WO2021035599A1 - 指纹识别的装置、方法和电子设备 - Google Patents

指纹识别的装置、方法和电子设备 Download PDF

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Publication number
WO2021035599A1
WO2021035599A1 PCT/CN2019/103202 CN2019103202W WO2021035599A1 WO 2021035599 A1 WO2021035599 A1 WO 2021035599A1 CN 2019103202 W CN2019103202 W CN 2019103202W WO 2021035599 A1 WO2021035599 A1 WO 2021035599A1
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WO
WIPO (PCT)
Prior art keywords
light signal
finger
oblique
light
photosensitive area
Prior art date
Application number
PCT/CN2019/103202
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English (en)
French (fr)
Inventor
杜灿鸿
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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Publication date
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 CN201980004077.7A priority Critical patent/CN111095275B/zh
Priority to PCT/CN2019/103202 priority patent/WO2021035599A1/zh
Priority to CN202020066554.2U priority patent/CN211529172U/zh
Priority to KR1020207029218A priority patent/KR102462669B1/ko
Priority to CN202080001560.2A priority patent/CN111801688B/zh
Priority to CN202021792452.5U priority patent/CN213069852U/zh
Priority to EP20803435.5A priority patent/EP3800579B1/en
Priority to PCT/CN2020/071511 priority patent/WO2021022789A1/zh
Priority to US17/033,761 priority patent/US11176348B2/en
Publication of WO2021035599A1 publication Critical patent/WO2021035599A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14678—Contact-type imagers
    • 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
    • G06V40/1382—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/1462—Coatings
    • H01L27/14623—Optical shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/14625—Optical elements or arrangements associated with the device
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors

Definitions

  • the embodiments of the present application relate to the field of fingerprint identification, and more specifically, to a fingerprint identification device, method, and electronic equipment.
  • the fingerprint recognition technology under the optical screen is to collect the light signal formed by the reflection or transmission of light on the finger.
  • the light signal carries the fingerprint information of the finger, so as to realize the fingerprint recognition under the screen.
  • the plane fake fingerprint data forged through user fingerprint photos (for example, printed or electronic), etc. can deceive the fingerprint identification system, making the security of the fingerprint identification application worse. Therefore, how to identify true and false fingerprints to improve the security of fingerprint recognition is an urgent problem to be solved.
  • the embodiments of the present application provide a fingerprint recognition device, method, and electronic equipment, which can recognize a plane fake fingerprint, thereby improving the security of fingerprint recognition.
  • a fingerprint recognition device which is suitable for under the display screen to realize under-screen optical fingerprint recognition, the device includes a fingerprint sensor, and the fingerprint sensor includes:
  • At least one first photosensitive area where the first photosensitive area is used to receive a first oblique light signal returned from a finger above the display screen;
  • At least one second photosensitive area the second photosensitive area being used to receive a second oblique light signal returned from the finger above the display screen;
  • the incident direction of the first oblique optical signal is perpendicular to the first polarization direction
  • the incident direction of the second oblique optical signal is parallel to the first polarization direction
  • the first polarization direction is set to the finger
  • the polarization direction output by the linear polarization unit on the optical path between the fingerprint sensor and the fingerprint sensor, and the light intensity difference between the first oblique light signal and the second oblique light signal is used to identify the authenticity of the finger.
  • the first oblique optical signal is an optical signal that is returned after the finger is illuminated by an optical signal dominated by s-waves
  • the second oblique optical signal is an optical signal dominated by p-waves. The light signal returned after the signal irradiates the finger.
  • the light intensity difference and/or ratio between the first oblique light signal and the second oblique light signal is used to identify the authenticity of the finger.
  • the difference between the light intensity of the first oblique light signal and the light intensity of the second oblique light signal belongs to the first range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the ratio of the light intensity of the first oblique light signal to the light intensity of the second oblique light signal belongs to the second range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the intensities of the first oblique light signal and the second oblique light signal include the intensity of diffuse reflection light from the finger, and the intensity of the light from the finger on the display screen. The intensity of the reflected light at the contact interface.
  • the first oblique light signal is also used to obtain a fingerprint image of the finger, and/or the second oblique light signal is also used to obtain a fingerprint image of the finger.
  • the first tilt light signal and the second tilt light signal have the same tilt angle with respect to the fingerprint sensor.
  • the fingerprint sensor further includes:
  • the third photosensitive area is used to receive the vertical light signal returned from the finger above the display screen, the vertical light signal is used to obtain the fingerprint image of the finger, and the incident direction of the vertical light signal is perpendicular to the vertical light signal. ⁇ Fingerprint sensor.
  • the first photosensitive area and the second photosensitive area are respectively located on two upper sides of one side of the third photosensitive area.
  • the first photosensitive area and the second photosensitive area are respectively located on two sides above the first side and the second side of the third photosensitive area, and the first side is The opposite side of the second side, and the first photosensitive area and the second photosensitive area are alternately distributed around the third photosensitive area.
  • the area of the first photosensitive area and the second photosensitive area are the same, and the area of the first photosensitive area and the second photosensitive area is smaller than that of the third photosensitive area. area.
  • the areas of the first photosensitive region, the second photosensitive region, and the third photosensitive region are the same.
  • the device further includes a light path guiding structure, wherein the light path guiding structure is used to transmit the first oblique light signal to at least one first pixel in the first photosensitive area Unit, transmitting the second oblique light signal to at least one second pixel unit in the second photosensitive area, and transmitting the vertical light signal to at least one third pixel unit in the third photosensitive area.
  • the light path guiding structure is used to transmit the first oblique light signal to at least one first pixel in the first photosensitive area Unit, transmitting the second oblique light signal to at least one second pixel unit in the second photosensitive area, and transmitting the vertical light signal to at least one third pixel unit in the third photosensitive area.
  • the optical path guiding structure includes:
  • the first microlens array includes at least one first microlens unit for converging the first oblique light signal, and the first microlens unit corresponds to the first pixel unit in a one-to-one correspondence;
  • the second microlens array includes at least one second microlens unit for condensing the second oblique light signal, and the second microlens unit corresponds to the second pixel unit in a one-to-one correspondence;
  • the third microlens array includes at least one third microlens unit for condensing the vertical optical signal, and the third microlens unit corresponds to the third pixel unit one-to-one;
  • At least one light blocking layer is arranged under the first microlens array, the second microlens array and the third microlens array, wherein,
  • Each light blocking layer includes at least one first opening corresponding to the at least one first microlens unit, and the first oblique light signal condensed by each first microlens unit passes through different light blocking layers The first opening corresponding to each of the first microlens units reaches the first pixel unit corresponding to each of the first microlens units;
  • Each light blocking layer includes at least one second opening corresponding to the at least one second microlens unit, and the second oblique light signal condensed by each second microlens unit passes through different light blocking layers The second opening corresponding to each of the second microlens units reaches the second pixel unit corresponding to each of the second microlens units;
  • Each light-blocking layer includes at least one third opening corresponding to the at least one third microlens unit, and the vertical light signal condensed by each third microlens unit passes through different light-blocking layers and The third opening corresponding to each third microlens unit reaches the third pixel unit corresponding to each third microlens unit.
  • the first microlens array is separated from the third microlens array by a first distance, and/or the second microlens array is separated from the third microlens array The first distance therebetween.
  • adjacent light-blocking layers are spaced at the same distance in the vertical direction; first openings in adjacent light-blocking layers corresponding to the same first microlens unit are spaced apart from each other in the horizontal direction.
  • Two distances to transmit the first oblique light signal to the at least one first pixel unit, and/or, the second openings in adjacent light blocking layers corresponding to the same second microlens unit are horizontally The second distance is spaced in the direction to transmit the second oblique light signal to the at least one second pixel unit.
  • the apertures of the openings in different light blocking layers corresponding to the same microlens unit are sequentially reduced from top to bottom.
  • the display screen is an organic light-emitting diode (Organic Light-Emitting Diode, OLED) display screen
  • the first oblique light signal and the second oblique light signal are the OLED display screen
  • the light signal emitted by the light-emitting layer is the light signal returned by the finger.
  • a fingerprint recognition method which is suitable for under the display screen to realize the under-screen optical fingerprint recognition, and the method includes:
  • the first oblique light signal returned from the finger above the display screen is received through at least one first photosensitive area of the fingerprint sensor, and the first oblique light signal returned from the finger above the display screen is received through at least one second photosensitive area of the fingerprint sensor.
  • the second oblique optical signal returned by the finger wherein the incident direction of the first oblique optical signal is perpendicular to the first polarization direction, the incident direction of the second oblique optical signal is parallel to the first polarization direction, and the second oblique optical signal is parallel to the first polarization direction.
  • a polarization direction is the polarization direction output by the linear polarization unit arranged on the optical path between the finger and the fingerprint sensor;
  • the authenticity of the finger is identified according to the light intensity difference between the first oblique light signal and the second oblique light signal.
  • the first oblique optical signal is an optical signal that is returned after the finger is illuminated by an optical signal dominated by s-waves
  • the second oblique optical signal is an optical signal dominated by p-waves. The light signal returned after the signal irradiates the finger.
  • the identifying the authenticity of the finger according to the light intensity difference between the first oblique light signal and the second oblique light signal includes:
  • the light intensity ratio identifies the true and false of the finger.
  • the identifying the authenticity of the finger according to the light intensity difference between the first oblique light signal and the second oblique light signal includes:
  • the difference between the light intensity of the first oblique light signal and the light intensity of the second oblique light signal belongs to the first range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the identifying the true or false of the finger according to the light intensity ratio of the first oblique light signal and the second oblique light signal includes:
  • the ratio of the light intensity of the first oblique light signal to the light intensity of the second oblique light signal belongs to the second range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the intensities of the first oblique light signal and the second oblique light signal include the intensity of diffuse reflection light from the finger, and the intensity of the light from the finger on the display screen. The intensity of the reflected light at the contact interface.
  • the method further includes:
  • the fingerprint image of the finger is acquired according to the first oblique light signal, and/or the fingerprint image of the finger is acquired according to the second oblique light signal.
  • the first tilt light signal and the second tilt light signal have the same tilt angle with respect to the fingerprint sensor.
  • the method further includes:
  • the first photosensitive area and the second photosensitive area are respectively located on two upper sides of one side of the third photosensitive area.
  • the first photosensitive area and the second photosensitive area are respectively located on two sides above the first side and the second side of the third photosensitive area, and the first side is The opposite side of the second side, and the first photosensitive area and the second photosensitive area are alternately distributed around the third photosensitive area.
  • the area of the first photosensitive area and the second photosensitive area are the same, and the area of the first photosensitive area and the second photosensitive area is smaller than that of the third photosensitive area. area.
  • the areas of the first photosensitive region, the second photosensitive region, and the third photosensitive region are the same.
  • the display screen is an OLED display screen
  • the first oblique light signal and the second oblique light signal are the light signals emitted by the light-emitting layer of the OLED display screen and return via the finger.
  • Light signal is an OLED display screen
  • an electronic device including:
  • the fingerprint recognition device, the display screen and the processor in the first aspect or any possible implementation of the first aspect;
  • At least one first photosensitive area of the fingerprint sensor is used to receive a first oblique light signal returned from a finger above the display screen
  • at least one second photosensitive area of the fingerprint sensor is used to receive a signal from the display
  • the incident direction of the first oblique optical signal is perpendicular to the first polarization direction
  • the incident direction of the second oblique optical signal is parallel to the first polarization direction
  • the first polarization direction is the polarization direction output by the linear polarization unit disposed on the optical path between the finger and the fingerprint sensor
  • the processor is configured to respond to the first oblique light signal and the second oblique light signal.
  • the difference in light intensity of the light signal identifies the authenticity of the finger.
  • the processor is configured to:
  • the authenticity of the finger is identified according to the light intensity difference and/or ratio between the first oblique light signal and the second oblique light signal.
  • the processor is specifically configured to:
  • the difference between the light intensity of the first oblique light signal and the light intensity of the second oblique light signal belongs to the first range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the processor is specifically configured to:
  • the ratio of the light intensity of the first oblique light signal to the light intensity of the second oblique light signal belongs to the second range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the display screen is an OLED display screen
  • the first oblique light signal and the second oblique light signal are the light signals emitted by the light-emitting layer of the OLED display screen and return via the finger.
  • Light signal is an OLED display screen
  • a computer-readable medium for storing a computer program, and the computer program includes instructions for executing the above-mentioned second aspect and any possible implementation manner thereof.
  • a computer program product including instructions is provided.
  • the computer runs the finger of the computer program product, the computer executes the fingerprint recognition in the second aspect and any one of its possible implementations. method.
  • the computer program product can be run on the electronic device of the third aspect described above.
  • At least one first photosensitive area in the fingerprint sensor receives the first oblique light signal returned from the finger above the display screen
  • at least one second photosensitive area in the fingerprint sensor receives the first oblique light signal returned from the finger above the display screen.
  • the second oblique light signal is used to identify the true or false of the finger based on the light intensity difference between the first oblique light signal and the second oblique light signal, thereby being able to identify a plane fake fingerprint, thereby improving the security of fingerprint recognition.
  • FIG. 1A and FIG. 2A are schematic diagrams of the structure of an electronic device to which the present application can be applied.
  • Figures 1B and 2B are schematic cross-sectional views of the electronic device shown in Figures 1A and 2A along the A-A' direction, respectively.
  • Fig. 3 is a schematic block diagram of a fingerprint identification device according to an embodiment of the present application.
  • Fig. 4 is a schematic structural diagram of a fingerprint identification device according to an embodiment of the present application.
  • Fig. 5 is a graph showing the variation of s-wave and p-wave with the angle of refraction ⁇ provided by an embodiment of the application.
  • FIG. 6 is a schematic diagram of the light intensity of the reflected light in the process of real finger recognition provided by an embodiment of the present application.
  • FIG. 7 is a schematic diagram of the light intensity of the reflected light in the process of identifying a flat fake finger according to an embodiment of the present application.
  • FIG. 8 is a graph showing the variation of p real and p fake with A 1 /A 0 provided by an embodiment of the present application.
  • FIG. 9 is another schematic structural diagram of a fingerprint recognition device according to an embodiment of the present application.
  • FIG. 10 is still another schematic structural diagram of the fingerprint identification device according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a fingerprint recognition device based on an optical path guide structure according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of a fingerprint recognition device based on an optical path guide structure according to an embodiment of the present application.
  • FIG. 13 is another schematic structural diagram of a fingerprint recognition device based on an optical path guide structure according to an embodiment of the present application.
  • FIG. 14 is a schematic flowchart of a fingerprint identification method according to an embodiment of the present application.
  • FIG. 15 is a schematic block diagram of an electronic device according to an embodiment of the present application.
  • 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, and other mobile terminals with display screens or other electronic devices; more specifically, in the above-mentioned electronic devices, the fingerprint model The group may specifically be an optical fingerprint module or a fingerprint recognition device, which may be arranged in a partial area or an entire area below the display screen to form an under-display (under-screen) optical fingerprint system.
  • the optical fingerprint module may also be partially or fully integrated into the display screen of the electronic device, thereby forming an in-display or in-screen optical fingerprint system.
  • the fingerprint recognition technology under the optical screen uses the light returned from the top surface of the device display component to perform fingerprint sensing and other sensing operations.
  • the returned light carries information about the object (for example, a finger) in contact with the top surface.
  • a specific optical sensor module located under the display screen is realized.
  • the design of the optical sensor module can be to achieve desired optical imaging by appropriately configuring optical elements for collecting and detecting the returned light.
  • FIGS. 1A and 2A show schematic structural diagrams of electronic devices to which the embodiments of the present application can be applied.
  • FIGS. 1B and 2B are schematic cross-sectional views of the electronic device shown in FIGS. 1A and 2A along the A-A' direction, 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 (also referred to as pixels, photosensitive pixels, pixel units, etc.).
  • the area where the sensing array 133 is located or its sensing area is the fingerprint detection area 103 of the optical fingerprint module 130 (also referred to as a fingerprint collection area, a fingerprint recognition area, etc.).
  • the fingerprint detection area 103 is located in the display area of the display screen 120.
  • FIG. 1A the fingerprint detection area 103 is located in the display area of the display screen 120.
  • the optical fingerprint module 130 may also be arranged in other positions, such as the side of the display screen 120 or the non-transmissive area at the edge of the electronic device 10, and the optical fingerprint module 130 The optical signal of at least a part of the display area of the display screen 120 is guided to the optical fingerprint module 130, so that the fingerprint detection area 103 is actually located in the display area of the display screen 120.
  • the area of the fingerprint detection area 103 may be different from the area of the sensing array 133 of the optical fingerprint module 130, for example, through an optical path design such as lens imaging, a reflective folding optical path design, or other optical paths such as light convergence or reflection.
  • the design can make the area of the fingerprint detection area 103 of the optical fingerprint module 130 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 may also be designed to be substantially the same as the area of the sensing array of the optical fingerprint module 130.
  • the electronic device 10 adopting the above structure does not need to reserve space on the front side to set a 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 It can be basically extended to the front of the entire electronic device 10.
  • a fingerprint button such as the Home button
  • the optical fingerprint module 130 includes a light detecting part 134 and an optical component 132.
  • the light detection part 134 includes the sensor array 133, a reading circuit electrically connected to the sensor array 133, and other auxiliary circuits, which can be fabricated on a chip (Die) by a semiconductor process, such as an optical imaging chip Or an optical fingerprint sensor.
  • the sensing array 133 is specifically a photodetector (photodetector) array, which includes a plurality of photodetectors distributed in an array, and the photodetectors can be used as the optical sensing unit as described above.
  • the optical component 132 may be arranged above the sensing array 133 of the light detection part 134, and it may specifically include a filter layer (Filter), a light guide layer (also called a light path guide structure), and other optical elements.
  • the filter layer can be used to filter out the ambient light penetrating the finger, and the light guide layer is mainly used to guide the reflected light reflected from the surface of the finger to the sensor array 133 for optical detection.
  • the optical assembly 132 and the light detecting part 134 may be packaged in the same optical fingerprint component.
  • the optical component 132 and the optical detection part 134 can be packaged in the same optical fingerprint chip, or the optical component 132 can be arranged outside the chip where the optical detection part 134 is located, for example, the optical component 132 is attached above 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 a variety of implementation schemes.
  • the light guide layer may be specifically a collimator layer made on a semiconductor silicon wafer, which has a plurality of collimator units.
  • the collimating unit can be specifically a small hole.
  • the reflected light reflected from the finger the light that is perpendicularly incident on the collimating unit can pass through and be received by the optical sensing unit below it, and then enter The light with an excessively large angle is attenuated by multiple reflections inside the collimating unit. Therefore, each optical sensing unit can basically only receive the reflected light reflected by the fingerprint pattern directly above it, so the sensing array 133 is convenient.
  • the fingerprint image of the finger can be detected.
  • 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 converges to the sensing array 133 of the light detection 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.
  • the optical lens layer may further have a pinhole 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 is described.
  • 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-lens, which may be obtained through a semiconductor growth process or other processes. It is formed above the sensing array 133 of the light detecting part 134, and each microlens may correspond to one of the sensing units of the sensing array 133, respectively.
  • other optical film layers may be formed between the micro lens layer and the sensing unit, such as a dielectric layer or a passivation layer.
  • a light blocking layer (or called a light blocking layer, a light blocking layer, etc.) with micro holes (or called openings) may also be included between the micro lens layer and the sensing unit, wherein the micro lens layer and the sensing unit may also include a light blocking layer (also called a light blocking layer, a light blocking layer, etc.).
  • the hole is 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 through the micro lens To the inside of the micropore and transfer to the sensing unit through the micropore to perform optical fingerprint imaging.
  • 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, its 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 (Organic Light-Emitting Diode, OLED) display 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 display unit (ie, an OLED light source) of the OLED display screen 120 located 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 target finger 140 above the fingerprint detection area 103.
  • the light 111 is reflected on the surface of the finger 140 to form reflected light or pass through all the fingers.
  • the finger 140 scatters inside to form scattered light.
  • the above-mentioned reflected light and scattered light are collectively referred to as reflected light. Because the ridge 141 and valley 142 of the fingerprint have different light reflection capabilities, the reflected light 151 from the fingerprint ridge and the reflected light 152 from the fingerprint valley have different light intensities, and the reflected light passes through the optical component 132.
  • the electronic device 10 realizes the optical fingerprint recognition function.
  • the optical fingerprint module 130 may also use a built-in light source or an external light source to provide an optical signal for fingerprint detection.
  • the optical fingerprint module 130 may be suitable for non-self-luminous display screens, such as liquid crystal display screens or other passively-luminous display screens.
  • the optical fingerprint system of the electronic device 10 may also include an excitation light source for optical fingerprint detection.
  • the excitation light source may specifically be an infrared light source or a light source of non-visible light of a specific wavelength, which may 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 The optical fingerprint module 130 can be arranged under the edge area of the liquid crystal panel or 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 in all areas. Below the backlight module, and the backlight module is designed 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 also include a transparent protective cover plate, the cover plate 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.
  • the electronic device 10 may further include a circuit board 150 which is arranged under the optical fingerprint module 130.
  • the optical fingerprint module 130 can be adhered to the circuit board 150 through adhesive, and is electrically connected to the circuit board 150 through soldering 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 the circuit board 150.
  • the optical fingerprint module 130 can receive the control signal of the processing unit of the terminal device 10 through the circuit board 150, and can also output the fingerprint detection signal from the optical fingerprint module 130 to the processing unit or control unit of the terminal device 10 through the circuit board 150. Unit etc.
  • 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 input fingerprints. Press the finger 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 specifically include a plurality of optical fingerprint sensors. The multiple optical fingerprint sensors may 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, 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 multiple optical fingerprint sensors may be arranged side by side in the Below the display screen 120 and the sensing areas of the multiple optical fingerprint sensors collectively constitute the fingerprint detection area 103 of the optical fingerprint device 130.
  • each light guide layer corresponds to an optical fingerprint sensor, and is attached separately Set above the corresponding optical fingerprint sensor.
  • the plurality of 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 plurality of 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 on the display
  • the screen 120 and the light guide layer are mainly used to isolate the influence of external interference light on the 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 specific to each The optical fingerprint sensors are separately arranged to filter out interference light, or a large-area filter can also be used to cover the multiple optical fingerprint sensors at the same time.
  • the optical path modulator may also be replaced by an optical lens (Lens), and a small hole formed by a light-shielding material above the optical lens can cooperate with the optical lens to converge fingerprint detection light to an optical fingerprint sensor below to realize fingerprint imaging.
  • each optical fingerprint sensor may be separately configured with an optical lens to perform fingerprint imaging, or the multiple optical fingerprint sensors may 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 are configured to cooperate with the two at the same time. Or multiple sensing arrays perform optical imaging, thereby reducing the imaging distance and enhancing the imaging effect.
  • the number, size, and arrangement of the fingerprint sensors shown above are only examples, and can be adjusted according to actual needs.
  • the number of the plurality of fingerprint sensors may be 2, 3, 4, or 5, etc., and the plurality of fingerprint sensors may be distributed in a square or circular shape.
  • the embodiments of the present application can be applied to the recognition of plane fake fingerprints, and can be particularly suitable for the recognition of plane fake fingerprints printed on paper or electronic.
  • the current fingerprint recognition solution using vertical light has a poor recognition effect on planar fake fingerprints, and the fingerprint recognition solution provided by the embodiment of the present application can recognize planar fake fingerprints, thereby improving the security of fingerprint recognition.
  • FIG. 3 shows a schematic diagram of a fingerprint identification device 300 according to an embodiment of the present application.
  • the device 300 includes a fingerprint sensor 310.
  • the fingerprint sensor 310 includes at least one first photosensitive area 311 and at least one second photosensitive area 312, wherein the first photosensitive area 311 is used to receive a finger from above the display screen.
  • the returned first oblique light signal 11; the second photosensitive area 312 is used to receive the second oblique light signal 12 returned from the finger above the display screen.
  • the incident direction of the first oblique optical signal 11 is perpendicular to the first polarization direction 20
  • the incident direction of the second oblique optical signal 12 is parallel to the first polarization direction 20
  • the first polarization direction 20 is The polarization direction output by the linear polarization unit arranged on the optical path between the finger and the fingerprint sensor 310, and the light intensity difference between the first oblique light signal 11 and the second oblique light signal 12 is used to identify the State the true and false of the finger.
  • the incident direction of the first oblique optical signal 11 is perpendicular or approximately perpendicular to the first polarization direction 20, and the incident direction of the second oblique optical signal 12 is parallel or approximately parallel to the first polarization direction.
  • One polarization direction 20 That is to say, the incident direction of the first oblique optical signal 11 and the first polarization direction 20 may not be absolutely perpendicular, and the incident direction of the second oblique optical signal 12 and the first polarization direction 20 may not be absolutely perpendicular.
  • absolutely parallel the incident direction of the first oblique optical signal 11 and the first polarization direction 20.
  • the display screen is an OLED display screen
  • the first oblique optical signal 11 and the second oblique optical signal 12 are optical signals emitted by the light-emitting layer of the OLED display screen and returned by the finger.
  • the linear polarization unit may be integrated inside the display screen so as to be a part of the display screen, for example, as a part of an OLED display screen, located above the light-emitting layer of the OLED display screen.
  • the first polarization direction 20 can also be understood as the polarization direction of light emitted by the OLED display screen.
  • the first oblique optical signal 11 is an optical signal that is returned after the finger is illuminated by an optical signal dominated by s-waves
  • the second oblique optical signal 12 is an optical signal that is illuminated by an optical signal dominated by p-waves. Describe the light signal returned after the finger.
  • vibration direction of incident light is parallel to the incident surface, which is called p-wave; the vibration direction of incident light is perpendicular to the incident surface, which is called s-wave.
  • the light intensity difference between the first oblique light signal 11 and the second oblique light signal 12 may be the sum of the light intensity difference between the first oblique light signal 11 and the second oblique light signal 12 /Or the light intensity ratio of the first oblique light signal 11 to the second oblique light signal 12.
  • the finger is identified as a real finger; or, if the first The difference between the light intensity of the oblique light signal 11 and the light intensity of the second oblique light signal 12 does not belong to the first range, and the finger is identified as a fake finger.
  • the first range is a range of the difference between the light intensity of the first oblique light signal 11 and the light intensity of the second oblique light signal 12 obtained based on extensive training of real fingers.
  • the finger is identified as a real finger; or, if the first The ratio of the light intensity of the oblique light signal 11 to the light intensity of the second oblique light signal 12 does not belong to the second range, and the finger is identified as a fake finger.
  • the second range is a range of the ratio of the light intensity of the first oblique light signal 11 to the light intensity of the second oblique light signal 12 obtained based on extensive training of real fingers.
  • the intensities of the first oblique light signal 11 and the second oblique light signal 12 include the intensity of diffuse reflection light from the finger, and the intensity of the light from the touch interface of the finger on the display screen. The intensity of the reflected light.
  • the intensity of the diffuse reflection light from the finger may include the intensity of the diffuse reflection light from the valley line of the fingerprint road and the ridge line of the fingerprint road.
  • the first oblique light signal 11 is also used to obtain a fingerprint image of the finger
  • the second oblique light signal 12 is also used to obtain a fingerprint image of the finger. That is, the first oblique light signal 11 and the second oblique light signal 12 can not only identify real and fake fingers, but also collect fingerprint images.
  • the first photosensitive area 311 is sufficiently large
  • the first oblique light signal 11 is also used to obtain a fingerprint image of the finger.
  • the second photosensitive area 312 is sufficiently large
  • the second oblique light signal 12 is also used to obtain a fingerprint image of the finger.
  • the first oblique light signal 11 and the second oblique light signal 12 may have the same inclination angle with respect to the fingerprint sensor 310, or may have different inclination angles.
  • the tilt angle of the first tilt light signal 11 relative to the fingerprint sensor 310 is 30°
  • the tilt angle of the second tilt light signal 12 relative to the fingerprint sensor 310 is also 30°.
  • the tilt angle of the first tilt light signal 11 relative to the fingerprint sensor 310 is 30°, and the tilt angle of the second tilt light signal 12 relative to the fingerprint sensor 310 is also 45°.
  • the first oblique light signal 11 and the second oblique light signal 12 have the same inclination angle with respect to the fingerprint sensor 310 as an example for description, which is not limited in the present application.
  • Figs. 4 to 8 only use the light intensity of the first oblique light signal 11 and the light intensity of the second oblique light signal 12.
  • the strong ratio of identifying planar fake fingerprints is described as an example.
  • the difference between the light intensity of the first oblique light signal 11 and the light intensity of the second oblique light signal 12 can also be used to identify planar fake fingerprints. It's concise, so I won't repeat it here.
  • the first photosensitive area 311 in the fingerprint sensor 310 receives the first oblique light signal 11 returned from the finger above the OLED display screen, and the first oblique light signal 11 is a light signal dominated by s waves. 31 The light signal returned after irradiating the finger.
  • the second light-sensitive area 312 in the fingerprint sensor 310 receives the second oblique light signal 12 returned from the finger above the OLED display screen.
  • the second oblique light signal 12 is the light signal 32 mainly p-wave after irradiating the finger The returned light signal.
  • the s-wave-based optical signal 31 and the p-wave-based optical signal 32 may be optical signals emitted by the light-emitting layer of the OLED display screen.
  • the incident direction of the first oblique optical signal 11 is perpendicular to the first polarization direction 20, and the incident direction of the second oblique optical signal 12 is parallel to the first polarization direction 20.
  • the first oblique light signal 11 and the second oblique light signal 12 have the same inclination angle with respect to the fingerprint sensor 310.
  • the reflectivity of s-wave and p-wave are different.
  • the reflectivity of s-wave R s can be as shown in formula 1
  • the reflectivity R p can be as shown in Equation 2.
  • the law of refraction can be as shown in formula 3.
  • the light intensities of the first oblique light signal 11 and the second oblique light signal 12 are different.
  • the following takes ⁇ 28 degrees as an example for detailed explanation.
  • the "glass-air" interface corresponding to the valley line of the fingerprint, its reflected light intensity is 2A 0
  • the valley line of the fingerprint is diffusely reflected light
  • its diffuse reflection intensity is A 1
  • the "glass-air" interface corresponding to the valley line of the fingerprint, its reflected light intensity is A 0
  • the valley line of the fingerprint is diffusely reflected light
  • its diffuse reflection intensity is A 1
  • the ratio p real of the light intensity of the first oblique light signal 11 to the light intensity of the second oblique light signal 12 can be as shown in Equation 4. Show.
  • the 2D plane fake finger presses the first photosensitive area 311 and the second photosensitive area 312, it is impossible to completely contact the plane fake fingerprint and the glass cover of the OLED display screen, and there will be an air gap, as shown in FIG. 7.
  • the "glass-air" interface corresponding to the white line (equivalent to the valley line of a true fingerprint) has a reflected light intensity of 2A 0 , and the white line is diffusely reflected light, and its diffuse reflection intensity is A 1 ;
  • the black line (equivalent to the ridge line of the true fingerprint) corresponds to the "glass-air” interface, and its reflected light intensity is 2A 0 , and the black line is diffuse reflection light.
  • the “glass-air” interface corresponding to the white line has a reflected light intensity of A 0 , and the white line is a diffuse reflection light, and its diffuse reflection intensity is A 1 ;
  • the black line (equivalent to the ridge line of a true fingerprint) corresponds to the "glass-air” interface, and its reflected light intensity is A 0 , and the black line is diffuse reflection light.
  • the ratio p fake of the light intensity of the first oblique light signal 11 to the light intensity of the second oblique light signal 12 can be as follows: 5 shown.
  • the fingerprint sensor 310 further includes a third photosensitive area 313.
  • the third photosensitive area 313 is used to receive the vertical light signal 13 returned from the finger above the display screen.
  • the vertical light signal 13 is used to obtain the fingerprint image of the finger.
  • the incident direction is perpendicular to the fingerprint sensor 310.
  • the first photosensitive area 311 and the second photosensitive area 312 are respectively located on the upper two sides of one side of the third photosensitive area 313.
  • the first photosensitive area 311 and the second photosensitive area 312 are respectively located on the upper two sides of the first side A and the second side B of the third photosensitive area 313, so The first side A is an opposite side of the second side B, and the first photosensitive area 311 and the second photosensitive area 312 are alternately distributed around the third photosensitive area 313.
  • the first photosensitive area 311 and the second photosensitive area 312 are alternately located around the third photosensitive area 313.
  • first photosensitive area 311 and the second photosensitive area 312 are respectively located on the upper two sides of one side of the third photosensitive area 313, and there may be fingers deviated to cause the first photosensitive area 311 And the second photosensitive area 312 is not pressed, thereby affecting the recognition of real and fake fingers.
  • the first photosensitive area 311 and the second photosensitive area 312 are alternately located on both sides above the first side and the second side of the third photosensitive area 313, or the first photosensitive area 311 and the The second photosensitive area 312 is alternately located around the third photosensitive area 313. When the finger is pressed, the first photosensitive area 311 and the second photosensitive area 312 will also be pressed. Recognition of real and fake fingers.
  • the area of the first photosensitive area 311 and the second photosensitive area 312 are the same, and the area of the first photosensitive area 311 and the second photosensitive area 312 is smaller than that of the third photosensitive area 313 area.
  • the light intensity difference between the first oblique light signal 11 and the second oblique light signal 12 is used to identify the authenticity of the finger, and the vertical light signal 13 is used to obtain the finger. Fingerprint image.
  • the areas of the first photosensitive area 311, the second photosensitive area 312, and the third photosensitive area 313 are the same.
  • the light intensity difference between the first oblique light signal 11 and the second oblique light signal 12 is used to identify the authenticity of the finger; the first oblique light signal 11 is also used to obtain the The fingerprint image of the finger, and/or, the second oblique light signal 12 is also used to obtain the fingerprint image of the finger; and the vertical light signal 13 is used to obtain the fingerprint image of the finger.
  • the device 300 further includes a light path guiding structure 320, wherein the light path guiding structure 320 is used to transmit the first oblique light signal 11 to the first photosensitive area 311
  • At least one first pixel unit 3110 in the second light-sensitive area 312 transmits the second oblique light signal 12 to at least one second pixel unit 3120 in the second photosensitive area 312, and transmits the vertical light signal 13 to the first At least one third pixel unit 3130 in the three photosensitive regions 313.
  • the optical path guiding structure 320 includes:
  • the first microlens array 321 includes at least one first microlens unit for converging the first oblique light signal 11, and the first microlens unit corresponds to the first pixel unit 3110 one-to-one;
  • the second microlens array 322 includes at least one second microlens unit for condensing the second oblique light signal 12, and the second microlens unit corresponds to the second pixel unit 3120 one-to-one;
  • the third microlens array 323 includes at least one third microlens unit for condensing the vertical optical signal 13, and the third microlens unit corresponds to the third pixel unit 3130 one-to-one;
  • At least one light blocking layer 324 is disposed under the first microlens array 321, the second microlens array 322, and the third microlens array 323, wherein,
  • Each light blocking layer 324 includes at least one first opening 3241 respectively corresponding to the at least one first microlens unit, and the first oblique light signal 11 condensed by each first microlens unit passes through different The first opening 3241 in the light blocking layer 324 corresponding to each of the first microlens units reaches the first pixel unit 3110 corresponding to each of the first microlens units;
  • Each light blocking layer 324 includes at least one second opening 3242 corresponding to the at least one second microlens unit, and the second oblique light signal 12 condensed by each second microlens unit passes through different The second opening 3242 corresponding to each second microlens unit in the light blocking layer 324 reaches the second pixel unit 3120 corresponding to each second microlens unit;
  • Each light blocking layer 324 includes at least one third opening 3243 respectively corresponding to the at least one third microlens unit, and the vertical light signal 13 condensed by each third microlens unit passes through different light blocking
  • the third opening 3243 corresponding to each third microlens unit in the layer 324 reaches the third pixel unit 3130 corresponding to each third microlens unit.
  • the first microlens array 321, the second microlens array 322 and the third microlens array 323 are located on the same plane.
  • the microlens array (the first microlens array 321, the second microlens array 322, or the second microlens array 322)
  • a transparent medium layer is also provided between the three microlens array 323), at least one light blocking layer 324 (the first light blocking layer LS 1 and the second light blocking layer LS 2 ), and the pixel units in the fingerprint sensor 310.
  • the transparent medium layer is used to connect the first microlens array 321, the second microlens array 322, the third microlens array 323, at least one light blocking layer 324, and the pixel unit in the fingerprint sensor 310, and fill at least one blocking layer.
  • the transparent medium layer can transmit optical signals in the target wavelength band (that is, optical signals in the wavelength band required for fingerprint identification).
  • the transparent dielectric layer can be oxide or nitride.
  • the transparent medium layer may include multiple layers to realize functions such as protection, transition, and buffering respectively.
  • the first microlens array 321, the second microlens array 322, and the third microlens array 323 are disposed on the upper surface of the transparent medium layer.
  • the vertical distance between the pixel unit in the fingerprint sensor 310 and the first light blocking layer LS 1 is P 0
  • the first light blocking layer LS 1 and the second light blocking layer LS 2 the vertical distance between the microlens array LS 2 is P 1
  • the second light blocking layer (a first microlens array 321, microlens array 322 of the second or the third microlens array 323) is the vertical distance between P 2 .
  • the first microlens array 321 and the third microlens array 323 are separated by a first distance D1, and/or, the second microlens array 322 is separated from the The third microlens array 323 is spaced apart by the first distance D1.
  • the projection of the condensing surface of the micro lens unit in the light path guiding structure 320 on a plane perpendicular to the optical axis may be rectangular or circular.
  • the condensing surface of the micro lens unit in the light path guiding structure 320 is a surface used to converge light.
  • the condensing surface may be spherical or aspherical.
  • the curvature of the condensing surface in all directions is the same, so that the imaging focus of each direction of the micro lens unit in the light path guiding structure 320 can be at the same position, thereby ensuring the imaging quality.
  • adjacent light-blocking layers 324 are separated by the same distance in the vertical direction; the first openings 3241 in adjacent light-blocking layers 324 corresponding to the same first microlens unit are horizontally separated.
  • a second distance D2 in the direction to transmit the first oblique light signal 11 to the at least one first pixel unit 3110, and/or the adjacent light blocking layer 324 corresponding to the same second microlens unit The second openings 3242 are spaced apart by the second distance D2 in the horizontal direction to transmit the second oblique light signal 12 to the at least one second pixel unit 3120.
  • the distance between adjacent light-blocking layers 324 in the vertical direction may also be different.
  • the first openings 3241 in the adjacent light-blocking layers 324 corresponding to the same first microlens unit The distance in the horizontal direction is no longer the same, and the distance in the horizontal direction between the second openings 3242 in the adjacent light blocking layer 324 corresponding to the same second microlens unit is no longer the same.
  • the apertures of the openings in different light blocking layers 324 corresponding to the same microlens unit are sequentially reduced from top to bottom.
  • connection line of the corresponding first opening should be inclined, and its inclination angle is approximately equal to the inclination angle of the first inclined optical signal 11.
  • the connection lines of the second openings corresponding to each second microlens unit in different light blocking layers should be oblique ,
  • the tilt angle is approximately equal to the tilt angle of the second tilted optical signal 12.
  • the connection line of the third opening corresponding to each third microlens unit in different light blocking layers should be vertical.
  • FIG. 11 only takes the fingerprint sensor 310 including the first photosensitive area 311 and the second photosensitive area 312 and the third photosensitive area 313 as an example for description.
  • the fingerprint sensor 310 may also only include the first photosensitive area 311 and the second photosensitive area 312. It is only necessary to delete the relevant description of the third photosensitive area 313 in FIG. 11, for example, delete the third micro
  • the lens array 323, the first light-blocking layer LS 1 and the second light-blocking layer LS 2 are also not provided with a third opening 3243, which is not repeated here for the sake of brevity.
  • the first photosensitive area 311 and the second photosensitive area 312 are respectively located on the upper two sides of one side of the third photosensitive area 313.
  • the first microlens unit in the first microlens array 321 cooperates with the first opening 3241 in the at least one light blocking layer 324 to guide the first oblique optical signal 11 to the first
  • the first pixel unit 3110 in the photosensitive area 311; the second microlens unit in the second microlens array 322 cooperates with the second opening 3242 in the at least one light blocking layer 324 to guide the second oblique light signal 12 to The second pixel unit 3120 in the second photosensitive area 312;
  • the third microlens unit in the third microlens array 323 cooperates with the third opening 3243 in the at least one light blocking layer 324 to guide the vertical light signal 13 to The third pixel unit 3130 in the third photosensitive area 313.
  • the fingerprint sensor 310 includes two first photosensitive areas 311, two second photosensitive areas 312, and a third photosensitive area 313.
  • the first photosensitive area 311 and the second photosensitive area 312 are respectively located On the upper two sides of the first side A and the second side B of the third photosensitive area 313, the first photosensitive area 311 and the second photosensitive area 312 are alternately distributed around the third photosensitive area 313.
  • the first microlens unit in the first microlens array 321 cooperates with the first opening 3241 in the at least one light blocking layer 324 to guide the first oblique light signal 11 to the first light-sensitive area 311
  • a pixel unit 3110 the second microlens unit in the second microlens array 322 cooperates with the second opening 3242 in the at least one light blocking layer 324 to guide the second oblique light signal 12 to the second photosensitive area 312
  • the third micro lens unit in the third micro lens array 323 cooperates with the third opening 3243 in the at least one light blocking layer 324 to guide the vertical light signal 13 to the third photosensitive area 313
  • the third pixel unit 3130 the third pixel unit 3130.
  • the area of the first photosensitive area 311 and the second photosensitive area 312 are the same, and the first photosensitive area 311 and the The area of the second photosensitive area 312 is smaller than the area of the third photosensitive area 313. That is, the light intensity difference between the first oblique light signal 11 and the second oblique light signal 12 is used to identify the authenticity of the finger, and the vertical light signal 13 is used to obtain a fingerprint image of the finger.
  • the corresponding function of the above-mentioned optical path guiding structure 320 can also be realized through the collimating hole, which is not limited in the present application.
  • At least one first photosensitive area in the fingerprint sensor receives the first oblique light signal returned from the finger above the display screen
  • at least one second photosensitive area in the fingerprint sensor receives the first oblique light signal returned from the upper portion of the display screen.
  • the second oblique light signal returned by the finger recognizes the true or false of the finger based on the light intensity difference between the first oblique light signal and the second oblique light signal, thereby being able to identify a flat fake fingerprint, thereby improving the security of fingerprint recognition.
  • FIG. 14 is a schematic flowchart of a fingerprint identification method 400 according to an embodiment of the present application.
  • the method 400 is suitable for under the display screen to realize under-screen optical fingerprint identification. As shown in FIG. 14, the method 400 includes:
  • the second oblique optical signal returned by the finger wherein the incident direction of the first oblique optical signal is perpendicular to the first polarization direction, and the incident direction of the second oblique optical signal is parallel to the first polarization direction, so
  • the first polarization direction is the polarization direction output by the linear polarization unit disposed on the optical path between the finger and the fingerprint sensor;
  • S420 Identify the authenticity of the finger according to the light intensity difference between the first oblique light signal and the second oblique light signal.
  • the method 400 may be executed by a fingerprint recognition device, such as the device 300 in the foregoing embodiment.
  • S410 may be executed by the fingerprint sensor 310 in the device 300
  • S420 may be executed by the processor in the device 300,
  • a Micro Control Unit MCU
  • the method 400 can also be executed by an electronic device installed in the fingerprint recognition device 300, for example, S420 can be executed by a processor in the electronic device, such as a Host module
  • a processor in the electronic device such as a Host module
  • the first oblique optical signal is an optical signal returned after irradiating the finger with an optical signal dominated by s-waves
  • the second oblique optical signal is an optical signal with p-wave as The main light signal illuminates the finger and returns the light signal.
  • the identifying the authenticity of the finger according to the light intensity difference between the first oblique light signal and the second oblique light signal includes:
  • the light intensity ratio identifies the true and false of the finger.
  • the identifying the authenticity of the finger according to the light intensity difference between the first oblique light signal and the second oblique light signal includes:
  • the difference between the light intensity of the first oblique light signal and the light intensity of the second oblique light signal belongs to the first range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the identifying the authenticity of the finger according to the light intensity ratio of the first oblique light signal and the second oblique light signal includes:
  • the ratio of the light intensity of the first oblique light signal to the light intensity of the second oblique light signal belongs to the second range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the intensities of the first oblique light signal and the second oblique light signal include the intensity of diffuse reflection light from the finger, and the intensity of the diffuse reflection light from the finger on the display The intensity of the reflected light at the contact interface on the screen.
  • the method 400 further includes:
  • the fingerprint image of the finger is acquired according to the first oblique light signal, and/or the fingerprint image of the finger is acquired according to the second oblique light signal.
  • the first tilt light signal and the second tilt light signal have the same tilt angle with respect to the fingerprint sensor.
  • the method 400 further includes:
  • the first photosensitive area and the second photosensitive area are respectively located on two upper sides of one side of the third photosensitive area.
  • the first photosensitive area and the second photosensitive area are respectively located on two sides above the first side and the second side of the third photosensitive area, and the first The side is the opposite side of the second side, and the first photosensitive area and the second photosensitive area are alternately distributed around the third photosensitive area.
  • the areas of the first photosensitive area and the second photosensitive area are the same, and the areas of the first photosensitive area and the second photosensitive area are smaller than those of the third photosensitive area.
  • the area of the photosensitive area is the same, and the areas of the first photosensitive area and the second photosensitive area are smaller than those of the third photosensitive area.
  • the areas of the first photosensitive region, the second photosensitive region, and the third photosensitive region are the same.
  • the display screen is an OLED display screen
  • the first oblique light signal and the second oblique light signal are transmitted by the light signal emitted by the light-emitting layer of the OLED display screen. Describe the light signal returned by the finger.
  • An embodiment of the present application further provides an electronic device 500.
  • the electronic device 500 includes the fingerprint recognition device 300 in the various embodiments of the present application, as well as a display screen 510 and a processor 520.
  • the device 300 includes a fingerprint sensor, at least one first photosensitive area of the fingerprint sensor is used to receive a first tilt light signal returned from a finger above the display screen, and at least one second photosensitive area of the fingerprint sensor
  • the photosensitive area is used to receive the second oblique light signal returned from the finger above the display screen, the incident direction of the first oblique light signal is perpendicular to the first polarization direction, and the incident direction of the second oblique light signal Parallel to the first polarization direction, the first polarization direction is the polarization direction output by the linear polarization unit arranged on the optical path between the finger and the fingerprint sensor;
  • the light intensity difference between the oblique light signal and the second oblique light signal identifies the authenticity of the finger.
  • the processor 520 is configured to:
  • the authenticity of the finger is identified according to the light intensity difference and/or ratio between the first oblique light signal and the second oblique light signal.
  • the processor 520 is specifically configured to:
  • the difference between the light intensity of the first oblique light signal and the light intensity of the second oblique light signal belongs to the first range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the processor 520 is specifically configured to:
  • the ratio of the light intensity of the first oblique light signal to the light intensity of the second oblique light signal belongs to the second range, identify the finger as a real finger; or,
  • the finger is identified as a fake finger.
  • the display screen 510 is an OLED display screen
  • the first oblique light signal and the second oblique light signal are light signals emitted by the light-emitting layer of the OLED display screen.
  • the display screen 510 may be a common non-folding display screen, and the display screen may also be a foldable display screen, or referred to as 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, complete or partial functions that can be realized without relying on smart phones, such as smart watches or smart glasses, etc., and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as various types of smart bracelets, smart jewelry and other equipment for physical sign monitoring.
  • the processor or processing unit of the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (Field Programmable Gate Array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP Digital Signal Processor
  • ASIC application specific integrated circuit
  • FPGA Field Programmable Gate Array
  • the methods, steps, and logical block diagrams disclosed in the embodiments of the present application can be implemented or executed.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the face recognition in the embodiments of the present application may further include a memory
  • the memory may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static random access memory
  • DRAM dynamic random access memory
  • DRAM synchronous dynamic random access memory
  • DDR SDRAM Double Data Rate Synchronous Dynamic Random Access Memory
  • Enhanced SDRAM, ESDRAM Enhanced Synchronous Dynamic Random Access Memory
  • Synchronous Link Dynamic Random Access Memory Synchronous Link Dynamic Random Access Memory
  • DR RAM Direct Rambus RAM
  • the embodiment of the present application also proposes a computer-readable storage medium that stores one or more programs, and the one or more programs include instructions.
  • the instructions are included in a portable electronic device that includes multiple application programs When executed, the portable electronic device can be made to execute the content of the method embodiment.
  • the embodiment of the present application also proposes a computer program, the computer program includes instructions, when the computer program is executed by a computer, the computer can execute the content of the method embodiment.
  • An embodiment of the present application also provides a chip that includes an input and output interface, at least one processor, at least one memory, and a bus.
  • the at least one memory is used to store instructions
  • the at least one processor is used to call the at least one memory. Instructions to execute the content of the method embodiment.

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Abstract

一种指纹识别的装置、方法和电子设备，能够提高指纹识别的安全性。所述指纹识别的装置适用于显示屏下方以实现屏下光学指纹识别，所述指纹识别的装置包括指纹传感器，所述指纹传感器包括：至少一个第一感光区域，用于接收从显示屏上方的手指返回的第一倾斜光信号；至少一个第二感光区域，用于接收从显示屏上方的手指返回的第二倾斜光信号；第一倾斜光信号的入射方向垂直于第一偏振方向，第二倾斜光信号的入射方向平行于第一偏振方向，第一偏振方向为设置于手指与指纹传感器之间的光路上的线偏振单元输出的偏振方向，第一倾斜光信号与第二倾斜光信号的光强差异用于识别手指的真假。

Description

指纹识别的装置、方法和电子设备 技术领域
本申请实施例涉及指纹识别领域，并且更具体地，涉及一种指纹识别的装置、方法和电子设备。
背景技术
光学屏下指纹识别技术是通过采集光线在手指发生反射或透射形成的光信号，该光信号中携带手指的指纹信息，从而实现屏下指纹识别。但是，通过用户指纹照片(例如，打印的或电子的)等伪造的平面假指纹数据可以欺骗指纹识别系统，使得指纹识别应用的安全性变差。因此，如何识别真假指纹，以提升指纹识别的安全性是一项亟需解决的问题。
发明内容
本申请实施例提供了一种指纹识别的装置、方法和电子设备，能够识别平面假指纹，从而能够提升指纹识别的安全性。
第一方面，提供了一种指纹识别的装置，适用于显示屏下方以实现屏下光学指纹识别，所述装置包括指纹传感器，所述指纹传感器包括：
至少一个第一感光区域，所述第一感光区域用于接收从所述显示屏上方的手指返回的第一倾斜光信号；
至少一个第二感光区域，所述第二感光区域用于接收从所述显示屏上方的所述手指返回的第二倾斜光信号；
其中，所述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向，所述第一倾斜光信号与所述第二倾斜光信号的光强差异用于识别所述手指的真假。
在一种可能的实现方式中，所述第一倾斜光信号为以s波为主的光信号照射所述手指之后返回的光信号，所述第二倾斜光信号为以p波为主的光信号照射所述手指之后返回的光信号。
在一种可能的实现方式中，所述第一倾斜光信号与所述第二倾斜光信号 的光强差值和/或比值用于识别所述手指的真假。
在一种可能的实现方式中，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
在一种可能的实现方式中，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
在一种可能的实现方式中，所述第一倾斜光信号和所述第二倾斜光信号的强度包括来自所述手指的漫反射光强度，以及包括来自所述手指在所述显示屏上的接触界面处的反射光强度。
在一种可能的实现方式中，所述第一倾斜光信号还用于获取所述手指的指纹图像，和/或，所述第二倾斜光信号还用于获取所述手指的指纹图像。
在一种可能的实现方式中，所述第一倾斜光信号与所述第二倾斜光信号相对于所述指纹传感器具有相同的倾斜角度。
在一种可能的实现方式中，所述指纹传感器还包括：
第三感光区域，用于接收从所述显示屏上方的所述手指返回的垂直光信号，所述垂直光信号用于获取所述手指的指纹图像，所述垂直光信号的入射方向垂直于所述指纹传感器。
在一种可能的实现方式中，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域一边的上方两侧。
在一种可能的实现方式中，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域的第一边和第二边的上方两侧，所述第一边为所述第二边的对边，且所述第一感光区域和所述第二感光区域围绕所述第三感光区域交替分布。
在一种可能的实现方式中，所述第一感光区域和所述第二感光区域的面积相同，且所述第一感光区域和所述第二感光区域的面积小于所述第三感光区域的面积。
在一种可能的实现方式中，所述第一感光区域、所述第二感光区域和所述第三感光区域的面积相同。
在一种可能的实现方式中，所述装置还包括光路引导结构，其中，所述光路引导结构用于将所述第一倾斜光信号传输至所述第一感光区域中的至少一个第一像素单元，将所述第二倾斜光信号传输至所述第二感光区域中的至少一个第二像素单元，以及将所述垂直光信号传输至所述第三感光区域中至少一个第三像素单元。
在一种可能的实现方式中，所述光路引导结构包括：
第一微透镜阵列，包括至少一个第一微透镜单元，用于会聚所述第一倾斜光信号，所述第一微透镜单元与所述第一像素单元一一对应；
第二微透镜阵列，包括至少一个第二微透镜单元，用于会聚所述第二倾斜光信号，所述第二微透镜单元与所述第二像素单元一一对应；
第三微透镜阵列，包括至少一个第三微透镜单元，用于会聚所述垂直光信号，所述第三微透镜单元与所述第三像素单元一一对应；
至少一个挡光层，设置在所述第一微透镜阵列、所述第二微透镜阵列和所述第三微透镜阵列的下方，其中，
每个挡光层包括与所述至少一个第一微透镜单元分别对应的至少一个第一开孔，经每个第一微透镜单元会聚后的所述第一倾斜光信号穿过不同挡光层内与所述每个第一微透镜单元对应的所述第一开孔，到达所述每个第一微透镜单元对应的所述第一像素单元；
每个挡光层包括与所述至少一个第二微透镜单元分别对应的至少一个第二开孔，经每个第二微透镜单元会聚后的所述第二倾斜光信号穿过不同挡光层内与所述每个第二微透镜单元对应的所述第二开孔，到达所述每个第二微透镜单元对应的所述第二像素单元；
每个挡光层包括与所述至少一个第三微透镜单元分别对应的至少一个第三开孔，经每个第三微透镜单元会聚后的所述垂直光信号穿过不同挡光层内与所述每个第三微透镜单元对应的所述第三开孔，到达所述每个第三微透镜单元对应的所述第三像素单元。
在一种可能的实现方式中，所述第一微透镜阵列与所述第三微透镜阵列之间间隔第一距离，和/或，所述第二微透镜阵列与所述第三微透镜阵列之间间隔所述第一距离。
在一种可能的实现方式中，相邻挡光层在垂直方向上间隔相同的距离；相邻挡光层内与相同第一微透镜单元对应的第一开孔之间在水平方向上间隔第二距离，以将所述第一倾斜光信号传输至所述至少一个第一像素单元，和/或，相邻挡光层内与相同第二微透镜单元对应的第二开孔之间在水平方向上间隔所述第二距离，以将所述第二倾斜光信号传输至所述至少一个第二像素单元。
在一种可能的实现方式中，不同挡光层内与相同微透镜单元对应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，所述显示屏为有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏，所述第一倾斜光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
第二方面，提供了一种指纹识别的方法，适用于显示屏下方以实现屏下光学指纹识别，所述方法包括：
通过指纹传感器的至少一个第一感光区域接收从所述显示屏上方的手指返回的第一倾斜光信号，以及通过所述指纹传感器的至少一个第二感光区域接收从所述显示屏上方的所述手指返回的第二倾斜光信号，其中，所述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向；
根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假。
在一种可能的实现方式中，所述第一倾斜光信号为以s波为主的光信号照射所述手指之后返回的光信号，所述第二倾斜光信号为以p波为主的光信号照射所述手指之后返回的光信号。
在一种可能的实现方式中，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假，包括：
根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值识别所述手指的真假，和/或，根据所述第一倾斜光信号与所述第二倾斜光信号的光强比值识别所述手指的真假。
在一种可能的实现方式中，所述根据所述第一倾斜光信号与所述第二倾 斜光信号的光强差值识别所述手指的真假，包括：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
在一种可能的实现方式中，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强比值识别所述手指的真假，包括：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
在一种可能的实现方式中，所述第一倾斜光信号和所述第二倾斜光信号的强度包括来自所述手指的漫反射光强度，以及包括来自所述手指在所述显示屏上的接触界面处的反射光强度。
在一种可能的实现方式中，所述方法还包括：
根据所述第一倾斜光信号获取所述手指的指纹图像，和/或，根据所述第二倾斜光信号获取所述手指的指纹图像。
在一种可能的实现方式中，所述第一倾斜光信号与所述第二倾斜光信号相对于所述指纹传感器具有相同的倾斜角度。
在一种可能的实现方式中，所述方法还包括：
通过所述指纹传感器的第三感光区域接收从所述显示屏上方的所述手指返回的垂直光信号，所述垂直光信号的入射方向垂直于所述指纹传感器；
根据所述垂直光信号获取所述手指的指纹图像。
在一种可能的实现方式中，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域一边的上方两侧。
在一种可能的实现方式中，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域的第一边和第二边的上方两侧，所述第一边为所述第二边的对边，且所述第一感光区域和所述第二感光区域围绕所述第三感光区域交替分布。
在一种可能的实现方式中，所述第一感光区域和所述第二感光区域的面积相同，且所述第一感光区域和所述第二感光区域的面积小于所述第三感光 区域的面积。
在一种可能的实现方式中，所述第一感光区域、所述第二感光区域和所述第三感光区域的面积相同。
在一种可能的实现方式中，所述显示屏为OLED显示屏，所述第一倾斜光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
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识别的装置，以及显示屏和处理器；
其中，所述指纹传感器的至少一个第一感光区域用于接收从所述显示屏上方的手指返回的第一倾斜光信号，所述指纹传感器的至少一个第二感光区域用于接收从所述显示屏上方的所述手指返回的第二倾斜光信号，所述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向；所述处理器用于根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假。
在一种可能的实现方式中，所述处理器用于：
根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值和/或比值识别所述手指的真假。
在一种可能的实现方式中，所述处理器具体用于：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
在一种可能的实现方式中，所述处理器具体用于：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
在一种可能的实现方式中，所述显示屏为OLED显示屏，所述第一倾斜 光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
第四方面，提供了一种计算机可读介质，用于存储计算机程序，所述计算机程序包括用于执行上述第二方面及其任一可能的实现方式中的指令。
第五方面，提供了一种包括指令的计算机程序产品，当计算机运行所述计算机程序产品的所述指时，所述计算机执行上述第二方面及其任一可能的实现方式中的指纹识别的方法。
具体地，该计算机程序产品可以运行于上述第三方面的电子设备上。
基于上述技术方案，指纹传感器中的至少一个第一感光区域接收从显示屏上方的手指返回的第一倾斜光信号，指纹传感器中的至少一个第二感光区域接收从显示屏上方的手指返回的第二倾斜光信号，基于第一倾斜光信号与第二倾斜光信号的光强差异识别手指的真假，从而能够识别平面假指纹，进而提升指纹识别的安全性。
附图说明
图1A和图2A是本申请可以适用的电子设备的结构示意图。
图1B和图2B分别是图1A和图2A所示的电子设备沿A-A’方向的剖面示意图。
图3是本申请实施例的指纹识别的装置的示意性框图。
图4是本申请实施例的指纹识别的装置的一种示意性结构图。
图5是本申请实施例提供的s波和p波随折射角θ的变化曲线图。
图6是本申请实施例提供真手指识别过程中反射光的光强示意图。
图7是本申请实施例提供平面假手指识别过程中反射光的光强示意图。
图8是本申请实施例提供的p real和p fake随A 1/A 0的变化曲线图。
图9是本申请实施例的指纹识别的装置的另一种示意性结构图。
图10是本申请实施例的指纹识别的装置的再一种示意性结构图。
图11是本申请实施例的基于光路引导结构的指纹识别的装置的示意图。
图12是本申请实施例的基于光路引导结构的指纹识别的装置的一种示意性结构图。
图13是本申请实施例的基于光路引导结构的指纹识别的装置的另一种示意性结构图。
图14是本申请实施例的指纹识别的方法的示意性流程图。
图15是本申请实施例的电子设备的示意性框图。
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系统，包括但不限于光学、超声波或其他指纹识别系统和基于光学、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系统为例进行说明，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系统等。
作为一种常见的应用场景，本申请实施例提供的光学指纹系统可以应用在智能手机、平板电脑以及其他具有显示屏的移动终端或者其他电子设备；更具体地，在上述电子设备中，指纹模组可以具体为光学指纹模组或者指纹识别的装置，其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或Under-screen)光学指纹系统。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或In-screen)光学指纹系统。
光学屏下指纹识别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，通过采集和检测该返回的光，实现位于显示屏下方的特定光学传感器模块。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1A和图2A示出了本申请实施例可以适用的电子设备的结构示意图。以及图1B和图2B分别是图1A和图2A所示的电子设备沿A-A’方向的剖面示意图。
所述电子设备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设置在所述显示屏120下方的局部区域。所述光学指纹模组130包括光学指纹传感器，所述光学指纹传感器包括具有多个光学感应单元131(也可以称为像素、感光像素、像素单元等)的感应阵列133。所述感应阵列133所在区域或者其感应区域为所述光学指纹模组130的指纹检测区域103(也称为指纹采集区域、指纹识别区域等)。如图1A所示，所述指纹检 测区域103位于所述显示屏120的显示区域之中。在一种替代实施例中，所述光学指纹模组130还可以设置在其他位置，比如所述显示屏120的侧面或者所述电子设备10的边缘非透光区域，并通过光路设计来将来自所述显示屏120的至少部分显示区域的光信号导引到所述光学指纹模组130，从而使得所述指纹检测区域103实际上位于所述显示屏120的显示区域。
应当理解，所述指纹检测区域103的面积可以与所述光学指纹模组130的感应阵列133的面积不同，例如通过例如透镜成像的光路设计、反射式折叠光路设计或者其他光线汇聚或者反射等光路设计，可以使得所述光学指纹模组130的指纹检测区域103的面积大于所述光学指纹模组130的感应阵列133的面积。在其他替代实现方式中，如果采用例如光线准直方式进行光路引导，所述光学指纹模组130的指纹检测区域103也可以设计成与所述光学指纹模组130的感应阵列的面积基本一致。
因此，使用者在需要对所述电子设备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所述显示屏120的指纹检测区域103，便可以实现指纹输入。由于指纹检测可以在屏内实现，因此采用上述结构的电子设备10无需其正面专门预留空间来设置指纹按键(比如Home键)，从而可以采用全面屏方案，即所述显示屏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1B所示，所述光学指纹模组130包括光检测部分134和光学组件132。所述光检测部分134包括所述感应阵列133以及与所述感应阵列133电性连接的读取电路及其他辅助电路，其可以在通过半导体工艺制作在一个芯片(Die)上，比如光学成像芯片或者光学指纹传感器。所述感应阵列133具体为光探测器(Photo detector)阵列，其包括多个呈阵列式分布的光探测器，所述光探测器可以作为如上所述的光学感应单元。所述光学组件132可以设置在所述光检测部分134的感应阵列133的上方，其可以具体包括滤光层(Filter)、导光层(也称光路引导结构)、以及其他光学元件，所述滤光层可以用于滤除穿透手指的环境光，而所述导光层主要用于从手指表面反射回来的反射光导引至所述感应阵列133进行光学检测。
在具体实现上，所述光学组件132可以与所述光检测部分134封装在同一个光学指纹部件。比如，所述光学组件132可以与所述光学检测部分134 封装在同一个光学指纹芯片，也可以将所述光学组件132设置在所述光检测部分134所在的芯片外部，比如将所述光学组件132贴合在所述芯片上方，或者将所述光学组件132的部分元件集成在上述芯片之中。
其中，所述光学组件132的导光层有多种实现方案，比如，所述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微孔阵列，所述准直单元可以具体为小孔，从手指反射回来的反射光中，垂直入射到所述准直单元的光线可以穿过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所述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，从而所述感应阵列133便可以检测出手指的指纹图像。
在另一种实现方式中，所述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，比如一个或多个非球面透镜组成的透镜组，其用于将从手指反射回来的反射光汇聚到其下方的光检测部分134的感应阵列133，以使得所述感应阵列133可以基于所述反射光进行成像，从而得到所述手指的指纹图像。可选地，所述光学透镜层在所述透镜单元的光路中还可以形成有针孔，所述针孔可以配合所述光学透镜层扩大所述光学指纹模组130的视场，以提高所述光学指纹模组130的指纹成像效果。
在其他实现方式中，所述导光层也可以具体采用微透镜(Micro-Lens)层，所述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所述光检测部分134的感应阵列133上方，并且每一个微透镜可以分别对应于所述感应阵列133的其中一个感应单元。并且，所述微透镜层和所述感应单元之间还可以形成其他光学膜层，比如介质层或者钝化层。更具体地，所述微透镜层和所述感应单元之间还可以包括具有微孔(或称为开孔)的挡光层(或称为遮光层、阻光层等)，其中所述微孔形成在其对应的微透镜和感应单元之间，所述挡光层可以阻挡相邻微透镜和感应单元之间的光学干扰，并使得所述感应单元所对应的光线通过所述微透镜汇聚到所述微孔内部并经由所述微孔传输到所述感应单元以进行光学指纹成像。
应当理解，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。比如，可以在所述准直器层或者所述光学透镜层的上方或下方进一步设置微透镜层。当然，在所述准直器层或者所述光学透镜层与所述微透镜层结合使 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。
作为一种可选的实现方式，所述显示屏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，所述光学指纹模组130可以利用所述OLED显示屏120位于所述指纹检测区域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按压在所述指纹检测区域103时，显示屏120向所述指纹检测区域103上方的目标手指140发出一束光111，该光111在手指140的表面发生反射形成反射光或者经过所述手指140内部散射而形成散射光。在相关专利申请中，为便于描述，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所接收并转换为相应的电信号，即指纹检测信号；基于所述指纹检测信号便可以获得指纹图像数据，并且可以进一步进行指纹匹配验证，从而在电子设备10实现光学指纹识别功能。
在其他实现方式中，所述光学指纹模组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，所述光学指纹模组130可以适用于非自发光显示屏，比如液晶显示屏或者其他的被动发光显示屏。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，所述电子设备10的光学指纹系统还可以包括用于光学指纹检测的激励光源，所述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，其可以设置在所述液晶显示屏的背光模组下方或者设置在所述电子设备10的保护盖板下方的边缘区域，而所述光学指纹模组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所述光学指纹模组130；或者，所述光学指纹模组130也可以设置在所述背光模组下方，且所述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所述光学指纹模组130。当采用所述光学指纹模组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。
在具体实现上，所述电子设备10还可以包括透明保护盖板，所述盖板可以为玻璃盖板或者蓝宝石盖板，其位于所述显示屏120的上方并覆盖所述电子设备10的正面。因此，本申请实施例中，所谓的手指按压在所述显示屏120实际上是指按压在所述显示屏120上方的盖板或者覆盖所述盖板的保护层表面。
所述电子设备10还可以包括电路板150，该电路板设置在所述光学指纹模组130的下方。光学指纹模组130可以通过背胶粘接在所述电路板150上，并通过焊盘及金属线焊接与所述电路板150实现电性连接。光学指纹模组130可以通过电路板150实现与其他外围电路或者电子设备10的其他元件的电性互连和信号传输。比如光学指纹模组130可以通过电路板150接收终端设备10的处理单元的控制信号，并且还可以通过电路板150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，所述光学指纹模组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，所述光学指纹模组130可以具体包括多个光学指纹传感器。所述多个光学指纹传感器可以通过拼接方式并排设置在所述显示屏120的下方，且所述多个光学指纹传感器的感应区域共同构成所述光学指纹模组130的指纹检测区域103。从而所述光学指纹模组130的指纹检测区域103可以扩展到所述显示屏的下半部分的主要区域，即扩展到手指惯常按压区域，从而实现盲按式指纹输入操作。进一步地，当所述光学指纹传感器数量足够时，所述指纹检测区域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2A和图2B所示的电子设备10，所述电子设备10中的光学指纹装置130包括多个光学指纹传感器时，所述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所述显示屏120的下方，且所述多个光学指纹传感器的感应区域共同构成所述光学指纹装置130的指纹检测区域103。
可选地，与所述光学指纹装置130的多个光学指纹传感器相对应，所述光学组件132中可以有多个导光层，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，所述多个光 学指纹传感器也可以共享一个整体的导光层，即所述导光层具有一个足够大的面积以覆盖所述多个光学指纹传感器的感应阵列。另外，所述光学组件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，其可以设置在所述导光层和所述光学指纹传感器之间或者设置在所述显示屏120与所述导光层之间，主要用于隔离外界干扰光对光学指纹检测的影响。其中，所述滤光片可以用于滤除穿透手指并经过所述显示屏120进入所述光学指纹传感器的环境光，与所述导光层相类似，所述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所述多个光学指纹传感器。
所述光路调制器也可以采用光学镜头(Lens)来代替，所述光学镜头上方可以通过遮光材料形成小孔配合所述光学镜头将指纹检测光汇聚到下方的光学指纹传感器以实现指纹成像。相类似地，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，所述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汇聚和指纹成像。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所述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。
以上所示的指纹传感器的数量、尺寸和排布情况仅为示例，可以根据实际需求进行调整。例如，该多个指纹传感器的个数可以为2个、3个、4个或5个等，该多个指纹传感器可以呈方形或圆形分布等。
本申请实施例可以应用于平面假指纹的识别，尤其能够适用于打印在纸张上的或者电子的平面假指纹的识别。目前采用垂直光线进行指纹识别的方案对平面假指纹的识别效果欠佳，而本申请实施例提供的指纹识别的方案能够识别平面假指纹，从而提升指纹识别的安全性。
本申请实施例的指纹识别的装置适用于显示屏下方以实现屏下光学指纹识别。图3示出了本申请实施例的指纹识别的装置300的示意图。该装置300包括指纹传感器310，所述指纹传感器310包括至少一个第一感光区域311和至少一个第二感光区域312，其中，所述第一感光区域311用于接收从所述显示屏上方的手指返回的第一倾斜光信号11；所述第二感光区域312用于接收从所述显示屏上方的所述手指返回的第二倾斜光信号12。
其中，所述第一倾斜光信号11的入射方向垂直于第一偏振方向20，所 述第二倾斜光信号12的入射方向平行于所述第一偏振方向20，所述第一偏振方向20为设置于所述手指与所述指纹传感器310之间的光路上的线偏振单元输出的偏振方向，所述第一倾斜光信号11与所述第二倾斜光信号12的光强差异用于识别所述手指的真假。
需要说明的是，所述第一倾斜光信号11的入射方向垂直于或者近似垂直于所述第一偏振方向20，所述第二倾斜光信号12的入射方向平行于或者近似平行于所述第一偏振方向20。也就是说，所述第一倾斜光信号11的入射方向与所述第一偏振方向20可以不是绝对的垂直，所述第二倾斜光信号12的入射方向与所述第一偏振方向20可以不是绝对的平行。
可选地，所述显示屏为OLED显示屏，所述第一倾斜光信号11和所述第二倾斜光信号12为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
所述线偏振单元可以集成在所述显示屏内部，从而作为显示屏的一部分，例如作为OLED显示屏的一部分，位于OLED显示屏的发光层的上方。在所述显示屏为OLED显示屏的情况下，所述第一偏振方向20也可以理解为所述OLED显示屏出射光的偏振方向。
可选地，所述第一倾斜光信号11为以s波为主的光信号照射所述手指之后返回的光信号，所述第二倾斜光信号12为以p波为主的光信号照射所述手指之后返回的光信号。
应理解，入射光振动方向平行于入射面，称为p波；入射光振动方向垂直于入射面，称为s波。
可选地，所述第一倾斜光信号11与所述第二倾斜光信号12的光强差异可以是所述第一倾斜光信号11与所述第二倾斜光信号12的光强差值和/或所述第一倾斜光信号11与所述第二倾斜光信号12的光强比值。
例如，若所述第一倾斜光信号11的光强与所述第二倾斜光信号12的光强的差值属于第一范围，则识别所述手指为真手指；或者，若所述第一倾斜光信号11的光强与所述第二倾斜光信号12的光强的差值不属于所述第一范围，则识别所述手指为假手指。
需要说明的是，所述第一范围为基于真手指大量训练得到的所述第一倾斜光信号11的光强与所述第二倾斜光信号12的光强的差值的一个范围。
又例如，若所述第一倾斜光信号11的光强与所述第二倾斜光信号12的 光强的比值属于第二范围，则识别所述手指为真手指；或者，若所述第一倾斜光信号11的光强与所述第二倾斜光信号12的光强的比值不属于所述第二范围，则识别所述手指为假手指。
需要说明的是，所述第二范围为基于真手指大量训练得到的所述第一倾斜光信号11的光强与所述第二倾斜光信号12的光强的比值的一个范围。
可选地，所述第一倾斜光信号11和所述第二倾斜光信号12的强度包括来自所述手指的漫反射光强度，以及包括来自所述手指在所述显示屏上的接触界面处的反射光强度。
需要说明的是，来自手指的漫反射光强度可以包括来自手指纹路谷线和手指纹路脊线的漫反射光强度。
作为一个可选的实现方式，所述第一倾斜光信号11还用于获取所述手指的指纹图像，和/或，所述第二倾斜光信号12还用于获取所述手指的指纹图像。即所述第一倾斜光信号11和所述第二倾斜光信号12除了可以进行真假手指的识别，还可以进行指纹图像的采集。例如，在所述第一感光区域311足够大的情况下，所述第一倾斜光信号11还用于获取所述手指的指纹图像。同理，在所述第二感光区域312足够大的情况下，所述第二倾斜光信号12还用于获取所述手指的指纹图像。
可选地，在本申请实施例中，所述第一倾斜光信号11与所述第二倾斜光信号12相对于所述指纹传感器310可以具有相同的倾斜角度，也可以具有不同的倾斜角度。
例如，所述第一倾斜光信号11相对于所述指纹传感器310的倾斜角度为30°，所述第二倾斜光信号12相对于所述指纹传感器310的倾斜角度也为30°。
又例如，所述第一倾斜光信号11相对于所述指纹传感器310的倾斜角度为30°，所述第二倾斜光信号12相对于所述指纹传感器310的倾斜角度也为45°。
以下以所述第一倾斜光信号11与所述第二倾斜光信号12相对于所述指纹传感器310具有相同的倾斜角度为例进行说明，本申请对此并不限定。
下面结合图4至图8对本申请实施例的真假手指识别原理进行详细说明，图4至图8仅以所述第一倾斜光信号11的光强与所述第二倾斜光信号12的光强的比值识别平面假指纹为例进行说明，当然，所述第一倾斜光信号 11的光强与所述第二倾斜光信号12的光强的差值也可以用于识别平面假指纹，为了简洁，在此不再赘述。
如图4所示，指纹传感器310中的第一感光区域311接收从OLED显示屏上方的手指返回的第一倾斜光信号11，所述第一倾斜光信号11为以s波为主的光信号31照射手指之后返回的光信号。所述指纹传感器310中的第二感光区域312接收从OLED显示屏上方的手指返回的第二倾斜光信号12，所述第二倾斜光信号12为以p波为主的光信号32照射手指之后返回的光信号。s波为主的光信号31和p波为主的光信号32可以是OLED显示屏的发光层射出的光信号。
如图4中的俯视图所示，所述第一倾斜光信号11的入射方向垂直于第一偏振方向20，所述第二倾斜光信号12的入射方向平行于第一偏振方向20。如图4中的切面图所示，所述第一倾斜光信号11与所述第二倾斜光信号12相对于所述指纹传感器310具有相同的倾斜角度。
需要说明的是，同样的入射角i和折射角θ，s波和p波的反射率是不一样的，根据菲涅尔公式，s波的反射率R s可以如公式1所示，p波的反射率R p可以如公式2所示。折射定律可以如公式3所示。
Figure PCTCN2019103202-appb-000001
Figure PCTCN2019103202-appb-000002
Figure PCTCN2019103202-appb-000003
需要说明的是，OLED显示屏的等效折射率n＝1.5。
基于上述公式1至公式3可以得到如图5所示的s波的反射率R s、p波的反射率R p随折射角θ的变化曲线。如图5所示，随着θ的增大，s波反射率R s不断增大，而p波的反射率R p不断变小，二者差距变大。
由图5可知，第一倾斜光信号11和第二倾斜光信号12的光强是不一样的，当θ＝28度时，s波反射率近似为p波反射率的2倍。为了方便表述，以下以θ＝28度为例进行详细阐述。
真手指按压第一感光区域311和第二感光区域312，如图6所示。对于第一感光区域311，手指纹路谷线对应的“玻璃-空气”界面，其反射光强度为2A 0，手指纹路谷线呈漫反射光，其漫反射强度为A 1，手指纹路脊线接触 到显示屏玻璃盖板，呈漫反射光，其漫反射强度为A 1，因此，第一感光区域311的总反射光强度为2A 0+A 1+A 1＝2A 0+2A 1，即第一倾斜光信号11的光强为2A 0+2A 1。对于第二感光区域312，手指纹路谷线对应的“玻璃-空气”界面，其反射光强度为A 0，手指纹路谷线呈漫反射光，其漫反射强度为A 1，手指纹路脊线接触到显示屏玻璃盖板，呈漫反射光，其漫反射强度为A 1，因此，第二感光区域312的总反射光强度为A 0+A 1+A 1＝A 0+2A 1，即第二倾斜光信号12的光强为A 0+2A 1。
在真(real)手指按压第一感光区域311和第二感光区域312的情况下，第一倾斜光信号11的光强与第二倾斜光信号12的光强的比值p real可以如公式4所示。
Figure PCTCN2019103202-appb-000004
2D平面假手指按压第一感光区域311和第二感光区域312，平面假指纹和OLED显示屏玻璃盖板之间不可能完全接触，会存在空气间隙，如图7所示。对于第一感光区域311，白线(相当于真指纹的纹路谷线)对应的“玻璃-空气”界面，其反射光强度为2A 0，白线呈漫反射光，其漫反射强度为A 1；黑线(相当于真指纹的纹路脊线)对应的“玻璃-空气”界面，其反射光强度为2A 0，黑线呈漫反射光，假设其漫反射强度为0.8*A 1，因此，第一感光区域311的总反射光强度为2A 0+A1+2A 0+0.8A 1＝4A 0+1.8A 1，即第一倾斜光信号11的光强为4A 0+1.8A 1。对于第二感光区域312，白线(相当于真指纹的纹路谷线)对应的“玻璃-空气”界面，其反射光强度为A 0，白线呈漫反射光，其漫反射强度为A 1；黑线(相当于真指纹的纹路脊线)对应的“玻璃-空气”界面，其反射光强度为A 0，黑线呈漫反射光，同样假设其漫反射强度为0.8*A 1，因此，第二感光区域312的总反射光强度为A 0+A 1+A 0+0.8A 1＝2A 0+1.8A 1，即第二倾斜光信号12的光强为2A 0+1.8A 1。
在2D平面假(fake)手指按压第一感光区域311和第二感光区域312的情况下，第一倾斜光信号11的光强与第二倾斜光信号12的光强的比值p fake可以如公式5所示。
Figure PCTCN2019103202-appb-000005
基于上述公式4至公式5可以得到如图8所示的p real、p fake随A 1/A 0的变化曲线。如图8所示，当A 1/A 0不断变化时，p fake始终大于p real，根据这个规律，可以区分出2D平面假指纹的按压，即识别真假手指。
可选地，在一些实施例中，所述指纹传感器310还包括第三感光区域313。
所述第三感光区域313用于接收从所述显示屏上方的所述手指返回的垂直光信号13，所述垂直光信号13用于获取所述手指的指纹图像，所述垂直光信号13的入射方向垂直于所述指纹传感器310。
可选地，如图9所示，所述第一感光区域311和所述第二感光区域312分别位于所述第三感光区域313一边的上方两侧。
可选地，如图10所示，所述第一感光区域311和所述第二感光区域312分别位于所述第三感光区域313的第一边A和第二边B的上方两侧，所述第一边A为所述第二边B的对边，且所述第一感光区域311和所述第二感光区域312围绕所述第三感光区域313交替分布。
可选地，所述第一感光区域311和所述第二感光区域312交替位于所述第三感光区域313的四周。
需要说明的是，所述第一感光区域311和所述第二感光区域312分别位于所述第三感光区域313一边的上方两侧，可能会存在手指按偏而导致所述第一感光区域311和所述第二感光区域312出现未按压的情况，从而，影响真假手指的识别。而所述第一感光区域311和所述第二感光区域312交替位于所述第三感光区域313的第一边和第二边的上方两侧，或者，所述第一感光区域311和所述第二感光区域312交替位于所述第三感光区域313的四周，则在手指按偏的情况下，所述第一感光区域311和所述第二感光区域312也会出现按压，从而，能够进行真假手指的识别。
可选地，所述第一感光区域311和所述第二感光区域312的面积相同，且所述第一感光区域311和所述第二感光区域312的面积小于所述第三感光区域313的面积。在这种情况下，所述第一倾斜光信号11与所述第二倾斜光信号12的光强差异用于识别所述手指的真假，而所述垂直光信号13用于获取所述手指的指纹图像。
可选地，所述第一感光区域311、所述第二感光区域312和所述第三感光区域313的面积相同。在这种情况下，所述第一倾斜光信号11与所述第 二倾斜光信号12的光强差异用于识别所述手指的真假；所述第一倾斜光信号11还用于获取所述手指的指纹图像，和/或，所述第二倾斜光信号12还用于获取所述手指的指纹图像；以及所述垂直光信号13用于获取所述手指的指纹图像。
可选地，在一些实施例中，所述装置300还包括光路引导结构320，其中，所述光路引导结构320用于将所述第一倾斜光信号11传输至所述第一感光区域311中的至少一个第一像素单元3110，将所述第二倾斜光信号12传输至所述第二感光区域312中的至少一个第二像素单元3120，以及将所述垂直光信号13传输至所述第三感光区域313中至少一个第三像素单元3130。
可选地，所述光路引导结构320包括：
第一微透镜阵列321，包括至少一个第一微透镜单元，用于会聚所述第一倾斜光信号11，所述第一微透镜单元与所述第一像素单元3110一一对应；
第二微透镜阵列322，包括至少一个第二微透镜单元，用于会聚所述第二倾斜光信号12，所述第二微透镜单元与所述第二像素单元3120一一对应；
第三微透镜阵列323，包括至少一个第三微透镜单元，用于会聚所述垂直光信号13，所述第三微透镜单元与所述第三像素单元3130一一对应；
至少一个挡光层324，设置在所述第一微透镜阵列321、所述第二微透镜阵列322和所述第三微透镜阵列323的下方，其中，
每个挡光层324包括与所述至少一个第一微透镜单元分别对应的至少一个第一开孔3241，经每个第一微透镜单元会聚后的所述第一倾斜光信号11穿过不同挡光层324内与所述每个第一微透镜单元对应的所述第一开孔3241，到达所述每个第一微透镜单元对应的所述第一像素单元3110；
每个挡光层324包括与所述至少一个第二微透镜单元分别对应的至少一个第二开孔3242，经每个第二微透镜单元会聚后的所述第二倾斜光信号12穿过不同挡光层324内与所述每个第二微透镜单元对应的所述第二开孔3242，到达所述每个第二微透镜单元对应的所述第二像素单元3120；
每个挡光层324包括与所述至少一个第三微透镜单元分别对应的至少一个第三开孔3243，经每个第三微透镜单元会聚后的所述垂直光信号13穿过不同挡光层324内与所述每个第三微透镜单元对应的所述第三开孔3243，到达所述每个第三微透镜单元对应的所述第三像素单元3130。
可选地，所述第一微透镜阵列321、所述第二微透镜阵列322和所述第 三微透镜阵列323位于同一平面。
例如，如图11所示，在指纹传感器310的有效感光区域(Active Array，AA)区上方的光路引导结构320中，微透镜阵列(第一微透镜阵列321、第二微透镜阵列322或第三微透镜阵列323)、至少一个挡光层324(第一挡光层LS 1和第二挡光层LS 2)、以及指纹传感器310中的像素单元之间还设置有透明介质层。
其中，透明介质层用于连接第一微透镜阵列321、第二微透镜阵列322、第三微透镜阵列323、至少一个挡光层324、以及指纹传感器310中的像素单元，并填充至少一个挡光层324中的开孔。
可选地，透明介质层可透过目标波段的光信号(即指纹识别所需波段的光信号)。例如，透明介质层可采用氧化物或氮化物等。透明介质层可以包括多层，以分别实现保护、过渡和缓冲等功能。
可选地，如图11所示，第一微透镜阵列321、第二微透镜阵列322和第三微透镜阵列323设置于透明介质层的上表面。
需要说明的是，如图11所示，指纹传感器310中的像素单元与第一挡光层LS 1之间的垂直距离为P 0，第一挡光层LS 1与第二挡光层LS 2之间的垂直距离为P 1，第二挡光层LS 2与微透镜阵列(第一微透镜阵列321、第二微透镜阵列322或第三微透镜阵列323)之间的垂直距离为P 2。
可选地，如图11所示，所述第一微透镜阵列321与所述第三微透镜阵列323之间间隔第一距离D1，和/或，所述第二微透镜阵列322与所述第三微透镜阵列323之间间隔所述第一距离D1。
所述光路引导结构320中的微透镜单元的聚光面在与其光轴垂直的平面上的投影可以为矩形或者圆形。所述光路引导结构320中的微透镜单元的聚光面是用于对光线起会聚作用的面。该聚光面可以是球面也可以是非球面。优选地，该聚光面在各个方向上的曲率相同，这样可以使光路引导结构320中的微透镜单元的各个方向的成像焦点在同一位置，从而保证成像质量。
可选地，如图11所示，相邻挡光层324在垂直方向上间隔相同的距离；相邻挡光层324内与相同第一微透镜单元对应的第一开孔3241之间在水平方向上间隔第二距离D2，以将所述第一倾斜光信号11传输至所述至少一个第一像素单元3110，和/或，相邻挡光层324内与相同第二微透镜单元对应的第二开孔3242之间在水平方向上间隔所述第二距离D2，以将所述第二倾 斜光信号12传输至所述至少一个第二像素单元3120。
需要说明的是，相邻挡光层324在垂直方向上间隔的距离也可以不同，此种情况下，相邻挡光层324内与相同第一微透镜单元对应的第一开孔3241之间在水平方向上间隔的距离不再相同，以及相邻挡光层324内与相同第二微透镜单元对应的第二开孔3242之间在水平方向上间隔的距离不再相同。
可选地，如图11所示，第一挡光层LS 1上的第二开孔S1和第三开孔S2之间间隔第三距离D3，且第三距离D3小于第一距离D1。
可选地，不同挡光层324内与相同微透镜单元对应的开孔的孔径由上至下依次减小。
由于通过挡光层内的开孔对光线进行引导，因此，为了使第一倾斜光信号11到达第一感光区域311中的第一像素单元，不同挡光层内与每个第一微透镜单元对应的第一开孔的连线应为倾斜的，其倾斜角度近似等于第一倾斜光信号11的倾斜角度。同理，为了使第二倾斜光信号12到达第二感光区域312中的第二像素单元，不同挡光层内与每个第二微透镜单元对应的第二开孔的连线应为倾斜的，其倾斜角度近似等于第二倾斜光信号12的倾斜角度。同理，为了使垂直光信号13到达第三感光区域313中的第三像素单元，不同挡光层内与每个第三微透镜单元对应的第三开孔的连线应为垂直的。
应理解，本申请实施例不考虑光线在各个挡光层之间的折射。
需要说明的是，上述图11仅以指纹传感器310既包括第一感光区域311和第二感光区域312，又包括第三感光区域313为例进行说明。在本申请实施例中指纹传感器310还可以仅包括第一感光区域311和第二感光区域312，只需要删除上述图11中关于第三感光区域313的相关描述即可，例如，删除第三微透镜阵列323，第一挡光层LS 1与第二挡光层LS 2中也未设置第三开孔3243，为了简洁，在此不再赘述。
可选地，第一感光区域311和第二感光区域312分别位于第三感光区域313一边的上方两侧。具体地，如图12所示，第一微透镜阵列321中的第一微透镜单元与至少一个挡光层324中的第一开孔3241配合，以将第一倾斜光信号11引导至第一感光区域311中的第一像素单元3110；第二微透镜阵列322中的第二微透镜单元与至少一个挡光层324中的第二开孔3242配合，以将第二倾斜光信号12引导至第二感光区域312中的第二像素单元3120；第三微透镜阵列323中的第三微透镜单元与至少一个挡光层324中的第三开 孔3243配合，以将垂直光信号13引导至第三感光区域313中的第三像素单元3130。
可选地，如图13所示，指纹传感器310包括两个第一感光区域311、两个第二感光区域312和一个第三感光区域313，第一感光区域311和第二感光区域312分别位于第三感光区域313的第一边A和第二边B的上方两侧，第一感光区域311和第二感光区域312围绕第三感光区域313交替分布。具体地，第一微透镜阵列321中的第一微透镜单元与至少一个挡光层324中的第一开孔3241配合，以将第一倾斜光信号11引导至第一感光区域311中的第一像素单元3110；第二微透镜阵列322中的第二微透镜单元与至少一个挡光层324中的第二开孔3242配合，以将第二倾斜光信号12引导至第二感光区域312中的第二像素单元3120；第三微透镜阵列323中的第三微透镜单元与至少一个挡光层324中的第三开孔3243配合，以将垂直光信号13引导至第三感光区域313中的第三像素单元3130。
需要说明的是，在上述图12和图13所示的指纹传感器310中，所述第一感光区域311和所述第二感光区域312的面积相同，且所述第一感光区域311和所述第二感光区域312的面积小于所述第三感光区域313的面积。即所述第一倾斜光信号11与所述第二倾斜光信号12的光强差异用于识别所述手指的真假，而所述垂直光信号13用于获取所述手指的指纹图像。
需要说明的是，在本申请实施例中，也可以通过准直孔现实上述光路引导结构320的相应功能，本申请对此并不限定。
因此，在本申请实施例中，指纹传感器中的至少一个第一感光区域接收从显示屏上方的手指返回的第一倾斜光信号，指纹传感器中的至少一个第二感光区域接收从显示屏上方的手指返回的第二倾斜光信号，基于第一倾斜光信号与第二倾斜光信号的光强差异识别手指的真假，从而能够识别平面假指纹，进而提升指纹识别的安全性。
图14是本申请实施例的指纹识别的方法400的示意性流程图，该方法400适用于显示屏下方以实现屏下光学指纹识别，如图14所示，该方法400包括：
S410，通过指纹传感器的至少一个第一感光区域接收从所述显示屏上方的手指返回的第一倾斜光信号，以及通过所述指纹传感器的至少一个第二感光区域接收从所述显示屏上方的所述手指返回的第二倾斜光信号，其中，所 述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向；
S420，根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假。
应理解，该方法400可以由指纹识别的装置执行，例如前述实施例中的装置300，具体地，S410可以由该装置300中的指纹传感器310执行，S420可以由该装置300中的处理器，例如微控制单元(Micro Control Unit，MCU)执行；或者，该方法400也可以由该指纹识别的装置300所安装的电子设备执行，例如，S420可以由电子设备中的处理器，例如Host模块执行，本申请实施例对此不作限定。
可选地，在本申请一些实施例中，所述第一倾斜光信号为以s波为主的光信号照射所述手指之后返回的光信号，所述第二倾斜光信号为以p波为主的光信号照射所述手指之后返回的光信号。
可选地，在本申请一些实施例中，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假，包括：
根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值识别所述手指的真假，和/或，根据所述第一倾斜光信号与所述第二倾斜光信号的光强比值识别所述手指的真假。
可选地，在本申请一些实施例中，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值识别所述手指的真假，包括：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
可选地，在本申请一些实施例中，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强比值识别所述手指的真假，包括：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
可选地，在本申请一些实施例中，所述第一倾斜光信号和所述第二倾斜光信号的强度包括来自所述手指的漫反射光强度，以及包括来自所述手指在所述显示屏上的接触界面处的反射光强度。
可选地，在本申请一些实施例中，所述方法400还包括：
根据所述第一倾斜光信号获取所述手指的指纹图像，和/或，根据所述第二倾斜光信号获取所述手指的指纹图像。
可选地，在本申请一些实施例中，所述第一倾斜光信号与所述第二倾斜光信号相对于所述指纹传感器具有相同的倾斜角度。
可选地，在本申请一些实施例中，所述方法400还包括：
通过所述指纹传感器的第三感光区域接收从所述显示屏上方的所述手指返回的垂直光信号，所述垂直光信号的入射方向垂直于所述指纹传感器；
根据所述垂直光信号获取所述手指的指纹图像。
可选地，在本申请一些实施例中，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域一边的上方两侧。
可选地，在本申请一些实施例中，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域的第一边和第二边的上方两侧，所述第一边为所述第二边的对边，且所述第一感光区域和所述第二感光区域围绕所述第三感光区域交替分布。
可选地，在本申请一些实施例中，所述第一感光区域和所述第二感光区域的面积相同，且所述第一感光区域和所述第二感光区域的面积小于所述第三感光区域的面积。
可选地，在本申请一些实施例中，所述第一感光区域、所述第二感光区域和所述第三感光区域的面积相同。
可选地，在本申请一些实施例中，所述显示屏为OLED显示屏，所述第一倾斜光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
本申请实施例还提供了一种电子设备500，如图15所示，该电子设备500包括上述本申请各种实施例中的指纹识别的装置300，以及显示屏510和处理器520。
具体地，所述装置300包括指纹传感器，所述指纹传感器的至少一个第一感光区域用于接收从所述显示屏上方的手指返回的第一倾斜光信号，所述 指纹传感器的至少一个第二感光区域用于接收从所述显示屏上方的所述手指返回的第二倾斜光信号，所述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向；所述处理器用于根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假。
可选地，在一些实施例中，所述处理器520用于：
根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值和/或比值识别所述手指的真假。
可选地，在一些实施例中，所述处理器520具体用于：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
可选地，在一些实施例中，所述处理器520具体用于：
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
可选地，在一些实施例中，所述显示屏510为OLED显示屏，所述第一倾斜光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
可选地，该显示屏510可以为普通的非折叠显示屏，该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的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等设备。
应理解，本申请实施例的处理器或处理单元可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(Digital Signal Processor，DSP)、专用集成电路(Application Specific Integrated Circuit，ASIC)、现成可编程门阵列(Field Programmable Gate Array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例的人脸识别还可以包括存储器，存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(Read-Only Memory，ROM)、可编程只读存储器(Programmable ROM，PROM)、可擦除可编程只读存储器(Erasable PROM，EPROM)、电可擦除可编程只读存储器(Electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(Random Access Memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(Static RAM，SRAM)、动态随机存取存储器(Dynamic RAM，DRAM)、同步动态随机存取存储器(Synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(Double Data Rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(Enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(Synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(Direct Rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请实施例还提出了一种计算机可读存储介质，该计算机可读存储介质存储一个或多个程序，该一个或多个程序包括指令，该指令当被包括多个 应用程序的便携式电子设备执行时，能够使该便携式电子设备执行方法实施例的内容。
本申请实施例还提出了一种计算机程序，该计算机程序包括指令，当该计算机程序被计算机执行时，使得计算机可以执行方法实施例的内容。
本申请实施例还提供了一种芯片，该芯片包括输入输出接口、至少一个处理器、至少一个存储器和总线，该至少一个存储器用于存储指令，该至少一个处理器用于调用该至少一个存储器中的指令，以执行方法实施例的内容。
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 (38)

  1. 一种指纹识别的装置，其特征在于，适用于显示屏下方以实现屏下光学指纹识别，所述装置包括指纹传感器，所述指纹传感器包括：
    至少一个第一感光区域，所述第一感光区域用于接收从所述显示屏上方的手指返回的第一倾斜光信号；
    至少一个第二感光区域，所述第二感光区域用于接收从所述显示屏上方的所述手指返回的第二倾斜光信号；
    其中，所述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向，所述第一倾斜光信号与所述第二倾斜光信号的光强差异用于识别所述手指的真假。
  2. 根据权利要求1所述的装置，其特征在于，所述第一倾斜光信号为以s波为主的光信号照射所述手指之后返回的光信号，所述第二倾斜光信号为以p波为主的光信号照射所述手指之后返回的光信号。
  3. 根据权利要求1或2所述的装置，其特征在于，所述第一倾斜光信号与所述第二倾斜光信号的光强差值和/或比值用于识别所述手指的真假。
  4. 根据权利要求3所述的装置，其特征在于，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
  5. 根据权利要求3或4所述的装置，其特征在于，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
  6. 根据权利要求1至5中任一项所述的装置，其特征在于，所述第一倾斜光信号和所述第二倾斜光信号的强度包括来自所述手指的漫反射光强度，以及包括来自所述手指在所述显示屏上的接触界面处的反射光强度。
  7. 根据权利要求1至6中任一项所述的装置，其特征在于，所述第一 倾斜光信号还用于获取所述手指的指纹图像，和/或，所述第二倾斜光信号还用于获取所述手指的指纹图像。
  8. 根据权利要求1至7中任一项所述的装置，其特征在于，所述第一倾斜光信号与所述第二倾斜光信号相对于所述指纹传感器具有相同的倾斜角度。
  9. 根据权利要求1至8中任一项所述的装置，其特征在于，所述指纹传感器还包括：
    第三感光区域，用于接收从所述显示屏上方的所述手指返回的垂直光信号，所述垂直光信号用于获取所述手指的指纹图像，所述垂直光信号的入射方向垂直于所述指纹传感器。
  10. 根据权利要求9所述的装置，其特征在于，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域一边的上方两侧。
  11. 根据权利要求9所述的装置，其特征在于，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域的第一边和第二边的上方两侧，所述第一边为所述第二边的对边，且所述第一感光区域和所述第二感光区域围绕所述第三感光区域交替分布。
  12. 根据权利要求9至11中任一项所述的装置，其特征在于，所述第一感光区域和所述第二感光区域的面积相同，且所述第一感光区域和所述第二感光区域的面积小于所述第三感光区域的面积。
  13. 根据权利要求9至12中任一项所述的装置，其特征在于，所述第一感光区域、所述第二感光区域和所述第三感光区域的面积相同。
  14. 根据权利要求9至13中任一项所述的装置，其特征在于，所述装置还包括光路引导结构，其中，所述光路引导结构用于将所述第一倾斜光信号传输至所述第一感光区域中的至少一个第一像素单元，将所述第二倾斜光信号传输至所述第二感光区域中的至少一个第二像素单元，以及将所述垂直光信号传输至所述第三感光区域中至少一个第三像素单元。
  15. 根据权利要求14所述的装置，其特征在于，所述光路引导结构包括：
    第一微透镜阵列，包括至少一个第一微透镜单元，用于会聚所述第一倾斜光信号，所述第一微透镜单元与所述第一像素单元一一对应；
    第二微透镜阵列，包括至少一个第二微透镜单元，用于会聚所述第二倾 斜光信号，所述第二微透镜单元与所述第二像素单元一一对应；
    第三微透镜阵列，包括至少一个第三微透镜单元，用于会聚所述垂直光信号，所述第三微透镜单元与所述第三像素单元一一对应；
    至少一个挡光层，设置在所述第一微透镜阵列、所述第二微透镜阵列和所述第三微透镜阵列的下方，其中，
    每个挡光层包括与所述至少一个第一微透镜单元分别对应的至少一个第一开孔，经每个第一微透镜单元会聚后的所述第一倾斜光信号穿过不同挡光层内与所述每个第一微透镜单元对应的所述第一开孔，到达所述每个第一微透镜单元对应的所述第一像素单元；
    每个挡光层包括与所述至少一个第二微透镜单元分别对应的至少一个第二开孔，经每个第二微透镜单元会聚后的所述第二倾斜光信号穿过不同挡光层内与所述每个第二微透镜单元对应的所述第二开孔，到达所述每个第二微透镜单元对应的所述第二像素单元；
    每个挡光层包括与所述至少一个第三微透镜单元分别对应的至少一个第三开孔，经每个第三微透镜单元会聚后的所述垂直光信号穿过不同挡光层内与所述每个第三微透镜单元对应的所述第三开孔，到达所述每个第三微透镜单元对应的所述第三像素单元。
  16. 根据权利要求15所述的装置，其特征在于，所述第一微透镜阵列与所述第三微透镜阵列之间间隔第一距离，和/或，所述第二微透镜阵列与所述第三微透镜阵列之间间隔所述第一距离。
  17. 根据权利要求15或16所述的装置，其特征在于，相邻挡光层在垂直方向上间隔相同的距离；相邻挡光层内与相同第一微透镜单元对应的第一开孔之间在水平方向上间隔第二距离，以将所述第一倾斜光信号传输至所述至少一个第一像素单元，和/或，相邻挡光层内与相同第二微透镜单元对应的第二开孔之间在水平方向上间隔所述第二距离，以将所述第二倾斜光信号传输至所述至少一个第二像素单元。
  18. 根据权利要求15至17中任一项所述的装置，其特征在于，不同挡光层内与相同微透镜单元对应的开孔的孔径由上至下依次减小。
  19. 根据权利要求1至18中任一项所述的装置，其特征在于，所述显示屏为有机发光二极管OLED显示屏，所述第一倾斜光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
  20. 一种指纹识别的方法，其特征在于，适用于显示屏下方以实现屏下光学指纹识别，所述方法包括：
    通过指纹传感器的至少一个第一感光区域接收从所述显示屏上方的手指返回的第一倾斜光信号，以及通过所述指纹传感器的至少一个第二感光区域接收从所述显示屏上方的所述手指返回的第二倾斜光信号，其中，所述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向；
    根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假。
  21. 根据权利要求20所述的方法，其特征在于，所述第一倾斜光信号为以s波为主的光信号照射所述手指之后返回的光信号，所述第二倾斜光信号为以p波为主的光信号照射所述手指之后返回的光信号。
  22. 根据权利要求20或21所述的方法，其特征在于，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假，包括：
    根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值识别所述手指的真假，和/或，根据所述第一倾斜光信号与所述第二倾斜光信号的光强比值识别所述手指的真假。
  23. 根据权利要求22所述的方法，其特征在于，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值识别所述手指的真假，包括：
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
  24. 根据权利要求22所述的方法，其特征在于，所述根据所述第一倾斜光信号与所述第二倾斜光信号的光强比值识别所述手指的真假，包括：
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
  25. 根据权利要求20至24中任一项所述的方法，其特征在于，所述第一倾斜光信号和所述第二倾斜光信号的强度包括来自所述手指的漫反射光强度，以及包括来自所述手指在所述显示屏上的接触界面处的反射光强度。
  26. 根据权利要求20至25中任一项所述的方法，其特征在于，所述方法还包括：
    根据所述第一倾斜光信号获取所述手指的指纹图像，和/或，根据所述第二倾斜光信号获取所述手指的指纹图像。
  27. 根据权利要求20至26中任一项所述的方法，其特征在于，所述第一倾斜光信号与所述第二倾斜光信号相对于所述指纹传感器具有相同的倾斜角度。
  28. 根据权利要求20至27中任一项所述的方法，其特征在于，所述方法还包括：
    通过所述指纹传感器的第三感光区域接收从所述显示屏上方的所述手指返回的垂直光信号，所述垂直光信号的入射方向垂直于所述指纹传感器；
    根据所述垂直光信号获取所述手指的指纹图像。
  29. 根据权利要求28所述的方法，其特征在于，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域一边的上方两侧。
  30. 根据权利要求28所述的方法，其特征在于，所述第一感光区域和所述第二感光区域分别位于所述第三感光区域的第一边和第二边的上方两侧，所述第一边为所述第二边的对边，且所述第一感光区域和所述第二感光区域围绕所述第三感光区域交替分布。
  31. 根据权利要求28至30中任一项所述的方法，其特征在于，所述第一感光区域和所述第二感光区域的面积相同，且所述第一感光区域和所述第二感光区域的面积小于所述第三感光区域的面积。
  32. 根据权利要求28至30中任一项所述的方法，其特征在于，所述第一感光区域、所述第二感光区域和所述第三感光区域的面积相同。
  33. 根据权利要求20至32中任一项所述的方法，其特征在于，所述显示屏为有机发光二极管OLED显示屏，所述第一倾斜光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
  34. 一种电子设备，其特征在于，包括：
    如权利要求1至19中任一项所述的装置，以及显示屏和处理器；
    其中，所述装置包括指纹传感器，所述指纹传感器的至少一个第一感光区域用于接收从所述显示屏上方的手指返回的第一倾斜光信号，所述指纹传感器的至少一个第二感光区域用于接收从所述显示屏上方的所述手指返回的第二倾斜光信号，所述第一倾斜光信号的入射方向垂直于第一偏振方向，所述第二倾斜光信号的入射方向平行于所述第一偏振方向，所述第一偏振方向为设置于所述手指与所述指纹传感器之间的光路上的线偏振单元输出的偏振方向；所述处理器用于根据所述第一倾斜光信号与所述第二倾斜光信号的光强差异识别所述手指的真假。
  35. 根据权利要求34所述的电子设备，其特征在于，所述处理器用于：
    根据所述第一倾斜光信号与所述第二倾斜光信号的光强差值和/或比值识别所述手指的真假。
  36. 根据权利要求35所述的电子设备，其特征在于，所述处理器具体用于：
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值属于第一范围，则识别所述手指为真手指；或者，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的差值不属于所述第一范围，则识别所述手指为假手指。
  37. 根据权利要求35或36所述的电子设备，其特征在于，所述处理器具体用于：
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值属于第二范围，则识别所述手指为真手指；或者，
    若所述第一倾斜光信号的光强与所述第二倾斜光信号的光强的比值不属于所述第二范围，则识别所述手指为假手指。
  38. 根据权利要求34至37中任一项所述的电子设备，其特征在于，所述显示屏为OLED显示屏，所述第一倾斜光信号和所述第二倾斜光信号为所述OLED显示屏发光层发射的光信号经所述手指返回的光信号。
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