述边缘区域的红色滤光单元对应的位置上设置有开孔，与所述中间区域的红色滤光单元对应的位置上设置有开孔或者不设置开孔。
在一种可能的实现方式中，所述多组彩色滤光单元分布于所述彩色滤光层的边缘区域。
在一种可能的实现方式中，所述边缘区域的滤光单元可以对应于所述光学指纹传感器边缘的至少一圈光学感应单元。
在一种可能的实现方式中，所述光学指纹传感器包括多个光学感应单元，所述彩色滤光层中的每个红色滤光单元对应于一个或多个光学感应单元，所述一个或多个光学感应单元用于检测透过对应的红色滤光单元的红光信号。
在一种可能的实现方式中，还包括光路引导结构，所述光路引导结构包括：
微透镜阵列，包括多个微透镜；
至少一个挡光层，其中每个挡光层上具有与所述多个微透镜分别对应的多个开孔；
其中，所述微透镜用于将所述手指返回的光信号会聚到所述挡光层中对应的开孔，并通过所述挡光层中对应的开孔传输至所述光学指纹传感器。
在一种可能的实现方式中，所述彩色滤光层位于所述微透镜阵列的下方，所述红外滤光层设置于两个挡光层之间。
在一种可能的实现方式中，所述至少一个挡光层中的第一挡光层与所述光学指纹传感器集成在一起，所述红外滤光层设置在所述第一挡光层的上方。
在一种可能的实现方式中，所述第一挡光层与所述红外滤光层之间通过透明介质层连接，所述红外滤光层通过镀膜方式形成在所述透明介质层的上表面。
在一种可能的实现方式中，所述至少一个挡光层中的第二挡光层位于所述彩色滤光层与所述红外滤光层之间。
在一种可能的实现方式中，所述第二挡光层中的开孔、所述红外滤光层中的开孔、以及所述第一挡光层中的开孔的孔径由上至下依次减小。
在一种可能的实现方式中，所述手指返回的光信号为垂直光信号或者倾斜光信号。
第二方面，提供了一种指纹检测的装置，设置于电子设备的显示屏下方，以用于屏下指纹检测，所述装置包括：
彩色滤光层，包括位于所述彩色滤光层的边缘区域的多个红色滤光单元，所述红色滤光单元用于透过手指返回的红光信号；
红外滤光层，用于阻挡其截止波长以上的红光和红外光，其中，所述红外滤光层的面积小于所述彩色滤光层的面积，以不阻挡透过所述边缘区域的红色滤光单元的所述红光信号；
光学指纹传感器，用于检测所述手指返回的并透过所述彩色滤光层和所述红外滤光层的光信号，所述光信号用于获取所述手指的指纹图像，其中，所述光信号中的透过所述边缘区域的红色滤光单元的所述红光信号用于强光检测。
在一种可能的实现方式中，所述彩色滤光层还包括位于所述彩色滤光层的中间区域的多组彩色滤光单元，其中每组彩色滤光单元包括红色滤光单元，所述红色滤光单元用于透过手指返回的红光信号。
在一种可能的实现方式中，所述每组彩色滤光单元还包括蓝色滤光单元和/或绿色滤光单元。
在一种可能的实现方式中，所述红外滤光层中与所述中间区域的红色滤光单元对应的位置上设置有开孔，所述红外滤光层中的开孔用于透过所述红光信号，所述光信号中的透过所述中间区域的红色滤光单元的所述红光信号用于指纹防伪。
在一种可能的实现方式中，所述指纹传感器包括多个光学感应单元，所述彩色滤光层中的每个红色滤光单元对应于一个或多个光学感应单元，所述一个或多个光学感应单元用于检测透过对应的红色滤光单元的红光信号。
在一种可能的实现方式中，还包括光路引导结构，所述光路引导结构包括：
微透镜阵列，包括多个微透镜；
至少一个挡光层，其中每个挡光层上具有与所述多个微透镜分别对应的 多个开孔；
其中，所述微透镜用于将所述手指返回的光信号会聚到所述挡光层中对应的开孔，并通过所述挡光层中对应的开孔传输至所述光学指纹传感器。
在一种可能的实现方式中，所述彩色滤光层位于所述微透镜阵列的下方，所述红外滤光层设置于两个挡光层之间。
在一种可能的实现方式中，所述至少一个挡光层中的第一挡光层与所述光学指纹传感器集成在一起，所述红外滤光层设置在所述第一挡光层的上方。
在一种可能的实现方式中，所述第一挡光层与所述红外滤光层之间通过透明介质层连接，所述红外滤光层通过镀膜方式形成在所述透明介质层的上表面。
在一种可能的实现方式中，所述至少一个挡光层中的第二挡光层位于所述彩色滤光层与所述红外滤光层之间。
在一种可能的实现方式中，所述第二挡光层中的开孔、红外滤光层中的开孔、以及所述第一挡光层中的开孔的孔径由上至下依次减小。
在一种可能的实现方式中，所述手指返回的光信号为垂直光信号或者倾斜光信号。
第三方面，提供了一种电子设备，包括：
第一方面或第一方面的任意可能的实现方式中的指纹检测的装置；或者，
第二方面或第二方面的任意可能的实现方式中的指纹检测的装置。
基于上述技术方案，红外滤光层可以阻挡其截止波长以上的红光和红外光，避免红外光和红光对指纹检测的影响，而彩色滤光层中的红色滤光单元用于透过红光信号，以用于指纹真伪的判别。由于在红外滤光层中与该红色滤光单元对应的位置设置开孔，以避免对透过该红色滤光单元的红光信号造成阻挡，从而在有效实现红外滤光层的功能的同时，不会对手指真伪判别造成影响，而且透过该红色滤光单元的红光信号还可以用于进行强光检测，因此提高了指纹检测的性能。
附图说明
图1和图2是本申请实施例可以适用的电子设备的示意图。
图3和图4分别是图1和图2所示的电子设备沿A-A’方向的剖面示意图。
图5是内置IRC和外置IRC对红光和红外光的滤波情况。
图6是本申请实施例的指纹检测的装置的示意性框图。
图7是本申请实施例的彩色滤光层的示意图。
图8是本申请实施例的彩色滤光层的示意图。
图9是本申请实施例的彩色滤光层的示意图。
图10是图6所示的指纹检测装置的一种可能的实现方式。
图11是图6所示的指纹检测装置的另一种可能的实现方式。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
应理解，本申请实施例可以应用于指纹***，包括但不限于光学、超声波或其他指纹识别***和基于光学、超声波或其他指纹成像的医疗诊断产品，本申请实施例仅以光学指纹***为例进行说明，但不应对本申请实施例构成任何限定，本申请实施例同样适用于其他采用光学、超声波或其他成像技术的***等。
作为一种常见的应用场景，本申请实施例提供的光学指纹***可以应用在智能手机、平板电脑、具有显示屏的移动终端、以及其他电子设备；更具体地，在上述设备中，光学指纹模组可以设置在显示屏下方的局部区域或者全部区域，从而形成屏下(Under-display/Under-screen)光学指纹***。或者，所述光学指纹模组也可以部分或者全部集成至所述电子设备的显示屏内部，从而形成屏内(In-display/In-screen)光学指纹***。
屏下光学指纹检测技术使用从设备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。该返回的光中携带与该顶面接触的物体例如手指的信息，通过采集和检测该手指返回的光，实现位于显示屏下方的特定光学传感器模块的光学指纹检测。光学传感器模块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。
图1和图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和图2为电子设备10的定向示意图，图3和图4分别为图1和图2所示的电子设备10沿A-A’方向的部分剖面示意图。
电子设备10包括显示屏120和光学指纹模组130。其中，所述光学指纹模组130设置在显示屏120下方的局部区域。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的感应阵列 133，本申请实施例也将该光学感应单元称为像素、感光像素、像素单元、感应单元等。感应阵列133所在区域或者其感应区域为光学指纹模组130的指纹检测区域103。如图1所示，指纹检测区域103位于显示屏120的显示区域之中。在一种替代的实施例中，光学指纹模组130还可以设置在其他位置，比如设置在显示屏120的侧面或者电子设备10的边缘的非透光区域，并通过光路设计来将来自显示屏120的至少部分显示区域的光信号导引到光学指纹模组130，从而使得指纹检测区域103实际上位于显示屏120的显示区域。
应理解，指纹检测区域103的面积可以与光学指纹模组130的感应阵列133的面积不同，例如通过透镜成像的光路设计、反射式折叠光路设计或者其他光线会聚或者反射等光路设计，使得光学指纹模组130的指纹检测区域103的面积大于光学指纹模组130的感应阵列133的面积。在其他替代的实现方式中，如果采用例如光线准直等方式进行光路引导，那么光学指纹模组130的指纹检测区域103也可以设计成与光学指纹模组130的感应阵列133的面积基本一致。
因此，用户在需要对电子设备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例如Home键，从而可以采用全面屏的方案，即显示屏120的显示区域可以基本扩展到整个电子设备10的正面。
作为一种可选的实现方式，如图2所示，光学指纹模组130包括光检测部分134和光学组件132。其中，光检测部分134包括感应阵列133以及与感应阵列133电性连接的读取电路及其他辅助电路，其可以通过半导体工艺制作在一个芯片(Die)上，形成光学指纹芯片或者光学指纹传感器，也称为传感器芯片或芯片等。感应阵列133具体为光探测器(Photodetector)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如上所述的光学感应单元。其中，光学组件132可以设置在光检测部分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可以用于将从手指表面反射回来的反射光导引至感应阵列133以进行光学指纹检测。
在具体实现上，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。例如，光学组件132可以与光检测部分134封装在同一个光学指纹芯片，也可以将光学组件132设置在光检测部分134所在的芯片外部，比如将光学组件132贴合在该芯片的上方，或者将光学组件132的部分元件集成在该芯片之中。
其中，光学组件132的导光层有多种实现方案。例如，该导光层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开孔阵列，该准直单元可以具体为小孔。在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该准直单元并被其下方的光学感应单元接收，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，因此每一个光学感应单元基本只能接收到其正上方的指纹纹路反射回来的反射光，这样，感应阵列133便可以检测出该手指的指纹图像。
在另一种实现方式中，该导光层也可以为光学透镜(Lens)层，其具有一个或多个透镜单元，例如由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会聚到其下方的光检测部分134的感应阵列133，使得感应阵列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。可选地，该透镜单元的光路中还可以形成有针孔，该针孔可以配合该光学透镜层从而扩大光学指纹模组130的视场，以提高光学指纹模组130的指纹成像效果。
在其他实现方式中，导光层也可以具体采用微透镜(Micro-Lens)层，该微透镜层具有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感应阵列133的其中一个感应单元。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。进一步地，该微透镜层和该感应单元之间还可以包括具有开孔的挡光层，该挡光层也可以称为阻光层或者遮光层(Shielding Layer，LS)等，其中该开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会聚到该开孔内部，并经由该开孔传输到该感应单元，从而进行光学指纹成像。
应理解，上述导光层的几种实现方案可以单独使用也可以结合使用。例如，可以在准直器层或者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。
本申请实施例中，显示屏120可以采用具有自发光显示单元的显示屏，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。以采用OLED显示屏为例，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按压在指纹检测区域103时，显示屏120向指纹检测区域103上方的手指140发出一束光111，光111在手指140的表面发生反射形成反射光或者经过手指140内部散射而形成散射光。在相关专利申请中，为便于描述，也将上述反射光和散射光统称为反射光。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接收并转换为相应的电信号，即指纹检测信号。基于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中实现光学指纹识别功能。
在其他实现方式中，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的光信号。在这种情况下，光学指纹模组130可以适用于非自发光显示屏，例如液晶显示屏或者其他的被动发光的显示屏。以应用在具有背光模组和液晶面板的液晶显示屏为例，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光学指纹模组130；或者，光学指纹模组130也可以设置在背光模组下方，且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光学指纹模组130。当采用光学指纹模组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。
应理解，在具体实现上，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，其位于显示屏120的上方并覆盖电子设备10的正面。因此，本申请实施例中，所谓的手指按压在显示屏120实际上是指按压在显示屏120上方的盖板或者覆盖该盖板的保护层表面。
进一步地，电子设备10还可以包括电路板，电路板设置在光学指纹模组130的下方。光学指纹模组130可以通过背胶粘接在电路板上，并通过焊盘及金属线焊接与电路板实现电性连接。光学指纹模组130可以通过电路板实现与其他***电路或者电子设备10的其他元件的电性互连和信号传输。例如，光学指纹模组130可以通过电路板接收电子设备10的处理单元的控制信号，并且还可以通过电路板将来自光学指纹模组130的指纹检测信号输出给终端设备10的处理单元或者控制单元等。
在某些实现方式中，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所述指纹检测区域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，光学指纹模组130可以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的方式并排设置在显示屏120的下方，且该多个光学指纹传感器的感应区域共同构成光学指纹模组130的指纹检测区域103。从而光学指纹模组130的指纹检测区域103可以扩展到显示屏120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，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。
例如图3和图4所示的电子设备10，电子设备10中的光学指纹模组130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例如拼接等方式并排设置在显示屏120的下方，且多个光学指纹传感器的感应区域共同构成光学指纹模组130的指纹检测区域103。
可选地，与光学指纹模组130的多个光学指纹传感器相对应，光学组件132中可以包括多个导光层，每个导光层分别对应一个光学指纹传感器，并分别贴合设置在其对应的光学指纹传感器的上方。或者，多个光学指纹传感器也可以共享一个整体的导光层，即该导光层具有一个足够大的面积以覆盖多个光学指纹传感器的感应阵列。
另外，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，其可以设置在该导光层和该光学指纹传感器之间，或者设置在显示屏120与该导光层之间，主要用于隔离外界干扰光对光学指纹检测的影响。其中，该滤光片可以用于滤除穿透手指并经过显示屏120进入光学指纹传感器的环境光。与该导光层相类似，该滤光片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片同时覆盖多个光学指纹传感器。
该导光层也可以采用光学镜头(Lens)来代替，该光学镜头上方可以通过遮光材料形成小孔配合该光学镜头将指纹检测光会聚到下方的光学指纹传感器以实现指纹成像。类似地，每一个光学指纹传感器可以分别配置一个光学镜头以进行指纹成像，或者，多个光学指纹传感器也可以利用同一个光学镜头来实现光线会聚和指纹成像。在其他替代实施例中，每一个光学指纹传感器甚至还可以具有两个感应阵列(Dual Array)或者多个感应阵列(Multi-Array)，且同时配置两个或多个光学镜头配合两个或多个感应阵列进行光学成像，从而减小成像距离并增强成像效果。
在进行指纹检测时，光源照射显示屏上方的手指，光学指纹传感器采集经该手指反射或散射而返回的光信号，从而获取该手指的指纹信息。但是，由于红光和红外光会对指纹检测造成干扰。例如，在室外进行指纹检测时，太阳光中的红光和红外光可以直接透过手指到达光学指纹传感器，使得携带指纹信号的光线湮没在红光和红外光的背景噪声之中，对指纹检测造成影响。
为了减少红光和红外光对指纹检测的影响，可以在显示屏和光学指纹传感器之间的光路上设置红外截止滤光，以对红光和红外光进行滤除。以下将该红外截止滤光片简称为红外滤光片(Infrared Radiation Cut，IRC)或者红外滤光层。例如，红外滤光层可以将其截止波长以上波段的红光和红外光截止，通过向外反射来减少进入光学指纹传感器的红光和红外光，从而削弱红光和红外光对有用的指纹检测信号的干扰。
外置的红外滤光层会引起光学指纹模组厚度的增加，并且在强光下可能影响了显示屏的外观。为此，可以采用内置的红外滤光层。但是，内置的红外滤光层在红光和红外光波段的截止特性没有外置的红外滤光层好。例如图5所示，内置的红外滤光层对红光和红外光的透过率，明显高于外置的红外滤光层对红光和红外光的透过率。这样会使光学指纹传感器的感应单元容易 发生饱和。这时，为了避免强光问题，只能降低红外滤光层的截止波长，例如将其截止波长从615纳米降低到605纳米。
但是，降低红外滤光层的截止波长会导致进入光学指纹传感器的红光分量明显减少。当利用彩色滤光片层进行指纹防伪时，红光分量的减少可能导致其防伪性能的下降，同时红光分量随温度的漂移和波动也会增加。
另一方面，当需要进行强光检测时，红光分量的减少也可能使得有些指纹图像上无法准确地提取到强光标识，但图像特征又被强光干扰，从而导致图像信号等偏离正常区间，增加了指纹图像检测和指纹防伪的难度。
为此，本申请实施例提供了一种指纹检测的装置，有效地实现了红外滤光层的功能并且不会对指纹防伪和强光检测造成影响。
图6是本申请实施例的指纹检测的装置的示意性框图。该指纹检测的装置设置于显示屏下方，以用于屏下指纹检测。如图6所示，该指纹检测的装置600包括彩色滤光层610，红外滤光层620和光学指纹传感器630。
本申请实施例提供了装置600的两种方式，均能够在实现红外滤光层的功能的同时，提高指纹防伪和/或强光检测的性能。下面分别进行描述。
方式1
彩色滤光层610包括多组彩色滤光单元611，其中每组彩色滤光单元611包括红色滤光单元，该红色滤光单元用于透过手指返回的红光信号。
红外滤光层620用于阻挡其截止波长以上的红光和红外光。其中，红外滤光层620中与该红色滤光单元对应的位置上设置有开孔，以不阻挡透过该红色滤光单元的该红光信号。
光学指纹传感器630用于检测该手指返回并透过彩色滤光层610和红外滤光层620的光信号，该光信号用于获取手指的指纹图像。其中，该光信号中的红光信号用于确定该手指的真伪和/或用于强光检测。
该实施例中，红外滤光层620可以阻挡其截止波长以上的红光和红外光，避免红外光和红光对指纹检测的影响，而彩色滤光层610中的红色滤光单元可以透过红光信号，以用于指纹真伪的判别。由于红外滤光层630中与该红色滤光单元对应的位置上设置有开孔，以避免对透过该红色滤光单元的红光信号造成阻挡，从而在有效实现红外滤光层620的功能的同时，可以利用透过的红光信号进行手指真伪的判别和/或强光检测。
这样，红外滤光层的截止波长就可以设置的较低，而不会影响对指纹防 伪和强光检测带来影响。
应理解，该指纹检测的装置600可以对应于前述的光学指纹模组130，装置600的其他细节可以参考前述针对光学指纹模组130的描述。
彩色滤光层610也称为彩色滤光片(Colour Filer，CF)，其用于进行手指真伪的判别。由于采用硅胶等材料制成的假指纹与真手指的指纹在材质、光谱特性、内部光学散射等方面差异较大，据此可以在进行指纹检测判别指纹的真伪。例如，假指纹对不同颜色的光信号的透过率可能相等，而真指纹对不同颜色的光信号的透过率之间存在明显差异；又例如，假指纹对某种颜色的光信号的透过率，与真指纹对该颜色的光信号的透过率明显不同。
除了红色滤光单元，进一步地，彩色滤光层610中的每组彩色滤光单元611中还可以包括其他颜色的滤光单元，例如还包括绿色滤光单元、蓝色滤光单元等等。
彩色滤光层610中的多组彩色滤光单元611可以按照一定方式排布，例如图7所示，多组彩色滤光单元611在彩色滤光层610中呈阵列式分布。
图7所示的彩色滤光层610中的每组彩色滤光单元611包括红色滤光单元(R)、绿色滤光单元(G)和蓝色滤光单元(B)。
对于每组彩色滤光单元611中的不同颜色的滤光单元而言，可以按照一定方式排布，形成特定的图案(patten)。例如图7所示，每组滤光单元611中的红色滤光单元、绿色滤光单元和蓝色滤光单元交替分布，并且相邻滤光单元之间可以存在一定间距。
其中，红色滤光单元、绿色滤光单元和蓝色滤光单元分别可以透过红光信号、绿光信号和蓝光信号。该绿光信号和该蓝光信号由于不受红外滤光层的阻挡，可以到达光学指纹传感器，并用于指纹防伪。而红外滤光层620中与该红色滤光单元对应的位置设置有开孔，因此该红光信号可以通过该开孔到达光学指纹传感器630。这样，光学指纹传感器630就可以获得足够的红光信号，从而用于指纹防伪和强光检测。
图7中除红色滤光单元、绿色滤光单元和蓝色滤光单元之外的其他区域612均为彩色滤光层610的基底，该基底例如可以是透明的或者绿色的。从区域612透过的光信号达到指纹传感器后，可以用来获取指纹图像。这样，在利用区域612透过的光信号获取指纹图像的同时，也利用红色滤光单元、绿色滤光单元和蓝色滤光单元透过的光信号实现了指纹防伪，提高了指纹检 测的安全性。
由于每组彩色滤光单元611中的红色滤光单元可以透过较多的红光分量，因此还可以用于强光检测。在强光环境例如室外太阳光环境下，用户在进行指纹检测时，红光信号较多，而在室内或较暗环境下，红光信号较少。可以根据光学指纹传感器检测到的红光信号的强弱，判断当前用户是否处于强光环境，并在处于强光环境时调整指纹算法，以对光学指纹传感器检测到的其他光信号进行处理，从而得到更加精准的指纹图像。
可见，方式1中通过在红外滤光层620上设置开孔的方式，增加了手指返回并能够到达光学指纹传感器630的光信号中的红光分量，而增加的红光分量可以用于强光检测和指纹防伪。
图7所示的彩色滤光层610仅为示例，在实际应用中，彩色滤光层610的各组彩色滤光单元611中还可以包括其他一种或多种颜色。例如，彩色滤光层610中的每组彩色滤光单元611中包括红色滤光单元和蓝色滤光单元，其透过的红光信号和蓝光信号用于指纹防伪，而区域612为绿色或透明。
并且，各组彩色滤光单元611还可以在彩色滤光层610上具有其他的分布方式，例如各组彩色滤光单元611在彩色滤光层610上形成圆形阵列、菱形阵列等。
图8是另一种彩色滤光层610的示例。其中，图8中的多组彩色滤光单元611分布在彩色滤光层610的边缘区域。这样，仅需要在红外滤光层620的边缘上设置与红色滤光单元对应的开孔即可，降低了红外滤光层620的工艺复杂度。
该实施例中的光学指纹传感器630包括多个光学感应单元，所述彩色滤光层中的每个红色滤光单元对应于一个或多个光学感应单元，该一个或多个光学感应单元用于检测对应的红色滤光单元所透过的红光信号。
例如，在图7和图8中，每组彩色滤光单元611中的各个滤光单元分别对应不同的光学感应单元。其中，与红色滤光单元对应的光学感应单元用于检测该红色滤光单元透过的红光信号，与绿色滤光单元对应的光学感应单元用于检测该绿色滤光单元透过的绿光信号，与蓝色滤光单元对应的光学感应单元用于检测该蓝色滤光单元透过的蓝光信号。这些信号均用于判别指纹真伪和/或用于强光检测。而区域612对应的各个光学感应单元用于检测区域612透过的光信号，这些光信号用于获取指纹图像。
方式2
彩色滤光层610包括位于彩色滤光层610的边缘区域的多个红色滤光单元，该红色滤光单元用于透过手指返回的红光信号。
红外滤光层620用于阻挡其截止波长以上的红光和红外光。其中，红外滤光层620的面积小于彩色滤光层610的面积，以不阻挡透过该边缘区域的红色滤光单元的该红光信号。
光学指纹传感器630用于检测该手指返回并透过彩色滤光层610和红外滤光层620的光信号，该光信号用于获取手指的指纹图像。其中，该光信号中的透过该边缘区域的红色滤光单元的该红光信号用于强光检测。
该实施例中，红外滤光层620可以阻挡其截止波长以上的红光和红外光，避免红外光和红光对指纹检测的影响，而彩色滤光层610中的红色滤光单元用于透过红光信号，以用于强光检测。由于红外滤光层630的面积设置为小于彩色滤光层610的面积，并且彩色滤光层610的边缘区域设置有红色滤光单元。这样，红外滤光层630就不会对该边缘区域的红色滤光单元所透过的红光信号造成阻挡，从而在有效实现红外滤光层620的功能的同时，可以利用透过该红色滤光单元的红光信号进行强光检测。
以图9所示的彩色滤光层610为例，彩色滤光层610中的边缘区域设置有红色滤光单元611。图9所示的每个红色滤光单元611可以透过红光信号，由于红外滤光层620的面积小于彩色滤光层610，因此这些红光不会受到红外滤光层620的阻挡，从而使光学指纹传感器630获取到足够的红光分量，并用于强光检测。除红色滤光单元611之外的其他区域612为彩色滤光层610的基底，该基底例如可以是透明的或者绿色的。区域612透过的光信号达到指纹传感器后，可以用来获取指纹图像。这样，在利用区域612透过的光信号获取指纹图像的同时，也利用红色滤光单元透过的光信号实现了强光检测。
除了红色滤光单元，彩色滤光层610的边缘区域还可以设置其他颜色的滤光单元，例如绿色滤光单元、蓝色滤光单元等等。
彩色滤光层610的边缘区域仅存在红色滤光单元时，其透过的红光信号可以用来进行强光检测，但是基于该红光信号进行指纹防伪的效果并非最佳。为此，可以在边缘区域设置多种颜色的滤光单元以增加指纹防伪的功能。
例如图9所示，彩色滤光层610的边缘区域设置有交替排布的红色滤光单元、绿色滤光单元和蓝色滤光单元。红外滤光层620的面积小于彩色滤光 层610的面积610，以不阻挡彩色滤光层610的边缘区域透过的光信号。该边缘区域的红色滤光单元、绿色滤光单元和蓝色滤光单元分别可以透过红光信号、绿光信号和蓝光信号。由于红外滤光层620的面积小于彩色滤光层610，因此红外滤光层620不会阻挡彩色滤光层610透过的该红光信号，从而使该红光信号可以与该绿光信号和该蓝光信号一起到达光学指纹传感器，从而实现强光检测和指纹防伪。而从区域612透过的光信号达到指纹传感器后，可以用来获取指纹图像。这样，在形成指纹图像的同时，也实现了强光检测和指纹防伪。
该实施例中，彩色滤光层620的中间区域可以为基底，例如为透明基底。或者，彩色滤光层620的中间区域也可以设置有多组例如前述图7或图8中所示的彩色滤光单元611，这时，边缘区域的红色滤光单元用来进行强光检测，而该中间区域的彩色滤光单元用于指纹防伪。此时，红外滤光片620中与该红色滤光单元对应的位置上也可以不开孔，以降低红外滤光层620的工艺复杂度，但是可能牺牲一定的指纹防伪的性能。
本申请实施例对该中间区域和该边缘区域的相对大小不作限定。边缘区域位于中间区域的外侧，其中，彩色滤光层610的边缘区域对应于光学指纹传感器630中位于边缘的光学感应单元，而中间区域对应于光学指纹传感器630中位于中间的光学感应单元。具体地，边缘区域的滤光单元可以对应于光学指纹传感器边缘的至少一圈光学感应单元，例如一圈、两圈或者三圈光学感应单元。
并且，在彩色滤光层610的四周，可以设置一圈或多圈黑色滤光单元，用来吸收手指返回的光信号。该一圈或多圈黑色滤光单元可以对应于光学指纹传感器边缘的一圈或多圈光学感应单元。与黑色滤光单元对应的光学感应单元采集到的光信号为噪声信号，可以根据该噪声信号，对其他感应单元采集到的光信号进行例如噪声抵消等处理，从而降低噪声对指纹检测的影响。
可见，方式2中通过设置红外滤光层620的面积小于彩色滤光层610的面积，以不阻挡透过彩色滤光层610边缘的红色滤光单元的红光信号，从而增加了手指返回的光信号中的红光分量，增加的红光分量可以用于强光检测。
该实施例中的光学指纹传感器630包括多个光学感应单元，彩色滤光层中的每个红色滤光单元对应于一个或多个光学感应单元，该一个或多个光学感应单元用于检测对应的红色滤光单元所透过的红光信号。
例如，在图8中，彩色滤光层610的边缘区域上的各个红色滤光单元分别对应不同的光学感应单元，每个光学感应单元可以检测到其对应的红色滤光单元透过的红光信号。而中间的区域612对应的各个光学感应单元用于检测区域612透过的光信号。
本申请实施例中，指纹检测的装置600还可以包括光路引导结构。
其中，光路引导结构640包括具有多个微透镜的微透镜阵列641，以及至少一个挡光层。其中，每个挡光层上具有与该多个微透镜分别对应的多个开孔。
该微透镜用于将手指返回的光信号会聚到挡光层中对应的开孔，并通过该挡光层中对应的开孔传输至光学指纹传感器630。
可选地，在一种实现方式，上述的彩色滤光层610可以位于微透镜阵列641的下方。
可选地，在一种实现方式，当光路引导结构640包括两个挡光层时，上述的红外滤光层620可以设置于两个挡光层之间。
可选地，在一种实现方式，两个挡光层中底层的第一挡光层642与光学指纹传感器630集成在一起。例如，光学指纹传感器630中顶层的金属层可以作为该第一挡光层642，从而使第一挡光层642成为光学指纹传感器630的一部分，该金属层例如可以是光学指纹传感器630的线路连接层。
进一步地，红外滤光层620可以设置在第一挡光层642的上方。例如，第一挡光层642和红外滤光层620之间可以通过透明介质层634连接，而红外滤光层620可以通过镀膜方式形成在透明介质层634的上表面。
当光学指纹传感器630中顶层的金属层作为第一挡光层642时，透明介质层634也可以作为光学指纹传感器630的一部分覆盖在第一挡光层642的上表面，并填充第一挡光层642中的开孔。透明介质层634例如可以用作保护作用，用于保护光学指纹传感器630。
进一步地，两个挡光层中的第二挡光层643可以设置在彩色滤光层610与红外滤光层620之间。
参考图10所示的指纹检测的装置600，装置600设置在显示屏650的下方。该装置600从上至下依次包括微透镜阵列641、彩色滤光层610、第二挡光层643、红外滤光层620、第一挡光层642、以及光学指纹传感器630。彩色滤光层610包括红色滤光单元6111、绿色滤光单元6112和蓝色滤光单 元6113，这里假设红色滤光单元6111、绿色滤光单元6112和蓝色滤光单元6113之间不存在间距。红外滤光层620上与红色滤光单元6111对应的位置上设置有开孔B。微透镜阵列641包括多个微透镜，例如微透镜6411至微透镜6413。光学指纹传感器630包括多个光学感应单元，例如光学感应单元631至光学感应单元633。
手指返回的光信号经过微透镜6411后，到达彩色滤光层610中的红色滤光单元6111，红色滤光单元6111对其进行滤光后得到红光信号。该红光信号依次经过第二挡光层643上的开孔A、红外滤光层620中的开孔B、以及第一挡光层642上的开孔C，最终到达光学感应单元上631；类似地，经过微透镜6412会聚的光信号到达彩色滤光层610中的绿色滤光单元6112后得到绿光信号，该绿光信号依次经过第二挡光层643上对应的开孔、红外滤光层620、以及第一挡光层642上对应的开孔，到达光学感应单元632；经过微透镜6413会聚的光信号到达彩色滤光层610中的蓝色滤光单元6113后得到蓝光信号，该蓝光信号依次经过第二挡光层643上对应的开孔、红外滤光层620、以及第一挡光层642上对应的开孔，到达光学感应单元633。
由于红外滤光层620仅对红光和红外光进行阻挡，不对蓝光和绿光进行阻挡。因此，在红外滤光层620中，可以仅在与红色滤光单元6111对应的位置上设置有开孔。当然，如果在红外滤光层620中与绿色滤光单元6112和蓝色滤光单元6113对应的位置上也设置开孔，也并非不可以。
光学感应单元631、光学感应单元632和光学感应单元633采集到的光信号中的红色分量用于指纹防伪和/或强光检测。可以基于指纹防伪，对该指纹图像是否来自活体手指进行判别。并且，基于强光检测的结果，可以对指纹图像进行修正，从而在强光环境下也能够获得准确的指纹图像。
可选地，在图10中，第二挡光层643中的开孔A、红外滤光层中的开孔B、以及第一挡光层642中的开孔C的孔径可以设置为由上至下依次减小。这样就能够将一定的角度范围内的光信号引导至相应的光学感应单元。
图10中所示的手指接触显示屏350的上表面时，形成手指部分覆盖的区域和手指全部覆盖的区域。对于手指全部覆盖的区域，通常光学指纹传感器630能够获得的光信号的强度较小，因此不适合用作强光检测。而在本申请实施例中，由于红外滤光层620不会阻挡彩色滤光层610中红色滤光单元透过的光信号，因此与该红色滤光单元对应的光学感应单元能够获得足够的 红光信号，手指全部覆盖的区域返回的光信号也可以用来进行强光检测。对于手指部分覆盖的区域，光学指纹传感器630能够较多的强光分量，因此可以协助判断手指的按压位置，方便后续执行指纹算法。
图10示出了利用倾斜光路进行指纹检测的光路。但本申请实施例还可以采用垂直光路进行指纹检测，例如图11所示。图11中各个结构的细节可以参考上述图11中的描述，为了简洁，这里不再赘述。
本申请实施例还提供了一种电子设备，该电子设备包括上述本申请各种实施例中的指纹检测的装置600。
该电子设备还可以包括显示屏，例如可以是普通的非折叠显示屏，也可以为可折叠显示屏或称为柔性显示屏。
作为示例而非限定，本申请实施例中的电子设备可以为终端设备、手机、平板电脑、笔记本电脑、台式机电脑、游戏设备、车载电子设备或穿戴式智能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。该穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或部分功能的设备，例如智能手表或智能眼镜等，以及包括只专注于某一类应用功能并且需要和其它设备如智能手机配合使用的设备，例如各类进行体征监测的智能手环、智能首饰等设备。
需要说明的是，在不冲突的前提下，本申请描述的各个实施例和/或各个实施例中的技术特征可以任意的相互组合，组合之后得到的技术方案也应落入本申请的保护范围。
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，本领域技术人员可以在上述实施例的基础上进行各种改进和变形，而这些改进或者变形均落在本申请的保护范围内。
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。

Claims (28)

  1. 一种指纹检测的装置，其特征在于，设置于电子设备的显示屏下方，以用于屏下指纹检测，所述装置包括：
    彩色滤光层，包括多组彩色滤光单元，其中每组彩色滤光单元包括红色滤光单元，所述红色滤光单元用于透过手指返回的红光信号；
    红外滤光层，用于阻挡其截止波长以上的红光和红外光，其中，所述红外滤光层中与所述红色滤光单元对应的位置上设置有开孔，以不阻挡透过所述红色滤光单元的所述红光信号；
    光学指纹传感器，用于检测所述手指返回并透过所述彩色滤光层和所述红外滤光层的光信号，所述光信号用于获取所述手指的指纹图像，其中，所述光信号中的所述红光信号用于确定所述手指的真伪和/或用于强光检测。
  2. 根据权利要求1所述的装置，其特征在于，所述每组彩色滤光单元还包括绿色滤光单元和/或蓝色滤光单元。
  3. 根据权利要求1或2所述的装置，其特征在于，所述多组彩色滤光单元在所述彩色滤光层上阵列式分布。
  4. 根据权利要求1至3中任一项所述的装置，其特征在于，所述多组彩色单元中位于所述彩色滤光层的边缘区域的红色滤光单元透过的红光信号用于确定所述手指的真伪，位于所述彩色滤光层的中间区域的红色滤光单元透过的红光信号用于强光检测。
  5. 根据权利要求4所述的装置，其特征在于，所述红外滤光层中与所述边缘区域的红色滤光单元对应的位置上设置有开孔，与所述中间区域的红色滤光单元对应的位置上设置有开孔或者不设置开孔。
  6. 根据权利要求1或2所述的装置，其特征在于，所述多组彩色滤光单元分布于所述彩色滤光层的边缘区域。
  7. 根据权利要求6所述的装置，其特征在于，所述边缘区域的滤光单元可以对应于所述光学指纹传感器边缘的至少一圈光学感应单元。
  8. 根据权利要求1至7中任一项所述的装置，其特征在于，所述光学指纹传感器包括多个光学感应单元，所述彩色滤光层中的每个红色滤光单元对应于一个或多个光学感应单元，所述一个或多个光学感应单元用于检测透过对应的红色滤光单元的红光信号。
  9. 根据权利要求1至8中任一项所述的装置，其特征在于，还包括光 路引导结构，所述光路引导结构包括：
    微透镜阵列，包括多个微透镜；
    至少一个挡光层，其中每个挡光层上具有与所述多个微透镜分别对应的多个开孔；
    其中，所述微透镜用于将所述手指返回的光信号会聚到所述挡光层中对应的开孔，并通过所述挡光层中对应的开孔传输至所述光学指纹传感器。
  10. 根据权利要求9所述的装置，其特征在于，所述彩色滤光层位于所述微透镜阵列的下方，所述红外滤光层设置于两个挡光层之间。
  11. 根据权利要求10所述的装置，其特征在于，所述至少一个挡光层中的第一挡光层与所述光学指纹传感器集成在一起，所述红外滤光层设置在所述第一挡光层的上方。
  12. 根据权利要求11所述的装置，其特征在于，所述第一挡光层与所述红外滤光层之间通过透明介质层连接，所述红外滤光层通过镀膜方式形成在所述透明介质层的上表面。
  13. 根据权利要求9至12中任一项所述的装置，其特征在于，所述至少一个挡光层中的第二挡光层位于所述彩色滤光层与所述红外滤光层之间。
  14. 根据权利要求13所述的装置，其特征在于，所述第二挡光层中的开孔、所述红外滤光层中的开孔、以及所述第一挡光层中的开孔的孔径由上至下依次减小。
  15. 根据权利要求1至14中任一项所述的装置，其特征在于，所述手指返回的光信号为垂直光信号或者倾斜光信号。
  16. 一种指纹检测的装置，其特征在于，设置于电子设备的显示屏下方，以用于屏下指纹检测，所述装置包括：
    彩色滤光层，包括位于所述彩色滤光层的边缘区域的多个红色滤光单元，所述红色滤光单元用于透过手指返回的红光信号；
    红外滤光层，用于阻挡其截止波长以上的红光和红外光，其中，所述红外滤光层的面积小于所述彩色滤光层的面积，以不阻挡透过所述边缘区域的红色滤光单元的所述红光信号；
    光学指纹传感器，用于检测所述手指返回的并透过所述彩色滤光层和所述红外滤光层的光信号，所述光信号用于获取所述手指的指纹图像，其中，所述光信号中的透过所述边缘区域的红色滤光单元的所述红光信号用于强 光检测。
  17. 根据权利要求16所述的装置，其特征在于，所述彩色滤光层还包括位于所述彩色滤光层的中间区域的多组彩色滤光单元，其中每组彩色滤光单元包括红色滤光单元，所述红色滤光单元用于透过手指返回的红光信号。
  18. 根据权利要求17所述的装置，其特征在于，所述每组彩色滤光单元还包括蓝色滤光单元和/或绿色滤光单元。
  19. 根据权利要求17或18所述的装置，其特征在于，所述红外滤光层中与所述中间区域的红色滤光单元对应的位置上设置有开孔，所述红外滤光层中的开孔用于透过所述红光信号，所述光信号中的透过所述中间区域的红色滤光单元的所述红光信号用于指纹防伪。
  20. 根据权利要求16至19中任一项所述的装置，其特征在于，所述指纹传感器包括多个光学感应单元，所述彩色滤光层中的每个红色滤光单元对应于一个或多个光学感应单元，所述一个或多个光学感应单元用于检测透过对应的红色滤光单元的红光信号。
  21. 根据权利要求16至20中任一项所述的装置，其特征在于，还包括光路引导结构，所述光路引导结构包括：
    微透镜阵列，包括多个微透镜；
    至少一个挡光层，其中每个挡光层上具有与所述多个微透镜分别对应的多个开孔；
    其中，所述微透镜用于将所述手指返回的光信号会聚到所述挡光层中对应的开孔，并通过所述挡光层中对应的开孔传输至所述光学指纹传感器。
  22. 根据权利要求21所述的装置，其特征在于，所述彩色滤光层位于所述微透镜阵列的下方，所述红外滤光层设置于两个挡光层之间。
  23. 根据权利要求22所述的装置，其特征在于，所述至少一个挡光层中的第一挡光层与所述光学指纹传感器集成在一起，所述红外滤光层设置在所述第一挡光层的上方。
  24. 根据权利要求23所述的装置，其特征在于，所述第一挡光层与所述红外滤光层之间通过透明介质层连接，所述红外滤光层通过镀膜方式形成在所述透明介质层的上表面。
  25. 根据权利要求21至24中任一项所述的装置，其特征在于，所述至少一个挡光层中的第二挡光层位于所述彩色滤光层与所述红外滤光层之间。
  26. 根据权利要求25所述的装置，其特征在于，所述第二挡光层中的开孔、红外滤光层中的开孔、以及所述第一挡光层中的开孔的孔径由上至下依次减小。
  27. 根据权利要求16至26中任一项所述的装置，其特征在于，所述手指返回的光信号为垂直光信号或者倾斜光信号。
  28. 一种电子设备，其特征在于，包括根据权利要求1至27中任一项所述的指纹检测的装置。
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