WO2019061535A1 - 指纹识别的方法、装置和终端设备 - Google Patents

指纹识别的方法、装置和终端设备 Download PDF

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Publication number
WO2019061535A1
WO2019061535A1 PCT/CN2017/105119 CN2017105119W WO2019061535A1 WO 2019061535 A1 WO2019061535 A1 WO 2019061535A1 CN 2017105119 W CN2017105119 W CN 2017105119W WO 2019061535 A1 WO2019061535 A1 WO 2019061535A1
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WIPO (PCT)
Prior art keywords
fingerprint
area
fingerprint recognition
display screen
reflected light
Prior art date
Application number
PCT/CN2017/105119
Other languages
English (en)
French (fr)
Inventor
蒋方林
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 EP17905010.9A priority Critical patent/EP3690701B1/en
Priority to PCT/CN2017/105119 priority patent/WO2019061535A1/zh
Priority to CN201780001242.4A priority patent/CN107820617B/zh
Priority to US16/159,675 priority patent/US10747984B2/en
Publication of WO2019061535A1 publication Critical patent/WO2019061535A1/zh

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/17—Image acquisition using hand-held instruments
    • 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
    • G06V40/1347—Preprocessing; Feature extraction
    • G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
    • 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
    • G06V40/1365—Matching; Classification
    • 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
    • G06V40/1382—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger
    • G06V40/1394—Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger using acquisition arrangements
    • 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
    • G06V40/1341—Sensing with light passing through the 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
    • G06V40/60—Static or dynamic means for assisting the user to position a body part for biometric acquisition
    • G06V40/67—Static or dynamic means for assisting the user to position a body part for biometric acquisition by interactive indications to the user

Definitions

  • the present application relates to the field of information technology, and more particularly, to a method for fingerprint recognition, a fingerprint recognition device, and a terminal device.
  • the fingerprint image can be drawn by using the fingerprint fingerprint to reflect the difference of light, and the fingerprint recognition is implemented on an electronic device such as a mobile phone according to the discrimination of the fingerprint feature point.
  • the fingerprint image needs to acquire the fingerprint image for fingerprint recognition. Therefore, if the fake finger or the fake fingerprint model is made by rubber, plasticine or the like, the fingerprint password can be easily cracked. Information security and property security have caused huge losses.
  • the embodiment of the present invention provides a method, a device, and a terminal device for fingerprint identification, which can effectively identify whether a fingerprint contacting a fingerprint identification area is a living fingerprint or a non-living fingerprint, thereby improving the security of the fingerprint password.
  • a method for fingerprint recognition comprising: detecting a signal value of a reflected light signal generated by an object located above a fingerprint recognition area, wherein the reflected light signal is a light emitted by a display screen in the object And generating, by the reflection, the fingerprint identification area is located in at least part of the display area of the display screen; determining whether the signal value of the reflected light signal is within a preset value range; if the reflected light signal is in a size Within the range of values, it is determined that the object above the fingerprint identification area is a living fingerprint.
  • the size of the optical signal reflected by the finger can be used to determine whether the fingerprint above the fingerprint identification area is a living fingerprint or a non-living fingerprint, thereby improving the security of the fingerprint password.
  • the method further includes determining that the object above the fingerprint recognition area is a non-living fingerprint if the signal value of the reflected light signal is outside the range of values.
  • the reflected light signal is disposed under the display screen
  • the optical fingerprint sensor is detected, and the optical fingerprint sensor includes an inductive array having a plurality of optical sensing units.
  • the light emitted by the display screen presents a preset pattern in the fingerprint recognition area
  • the detecting a signal value of the reflected light signal generated by the object located above the fingerprint recognition area includes: At least a part of the optical sensing unit below the fingerprint identification area detects a signal value of the reflected light signal generated by the display screen reflecting light on the object in the fingerprint recognition area.
  • the preset pattern is a ring pattern
  • the ring pattern corresponds to a light emitting area of the fingerprint recognition area
  • the middle area surrounded by the ring pattern is a non-light emitting area of the fingerprint identification area.
  • the signal value of the reflected light signal generated by detecting the light emitted by the display screen in the fingerprint recognition area on the object includes:
  • An optical sensing unit located under the non-light emitting area detects a signal value of the reflected light signal generated by the display screen in the fingerprint recognition area and the light representing the circular pattern is reflected on the object And wherein the reflected light signal passes through the display screen in the non-light emitting area and is received by the optical sensing unit.
  • the preset pattern covers an entire fingerprint identification area, wherein the detecting the reflection caused by the light emitted by the display screen on the fingerprint recognition area is reflected on the object
  • the signal value of the optical signal including:
  • All optical sensing units located under the fingerprint identification area detect a signal of the reflected light signal generated by the display screen in the fingerprint recognition area covering the entire fingerprint recognition area and reflecting on the object a value, wherein the reflected light signal passes through the display screen in the fingerprint recognition area and is received by the optical sensing unit.
  • the preset pattern is further configured to indicate a location of the fingerprint identification area in the display screen, so that a user determines the fingerprint identification area according to the preset pattern.
  • the method further includes:
  • the fingerprint image is matched with the fingerprint image in the fingerprint database.
  • a fingerprint identification device comprising an optical fingerprint sensor and a processor, wherein the optical fingerprint sensor is configured to detect a signal value of a reflected light signal generated by an object located above the fingerprint recognition area The reflected light signal is generated by the light emitted by the display screen being reflected on the object, and the fingerprint identification area is located at at least part of the display area of the display screen; the processor is configured to: Determining whether a signal value of the reflected light signal detected by the optical fingerprint sensor is within a preset value range, and determining a top of the fingerprint identification area when a signal value of the reflected light signal is in the value range
  • the object is a living fingerprint.
  • the size of the optical signal reflected by the finger can be used to determine whether the fingerprint above the fingerprint identification area is a living fingerprint or a non-living fingerprint, thereby improving the security of the fingerprint password.
  • the processor is further configured to: when the signal value of the reflected optical signal exceeds the value range, determine that the object above the fingerprint identification area is a non-living fingerprint.
  • the optical fingerprint sensor is disposed below the display screen, and the optical fingerprint sensor includes a sensing array having a plurality of optical sensing units.
  • the light emitted by the display screen presents a preset pattern in the fingerprint identification area, wherein at least a part of the optical sensing unit of the optical fingerprint sensor located below the fingerprint identification area is used for Detecting a signal value of the reflected light signal generated by the display screen reflecting light on the object in the fingerprint recognition area.
  • the preset pattern is a ring pattern
  • the ring pattern corresponds to a light emitting area of the fingerprint recognition area
  • the middle area surrounded by the ring pattern is a non-light emitting area of the fingerprint identification area.
  • the optical sensing unit of the optical fingerprint sensor located under the non-light emitting area is configured to detect that the light emitted by the display screen in the fingerprint recognition area and exhibiting the circular pattern is reflected on the object. Generating a signal value of the reflected light signal, wherein the reflected light signal passes through the display screen in the non-light emitting region and is received by the optical sensing unit.
  • the preset pattern covers the entire fingerprint identification area, wherein all optical sensing units of the optical fingerprint sensor located below the fingerprint identification area are used to detect the display screen in the a signal value of the reflected light signal generated by the fingerprint recognition area and the light covering the entire fingerprint recognition area being reflected on the object, wherein the inverse An illuminating signal passes through the display screen in the fingerprint recognition area and is received by the optical sensing unit.
  • the preset pattern is further configured to indicate a location of the fingerprint identification area in the display screen, so that a user determines the fingerprint identification area according to the preset pattern.
  • the optical fingerprint sensor is further configured to perform a fingerprint image according to a reflected light signal generated by the light emitted from the display screen on the object located above the fingerprint recognition area.
  • the processor is further configured to: when determining that the object above the fingerprint identification area is a living fingerprint, match the fingerprint image with a fingerprint image in the fingerprint library.
  • a computer readable medium for storing a computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.
  • a fingerprint identification chip comprising the fingerprint identification device in any of the possible implementations of the second aspect or the second aspect.
  • a terminal device comprising the fingerprint identification device in any of the possible implementations of the second aspect or the second aspect.
  • FIG. 1 is a schematic structural diagram of a terminal device applicable to an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an application scenario of the present application.
  • FIG. 3 is a schematic flowchart of a method for fingerprint recognition according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of detecting a living body fingerprint according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of detecting a non-living fingerprint according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of a fingerprint identification area according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another fingerprint identification area of the embodiment of the present application.
  • FIG. 8 is a schematic block diagram of a fingerprint identification apparatus according to an embodiment of the present application.
  • FIG. 9 is a schematic block diagram of a fingerprint identification chip according to an embodiment of the present application.
  • the embodiments of the present application may be applied to an optical fingerprint system, including but not limited to optical fingers.
  • the embodiment of the present application is only described by taking an optical fingerprinting system as an example, but the embodiment of the present application is not limited to any other embodiment.
  • the embodiment of the present application is also applicable to other optical imaging. Technical systems, etc.
  • the fingerprint image of the finger needs to be acquired in the fingerprint recognition process, and the fingerprint image is matched with the fingerprint in the fingerprint database. If the matching is successful, the unlocking operation is performed.
  • the fingerprint password can be easily cracked by making a fake fingerprint layer identical to the fingerprint image of the finger by a special material.
  • Common materials that can be used to make false fingerprint layers on the market include wood glue, white glue, silica gel, etc., and the fake fingerprint layer can also be obtained by ink printing or the like.
  • the embodiment of the present invention when performing fingerprint recognition, can determine whether the finger touching the fingerprint recognition area is a living fingerprint or a false fingerprint layer based on the difference in characteristics of absorption and reflection of light by the real living fingerprint and the fake fingerprint layer. That is, the non-living fingerprint, thereby improving the security of the fingerprint password.
  • the fingerprint identification method, the fingerprint identification device, and the fingerprint identification chip provided by the embodiments of the present application can be applied to a smart phone, a tablet computer, and other mobile terminals or other terminal devices having a display screen; more specifically,
  • the fingerprint recognition system may be specifically an optical fingerprint system, which may be disposed in a partial area or an entire area below the display screen, thereby forming an under-display optical fingerprint system.
  • FIG. 1 is a schematic structural diagram of a terminal device applicable to an embodiment of the present application.
  • the optical fingerprint system of the terminal device 100 includes a display screen 120 and an optical fingerprint device 130.
  • the optical fingerprint device 130 is disposed on the display. A partial area below the screen 120.
  • the optical fingerprint device 130 may be an optical sensor, which includes an inductive array having a plurality of optical sensing units, and the sensing array is located in the fingerprint identification area 103 of the optical fingerprint device 130.
  • the fingerprint identification area 103 is located in the display area 102 of the display screen 120. Therefore, when the user needs to unlock the terminal device or perform other fingerprint verification, the user only needs to press the finger. Fingerprint input can be implemented in the fingerprint recognition area 103 of the display screen 120.
  • the terminal device 100 adopting the above structure does not need to reserve a space for setting a fingerprint button (such as a Home button) on the front side, so that a full screen scheme, that is, a display area of the display screen 120 can be adopted.
  • the 102 can be substantially extended to the front of the entire terminal device 100.
  • the display screen 120 may be a self-illuminating display screen, which adopts a self-luminous display unit as a display pixel, such as an organic light emitting diode (Organic). Light-Emitting Diode (OLED) display or micro-LED display.
  • OLED Organic light emitting diode
  • the optical fingerprint device 130 can utilize an OLED display unit (ie, an OLED light source) of the OLED display 120 located in the fingerprint recognition area 103 as an excitation light source for optical fingerprint detection.
  • the sensing array of the optical fingerprint device 130 is specifically a photo detector array including a plurality of photodetectors distributed in an array, and the photodetectors can be used as the optical sensing unit as described above.
  • the light emitted by the display unit of the fingerprint recognition area 103 reflects on the fingerprint of the finger surface and forms reflected light, wherein the ridge and valley of the finger fingerprint
  • the reflected light is different, and the reflected light is received from the display screen 120 and converted by the photodetector array into a corresponding electrical signal, that is, a fingerprint detection signal; fingerprint image data can be obtained based on the fingerprint detection signal, And the fingerprint matching verification can be further performed to implement the optical fingerprint recognition function at the terminal device 100.
  • the optical fingerprint device 130 may also be disposed over the entire area below the display screen 120, thereby extending the fingerprint identification area 103 to the entire display area 102 of the display screen 120, Full screen fingerprint detection.
  • the optical fingerprint device 130 may also be disposed in a predetermined area inside the terminal device 100, such as an edge region of the terminal device 100, and a light guiding structure is disposed under the display screen 120 to reflect the surface of the finger. Light is directed to the sensing array of the optical fingerprint device 130.
  • the terminal device 100 further includes a transparent protective cover 110, and the cover plate 110 may be a transparent cover plate, such as a glass cover or a sapphire cover, which is located on the display screen. Above the 120 and covering the front side of the terminal device 100. Because, in the embodiment of the present application, the so-called finger touch, press or proximity on the display screen 120 actually refers to the finger touching, pressing or approaching the cover plate 110 above the display screen 120 or covering the cover plate 110. The surface of the protective layer.
  • the terminal device 100 may further include a touch sensor, which may be specifically a touch panel, which may be disposed on the surface of the display screen 120, or may be partially or integrally integrated into the display screen 120, that is, The display screen 120 is specifically a touch display screen.
  • a touch sensor which may be specifically a touch panel, which may be disposed on the surface of the display screen 120, or may be partially or integrally integrated into the display screen 120, that is, The display screen 120 is specifically a touch display screen.
  • the optical fingerprint device 130 includes a light detecting portion 134 and an optical component 132, and the light detecting portion 134 includes the sensing array and the sensing array electrical a connected read circuit and other auxiliary circuits, which may be fabricated on a chip (Die) by a semiconductor process; the optical component 132 may be disposed in the light detecting portion Above the sensing array of 134, which may specifically include a filter, a light guiding layer, and other optical components, the filter layer may be used to filter ambient light penetrating the finger, and the light guiding layer is mainly Reflected light for reflection back from the surface of the finger is directed to the sensing array for optical detection.
  • the optical component 132 may be packaged in the same optical fingerprint chip as the light detecting portion 134, or may be installed inside the optical fingerprint module.
  • the light guiding layer may be specifically a collimator layer or a lens (Lens) layer made of a semiconductor silicon wafer, and has a plurality of collimating units or lens units, and the collimating unit may be specific As a small hole, among the reflected light reflected from the finger, the light incident perpendicularly to the collimating unit can pass through and be received by the optical sensing unit below it, and the obliquely incident light passes through the inside of the collimating unit. The secondary reflection is attenuated, so that each optical sensing unit can only receive the reflected light reflected from the fingerprint pattern directly above it, so that the sensing array can detect the fingerprint image of the finger.
  • each collimating unit or lens unit may respectively correspond to one of the optical sensing units of the sensing array; alternatively, the collimator unit or the lens unit and the sensing array A non-one-to-one correspondence may also be adopted between the optical sensing units to reduce the occurrence of moire fringe interference.
  • one optical sensing unit may correspond to a plurality of collimating units or lens units, or the collimating unit or the lens unit may also The irregular arrangement may be adopted; the collimated unit or the lens unit arranged in an irregular manner may correct the reflected light detected by each sensing unit by a post-software algorithm.
  • FIG. 2 is a schematic diagram of a specific application scenario of the fingerprint identification method provided by the present application.
  • the optical fingerprint system includes an organic light emitting diode (OLED) display 201 and an optical fingerprint sensor (hereinafter also referred to as a sensor) 202 attached to the bottom of the OLED display 201.
  • OLED organic light emitting diode
  • a sensor optical fingerprint sensor
  • the OLED display screen 201 may correspond to the display screen 120 of the terminal device shown in FIG. 1
  • the optical fingerprint sensor 202 may correspond to the terminal shown in FIG.
  • the optical fingerprint device 130 of the device, and the fingerprint recognition region 203 may correspond to the fingerprint recognition region 103 of the terminal device shown in FIG.
  • the optical fingerprint sensor 202 can include, for example, a sensing array having a plurality of optical sensing units, such as a photodiode (PD) array, and the sensing array area is the fingerprint identification area 203. As shown in FIG. 2, the fingerprint recognition area 203 is located in a partial display area of the OLED display screen. In the process of fingerprint recognition, the finger can touch or press the fingerprint recognition area 103, to achieve fingerprint entry.
  • a sensing array having a plurality of optical sensing units, such as a photodiode (PD) array
  • the sensing array area is the fingerprint identification area 203.
  • the fingerprint recognition area 203 is located in a partial display area of the OLED display screen. In the process of fingerprint recognition, the finger can touch or press the fingerprint recognition area 103, to achieve fingerprint entry.
  • the OLED display 201 When performing fingerprint recognition, the OLED display 201 emits light. When the finger is pressed in the fingerprint recognition area 203, the light is reflected by the OLED display 201 and the finger and then reflected into the sensor 202. The sensor 202 can determine the contact fingerprint according to the received reflected light.
  • the fingerprint of the recognition area 203 is a living fingerprint or a non-living fingerprint.
  • the optical fingerprint system optically implements fingerprint sensing signal detection
  • the OLED display 201 when the user's finger approaches but has not touched or pressed the fingerprint recognition area 203, the OLED display 201 emits light. Reflections may also occur at the surface of the finger, and correspondingly reflected light may also return and pass through the OLED display 201 into the optical fingerprint sensor 202. That is to say, as long as the finger is located above the fingerprint recognition area 203, the optical fingerprint system can perform optical fingerprint collection and subsequent fingerprint recognition operations.
  • FIG. 3 shows a schematic flow chart of a method 300 of fingerprint recognition according to an embodiment of the present application, which may be performed by a fingerprint recognition device, which may include, for example, the optical fingerprint device 130 shown in FIG. 1 or Including the optical fingerprint sensor 202 shown in FIG. 2, the fingerprint recognition device can be located below the fingerprint recognition area of the display screen.
  • the fingerprint identification device in the embodiment of the present application may be a fingerprint identification chip, and the fingerprint identification chip may be a push-type fingerprint recognition chip, a scratch-type fingerprint recognition chip, or a touch-type fingerprint recognition chip. Limited to this.
  • the fingerprint identification device can be located in the terminal device.
  • the terminal device in the embodiment of the present application may be an electronic device equipped with a fingerprint identification device, such as a mobile phone, a tablet computer, a notebook computer, or the like, and may be, for example, a mobile phone with a fingerprint identification chip.
  • the method 300 can include:
  • detecting a signal value of a reflected light signal generated by an object located above the fingerprint recognition area wherein the reflected light signal is generated by reflection of light emitted by the display screen on the object, and the fingerprint identification area is located At least part of the display area of the display.
  • the method further includes: if the signal value of the reflected light signal is outside the numerical range, determining that the object above the fingerprint identification area is a non-living fingerprint.
  • the fingerprint identification area for performing fingerprint detection is located at least part of the display of the display screen
  • the object to be fingerprinted is located above the fingerprint recognition area
  • the reflected light signal generated by the object passes through the display screen to reach the optical fingerprint sensor, and the optical fingerprint sensor detects the The signal value of the reflected light signal generated by the object. If the signal value of the reflected light is within a preset value range, the object above the fingerprint recognition area may be regarded as a living fingerprint; if the signal value of the reflected light is not within the numerical range, the object above the fingerprint recognition area may be considered It is a non-living fingerprint such as a false fingerprint layer or a fake fingerprint film.
  • the size of the optical signal reflected by the finger can be used to determine whether the fingerprint above the fingerprint identification area is a living fingerprint or a non-living fingerprint, thereby improving the security of the fingerprint password.
  • the upper part of the fingerprint recognition area is a living fingerprint.
  • a part of the light signal emitted by the OLED display panel is absorbed by the tissue layers and blood in the finger, and another part of the light signal is reflected by the finger, and the reflected light passes through the OLED display screen to reach the optical fingerprint sensor.
  • the upper part of the fingerprint recognition area is a non-living fingerprint or a false fingerprint layer.
  • the light signal reflected by the finger includes an optical signal reflected by the fake fingerprint layer and an optical signal reflected by the finger.
  • the false fingerprint layer is located above the fingerprint recognition area, since the reflection coefficient of the fake fingerprint layer is relatively high, the optical signal incident on the finger through the fake fingerprint layer is very weak, so the light signal absorbed by the finger is extremely Less, and the fake fingerprint layer does not have internal tissues and blood, and cannot absorb excessive light signals. Therefore, the reflected light signal collected by the sensor is more than the reflected light signal received in FIG.
  • a range of values can be obtained by sample training, the range of values of the signal value of the reflected light signal when the living fingerprint is located above the fingerprint recognition area, that is, the confidence interval of the reflected light signal corresponding to the living fingerprint.
  • the confidence interval of the reflected light signal corresponding to the living fingerprint may be determined by analyzing different samples in the process of multiple fingerprint recognition.
  • the upper part of the fingerprint recognition area is considered to be a living fingerprint.
  • the numerical interval may be [80 mW, 120 mW]. If the optical power of the reflected light signal detected by the optical fingerprint sensor is 100 mW when the finger is placed over the fingerprint recognition area, and 100 mW is within the numerical range, then the upper part of the fingerprint identification area may be regarded as a living fingerprint; if the sensor detects The optical power of the reflected light signal is 200 mW, and 200 mW outside the numerical interval, it can be considered that the upper side of the fingerprint recognition area is a non-living fingerprint.
  • the range of values can be adjusted periodically or non-periodically depending on factors such as time or environment. For example, when used in different background light environments, different numerical ranges can be preset for live fingerprints and non-living fingerprints. Identification.
  • a confidence interval of the signal value of the reflected light signal corresponding to the non-living fingerprint may be set. If the optical power of the reflected light signal detected by the optical fingerprint sensor is within the numerical range, the fingerprint contacting the fingerprint recognition area is considered to be non- The living fingerprint; if the optical power of the reflected light signal detected by the optical fingerprint sensor is outside the numerical interval, the upper portion of the fingerprint identification area is considered to be a living fingerprint. This application does not limit this.
  • the reflected light signal is detected by an optical fingerprint sensor disposed under the display screen, the optical fingerprint sensor comprising a sensing array having a plurality of optical sensing units.
  • the light emitted by the display screen presents a preset pattern in the fingerprint identification area
  • the detecting the signal value of the reflected light signal generated by the object located above the fingerprint recognition area comprises:
  • At least a part of the optical sensing unit under the fingerprint identification area detects a signal value of the reflected light signal generated by the display screen in which the light emitted by the fingerprint recognition area is reflected on the object.
  • the OLED display screen in the embodiment of the present application may display two patterns in the fingerprint identification area, which are respectively described below.
  • the preset pattern is a ring pattern corresponding to the light emitting area of the fingerprint identification area, and the middle area surrounded by the ring pattern is a non-light emitting area of the fingerprint identification area;
  • the signal value of the reflected light signal generated by detecting the light emitted by the display screen in the fingerprint recognition area is reflected on the object, and includes:
  • An optical sensing unit located under the non-light emitting area detects a signal value of the reflected light signal generated by the display screen in the fingerprint recognition area and the light representing the circular pattern is reflected on the object, wherein the reflected light A signal passes through the display screen in the non-illuminated area and is received by the optical sensing unit.
  • the light emitted by the display screen in the fingerprint recognition area exhibits a circular pattern.
  • the light-emitting area of the fingerprint recognition area is annular, and the circular area surrounded by the annular area is a non-light-emitting area.
  • the optical signal reflected by the object above the fingerprint recognition area is detected by an optical sensing unit located below the non-light emitting area, and the optical sensing unit located below the non-light emitting area collects an optical signal that the object reflects to the non-light emitting area. In this way, the living fingerprint is located on the fingerprint identification area.
  • the signal value of the reflected light signal detected by the optical fingerprint sensor is different from the size of the reflected light signal detected by the optical fingerprint sensor when the non-living fingerprint is located above the fingerprint recognition area, the difference is higher, and the living body is easier to perform. Identification of fingerprints and non-living fingerprints.
  • the preset pattern covers the entire fingerprint identification area
  • the signal value of the reflected light signal generated by detecting the light emitted by the display screen in the fingerprint recognition area is reflected on the object, and includes:
  • All the optical sensing units located under the fingerprint identification area detect a signal value of the reflected light signal generated by the display screen in the fingerprint recognition area and the light covering the entire fingerprint recognition area is reflected on the object, wherein The reflected light signal passes through the display screen in the fingerprint recognition area and is received by the optical sensing unit.
  • the preset pattern formed by the light emitted by the display screen in the fingerprint recognition area covers the entire fingerprint identification area.
  • the entire fingerprint identification area is a light-emitting area.
  • the light emitted by the display screen in the fingerprint recognition area is reflected by the object above the pattern recognition area, wherein the reflected light signal generated by the object is detected by all the optical sensing units below the fingerprint recognition area.
  • a fingerprint image of the object may be acquired to match the fingerprint image with the fingerprint image in the fingerprint database.
  • the embodiment of the present application does not limit the pattern formed by the display screen in the fingerprint recognition area, that is, the shape of the light-emitting area and the non-light-emitting area in the fingerprint recognition area is not limited, and the light-emitting color and the light-light pattern may also be set as needed or changed at any time.
  • the pattern formed by the light emitted by the display screen in the fingerprint recognition area is a ring shape.
  • the annular area in the OLED display can be controlled to emit light, while the circular area in the middle of the annular area does not illuminate.
  • the optical sensing unit below the circular non-light emitting area detects the reflected light signal generated by the object above the fingerprint recognition area. If the optical power value of the reflected optical signal is within a preset optical power range, the object above the fingerprint recognition area is considered to be a living fingerprint, otherwise it is a non-living fingerprint.
  • the preset pattern is further used to indicate a location of the fingerprint identification area in the display screen, so that the user determines the fingerprint identification area according to the preset pattern.
  • the preset pattern is a ring pattern
  • the user can know the position of the ring pattern that is lit, that is, the fingerprint recognition area, so that a finger can be placed on the fingerprint recognition area for fingerprinting. Identification.
  • the method further includes: collecting a fingerprint image according to a reflected light signal generated by the light emitted by the display screen on the object located above the fingerprint recognition area; and determining the image above the fingerprint identification area If the object is a living fingerprint, the fingerprint image is matched with the fingerprint image in the fingerprint library.
  • the matching process of the specific fingerprint image can refer to the existing process of fingerprint recognition. For brevity, no further details are provided here.
  • the sequence between the process of determining whether the upper portion of the fingerprint identification area is a living fingerprint or a non-living fingerprint, the process of collecting the fingerprint image, and the matching process of the fingerprint image is not limited in the present application.
  • the circular pattern formed by the light emitted by the display screen in the fingerprint recognition area is a process of determining whether the contact fingerprint identification area is a living fingerprint or a non-living fingerprint, and during the collection process of the fingerprint image, The illuminating area of the OLED display is different.
  • the OLED display screen In the process of determining whether the upper side of the fingerprint recognition area is a living fingerprint or a non-living fingerprint, the OLED display screen emits light in the annular range of the fingerprint recognition area, and when the fingerprint image is collected, the OLED display screen emits light in the entire fingerprint recognition area.
  • the OLED display may first control the light emitted by the OLED display in the fingerprint recognition area to be circular to identify whether the object above the fingerprint identification area is a living fingerprint or a non-living fingerprint; when the object is identified as a living fingerprint, the OLED display is controlled.
  • the fingerprint identification area is illuminated, so that the fingerprint image of the living fingerprint is collected, and the fingerprint image is matched with the fingerprint image in the fingerprint database to determine whether the fingerprint can successfully unlock the fingerprint password.
  • the unlocking is successful.
  • the OLED display can be controlled to emit light in the entire fingerprint recognition area to collect the fingerprint image of the object located above the fingerprint identification area; after the fingerprint image is collected, the light emitted by the OLED display in the fingerprint recognition area is controlled to be ring-shaped.
  • the object above the fingerprint identification area is identified as a living fingerprint or a non-living fingerprint, and when the fingerprint is a living fingerprint, the collected fingerprint image is matched with the fingerprint image in the fingerprint database, and when the matching is successful, the unlocking is successful.
  • the OLED display screen needs to be controlled to emit light in the entire fingerprint recognition area, and the object above the fingerprint identification area is determined to be a living fingerprint or a non-living fingerprint, and the same is also collected. Fingerprint image of the fingerprint.
  • the OLED display is controlled to illuminate throughout the fingerprint recognition area. While determining whether the object above the fingerprint recognition area is a living fingerprint or a non-living fingerprint, the fingerprint image of the fingerprint may be collected, and when the fingerprint is a living fingerprint, the fingerprint image of the fingerprint and the fingerprint image in the fingerprint database Matching is performed, and when the matching is successful, the unlocking is confirmed to be successful.
  • the OLED display is controlled to illuminate throughout the fingerprint recognition area. First, it is determined whether the object above the fingerprint recognition area is a living fingerprint or a non-living fingerprint, and when the fingerprint is a living fingerprint, the fingerprint image of the fingerprint is collected, and the fingerprint image of the fingerprint is matched with the fingerprint image in the fingerprint database to match Confirm successful unlock when successful.
  • the fingerprint image may be collected and matched in the normal manner according to the usual manner.
  • the fingerprint is determined to be a living fingerprint or a non-living fingerprint.
  • the unlocking is confirmed. success.
  • the size of the sequence numbers of the foregoing processes does not mean the order of execution sequence, and the order of execution of each process should be determined by its function and internal logic, and should not be applied to the embodiment of the present application.
  • the implementation process constitutes any limitation.
  • the fingerprint identification device in the embodiment of the present application may perform the method for fingerprint identification in the embodiment of the present application, and has the function of executing the corresponding method.
  • FIG. 8 shows a schematic block diagram of a fingerprint identification device 800 of an embodiment of the present application.
  • the fingerprint recognition device includes an optical fingerprint sensor 810 and a processor 820. among them:
  • the optical fingerprint sensor 810 is configured to detect a signal value of a reflected light signal generated by an object located above the fingerprint recognition area, where the reflected light signal is generated by reflection of light emitted by the display screen on the object. And the fingerprint identification area is located at at least part of the display area of the display screen;
  • the processor 820 is configured to determine whether a signal value of the reflected optical signal detected by the optical fingerprint sensor is within a preset numerical range, and when a signal value of the reflected optical signal is in the numerical range, Determining that the object above the fingerprint recognition area is a living fingerprint.
  • the size of the optical signal reflected by the finger can be used to determine whether the fingerprint above the fingerprint identification area is a living fingerprint or a non-living fingerprint, thereby improving the security of the fingerprint password.
  • the processor is further configured to: when the signal value of the reflected optical signal exceeds the value range, determine that the object above the fingerprint identification area is a non-living fingerprint.
  • the optical fingerprint sensor is disposed below the display screen, and the optical fingerprint sensor includes a sensing array having a plurality of optical sensing units.
  • the light emitted by the display screen presents a preset pattern in the fingerprint identification area, wherein at least part of the optical sensing unit of the optical fingerprint sensor located below the fingerprint identification area is configured to detect the display A signal value of the reflected light signal generated by the light emitted by the screen in the fingerprint recognition area being reflected on the object.
  • the preset pattern is a ring pattern
  • the ring pattern corresponds to a light-emitting area of the fingerprint recognition area
  • an intermediate area surrounded by the ring pattern is a non-light-emitting area of the fingerprint recognition area
  • the optical sensing unit of the optical fingerprint sensor located under the non-light emitting area is configured to detect that the light emitted by the display screen in the fingerprint recognition area and exhibiting the circular pattern is reflected on the object. Generating a signal value of the reflected light signal, wherein the reflected light signal passes through the display screen in the non-light emitting region and is received by the optical sensing unit.
  • the preset pattern covers the entire fingerprint identification area, wherein all optical sensing units of the optical fingerprint sensor located below the fingerprint identification area are configured to detect that the display screen is sent in the fingerprint identification area a signal value of the reflected light signal generated by the light of the entire fingerprint recognition area being reflected on the object, wherein the reflected light signal passes through the display screen in the fingerprint recognition area and is The optical sensing unit receives.
  • the preset pattern is further used to indicate a location of the fingerprint identification area in the display screen, so that a user determines the fingerprint identification area according to the preset pattern.
  • the optical fingerprint sensor is further configured to: collect a fingerprint image according to a reflected light signal generated by the light emitted from the display screen on the object located above the fingerprint recognition area;
  • the processor is further configured to: when determining that the object above the fingerprint identification area is a living fingerprint, match the fingerprint image with a fingerprint image in a fingerprint library.
  • the processor may be a central processing unit (CPU), and the processor may also be other general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), and off-the-shelf programmable gate arrays ( FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • each step of the above method may be completed by an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the steps of the positioning method disclosed in the embodiments of the present application may be directly implemented as hardware processor execution completion, or use hardware and software module groups in the processor.
  • the execution is completed.
  • the software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.
  • FIG. 9 is a schematic structural diagram of a fingerprint identification chip according to an embodiment of the present application.
  • the fingerprint identification chip 900 of FIG. 9 includes an input interface 901, an output interface 902, at least one processor 903, and a memory 904.
  • the input interface 901, the output interface 902, the processor 903, and the memory 904 communicate with each other through an internal connection path. connection.
  • the processor 903 is configured to execute code in the memory 904.
  • the processor 903 can implement the corresponding operations of the method 300 in the method embodiments when the code is executed. For the sake of brevity, it will not be repeated here.
  • the embodiment of the present application further provides a terminal device, which may include a display screen and any one of the above-mentioned fingerprint recognition devices in the embodiment of the present application, wherein the fingerprint recognition device is disposed below the display screen.
  • the terminal device 900 can implement the corresponding operations of the method 300 in the method embodiment.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated as The components displayed by the unit may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one detecting unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

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Abstract

本申请公开了一种指纹识别的方法、指纹识别装置、指纹识别芯片和终端设备。该方法包括：当指纹识别区域上接收到手指的触摸信号时，检测所述手指反射的光信号的大小；确定所述光信号的大小是否位于预设的数值范围内；若所述光信号的大小位于所述数值范围内，则确定接触所述指纹识别区域的指纹为活体指纹。因此，在手指按压指纹识别区域时，通过该手指反射的光信号的大小，判断接触该指纹识别区域的指纹为活体指纹还是非活体指纹，从而提高了指纹密码的安全性。

Description

指纹识别的方法、装置和终端设备 技术领域
本申请涉及信息技术领域，并且更具体地，涉及一种指纹识别的方法、指纹识别装置和终端设备。
背景技术
利用手指纹路对光的反射差异可以绘出指纹图像，并根据对指纹特征点的判别，在电子设备比如手机上实现指纹识别。但是，对于传统的指纹识别方法来说，指纹识别过程中需要获取指纹图像进行指纹识别，因此，只要通过橡胶、橡皮泥等材料制作假手指或者假指纹模，就能轻易地破解指纹密码，对信息安全和财产安全造成巨大损失。
发明内容
本申请实施例提供了一种指纹识别的方法、装置和终端设备，能够有效地识别出接触指纹识别区域的指纹为活体指纹还是非活体指纹，提高了指纹密码的安全性。
第一方面，提供了一种指纹识别的方法，包括：检测位于指纹识别区域上方的物体产生的反射光信号的信号值，其中，所述反射光信号是由显示屏发出的光线在所述物体上发生反射而产生的，且所述指纹识别区域位于所述显示屏的至少部分显示区域；判断所述反射光信号的信号值是否位于预设的数值范围内；若所述反射光信号的大小位于所述数值范围内，则确定所述指纹识别区域上方的所述物体为活体指纹。
因此，在进行指纹识别时，通过该手指反射的光信号的大小，可以判断该指纹识别区域上方的指纹为活体指纹还是非活体指纹，从而提高了指纹密码的安全性。
在一些可能的实现方式中，所述方法还包括：若所述反射光信号的信号值位于所述数值范围外，则确定所述指纹识别区域上方的所述物体为非活体指纹。
在一些可能的实现方式中，所述反射光信号通过设置在所述显示屏下方 的光学指纹传感器进行检测，所述光学指纹传感器包括具有多个光学感应单元的感应阵列。
在一些可能的实现方式中，所述显示屏发出的光线在所述指纹识别区域呈现预设图案，其中，所述检测位于指纹识别区域上方的物体产生的反射光信号的信号值，包括：所述指纹识别区域下方的至少部分光学感应单元，检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值。
在一些可能的实现方式中，所述预设图案为环形图案，所述环形图案对应于所述指纹识别区域的发光区域，所述环形图案包围的中间区域为所述指纹识别区域的非发光区域；
其中，所述检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值，包括：
位于所述非发光区域下方的光学感应单元，检测所述显示屏在所述指纹识别区域发出的呈现所述环形图案的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述非发光区域穿过所述显示屏并被所述光学感应单元接收。
在一些可能的实现方式中，所述预设图案覆盖整个指纹识别区域，其中，所述检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值，包括：
位于所述指纹识别区域下方的所有光学感应单元，检测所述显示屏在所述指纹识别区域发出的覆盖整个指纹识别区域的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述指纹识别区域穿过所述显示屏并被所述光学感应单元接收。
在一些可能的实现方式中，所述预设图案还用于指示所述指纹识别区域在所述显示屏中的位置，以便于用户根据所述预设图案确定所述指纹识别区域。
在一些可能的实现方式中，所述方法还包括：
根据所述显示屏发出的光线在位于指纹识别区域上方的所述物体上发生反射所产生的反射光信号，进行指纹图像的采集；
若确定所述指纹识别区域上方的所述物体为活体指纹，则将所述指纹图像与指纹库中的指纹图像进行匹配。
第二方面，提供了一种指纹识别装置，所述指纹识别装置包括光学指纹传感器和处理器，其中，所述光学指纹传感器，用于检测位于指纹识别区域上方物体产生的反射光信号的信号值，其中，所述反射光信号是由显示屏发出的光线在所述物体上发生反射而产生的，且所述指纹识别区域位于所述显示屏的至少部分显示区域；所述处理器，用于判断所述光学指纹传感器检测的所述反射光信号的信号值是否位于预设的数值范围内，并且在所述反射光信号的信号值位于所述数值范围时，确定所述指纹识别区域上方的所述物体为活体指纹。
因此，在进行指纹识别时，通过该手指反射的光信号的大小，可以判断该指纹识别区域上方的指纹为活体指纹还是非活体指纹，从而提高了指纹密码的安全性。
在一些可能的实现方式中，所述处理器还用于：在所述反射光信号的信号值超出所述数值范围时，确定所述指纹识别区域上方的所述物体为非活体指纹。
在一些可能的实现方式中，所述光学指纹传感器设置在所述显示屏的下方，且所述光学指纹传感器包括具有多个光学感应单元的感应阵列。
在一些可能的实现方式中，所述显示屏发出的光线在所述指纹识别区域呈现预设图案，其中，所述光学指纹传感器中位于所述指纹识别区域下方的至少部分光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值。
在一些可能的实现方式中，所述预设图案为环形图案，所述环形图案对应于所述指纹识别区域的发光区域，所述环形图案包围的中间区域为所述指纹识别区域的非发光区域；
其中，所述光学指纹传感器中位于所述非发光区域下方的光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的呈现所述环形图案的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述非发光区域穿过所述显示屏并被所述光学感应单元接收。
在一些可能的实现方式中，所述预设图案覆盖整个指纹识别区域，其中，所述光学指纹传感器中位于所述指纹识别区域下方的所有光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的覆盖整个指纹识别区域的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反 射光信号在所述指纹识别区域穿过所述显示屏并被所述光学感应单元接收。
在一些可能的实现方式中，所述预设图案还用于指示所述指纹识别区域在所述显示屏中的位置，以便于用户根据所述预设图案确定所述指纹识别区域。
在一些可能的实现方式中，所述光学指纹传感器还用于，根据在所述显示屏发出的光线在位于指纹识别区域上方的所述物体上发生反射所产生的反射光信号，进行指纹图像的采集；所述处理器还用于，在确定所述指纹识别区域上方的所述物体为活体指纹时，将所述指纹图像与指纹库中的指纹图像进行匹配。
第三方面，提供了一种计算机可读介质，用于存储计算机程序，该计算机程序包括用于执行第一方面或第一方面的任意可能的实现方式中的方法的指令。
第四方面，提供了一种指纹识别芯片，该指纹识别芯片包括上述第二方面或第二方面的任意可能的实现方式中的指纹识别装置。
第五方面，提供了一种终端设备，该终端设备包括上述第二方面或第二方面的任意可能的实现方式中的指纹识别装置。
附图说明
图1是本申请实施例可以适用的终端设备的结构示意图。
图2是本申请一种应用场景的示意图。
图3是根据本申请实施例的指纹识别的方法的示意性流程图。
图4是本申请实施例活体指纹的检测示意图。
图5是本申请实施例非活体指纹的检测示意图。
图6是本申请实施例的一种指纹识别区域的示意图。
图7时本申请实施例的另一种指纹识别区域的示意图。
图8是本申请实施例的指纹识别装置的示意性框图。
图9是本申请实施例的指纹识别芯片的示意性框图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
应理解，本申请实施例可以应用于光学指纹系统，包括但不限于光学指 纹识别系统和基于光学指纹成像的医疗诊断产品等，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成像技术的系统等。
对于传统的指纹识别方法来说，指纹识别过程中需要获取手指的指纹图像，并将该指纹图像与指纹库中的指纹进行匹配，若匹配成功则执行解锁操作。但是，只要通过特殊材料制作与该手指的指纹图像相同的假指纹层，就能轻易地破解指纹密码。市面上常见的可以用来制作假指纹层的材料包括木胶、白胶、硅胶等，另外假指纹层也可以通过油墨打印等方式来得到。
针对上述的假指纹层，本申请实施例在进行指纹识别时，能够基于真活体指纹和假指纹层对光的吸收和反射的特征差异，判断接触指纹识别区域的手指为活体指纹还是假指纹层即非活体指纹，从而提高了指纹密码的安全性。
作为一种常见的应用场景，本申请实施例提供的指纹识别方法、指纹识别装置以及指纹识别芯片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终端设备；更具体地，在上述终端设备中，指纹识别系统可以具体为光学指纹系统，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)光学指纹系统。
如图1所示为本申请实施例可以适用的终端设备的结构示意图，该终端设备100的光学指纹系统包括显示屏120和光学指纹装置130，其中，所述光学指纹装置130设置在所述显示屏120下方的局部区域。所述光学指纹装置130可以具体为光学传感器，其包括具有多个光学感应单元的感应阵列，所述感应阵列所在区域为所述光学指纹装置130的指纹识别区域103。如图1所示，所述指纹识别区域103位于所述显示屏120的显示区域102之中，因此，使用者在需要对所述终端设备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的指纹识别区域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终端设备100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102可以基本扩展到整个终端设备100的正面。
作为一种优选的实施例中，所述显示屏120可以为自发光显示屏，其采用具有自发光显示单元的作为显示像素，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，所述光学指纹装置130可以利用所述OLED显示屏120位于所述指纹识别区域103的OLED显示单元(即OLED光源)来作为光学指纹检测的激励光源。并且，所述光学指纹装置130的感应阵列具体为光探测器(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。当手指触摸、按压或者接近在所述指纹识别区域103时，所述指纹识别区域103的显示单元发出的光线在手指表面的指纹发生反射并形成反射光，其中所述手指指纹的脊和谷的反射光是不同的，反射光从所述显示屏120并被所述光探测器阵列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，从而在所述终端设备100实现光学指纹识别功能。
在其他替代实施例中，所述光学指纹装置130也可以设置在所述显示屏120下方的整个区域，从而将所述指纹识别区域103扩展到整个所述显示屏120的整个显示区域102，实现全屏指纹检测。或者，所述光学指纹装置130也可以设置在所述终端设备100内部的预定区域，比如所述终端设备100的边缘区域，并在所述显示屏120下方设置导光结构来将手指表面的反射光导引到所述光学指纹装置130的感应阵列。
应当理解的是，在具体实现上，所述终端设备100还包括透明保护盖板110，所述盖板110可以具体为透明盖板，比如玻璃盖板或者蓝宝石盖板，其位于所述显示屏120的上方并覆盖所述终端设备100的正面。因为，本申请实施例中，所谓的手指触摸、按压或者接近在所述显示屏120实际上是指手指触摸、按压或者接近在所述显示屏120上方的盖板110或者覆盖所述盖板110的保护层表面。另外，所述终端设备100还可以包括触摸传感器，所述触摸传感器可以具体为触控面板，其可以设置在所述显示屏120表面，也可以部分或者整体集成到所述显示屏120内部，即所述显示屏120具体为触控显示屏。
作为一种可选的实现方式，如图1所示，所述光学指纹装置130包括光检测部分134和光学组件132，所述光检测部分134包括所述感应阵列以及与所述感应阵列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)；所述光学组件132可以设置在所述光检测部分 134的感应阵列的上方，其可以具体包括滤光层(Filter)、导光层以及其他光学元件，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芯片，也可以是作为安装在光学指纹模组内部。其中，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)层或者透镜(Lens)层，其具有多个准直单元或者透镜单元，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，而倾斜入射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，从而所述感应阵列便可以检测出手指的指纹图像。
在所述光学指纹装置130中，每一个准直单元或者透镜单元可以分别对应所述感应阵列的其中一个光学感应单元；可替代地，所述准直器单元或者透镜单元跟所述感应阵列的光学感应单元之间也可以采用非一一对应的关系来降低产生莫尔条纹干扰，比如一个光学感应单元可以对应于多个准直单元或者透镜单元，或者，所述准直单元或者透镜单元也可以采用不规则排列的方式；采用不规则排列的准直单元或者透镜单元可以通过后期软件算法来对每一个感应单元检测到的反射光线进行校正。
图2是本申请提供的指纹识别方法的一种具体应用场景的参考示意图。在图2所示的应用场景中，光学指纹系统包括有机发光二极管(Organic Light Emitting Diode，OLED)显示屏201、以及与OLED显示屏201底部贴合的光学指纹传感器(后面也简称为传感器)202。当该光学指纹系统应用在图1所示的终端设备时，该OLED显示屏201可以相当于图1所示的终端设备的显示屏120，而光学指纹传感器202可以相当于图1所示的终端设备的光学指纹装置130，且指纹识别区域203可以相当于图1中所示的终端设备的指纹识别区域103。
该光学指纹传感器202例如可以包括具有多个光学感应单元的感应阵列例如光电二极管(Photo Diode，PD)阵列，这些感应阵列所在区域即为指纹识别区域203。如图2所示，指纹识别区域203位于OLED显示屏的部分显示区域。在指纹识别的过程中，手指可以触摸或者按压该指纹识别区域 103，以实现指纹驶入。
在进行指纹识别时，OLED显示屏201发光，当手指按压在指纹识别区域203时，光经过OLED显示屏201和该手指后反射进入传感器202，传感器202根据接收到的反射光，可以判断接触指纹识别区域203的指纹为活体指纹还是非活体指纹。
由于所述光学指纹系统采用光学方式来实现指纹感应信号检测，在其他替代实施例中，当用户的手指接近但尚未触摸或者按压所述指纹识别区域203时，所述OLED显示屏201发出的光线也可以在手指表面发生反射，并且相对应地反射光也可以返回并穿过所述OLED显示屏201进入所述光学指纹传感器202。也即是说，只要手指位于所述指纹识别区域203的上方，所述光学指纹系统便可以进行光学指纹采集以及后续的指纹识别操作。
图3示出了根据本申请实施例的指纹识别的方法300的示意性流程图，该方法300可以由指纹识别装置执行，该指纹识别装置例如可以包括图1中所示的光学指纹装置130或者包括图2所示的光学指纹传感器202，该指纹识别装置可以位于显示屏的指纹识别区域的下方。具体地，本申请实施例中的指纹识别装置可以为指纹识别芯片，该指纹识别芯片可以为按压式指纹识别芯片、刮擦式指纹识别芯片或触摸式指纹识别芯片等，本申请实施例并不限于此。该指纹识别装置可以位于终端设备中。
应理解，本申请实施例中的终端设备可以为手机、平板电脑、笔记本电脑等安装有指纹识别装置的电子设备，例如可以为安装有指纹识别芯片的手机。
具体地，该方法300可以包括：
在310中，检测位于指纹识别区域上方的物体产生的反射光信号的信号值，其中，该反射光信号是由显示屏发出的光线在该物体上发生反射而产生的，且该指纹识别区域位于该显示屏的至少部分显示区域。
在320中，判断该反射光信号的信号值是否位于预设的数值范围内。
在330中，若该反射光信号的大小位于该数值范围内，则确定该指纹识别区域上方的该物体为活体指纹。
可选地，该方法还包括：若该反射光信号的信号值位于该数值范围外，则确定该指纹识别区域上方的该物体为非活体指纹。
具体地，用于进行指纹检测的指纹识别区域位于显示屏的至少部分显示 区域，待进行指纹识别的物体位于指纹识别区域的上方，显示屏发出的光线入射至指纹识别区域上方的物体时，该物体产生的反射光信号经过显示屏到达光学指纹传感器，光学指纹传感器检测该物体产生的该反射光信号的信号值。如果该反射光的信号值位于预设的数值范围内，则可以认为指纹识别区域上方的物体为活体指纹；如果该反射光的信号值不在该数值范围内，则可以认为指纹识别区域上方的物体为非活体指纹例如假指纹层或假指纹膜。
因此，本申请实施例中，在进行指纹识别时，通过该手指反射的光信号的大小，可以判断该指纹识别区域上方的指纹为活体指纹还是非活体指纹，从而提高了指纹密码的安全性。
例如图4所示，手指直接放在指纹识别区域上方时，指纹识别区域的上方为活体指纹。OLED显示屏发出的一部分光信号会被手指中的各组织层和血液会吸收，而另一部分光信号会被该手指反射，反射光穿过OLED显示屏到达光学指纹传感器。
而如果在手指上贴附假指纹层后再放在压指纹识别区域的上方，那么指纹识别区域的上方为非活体指纹即假指纹层。这时，该手指反射的光信号包括假指纹层反射的光信号和该手指反射的光信号。例如图5所示，假指纹层位于指纹识别区域的上方时，由于假指纹层的反射系数较高，经过该假指纹层入射至该手指的光信号十分微弱，因此该手指吸收的光信号极少，且该假指纹层并不具有内部组织和血液，也无法吸收过多的光信号。因此传感器采集到的反射光信号就比图4中接收到的反射光信号多。
可以通过样本训练得到一个数值范围，该数值范围为活体指纹位于指纹识别区域上方时该反射光信号的信号值的范围，即活体指纹对应的反射光信号的置信区间。可以在多次指纹识别的过程中，通过对不同样本进行分析，确定活体指纹对应的反射光信号的该置信区间。
在指纹识别过程中，如果手指放在指纹识别区域上方时光学指纹传感器检测到的反射光信号的信号值在该置信区间内，则认为该指纹识别区域的上方为活体指纹。例如，该数值区间可以为[80mW，120mW]。如果手指放在指纹识别区域上方时光学指纹传感器检测到的反射光信号的光功率为100mW，而100mW在该数值范围内，那么可以认为该指纹识别区域的上方为活体指纹；如果传感器检测到的反射光信号的光功率为200mW，而200mW在在该数值区间之外，则可以认为该指纹识别区域的上方为非活体指纹。
该数值范围可以随时间或环境等因素的不同进行周期性的或非周期性的调整，例如在不同背景光强环境下使用时，可以预设不同的数值范围用来进行活体指纹和非活体指纹的识别。
当然，也可以设置非活体指纹对应的反射光信号的信号值的置信区间，如果光学指纹传感器检测到的反射光信号的光功率在该数值范围内，则认为接触该指纹识别区域的指纹为非活体指纹；如果光学指纹传感器检测到的反射光信号的光功率在该数值区间之外，则认为该指纹识别区域的上方为活体指纹。本申请对此不作限定。
可选地，该反射光信号通过设置在该显示屏下方的光学指纹传感器进行检测，该光学指纹传感器包括具有多个光学感应单元的感应阵列。
进一步地，可选地，该显示屏发出的光线在该指纹识别区域呈现预设图案，其中，在310中，该检测位于指纹识别区域上方的物体产生的反射光信号的信号值，包括：
该指纹识别区域下方的至少部分光学感应单元，检测该显示屏在该指纹识别区域发出的光线在该物体上发生反射所产生的该反射光信号的信号值。
本申请实施例中的OLED显示屏在指纹识别区域显示的图案可以有两种，下面分别描述。
图案1
可选地，该预设图案为环形图案，该环形图案对应于该指纹识别区域的发光区域，该环形图案包围的中间区域为该指纹识别区域的非发光区域；
其中，在330中，该检测该显示屏在该指纹识别区域发出的光线在该物体上发生反射所产生的该反射光信号的信号值，包括：
位于该非发光区域下方的光学感应单元，检测该显示屏在该指纹识别区域发出的呈现该环形图案的光线在该物体上发生反射所产生的该反射光信号的信号值，其中，该反射光信号在该非发光区域穿过该显示屏并被该光学感应单元接收。
该实施例中，该显示屏在该指纹识别区域发出的光线呈现环形图案，例如图6所示，该指纹识别区域的发光区域为环形，而该环形区域包围的圆形区域为非发光区域，指纹识别区域上方的物体反射的光信号是由位于非发光区域下方的光学感应单元来检测的，位于非发光区域下方的光学感应单元采集该物体反射至非发光区域的光信号。这样，活体指纹位于指纹识别区域上 方时光学指纹传感器检测的反射光信号的信号值，与非活体指纹位于指纹识别区域上方时光学指纹传感器检测的反射光信号的大小之间相差会比较大，区分度较高，更加容易进行活体指纹和非活体指纹的识别。
图案2
可选地，该预设图案覆盖整个指纹识别区域；
其中，在310中，该检测该显示屏在该指纹识别区域发出的光线在该物体上发生反射所产生的该反射光信号的信号值，包括：
位于该指纹识别区域下方的所有光学感应单元，检测该显示屏在该指纹识别区域发出的覆盖整个指纹识别区域的光线在该物体上发生反射所产生的该反射光信号的信号值，其中，该反射光信号在该指纹识别区域穿过该显示屏并被该光学感应单元接收。
该实施例中，显示屏在指纹识别区域发出的光线形成的该预设图案覆盖整个指纹识别区域，例如图7所示，整个指纹识别区域均为发光区域。显示屏在指纹识别区域发出的光线，被纹识别区域上方的物体反射，其中，该物体产生的反射光信号是由指纹识别区域下方的所有光学感应单元来检测的。这样，判断该指纹识别区域上方的物体为活体指纹还是非活体指纹的同时，还可以获取该物体的指纹图像，以将该指纹图像与指纹库中的指纹图像进行匹配。
本申请实施例对显示屏在指纹识别区域形成的图案不作限定，即对指纹识别区域中的发光区域和非发光区域的形状不作限定，发光颜色和亮光图案也可以根据需要设置或者随时改变。例如图6所示，显示屏在指纹识别区域发出的光线形成的图案为环形。可以控制OLED显示屏中的该环形区域发光，而该环形区域中间的圆形区域不发光。进行指纹识别时，圆形非发光区域下方的光学感应单元检测指纹识别区域上方的物体产生的反射光信号。如果该反射光信号的光功率值在预设的光功率的范围内，则认为指纹识别区域上方的物体为活体指纹，否则为非活体指纹。
可选地，该预设图案还用于指示该指纹识别区域在该显示屏中的位置，以便于用户根据该预设图案确定该指纹识别区域。
例如，若该预设图案为环形图案，该环形区域亮起时，则用户可以知道亮起的该环形图案的位置，即为指纹识别区域，从而可以将手指放在该指纹识别区域上进行指纹识别。
可选地，该方法还包括：根据该显示屏发出的光线在位于指纹识别区域上方的该物体上发生反射所产生的反射光信号，进行指纹图像的采集；若确定该指纹识别区域上方的该物体为活体指纹，则将该指纹图像与指纹库中的指纹图像进行匹配。
具体的指纹图像的匹配过程可以参考现有的指纹识别的过程，为了简洁，这里不再赘述。
应理解，判断指纹识别区域的上方为活体指纹还是非活体指纹的过程、指纹图像的采集过程、以及指纹图像的匹配过程之间的先后顺序，在本申请中不作限定。
对于图案1的指纹识别区域来说，显示屏在指纹识别区域发出的光线形成的环形图案，在判断接触指纹识别区域的上方为活体指纹还是非活体指纹的过程，与指纹图像的采集过程中，OLED显示屏的发光区域是不同的。判断指纹识别区域的上方为活体指纹还是非活体指纹的过程中，OLED显示屏在指纹识别区域的该环形范围内发光，而指纹图像采集时，OLED显示屏在整个指纹识别区域都发光。
例如，可以先控制OLED显示屏在指纹识别区域发出的光线呈环形，以识别该指纹识别区域上方的物体为活体指纹还是非活体指纹；当识别该物体为活体指纹时，再控制OLED显示屏在整个指纹识别区域均发光，从而采集该活体指纹的指纹图像，并将该指纹图像与指纹库中的指纹图像进行匹配，以确定该指纹是否能够成功解锁指纹密码，匹配成功时确认解锁成功。
又例如，可以先控制OLED显示屏在整个指纹识别区域均发光，以采集位于指纹识别区域上方的物体的指纹图像；采集完指纹图像后，控制OLED显示屏在指纹识别区域发出的光线呈环形，以识别该指纹识别区域上方的物体为活体指纹还是非活体指纹，并在该指纹为活体指纹时，将采集的指纹图像与指纹库中的指纹图像进行匹配，匹配成功时确认解锁成功。
而对于类型2的指纹识别区域来说，只需要控制OLED显示屏中在整个指纹识别区域都发光，就可以在判断指纹识别区域上方的物体为活体指纹还是非活体指纹的同时，也采集到该指纹的指纹图像。
例如，控制OLED显示屏在整个指纹识别区域发光。在判断指纹识别区域上方的物体为活体指纹还是非活体指纹的同时，可以采集该指纹的指纹图像，并在该指纹为活体指纹时，将该指纹的指纹图像与指纹库中的指纹图像 进行匹配，匹配成功时确认解锁成功。
又例如，控制OLED显示屏在整个指纹识别区域发光。先判断指纹识别区域上方的物体为活体指纹还是非活体指纹，并在该指纹为活体指纹时，采集该指纹的指纹图像，并将该指纹的指纹图像与指纹库中的指纹图像进行匹配，匹配成功时确认解锁成功。
又例如，可以先按照通常的方式，对指纹识别区域上方的物体进行指纹图像的采集和匹配，匹配成功时，判断该指纹为活体指纹还是非活体指纹，当该指纹为活体指纹时，确认解锁成功。
应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
上文详细描述了本申请实施例的指纹识别的方法，下面将描述本申请实施例的指纹识别装置。
应理解，本申请实施例中的指纹识别装置可以执行本申请实施例中的指纹识别的方法，具有执行相应方法的功能。
图8示出了本申请实施例的指纹识别装置800的示意性框图。如图8所示，该指纹识别装置包括光学指纹传感器810和处理器820。其中：
所述光学指纹传感器810，用于检测位于指纹识别区域上方物体产生的反射光信号的信号值，其中，所述反射光信号是由显示屏发出的光线在所述物体上发生反射而产生的，且所述指纹识别区域位于所述显示屏的至少部分显示区域；
所述处理器820，用于判断所述光学指纹传感器检测的所述反射光信号的信号值是否位于预设的数值范围内，并且在所述反射光信号的信号值位于所述数值范围时，确定所述指纹识别区域上方的所述物体为活体指纹。
因此，在进行指纹识别时，通过该手指反射的光信号的大小，可以判断该指纹识别区域上方的指纹为活体指纹还是非活体指纹，从而提高了指纹密码的安全性。
可选地，所述处理器还用于：在所述反射光信号的信号值超出所述数值范围时，确定所述指纹识别区域上方的所述物体为非活体指纹。
可选地，所述光学指纹传感器设置在所述显示屏的下方，且所述光学指纹传感器包括具有多个光学感应单元的感应阵列。
可选地，所述显示屏发出的光线在所述指纹识别区域呈现预设图案，其中，所述光学指纹传感器中位于所述指纹识别区域下方的至少部分光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值。
可选地，所述预设图案为环形图案，所述环形图案对应于所述指纹识别区域的发光区域，所述环形图案包围的中间区域为所述指纹识别区域的非发光区域；
其中，所述光学指纹传感器中位于所述非发光区域下方的光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的呈现所述环形图案的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述非发光区域穿过所述显示屏并被所述光学感应单元接收。
可选地，所述预设图案覆盖整个指纹识别区域，其中，所述光学指纹传感器中位于所述指纹识别区域下方的所有光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的覆盖整个指纹识别区域的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述指纹识别区域穿过所述显示屏并被所述光学感应单元接收。
可选地，所述预设图案还用于指示所述指纹识别区域在所述显示屏中的位置，以便于用户根据所述预设图案确定所述指纹识别区域。
可选地，所述光学指纹传感器还用于，根据在所述显示屏发出的光线在位于指纹识别区域上方的所述物体上发生反射所产生的反射光信号，进行指纹图像的采集；
所述处理器还用于，在确定所述指纹识别区域上方的所述物体为活体指纹时，将所述指纹图像与指纹库中的指纹图像进行匹配。
其中，该处理器可以是中央处理单元(Central Processing Unit，CPU)，该处理器还可以是其他通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现成可编程门阵列(FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。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。
在实现过程中，上述方法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。结合本申请实施例所公开的定位方法的步骤可以直接体现为硬件处理器执行完成，或者用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。为避免重复，这里不再详细描述。
图9是本申请实施例的指纹识别芯片的一个示意性结构图。图9的指纹识别芯片900包括输入接口901、输出接口902、至少一个处理器903、存储器904，所述输入接口901、输出接口902、所述处理器903以及存储器904之间通过内部连接通路互相连接。所述处理器903用于执行所述存储器904中的代码。
可选地，当所述代码被执行时，所述处理器903可以实现方法实施例中的方法300的相应操作。为了简洁，这里不再赘述。
本申请实施例还提供了一种终端设备，该终端设备可以包括显示屏和上述本申请实施例中的任意一种指纹识别装置，其中，所述指纹识别装置设置在所述显示屏的下方。该终端设备900能够实现方法实施例中的方法300的相应操作。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，该单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
该作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为 单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个检测单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
以上，仅为本申请的具体实施方式，但本申请实施例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实施例揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请适合私利的保护范围之内。因此，本申请实施例的保护范围应该以权利要求的保护范围为准。

Claims (18)

  1. 一种指纹识别的方法，其特征在于，所述方法包括：
    检测位于指纹识别区域上方的物体产生的反射光信号的信号值，其中，所述反射光信号是由显示屏发出的光线在所述物体上发生反射而产生的，且所述指纹识别区域位于所述显示屏的至少部分显示区域；
    判断所述反射光信号的信号值是否位于预设的数值范围内；
    若所述反射光信号的大小位于所述数值范围内，则确定所述指纹识别区域上方的所述物体为活体指纹。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    若所述反射光信号的信号值位于所述数值范围外，则确定所述指纹识别区域上方的所述物体为非活体指纹。
  3. 根据权利要求1或2所述的方法，其特征在于，所述反射光信号通过设置在所述显示屏下方的光学指纹传感器进行检测，所述光学指纹传感器包括具有多个光学感应单元的感应阵列。
  4. 根据权利要求3所述的方法，其特征在于，所述显示屏发出的光线在所述指纹识别区域呈现预设图案，其中，所述检测位于指纹识别区域上方的物体产生的反射光信号的信号值，包括：
    所述指纹识别区域下方的至少部分光学感应单元，检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值。
  5. 根据权利要求4所述的方法，其特征在于，所述预设图案为环形图案，所述环形图案对应于所述指纹识别区域的发光区域，所述环形图案包围的中间区域为所述指纹识别区域的非发光区域；
    其中，所述检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值，包括：
    位于所述非发光区域下方的光学感应单元，检测所述显示屏在所述指纹识别区域发出的呈现所述环形图案的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述非发光区域穿过所述显示屏并被所述光学感应单元接收。
  6. 根据权利要求4所述的方法，其特征在于，所述预设图案覆盖整个指纹识别区域，
    其中，所述检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值，包括：
    位于所述指纹识别区域下方的所有光学感应单元，检测所述显示屏在所述指纹识别区域发出的覆盖整个指纹识别区域的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述指纹识别区域穿过所述显示屏并被所述光学感应单元接收。
  7. 根据权利要求4至6中任一项所述的方法，其特征在于，所述预设图案还用于指示所述指纹识别区域在所述显示屏中的位置，以便于用户根据所述预设图案确定所述指纹识别区域。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述方法还包括：
    根据所述显示屏发出的光线在位于指纹识别区域上方的所述物体上发生反射所产生的反射光信号，进行指纹图像的采集；
    若确定所述指纹识别区域上方的所述物体为活体指纹，则将所述指纹图像与指纹库中的指纹图像进行匹配。
  9. 一种指纹识别装置，其特征在于，所述指纹识别装置包括光学指纹传感器和处理器，其中，
    所述光学指纹传感器，用于检测位于指纹识别区域上方物体产生的反射光信号的信号值，其中，所述反射光信号是由显示屏发出的光线在所述物体上发生反射而产生的，且所述指纹识别区域位于所述显示屏的至少部分显示区域；
    所述处理器，用于判断所述光学指纹传感器检测的所述反射光信号的信号值是否位于预设的数值范围内，并且在所述反射光信号的信号值位于所述数值范围时，确定所述指纹识别区域上方的所述物体为活体指纹。
  10. 根据权利要求9所述的指纹识别装置，其特征在于，所述处理器还用于：
    在所述反射光信号的信号值超出所述数值范围时，确定所述指纹识别区域上方的所述物体为非活体指纹。
  11. 根据权利要求9或10所述的指纹识别装置，其特征在于，所述光学指纹传感器设置在所述显示屏的下方，且所述光学指纹传感器包括具有多个光学感应单元的感应阵列。
  12. 根据权利要求11所述的指纹识别装置，其特征在于，所述显示屏发出的光线在所述指纹识别区域呈现预设图案，其中，所述光学指纹传感器中位于所述指纹识别区域下方的至少部分光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的光线在所述物体上发生反射所产生的所述反射光信号的信号值。
  13. 根据权利要求12所述的指纹识别装置，其特征在于，所述预设图案为环形图案，所述环形图案对应于所述指纹识别区域的发光区域，所述环形图案包围的中间区域为所述指纹识别区域的非发光区域；
    其中，所述光学指纹传感器中位于所述非发光区域下方的光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的呈现所述环形图案的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述非发光区域穿过所述显示屏并被所述光学感应单元接收。
  14. 根据权利要求12所述的指纹识别装置，其特征在于，所述预设图案覆盖整个指纹识别区域，
    其中，所述光学指纹传感器中位于所述指纹识别区域下方的所有光学感应单元，用于检测所述显示屏在所述指纹识别区域发出的覆盖整个指纹识别区域的光线在所述物体上发生反射所产生的所述反射光信号的信号值，其中，所述反射光信号在所述指纹识别区域穿过所述显示屏并被所述光学感应单元接收。
  15. 根据权利要求12至14中任一项所述的指纹识别装置，其特征在于，所述预设图案还用于指示所述指纹识别区域在所述显示屏中的位置，以便于用户根据所述预设图案确定所述指纹识别区域。
  16. 根据权利要求9至15中任一项所述的指纹识别装置，其特征在于，
    所述光学指纹传感器还用于，根据在所述显示屏发出的光线在位于指纹识别区域上方的所述物体上发生反射所产生的反射光信号，进行指纹图像的采集；
    所述处理器还用于，在确定所述指纹识别区域上方的所述物体为活体指纹时，将所述指纹图像与指纹库中的指纹图像进行匹配。
  17. 一种指纹识别芯片，其特征在于，包括如权利要求9至16中任一项所述的指纹识别装置。
  18. 一种终端设备，其特征在于，包括显示屏和如权利要求9至17中 任一项所述的指纹识别装置，其中，所述指纹识别装置设置在所述显示屏的下方。
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