WO2020024220A1 - 屏下生物特征识别装置和电子设备 - Google Patents

屏下生物特征识别装置和电子设备 Download PDF

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Publication number
WO2020024220A1
WO2020024220A1 PCT/CN2018/098329 CN2018098329W WO2020024220A1 WO 2020024220 A1 WO2020024220 A1 WO 2020024220A1 CN 2018098329 W CN2018098329 W CN 2018098329W WO 2020024220 A1 WO2020024220 A1 WO 2020024220A1
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WO
WIPO (PCT)
Prior art keywords
under
lens
screen
identification device
biometric identification
Prior art date
Application number
PCT/CN2018/098329
Other languages
English (en)
French (fr)
Inventor
郭益平
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 CN202010656857.4A priority Critical patent/CN111767890B/zh
Priority to EP18913995.9A priority patent/EP3623921B1/en
Priority to PCT/CN2018/098329 priority patent/WO2020024220A1/zh
Priority to CN201880001184.XA priority patent/CN109074491B/zh
Priority to US16/658,055 priority patent/US10963667B2/en
Publication of WO2020024220A1 publication Critical patent/WO2020024220A1/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
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F21/00—Security arrangements for protecting computers, components thereof, programs or data against unauthorised activity
    • G06F21/30—Authentication, i.e. establishing the identity or authorisation of security principals
    • G06F21/31—User authentication
    • G06F21/32—User authentication using biometric data, e.g. fingerprints, iris scans or voiceprints
    • 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
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • 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
    • G06V40/1329—Protecting the fingerprint sensor against damage caused by the finger
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73251—Location after the connecting process on different surfaces
    • H01L2224/73265—Layer and wire connectors

Definitions

  • Embodiments of the present invention relate to the field of biometric identification, and more particularly, to an under-screen biometric identification device and an electronic device.
  • biometric technology is receiving more and more attention, and more convenient under-screen biometric recognition technology, such as under-screen fingerprint recognition technology. Practicality has become what the public needs.
  • the under-screen optical fingerprint recognition technology mainly includes an under-screen optical fingerprint recognition technology based on a periodic microwell array and an integrated micro-lens under-screen optical fingerprint recognition technology.
  • the former optical fingerprint recognition technology is susceptible to Moire fringes, and the optical fingerprint recognition module needs to be attached under the OLED screen, and the process is complicated.
  • the fingerprint recognition module of the latter type of under-screen optical fingerprint recognition technology is integrated, which requires very high precision for the entire optical fingerprint recognition module during mass production, and the general processing technology cannot meet the actual requirements. Due to the above-mentioned various problems, the efficiency of biometric recognition under the screen is affected.
  • an under-screen biometric identification device and an electronic device, which can improve the efficiency of under-screen biometric identification.
  • an under-screen biometric identification device including:
  • the lens is disposed below the display screen and is used to receive a light signal formed by reflection of a human finger from above the display screen, and the light signal is used to detect biometric information of the finger;
  • a lens barrel, the lens is fixed in the lens barrel
  • a sensor chip which is arranged below the lens barrel, and the sensor chip is used for imaging based on a light signal passing through the lens, wherein a photosensitive surface of the sensor chip and the The distance between the imaging surfaces of the lens is greater than or equal to a preset value.
  • the imaging surface of the lens is located above or below the photosensitive surface of the sensor chip.
  • the preset value is 10 ⁇ m.
  • the lens includes a lens composed of at least one aspherical injection-molded lens.
  • the lens is a macro lens.
  • the focal length range of the macro lens is 0.4 to 1.8 mm.
  • the lower surface of the lens barrel extends downward at the mouth of the lens barrel to form a first fixing structure, and the lower surface of the lens barrel extends downward at the edge of the lens barrel.
  • a second fixed structure is formed, the lens barrel forms a cavity between the first fixed structure and the second fixed structure, and the lens is fixed in the first fixed structure.
  • the upper surface of the first fixing structure extends inwardly at the mouth of the lens barrel to form a first convex structure, and the first convex structure is used to fix the lens.
  • the upper surface of the first fixing structure is formed with a chamfer at a mouth of the barrel, so that an inner diameter of the first fixing structure at the upper surface is larger than that of the first fixing structure.
  • An inner diameter of the first raised structure is formed with a chamfer at a mouth of the barrel, so that an inner diameter of the first fixing structure at the upper surface is larger than that of the first fixing structure.
  • an inner surface of the first fixing structure is formed with a first step structure below the first convex structure, and the lens passes through the first convex structure and the first The step structure is fixed in the first fixing structure.
  • the under-screen biometric identification device further includes:
  • An optical filter is located between the lens barrel and the sensor chip, wherein the optical filter is fixed on the upper surface of the sensor chip and at least covers the lens by directly contacting the bottom of the lens tube. A lower surface of the first fixing structure.
  • the under-screen biometric identification device further includes:
  • a flexible printed circuit board, the sensor chip is fixed on the upper surface of the flexible printed circuit board, a lower surface of the second fixed structure and an upper surface of the flexible printed circuit board are on the sensor chip
  • the edge area is fixedly connected.
  • the lens barrel is sealed and adhered by fixing glue on the flexible printed circuit board.
  • the lens barrel is formed with an exhaust hole, and the exhaust hole is used to adjust an air pressure intensity of an internal space formed by the lens barrel and the flexible printed circuit board.
  • the under-screen biometric identification device further includes:
  • a fixing frame, the lens barrel is fixed below the display screen through the fixing frame, and a distance between an upper surface of the display screen and an optical center of the lens satisfies an imaging condition.
  • the fixing frame and the lens barrel are installed and fixed by at least one of the following installation methods: a screw installation and fixing method, an adhesive material fixing method, a welding fixing method, and a coupling fixing method. .
  • the under-screen biometric identification device further includes:
  • a mirror base for supporting the lens barrel.
  • a point glue structure is formed between the lens base and the lens barrel, and the lens base and the lens barrel are formed by dispensing in the dispensing structure. fixed.
  • the dispensing structure includes a second step structure formed by an upper surface of the lens holder extending downwardly near a peripheral area of the lens barrel.
  • a lower surface of the lens holder extends downwardly near a peripheral area of the lens barrel to form a third fixing structure surrounding the lens barrel, and a bottom of the third fixing structure is located at Floating state.
  • the lower surface of the lens holder extends downward at the edge of the lens holder away from the lens barrel to form a fourth fixing structure, wherein the height of the lower extension of the fourth fixing structure is greater than A descending height of the third fixed structure.
  • the upper surface of the lens barrel extends inwardly at the mouth of the barrel to form a second convex structure, and the second convex structure is used to fix the lens.
  • the upper surface of the lens barrel is formed with a chamfer at a mouth of the barrel, so that an inner diameter of the lens barrel at the upper surface is larger than that of the lens barrel at the second protrusion. Inside diameter at the structure.
  • a third stepped structure is formed on an inner surface of the lens barrel below the second raised structure, and the lens passes the second raised structure and the third stepped structure. It is fixed in the lens barrel.
  • the under-screen biometric identification device further includes:
  • An optical filter is located between the lens barrel and the sensor chip, wherein the optical filter is fixed on the upper surface of the sensor chip and at least covers the lens by directly contacting the bottom of the lens tube. The lower surface of the lens barrel.
  • the under-screen biometric identification device further includes:
  • a flexible printed circuit board, the sensor chip is fixed on the upper surface of the flexible printed circuit board, and the lower surface of the lens holder and the upper surface of the flexible printed circuit board are on the edge of the sensor chip Areas are permanently connected.
  • the under-screen biometric identification device further includes:
  • the lens mount is sealed and adhered by fixing glue on the flexible printed circuit board.
  • the lens holder is formed with an exhaust hole, and the exhaust hole is used to adjust an air pressure intensity of an internal space formed by the lens holder and the flexible printed circuit board.
  • the under-screen biometric identification device further includes:
  • a fixing frame wherein the lens mount is fixed below the display screen through the fixing frame, and a distance between an upper surface of the display screen and an optical center of the lens satisfies an imaging condition.
  • the fixing frame and the lens mount are fixed by at least one of the following mounting methods: a screw mounting fixing method, a glue-fit fixing method, a welding fixing method, and a coupling fixing method. .
  • the sensor chip is fixed on the upper surface of the flexible printed circuit board by a die-cast adhesive, and the sensor chip is electrically connected to the flexible printed circuit board by a bonding wire.
  • the fixing glue has at least one of the following characteristics: impervious to visible light, having a thickness of 0.02 mm to 0.10 mm, a viscosity of more than 20,000 mPas, and a curing shrinkage of less than 3%.
  • the fixing glue is an epoxy system or an acrylic system.
  • the optical filter is an infrared cut-off optical filter and / or a blue light cut-off optical filter.
  • the optical filter is fixed on the sensing chip through an optical adhesive.
  • the under-screen biometric identification device is applied to an electronic device, and the fixing frame is a middle frame of the electronic device, and the middle frame is used to support the display screen.
  • the middle frame is formed with an opening
  • the lens barrel is at least partially accommodated in the opening
  • a gap exists between the outside of the lens barrel and the inside of the opening.
  • the upper surface of the middle frame is formed with a bevel at the edge of the opening through chamfering, and the bevel makes the width of the opening on the upper surface of the middle frame larger than the middle frame Opening width of the lower surface.
  • an electronic device including:
  • the under-screen biometric identification device according to the first aspect.
  • the electronic device further includes:
  • a display screen, the under-screen biometric identification device is disposed below the display screen, and a distance between an upper surface of the display screen and an optical center of a lens in the under-screen biometric identification device satisfies a predetermined
  • the imaging conditions of the present invention wherein a biometric acquisition area of the under-screen biometric identification device is at least partially located in a display area of the display screen.
  • the electronic device further includes: a middle frame, and the under-screen biometric identification device is assembled below the display screen through the middle frame, so that the under-screen biometric identification device There is a gap with the display screen.
  • the electronic device further includes a flexible circuit board of a screen assembly, the flexible circuit board of the screen assembly is located between the display screen and the middle frame, and the flexible circuit board of the screen assembly and the The middle frames are sealed and fixed by compressible foam with at least one side backed up.
  • the adhesive of the foam and the screen module flexible circuit board is weaker than the foam and the middle frame. Sticky glue.
  • the compression ratio of the foam is> 50%.
  • the distance between the sensing surface of the sensor chip and the imaging surface of the lens is greater than or equal to a preset value, that is, the sensitivity of the sensor chip
  • the surface can be in a defocused state, thereby achieving the desired optical imaging, thereby reducing the requirements on the processing technology, and also solving the batch yield problem of the integrated module in the production and assembly process and the integrated module.
  • the under-screen biometric identification device needs to be set under the display, specifically, the lens is set under the display. Effectively simplifies the installation process of the biometric identification device under the screen, improves the batch yield during the installation of the biometric identification device under the screen, reduces the damage rate during the replacement of the biometric identification device under the screen, and further Effectively reduced costs.
  • FIG. 1 is a schematic plan view of a mobile terminal to which the present application is applicable.
  • FIG. 2 is a schematic partial cross-sectional view of the mobile terminal shown in FIG. 1.
  • FIG. 3 is a partial cross-sectional structure diagram of an under-screen biometric identification device 200 provided in the present application.
  • FIG. 4 is a schematic diagram of the imaging surface of the lens 210 located above the photosensitive surface of the sensor chip 230 in the embodiment of the present application.
  • FIG. 5 is a schematic diagram of the imaging surface of the lens 210 located below the photosensitive surface of the sensor chip 230 in the embodiment of the present application.
  • FIG. 6 is a partial cross-sectional structure diagram of another under-screen biometric identification device 200 provided in the present application.
  • FIG. 7 is a partial cross-sectional structure diagram of an optical filter and a printed circuit board in an under-screen biometric identification device according to an embodiment of the present application.
  • FIG. 8 is a partial cross-sectional structure diagram of an optical filter and a printed circuit board in another under-screen biometric identification device according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a fixing frame in an under-screen biometric recognition device according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of a fixing frame in another under-screen biometric identification device according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of fixing the on-screen biometric identification device 200 below the display screen 320 through a middle frame 370 according to an embodiment of the present application.
  • FIG. 12 is a schematic diagram of an assembly process of the under-screen biometric identification device 200 according to the embodiment of the present application.
  • the under-screen biometric recognition technology refers to the installation of an under-screen biometric identification device (such as a fingerprint recognition module) under the display screen, so as to realize the biometric identification operation in the display area of the display screen, without the need to remove the front of the electronic device.
  • the area outside the display area sets the biometric collection area.
  • the under-screen biometric recognition technology may include an under-screen optical biometric recognition technology, an under-screen ultrasound biometric recognition technology, or other types of under-screen biometric recognition technology.
  • the under-screen optical biometric recognition technology uses light returned from the top surface of the device display component for fingerprint sensing and other sensing operations.
  • the returned light carries information of an object (such as a finger) in contact with the top surface, and a specific optical sensor module located below a display screen is realized by capturing and detecting the returned light.
  • the design of the specific optical sensor module may be to achieve a desired optical imaging by appropriately configuring optical elements for capturing and detecting the returned light.
  • biometric identification in addition to fingerprint identification, the technical solutions of the embodiments of the present application can also perform other biometric identification, such as biometric identification, which is not limited in the embodiments of the present application.
  • FIG. 1 and 2 are schematic diagrams of an electronic device 100 to which an in-screen biometric identification device can be applied, wherein FIG. 1 is a front schematic diagram of an electronic device 100 to which an under-screen biometric identification device can be applied, and FIG. 2 is an illustration of FIG. 1 Partial cross-sectional structure of the electronic device 100 along A'-A '.
  • the electronic device 100 may include a display screen 120 and an under-screen biometric identification device 140, wherein the display screen 120 has a display area 102, and the under-screen biometric identification device 140 is disposed at The lower part of the display screen 120 is described.
  • the display screen 120 may be a self-luminous display screen, which uses a self-luminous display unit as a display pixel.
  • the display 120 may be an Organic Light-Emitting Diode (OLED) display or a Micro-LED display.
  • the display screen 120 may also be a liquid crystal display (Liquid Crystal Display, LCD) or other passive light-emitting display, which is not limited in the embodiment of the present application.
  • the display screen 120 may specifically be a touch display screen, which can not only perform screen display, but also detect a user's touch or press operation, thereby providing a human-computer interaction interface for the user.
  • the electronic device 100 may include a touch sensor, and the touch sensor may specifically be a touch panel (TP), which may be disposed on the surface of the display screen 120 or partially Integrated or integrated into the display screen 120 to form the touch display screen.
  • TP touch panel
  • the under-screen biometric identification device 140 may be an under-screen biometric identification device, which may include an optical biometric sensor having an optical sensing array, such as an optical fingerprint sensor; the optical sensing array includes a plurality of optical sensing units, and the The area where the optical sensing array is located is the biometric collection area of the under-screen biometric identification device 140, and the plurality of optical sensing units are used to collect fingerprint feature information (such as fingerprint image information) of the user.
  • an optical biometric sensor having an optical sensing array, such as an optical fingerprint sensor
  • the optical sensing array includes a plurality of optical sensing units, and the The area where the optical sensing array is located is the biometric collection area of the under-screen biometric identification device 140, and the plurality of optical sensing units are used to collect fingerprint feature information (such as fingerprint image information) of the user.
  • the under-screen biometric identification device 140 may be disposed at least in a local area below the display screen 120, so that the under-screen biometric identification device 140's biometric acquisition area (or sensing area) is at least partially located on the display.
  • the display area 102 of the screen 120 is disposed at least in a local area below the display screen 120, so that the under-screen biometric identification device 140's biometric acquisition area (or sensing area) is at least partially located on the display.
  • the on-screen biometric identification device 140 has a biometric collection area 130, and the biometric collection area 130 is located in the display area 102 of the display screen 120. Therefore, when the user needs to unlock the electronic device or verify other biometrics, the user only needs to press his finger on the biometric collection area 130 located on the display screen 120 to implement the biometric input operation. . Since the biometric collection detection can be implemented inside the display area 102 of the display screen 120, the electronic device 100 adopting the above structure does not need a special reserved space on the front side to set fingerprint keys (such as the Home key), so a full-screen solution can be adopted. That is, the display area 102 of the display screen 120 can be substantially extended to the entire front of the electronic device 100.
  • an OLED display screen is used as an example in the display screen 120.
  • the display screen 120 has OLED display units arranged in an array.
  • the under-screen biometric identification device 140 can use the OLED display screen.
  • An OLED display unit (ie, an OLED light source) 120 located in the biometric collection area 130 is used as an excitation light source for biometric detection and identification.
  • the under-screen biometric identification device 140 may also use a built-in light source or an external light source to provide a light signal for biometric detection and identification.
  • the under-screen biometric recognition device can be applied not only to self-luminous displays such as OLED displays, but also to non-self-luminous displays, such as liquid crystal displays or other passive light-emitting displays.
  • the optical sensing array of the under-screen biometric identification device 140 may specifically be a photodetector array (also referred to as a photodetector array), which includes a plurality of photodetectors or photovoltaics distributed in an array. The detector, the light detector or the photodetector can be used as the optical sensing unit as described above.
  • the light emitted by the display unit of the biometric collection area 130 reflects on the finger and forms reflected light
  • the reflected light may carry fingerprint characteristic information of a user's finger. For example, after the light is reflected on the fingerprint on the surface of the user's finger, the reflected light of the ridges and valleys of the fingerprint of the finger is different, so the reflected light can carry the user's fingerprint information.
  • the reflected light is returned to the display screen 120 and received by the photodetector array of the under-screen biometric recognition device 140 below it and converted into a corresponding electrical signal, that is, a biometric detection signal.
  • the electronic device 100 can obtain the user's biometric information based on the biometric detection signal, and can further perform biometric matching verification to complete the identity verification of the current user in order to confirm whether he has the authority to the electronic device 100 Proceed accordingly.
  • the under-screen biometric identification device 140 may also be disposed in the entire area below the display screen 120, thereby extending the biometric collection area 130 to the entire display of the entire display screen 120. Area 102, which realizes full-screen biometric identification.
  • the electronic device 100 may further include a protective cover 110, which may be specifically a transparent cover, such as a glass cover or a sapphire cover, which is located on the display Above the screen 120 and covering the front surface of the electronic device 100, a surface of the protective cover 110 may further be provided with a protective layer. Therefore, in the embodiment of the present application, the so-called finger pressing on the display screen 120 may actually mean that the finger presses the cover 110 above the display screen 120 or the surface of the protective layer covering the cover 110.
  • a protective cover 110 which may be specifically a transparent cover, such as a glass cover or a sapphire cover, which is located on the display Above the screen 120 and covering the front surface of the electronic device 100, a surface of the protective cover 110 may further be provided with a protective layer. Therefore, in the embodiment of the present application, the so-called finger pressing on the display screen 120 may actually mean that the finger presses the cover 110 above the display screen 120 or the surface of the protective layer covering the cover 110.
  • the under-screen biometric identification device 140 may use a periodic micro-hole array to transmit light to the sensing array, which requires an optical fingerprint identification module to be affixed under the OLED screen, which is complicated and costly.
  • the under-screen biometric identification device 140 may use an integrated micro lens to transmit light to the sensing array.
  • the integrated micro lens refers to designing the micro lens and the sensing array as a whole and further The integrated module is formed. Because the integrated module has a very high precision requirement in the mass production process, the general processing technology can not meet the actual needs.
  • an off-screen biometric recognition device 140 is proposed. More specifically, the under-screen biometric identification device 140 may include a lens, a lens barrel, and a sensor chip.
  • the lens is disposed below the display screen, and the lens is configured to receive reflections formed by human fingers from above the display screen.
  • the optical signal is used to detect biometric information of the finger; the lens is fixed in the lens barrel; the sensor chip is disposed below the lens barrel, and the sensor chip is used for The imaging is performed based on a light signal passing through the lens, wherein a distance between a photosensitive surface of the sensor chip and an imaging surface of the lens is greater than or equal to a preset value.
  • the distance between the photosensitive surface of the sensor chip and the imaging surface of the lens is greater than or equal to a preset value, and it can also be understood that the photosensitive surface of the sensor chip is out of focus.
  • the lens will not only receive the light signals formed by the reflection of human fingers from the upper part of the display screen, but also the light signals formed by the structure of the display screen (for example, internal circuits).
  • the photosensitive surface of the chip is on the same plane as the imaging surface of the lens.
  • the light signal formed by the display's own structure will affect the biometric information collection of the finger. Therefore, the distance between the photosensitive surface of the sensor chip and the imaging surface of the lens is greater than Or it is equal to a preset value, that is, relative to the lens, the photosensitive surface of the sensor chip is in a defocused state.
  • the light signal formed by the display's own structure reflects the transmission from the top of the display when it reaches the photosensitive surface of the sensor chip
  • the influence of the light signal formed by the human finger reflection is greatly reduced.
  • the preset value is 10 ⁇ m, the influence is negligible.
  • the lens in the embodiment of the present application needs to be configured as a component or device for modulating light that is more accurate and smaller than the assembly process of the front camera for taking pictures. Meet the requirements of precise focusing of optical fingerprints under the screen.
  • the technical solution of the embodiment of the present application is relative to the previous implementation (a periodic micro-hole array is used to transmit light to the sensing array), which avoids attaching the optical fingerprint recognition module to the lower surface of the display screen.
  • the biometric identification device 140 may be disposed below the display screen.
  • the lens is disposed below the display screen, which effectively simplifies the installation process of the biometric identification device 140 under the screen and improves the biometric identification under the screen.
  • the batch yield during the installation of the device 140 reduces the damage rate during the replacement process of the biometric identification device 140 under the screen, thereby effectively reducing the cost.
  • the technical solution of the embodiment of the present application is relative to the latter implementation (transmitting light to the sensing array by using an integrated micro lens), by setting a distance between the photosensitive surface of the sensor chip and the imaging surface of the lens.
  • the distance is greater than or equal to the preset value to achieve the desired optical imaging, which reduces the requirements on the processing technology, effectively solves the problem of excessive precision requirements of the integrated module during mass production, and also resolves the integrated module.
  • the batch yield problem during the production and assembly process solves the problem that the optimal focal length of the integrated module cannot be accurately aligned, thereby improving the efficiency of biometric recognition under the screen.
  • the display screen used in the technical solution of the embodiment of the present application may be an OLED screen, a soft screen, or a hard screen.
  • the following uses the OLED screen as an example for detailed description.
  • Below the OLED screen there is a layer of light-shielding layer, screen protection foam, optical glue, flexible circuit boards for screen components, etc. Each layer is perforated, and the OLED screen will leak light downward.
  • your finger When you place your finger over the OLED on the bright screen, your finger will reflect the light emitted by the OLED screen, and this reflected light will penetrate the OLED screen until it is below the OLED.
  • the fingerprint is a diffuse reflector and its reflected light exists in all directions.
  • Putting a micro-hole lens under the OLED screen can collect the light leaking above the fingerprint screen. This part of the light contains the fingerprint signal and the internal structure signal of the OLED screen.
  • the infrared component in the leaked light is filtered by the infrared cut-off optical filter, and the fingerprint image of the red light filtered by the sensor chip is received.
  • the imaging distance of the lens By adjusting the imaging distance of the lens to a tiny defocus range, the imaging of the internal structure of the OLED screen is blurred, but the fingerprint imaging is not affected.
  • FIG. 3 to FIG. 6 are schematic diagrams of an under-screen biometric identification device 200
  • FIG. 3 is a partial cross-sectional structure diagram of an under-screen biometric identification device 200
  • FIG. 4 is a schematic diagram of an imaging surface of the lens 210 located above a photosensitive surface of the sensor chip 230
  • FIG. 5 is a schematic diagram of an imaging surface of the lens 210 located below a photosensitive surface of the sensor chip 230
  • FIG. 6 is a partial cross-sectional structure diagram of another under-screen biometric identification device 200.
  • the under-screen biometric identification device 200 may include a lens 210, a lens barrel 220, and a sensor chip 230.
  • the lens 210 is disposed below the display screen, and is used for receiving a light signal formed by reflection of a human finger from above the display screen, and the light signal is used to detect biometric information of the finger; the lens 210 is fixed in the lens barrel 220; the sensor chip 230 is disposed below the lens barrel 220, and the sensor chip 230 is used for imaging based on a light signal passing through the lens 210, and the transmission
  • the distance between the photosensitive surface of the sensor chip 230 and the imaging surface of the lens 210 is greater than or equal to a preset value;
  • the display screen may be the display screen shown in FIG. 1 and FIG. 2, and related descriptions may refer to the foregoing.
  • the description of the display screen 120 is omitted here for brevity.
  • the photosensitive surface of the sensing chip 230 may be an upper surface thereof.
  • the structured light signal will affect the biometric information collection of the finger.
  • the distance between the photosensitive surface of the sensor chip 230 and the imaging surface of the lens 210 is greater than or equal to a preset value. It can be understood that the photosensitive surface of the sensor chip 230 is out of focus. status.
  • the two types of optical signals passing through the lens 210 are high-frequency signals. However, in comparison, when the photosensitive surface of the sensor chip 230 is in a defocused state, it is formed by reflection from a human finger above the display screen. The light signal passing through the lens 210 can still be clearly imaged on the photosensitive surface of the sensor chip 230, while the structured light signal inside the display screen passes through the lens 210 and cannot be on the photosensitive surface of the sensor chip 230. Imaging (or blurred imaging of structured light signals inside the display screen) cannot affect the biometric information collection of the finger.
  • the imaging conditions of the lens 210 may be the following optical imaging formulas:
  • u represents the object distance
  • v represents the image distance
  • f represents the focal distance. That is, the reciprocal of the object distance plus the reciprocal of the image distance is equal to the reciprocal of the focal distance.
  • the distance between the upper surface of the display screen and the optical center of the lens 210 is the object distance
  • the distance between the optical center of the lens 210 and the photosensitive surface of the sensor chip 230 is the image distance.
  • the focal length of the lens 210 is a fixed value.
  • the distance between the upper surface of the display screen, the optical center of the lens 210 and the photosensitive surface of the sensor chip 230 needs to satisfy the aforementioned optical imaging formula.
  • the imaging surface of the lens 210 is located above or below the photosensitive surface of the sensor chip 230 . That is, in the imaging conditions of the lens 210, when the object distance remains unchanged, the sensor chip can be implemented by changing the relative position of the photosensitive surface of the sensor chip 230 and the imaging surface of the lens 210. Defocus of the photosensitive surface of 230.
  • the photosensitive surface of the sensor chip 230 may be designed to coincide with the imaging surface of the lens 210.
  • the photosensitive surface of the sensor chip 230 needs to be mounted above or below the imaging surface of the lens 210.
  • the lens 210 and the transmission lens may be appropriately added.
  • the distance between the sensor chip 230 (the distance between the optical center O of the lens 210 and the photosensitive surface A of the sensor chip 230), for example, the height of the lens barrel 220 (the height below the lens 210 in the lens barrel 220 can be increased)
  • an optical filter is added between the lens barrel 220 and the sensor chip 230, so that the imaging surface B of the lens 210 is located above the photosensitive surface A of the sensor chip 230 the goal of.
  • the lens 210 and the lens 210 can be appropriately reduced.
  • the distance between the sensor chip 230 (the distance between the optical center O of the lens 210 and the photosensitive surface A of the sensor chip 230), for example, the height of the lens barrel 220 (below the lens 210 in the lens barrel 220) Height), or reduce the height of the lens barrel 220 (the height below the lens 210 in the lens barrel 220) by adding an optical filter between the lens barrel 220 and the sensor chip 230, thereby achieving all
  • the purpose of the imaging surface B of the lens 210 is below the photosensitive surface A of the sensor chip 230.
  • optical center O of the foregoing lens 210 is a special point in the lens 210, and the propagation direction of light passing through the special point does not change.
  • the optical center of the lens 210 is also referred to as the optical center of the lens 210.
  • the preset value is 10 ⁇ m. At this time, the influence of the structured light signal inside the display screen on the biometric information collection of the finger can be ignored.
  • the lens 210 may include a lens composed of at least one aspherical injection-molded lens to reduce imaging distortion of a fingerprint image.
  • the focal length of the lens composed of at least one aspherical injection-molded lens may be smaller than the focal length of the front camera used for taking pictures or the lens 210 is a macro lens to meet the requirements of fingerprint recognition under the screen.
  • the focal length range of the macro lens may be 0.4mm-1.8mm. It should be noted that the range is only an exemplary range of a gap that satisfies the imaging conditions, and embodiments of the present application are not limited thereto.
  • the focal length of the macro lens may be 2 mm.
  • the lens barrel 220 needs to be fixed.
  • the lens barrel 220 and its fixed components may be integratedly designed, that is, after the module is assembled, the lens barrel 220 has a fixed assembly position.
  • both The imaging conditions of the lens 210 can overcome the influence of the structured light signal inside the display screen on the biometric information collection of the finger.
  • the lower surface of the lens barrel 220 extends downward at the mouth of the lens barrel 220 to form a first fixing structure 221, and the lower surface of the lens barrel 220 is on the lens barrel 220.
  • a second fixed structure 222 extends downward at the edge of the lens, the lens barrel 220 forms a cavity between the first fixed structure 221 and the second fixed structure 222, and the lens 210 is fixed to the first Within the fixed structure 221.
  • passive components such as capacitors and microcontroller units (MCUs) may be disposed in a cavity formed between the first fixed structure 221 and the second fixed structure 222.
  • MCUs microcontroller units
  • first fixed structure 221 and the second fixed structure 222 there may also be a fixed structure between the first fixed structure 221 and the second fixed structure 222, which is not specifically limited in this embodiment of the present application.
  • a structure for preventing the lens 210 from moving upwards may be provided at the mouth of the upper surface of the first fixing structure 221.
  • the upper surface of the first fixing structure 221 extends inwardly at the mouth of the lens barrel 220 to form a first convex structure 223.
  • the first convex structure 223 is used to fix the lens. 210.
  • the inner surface of the lens barrel 220 and the lens 210 may be fixed by an adhesive bonding method.
  • the upper surface of the first fixing structure 221 may be designed as a specific structure, such as a funnel structure or a beveled structure, so that the light signals from the display screen reflected by human fingers pass through as much as possible.
  • the first fixing structure 221 further increases the amount of signals received by the lens 210.
  • the upper surface of the first fixing structure 221 is formed with a chamfer at the mouth of the barrel, so that the inner diameter of the first fixing structure 221 at the upper surface is larger than the first fixing structure.
  • an additional space for receiving glue may be provided between the inner surface of the lens barrel 220 and the lens 210 to increase the inner surface of the lens barrel 220 and the lens barrel 220.
  • the reliability of the attachment between the lenses 210 is described.
  • a first stepped structure 224 is formed on an inner surface of the first fixing structure 221 under the first protruding structure 223, and the lens 210 passes through the first protruding structure 223.
  • the first step structure 224 is fixed in the first fixing structure 221.
  • the first step structure 224 can greatly increase the accommodating space of the glue.
  • a foam can be provided on the upper surface of the lens barrel 220 to achieve the purpose of sealing and preventing dust.
  • the lens barrel 220 and its fixing component may be separately designed, that is, after the module is assembled, the lens barrel 220 has a fixed assembly position.
  • the imaging conditions of the lens 210 can overcome the influence of the structured light signal inside the display screen on the biometric information collection of the finger.
  • the lens barrel 220 may be supported by a lens holder 240, and a somewhat adhesive structure is formed between the lens holder 240 and the lens barrel 220, and the lens holder 240 and the lens barrel are formed. 220 is fixed by way of dispensing in the dispensing structure. For example, as shown in FIG.
  • the dispensing structure may include a second step structure 241 formed by an upper surface of the lens holder 240 extending downwardly in a peripheral area near the lens barrel 220.
  • the second step structure 241 can provide an accommodating space for the glue, so that the lens barrel 220 and the lens holder 240 can be fixedly connected by dispensing in the accommodating space provided by the second step structure 241.
  • the second step structure 241 may include one or more steps, which are not specifically limited in the embodiment of the present application.
  • second stepped structure 241 may be continuous or discrete around the lens barrel 220.
  • the embodiments of the present application are not specifically limited.
  • the reliability of the connection between the lens barrel 220 and the lens base 240 may be enhanced.
  • the lower surface of the lens holder 240 extends downwardly in a peripheral area near the lens barrel 220 to form a third fixing structure 242 surrounding the lens barrel 220.
  • the assembly such as the sensor chip 230 and the optical filter 240 affects, and the bottom of the third fixing structure 242 is in a suspended state.
  • the third fixing structure 242 may be continuous and fixed around the lens barrel 220, and may also be discretely fixed around the lens barrel 220, which is not specifically limited in the embodiment of the present application.
  • a lower surface of the lens holder 240 extends downward at an edge of the lens holder 240 away from the lens barrel 220 to form a fourth fixing.
  • Structure 243 wherein a descending height of the fourth fixing structure 243 is greater than a descending height of the third fixing structure 243.
  • the fourth fixing structure 243 may be continuous or discrete in a certain direction, which is not limited in the embodiment of the present application.
  • a structure for preventing the lens 210 from moving upwards may be provided at the mouth of the upper surface of the lens barrel 220.
  • the upper surface of the lens barrel 220 extends inwardly at the mouth of the barrel to form a second convex structure 225, and the second convex structure 225 is used to fix the lens.
  • the inner surface of the lens barrel 220 and the lens 210 may be fixed by an adhesive bonding method.
  • the upper surface of the second raised structure 225 may be designed as a specific structure, such as a funnel structure or a bevel structure, so that the light signal from the display screen reflected by a human finger is Pass the second protruding structure 225 as much as possible, thereby increasing the amount of signals received by the lens 210.
  • the upper surface of the lens barrel 220 is beveled by a chamfering process at the mouth of the barrel, so that the inner diameter of the lens barrel 220 at the upper surface is larger than that of the lens barrel 220 at the second surface. The inner diameter at the raised structure 225.
  • an additional space for receiving glue may be provided between the inner surface of the lens barrel 220 and the lens 210 to increase the inner surface of the lens barrel 220 and the lens barrel 220.
  • the reliability of the attachment between the lenses 210 is described.
  • a third stepped structure 226 is formed on the inner surface of the lens barrel 220 below the second protruding structure 225.
  • the lens 210 passes through the second protruding structure 225 and the second protruding structure 225.
  • the third step structure 226 is fixed in the lens barrel 220.
  • the third step structure 226 can greatly increase the accommodating space of the glue.
  • a foam can be provided on the upper surface of the lens holder 240 to achieve the purpose of sealing and preventing dust.
  • the lens 210, the lens barrel 220, and the lens base 240 may also be designed with other structures.
  • the lens 210 may also be designed with a size mark (a) of the lens 210
  • the lens barrel 220 may also be designed with a size mark (A1) of the lens barrel 220
  • the lens barrel 220 may also be designed with an assembly size
  • the lens barrel 220 can be assembled based on the assembly size. For example, different manufacturers may use different apertures and depths (ie, the diameter and depth of the lens barrel 220).
  • the lens barrel 220 shown in FIG. 3 may also be designed with a hole for fixing the lens barrel 220, such as a screw fixing hole.
  • the lens holder 240 shown in FIG. 6 may also be designed with a hole for fixing the lens holder 240, such as a screw fixing hole.
  • FIG. 7 and FIG. 8 are schematic diagrams of an under-screen biometric identification device 200 according to an embodiment of the present application.
  • FIG. 7 is a partial cross-sectional structural diagram of an in-screen biometric identification device 200 as shown in FIG. 3, which also integrates an optical filter 250 and a flexible printed circuit board 260.
  • FIG. 8 is an under-screen biometric device shown in FIG.
  • the feature recognition device 200 is also integrated with a partial cross-sectional structure diagram of an optical filter 250 and a flexible printed circuit board 260.
  • the lens 210 before the light signal passing through the lens 210 reaches the sensor chip 230, it may also be filtered by an optical filter to filter out unnecessary light.
  • the under-screen biometric identification device 200 may further include: an optical filter 250.
  • the optical filter 250 is located between the lens barrel 220 and the sensor chip 230.
  • the optical filter 250 is fixed on the upper surface of the sensor chip 230.
  • the optical filter 250 may be fixed on the sensor chip 230 through an optical adhesive.
  • the optical filter 250 covers at least the lower surface of the first fixing structure 221 by directly contacting the bottom of the lens barrel 220.
  • the optical filter 250 covers at least the lower surface of the lens barrel 220 by directly contacting the bottom of the lens barrel 220.
  • the optical filter 250 is used to reduce undesired background light in fingerprint sensing, so as to improve the optical sensing of the received light by the sensor chip 230.
  • the optical filter 250 may be specifically configured to filter out ambient light wavelengths, for example, near-infrared light and some red light. Another example is blue light or part of blue light. For example, human fingers absorb most of the energy of light with a wavelength below ⁇ 580nm. If one or more optical filters or optical filter coatings can be designed to filter light from 580nm to infrared, the ambient light can be greatly reduced Impact on optical detection in fingerprint sensing.
  • the optical filter 250 may be an infrared cut-off optical filter and / or a blue light cut-off optical filter.
  • the optical filter 250 may include one or more optical filters, and the one or more optical filters may be configured as, for example, band-pass filters to allow OLED pixels Transmission of emitted light while blocking other light components such as infrared light in sunlight.
  • the one or more optical filters may be implemented, for example, as an optical filter coating, which is formed on one or more continuous interfaces, or may be implemented as one or more discrete interfaces. It should be understood that the optical filter 250 may be fabricated on the surface of any optical component, or along the optical path of the reflected light formed by the finger reflection to the sensor chip 230.
  • the embodiment of the present application only uses the optical filter 250 on the upper surface of the sensor chip 230 as an example, but the present application is not limited thereto.
  • the optical filter 250 may be attached to a bottom surface of a display, an upper / lower surface of a lens, a lens barrel, or the inside of the sensor chip 230.
  • the under-screen biometric identification device 200 may further include a circuit board for transmitting signals, as shown in FIG. 7 and FIG. 8, the circuit board may be a flexible printed circuit board (Flexible Printed Circuit, FPC) 260.
  • FPC Flexible Printed Circuit
  • the sensor chip 230 may be fixed on the upper surface of the flexible printed circuit board 260 by a die-cast adhesive, and the sensor chip 230 is electrically connected to the flexible printed circuit board 260 through a bonding wire 261. .
  • the sensor chip 230 may also be soldered to the flexible printed circuit board 260 through pads.
  • the sensing chip 230 may implement electrical interconnection and signal transmission with other peripheral circuits or other components of the electronic device 100 as shown in FIG. 1 or 2 through the flexible printed circuit board 260.
  • the sensor chip 230 may receive a control signal of a processing unit of the electronic device 100 through the flexible printed circuit board 260, and may further detect the biometric detection signal through the flexible printed circuit board 260. (For example, a fingerprint image) is output to a processing unit or a control unit of the electronic device 100.
  • the lower surface of the second fixing structure 222 and the upper surface of the flexible printed circuit board 260 are fixedly connected at an edge region of the sensor chip 230.
  • the lower surface of the fourth fixing structure 243 and the upper surface of the flexible printed circuit board 260 are fixedly connected at an edge region of the sensor chip 230.
  • the lower surface of the second fixing structure 222 of the lens barrel 220 or the fourth fixing structure 243 of the lens holder 240 may be fixed by applying glue on the flexible printed circuit board 260 Achieve hermetic bonding.
  • the fixing glue may be an epoxy system or an acrylic system.
  • the fixing glue has at least one of the following characteristics: impervious to visible light, having a thickness of 0.02 mm to 0.10 mm, a viscosity of more than 20000 mPas, and a curing shrinkage. ⁇ 3%.
  • the curing method of the fixing glue can be low temperature curing within 85 ° C, UV curing (Ultraviolet Rays, UV), or UV curing combined with low temperature curing within 85 ° C.
  • the UV curing principle is that the photoinitiator (or photosensitizer) in the UV curing material absorbs ultraviolet light under the irradiation of ultraviolet rays to generate active free radicals or cations, triggering monomer polymerization and cross-linking chemical reactions to make the adhesive The mixture changes from liquid to solid in seconds.
  • an exhaust hole may be formed in the lens barrel 220 shown in FIG. 7, and the exhaust hole is used to adjust the lens barrel 220 and the flexible printed circuit.
  • An exhaust hole may be formed in the lens holder 240 as shown in FIG. 8, and the exhaust hole is used to adjust the pressure intensity of the internal space formed by the lens holder 240 and the flexible printed circuit board 260.
  • the under-screen biometric identification device 200 further includes a steel plate, and the steel plate is fixed on the lower surface of the flexible printed circuit board 260.
  • the under-screen biometric identification device further includes: a fixing frame 270.
  • the lens barrel 220 is fixed below the display screen through the fixing frame 270, and the distance between the upper surface of the display screen and the optical center of the lens 210 satisfies Imaging conditions.
  • the lens mount 240 is fixed below the display screen by the fixing frame 270, and the distance between the upper surface of the display screen and the optical center of the lens 210 satisfies imaging conditions.
  • At least one of the following mounting methods can be used for mounting and fixing: screw mounting Fixing method, glue bonding fixing method, welding fixing method and coupling fixing method.
  • the under-screen biometric identification device 200 may be fixedly connected to a device easily removable inside the terminal device to be installed under the display screen.
  • the above-mentioned easily detachable device can be used as the fixing frame 270 between the under-screen biometric identification device 200 and the display screen.
  • the in-screen biometric identification device 200 may be fixedly disposed below the display screen in a non-contact manner by using other auxiliary components.
  • the under-screen biometric identification device 200 may be fixed to the fixing frame 270 and fixedly disposed under the display screen through the fixing frame 270.
  • the fixed frame 270 is a middle frame of the terminal device, and the middle frame The frame is used to support the display screen.
  • the under-screen biometric identification device 200 and the display screen may be fixed below the display screen through a middle frame of the terminal device or other components.
  • FIG. 11 is a schematic diagram of fixing the under-screen biometric identification device 200 below the display screen 320 through a middle frame 370.
  • the on-screen biometric identification device 200 may be as shown in FIG. 3 or as shown in FIG. 6.
  • the following description uses the on-screen biometric identification device 200 as an example as shown in FIG. 6 as an example.
  • the display screen 320 may be an OLED display screen 120 as shown in FIG. 1 and FIG. 2, and the under-screen biometric identification device 200 may be an under-screen biometric identification device 140 as shown in FIG. 1 and FIG. 2. It may specifically include a lens 210, a lens barrel 220, a sensor chip 230, a lens holder 240, an optical filter 250, a flexible printed circuit board 260, and the like.
  • the under-screen biometric identification device 200 may be used to collect fingerprints or other biological features, and its biometric collection area is at least partially within the display area of the display screen 320 shown.
  • the middle frame 370 is a frame of the electronic device disposed between the display screen 320 and the back cover and used to carry various internal components.
  • the various internal components include, but are not limited to, a battery, a motherboard, a camera, a cable, various sensors, and a microphone. , Handset and so on.
  • the middle frame 370 may be made of a metal or alloy material, or even a plastic material. In this case, the middle frame 370 may even be integrally formed with the frame of the mobile terminal.
  • the integral molding refers to the internal middle frame and the frame. Is a whole.
  • the frame can be just a metal edge, or a metal-like coating can be plated on the middle frame.
  • the middle frame 370 may also be a composite middle frame, for example, including an inner middle frame and an outer middle frame, wherein the inner middle frame is used to carry mobile phone components (such as the lens holder 240), and the outer middle frame is inside the middle frame. Outside the frame, the outer edge of the outer frame is equipped with mobile phone keys, and the inner frame is integrated with the outer frame.
  • a gap exists between the in-screen biometric identification device 200 and the display screen 320.
  • the gap between the under-screen biometric identification device 200 and the display screen 320 is intended to make the distance between the upper surface of the display screen and the optical center of the lens 210 meet the imaging conditions.
  • the size and specific meaning of the gap are not limited.
  • the gap may be determined by a manufacturer through debugging during installation of the biometric identification device 200, or may be prescribed by each manufacturer.
  • the gap may be the distance between the upper surface of the lens barrel 220 and the lower surface of the display screen 320, or the distance between the upper surface of the bracket 230 and the lower surface of the display screen 320.
  • a gap width between the under-screen biometric recognition device 200 and the display screen 320 may be greater than or equal to a first distance, and the first distance is the The minimum distance between the lens barrel 220 and the display screen 320 when the terminal device is in a shock state such as a drop or a collision.
  • the gap width may range from 0.3 mm to 1 mm. It should be noted that the range is only an exemplary range of the gap, and embodiments of the present application are not limited thereto.
  • the under-screen biometric identification device 200 may be easily detached inside the terminal device through a fixed connection. Any device can be installed under the display screen 320 to ensure that there is a gap between the under-screen biometric identification device 200 and the display screen 320. As long as the in-screen biometric identification device 200 can be fixedly disposed under the display screen 320 in a non-contact manner. In other embodiments, the under-screen biometric identification device 200 may also be fixed to an easily removable device such as a back cover, a main board, and a battery of the mobile terminal, and may be further fixed below the display screen 320.
  • an easily removable device such as a back cover, a main board, and a battery of the mobile terminal
  • the under-screen biometric identification device 200 is disposed below the display screen 320 in a non-contact manner and does not contact the lower surface of the display screen 320, that is, the under-screen biometric identification device 200 and all The display screen 320 is completely decoupled, which avoids damaging the display screen 320 when the under-screen biometric identification device 200 is disassembled.
  • the under-screen biometric identification device 200 and the lower surface of the display screen 320 are not in contact, a fixed gap is maintained between the two, and the gap may be an air gap that is not filled with any auxiliary materials. ), Which can ensure that the under-screen biometric identification device 200 does not contact the lower surface of the display screen 320 when the display screen 320 is pressed or the terminal device is dropped or bumped, and it will not affect the The biometric recognition stability and performance of the biometric recognition device 200 under the screen.
  • the under-screen biometric identification device 200 and the lower surface of the display screen 320 separately, it is possible to reduce the difficulty of disassembling the under-screen biometric identification device 200, thereby further improving Maintainability of terminal equipment. Further, it is possible to reduce the complexity of installing the under-screen biometric identification device 200 below the display screen 320 during the production process of the under-screen biometric identification device, and increase the under-screen biometric identification device. Production success rate, which in turn reduces production costs. In addition, the stability and performance of the biometric recognition of the under-screen biometric recognition device 200 will not be affected.
  • the positional relationship between the display screen 320 and the middle frame 370 is relatively fixed.
  • a screen assembly flexible circuit board 360 is further included between the display screen 320 and the middle frame 370, and the display screen 320 may pass through the display
  • the flexible printed circuit board 360 of the screen assembly realizes electrical interconnection and signal transmission with other peripheral circuits or other elements of the electronic device 100 as shown in FIG. 1 or 2.
  • a foam 340 is provided between the display screen 320 and the flexible circuit board 360 of the screen assembly, and the foam 340 is bonded to the display screen 320 through an optical glue 330.
  • the foam 340 is bonded to the screen assembly flexible circuit board 360 through an optical adhesive 350.
  • the screen assembly flexible circuit board 360 is fixed below the display screen 320 through the optical glue 330, the foam 340, and the optical glue 350.
  • the foam 340 is also sealed and dustproof. effect.
  • the middle frame 370 and the flexible circuit board 360 of the screen assembly are sealed and connected by a foam 380, and the foam 380 is a compressible foam with at least one side being backed with adhesive.
  • the compression ratio of the foam 380 is> 50%.
  • the foam 380 in addition to being used for bonding the screen assembly flexible circuit board 360 and the middle frame 370, the foam 380 also has the effect of sealing and preventing dust.
  • the stability of the fixed connection can be increased.
  • a positioning post 245 is provided on the lens base 240 of the in-screen biometric identification device 200, and a positioning hole 371 is provided on the middle frame 370.
  • the positioning hole 371 can form precise positioning.
  • the positioning post 245 and the positioning hole 371 are bonded by a double-sided adhesive 390, which is a double-sided adhesive with a certain thickness and size holding force. .
  • each stack between the display screen 320 and the under-screen biometric identification device 200 is formed with an opening in an installation area of the under-screen biometric identification device 200.
  • the under-screen biometric identification device 200 is disposed below the opening, and its optical sensing array is directly opposite the lower surface of the display screen 320 through the opening. Therefore, when the under-screen biometric identification device 200 is disposed on the lower surface of the middle frame 370, it can be ensured that the under-screen biometric identification device 200 can receive the reflected light through the opening.
  • the size of the opening is not specifically limited in the embodiment of the present application.
  • the size of the opening of the middle frame 370 may be smaller than or equal to the size of the under-screen biometric identification device 200.
  • the size of the opening of the middle frame 370 may be greater than or equal to the size of the lens barrel 220.
  • the size of the opening in the middle frame 370 is larger than the size of the lens barrel 220, and the size of the opening 371 in the middle frame 370 is smaller than the under-screen biological feature. Identify the size of the device 200.
  • the lens barrel 220 may be partially accommodated in the opening of the middle frame 370, and a buffer space may be formed between the lens barrel 220 and the middle frame 370, which can ensure that when the middle frame 370 is pressed or terminated When the device is dropped or collided, the lens barrel 220 does not contact the middle frame 370, nor does it affect the biometric recognition stability and performance of the under-screen biometric recognition device 200.
  • the distance from the display screen 320 to the middle frame 370 constitutes a partial image distance of the under-screen biometric recognition device 200.
  • the display screen 320 The openings of each of the laminated structure materials below must not block the effective light path, and at the same time, a good seal is formed between the laminates to avoid contamination of the lens (mainly refers to light signal pollution), thereby affecting the imaging quality.
  • a cover plate 310 is further provided on the upper surface of the display screen 320.
  • the cover plate 310 may be a transparent protective cover plate, such as a glass cover plate or a sapphire cover plate, which may cover the display screen 320, and a lower surface of the cover plate 310 may be the same as that of the display screen 320.
  • the upper surface that is, the display surface
  • the display screen 320 and the cover plate 310 may be connected by an adhesive layer, or may be connected by other connection methods, which is not limited in the embodiment of the present application.
  • the under-screen biometric identification device 200 when the under-screen biometric identification device 200 adopts an optical method for biometric identification, such as optical fingerprint identification, the under-screen biometric identification device 200 needs to detect that a light signal emitted by the display screen 320 passes through a finger. Reflected reflected light.
  • the installation area of the under-screen biometric identification device 200 on the middle frame 370 may also be used. Perform thinning.
  • the screen-down biometric identification device 200 and the display screen 320 are designed separately.
  • the screen-down biometric identification device 200 can be fixed on the middle frame 370 or the back cover structure.
  • the present invention solves the problems that the current under-screen biometric identification device directly attaches the under-screen biometric identification device 200 to the display screen 320, the disassembly is difficult, the display screen 320 is easily damaged, and the process is difficult to apply.
  • a gap is formed between the under-screen biometric identification device 200 and the lower surface of the display screen 320, and the gap can ensure that the display screen 320 is pressed or when the terminal Under conditions such as a device falling or colliding, the under-screen biometric identification device 200 does not contact the lower surface of the display screen 320 to avoid damaging the display screen 320.
  • the above-mentioned on-screen biometric identification device 200 may also be referred to as a biometric identification module.
  • the photo-detector array can also be called a photo-sensor array, which can transmit the light transmitted by the lens 220.
  • the photo sensor array may use an array of photodiodes, and the optical signals are converted into electrical signals through the photodiodes, so that imaging can be performed according to the electrical signals.
  • FIG. 12 is a schematic diagram of the assembly process of the biometric identification device 200 under the screen.
  • the assembly process 400 includes:
  • Passive components such as capacitors and MCUs are fixed on the sensing chip 230, and at the same time, the passive components are electrically connected to the sensing chip 230.
  • the sensor chip is attached.
  • the sensor chip 230 is fixed on the flexible printed circuit board 260 through a die-bond.
  • the optical filter is bonded.
  • the optical filter 250 is fixed on the sensor chip 230 through optical glue.
  • the sensor chip is bound.
  • the sensor chip 230 is electrically connected to the flexible printed circuit board 260 through a bonding wire 261.
  • the lens assembly fits.
  • the lens 210 is installed in the lens barrel 220, and the second fixing structure 222 of the lens barrel 220 is fixed on the flexible printed circuit board 260 through fixing glue.
  • the lens 210 is installed in the lens barrel 220, the lens holder 240 and the lens holder 220 are fixedly connected, and the fourth fixing structure 243 of the lens holder 240 is fixed by the adhesive It is fixed on the flexible printed circuit board 260.
  • the fixing glue may be an epoxy system or an acrylic system.
  • the fixing glue has at least one of the following characteristics: it is impermeable to visible light, has a thickness of 0.02 mm to 0.10 mm, a viscosity of more than 20000 mPas, and curing shrinkage The rate is ⁇ 3%.
  • the curing method of the fixing glue may be low-temperature curing within 85 ° C, UV curing, or UV curing combined with low-temperature curing within 85 ° C.
  • the test of the under-screen biometric identification device 200 is mainly performed, for example, a fingerprint detection test.
  • the surface of the module is double-sided adhesive.
  • the above module is the under-screen biometric identification device 200.
  • the lens barrel of the under-screen biometric identification device 200 (as shown in the scheme in FIG. 3) or the lens holder (as shown in FIG. 6) Double-sided tape is applied on the upper surface of the solution shown.
  • the module pastes the middle frame component.
  • the lens barrel (as shown in the scheme shown in FIG. 3) or the lens holder (as shown in the scheme shown in FIG. 6) of the under-screen biometric identification device 200 is fixed to the middle frame 370 (the fixing member 270) by double-sided adhesive.
  • a biometric identification component is further provided, which may include an under-screen biometric identification device and a module bracket; when the biometric identification component is applied to the under-screen biometric identification device as described above or When a terminal device is installed, it can be directly mounted to the middle frame or fixed frame of the terminal device, and when the under-screen biometric identification device or the under-screen biometric identification device of the terminal device is damaged, the damaged The biometric identification component is replaced, so the complexity of maintenance and device replacement of the biometric identification device under the replacement screen can be further reduced, and damage to the display screen can be avoided.
  • An embodiment of the present application further provides an electronic device.
  • the electronic device may include a display screen and an under-screen biometric identification device in various embodiments of the present application.
  • the under-screen biometric identification device is provided on the display screen. Down, and make the distance between the upper surface of the display screen and the optical center of the lens in the biometric identification device below the screen meet the imaging conditions.
  • the electronic device may be any electronic device with a display screen, which uses the technical solution of the embodiment of the present application to realize biometric identification under the screen.
  • the display screen may be an organic light emitting diode display screen including a plurality of organic light emitting diode light sources, wherein the under-screen biometric identification device uses at least part of the organic light emitting diode light source as an excitation light source for biometric identification.
  • the disclosed systems and devices may be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may also be electrical, mechanical or other forms of connection.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions in the embodiments of the present application.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above integrated unit may be implemented in the form of hardware or in the form of software functional unit.
  • the integrated unit When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium.
  • the storage medium includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiments of the present application.
  • the foregoing storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes .

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Abstract

提供了一种的屏下生物特征识别装置和电子设备，该屏下生物特征识别装置包括：镜头，设置在显示屏的下方，用于接收来自该显示屏上方的经由人体手指反射形成的光信号，该光信号用来检测该手指的生物特征信息；镜筒，该镜头固定在该镜筒内；传感芯片，该传感芯片设置在该镜筒的下方，该传感芯片用于基于穿过该镜头的光信号进行成像，其中，该传感芯片的感光面与该镜头的成像面之间的距离大于或者等于预设值。本申请实施例提供的屏下生物特征识别装置和电子设备，能够提升屏下生物特征识别的效率。

Description

屏下生物特征识别装置和电子设备 技术领域
本发明实施例涉及生物特征识别领域，并且更具体地，涉及一种屏下生物特征识别装置和电子设备。
背景技术
随着电子设备行业的快速发展，尤其是移动通信设备(例如，手机)的高速发展，生物识别技术越来越受到人们重视，更加便捷的屏下生物特征识别技术，例如屏下指纹识别技术的实用化已成为大众所需。
目前，屏下光学指纹识别技术主要包括基于周期性微孔阵列的屏下光学指纹识别技术和基于一体式的微透镜屏下光学指纹识别技术。前一种光学指纹识别技术容易受到莫尔条纹的影响，并且需要将光学指纹识别模组贴在OLED屏下，工序复杂。后一种屏下光学指纹识别技术的指纹识别模组是一体式的，其在量产过程中对于整个光学指纹识别模组的精度要求非常高，一般的加工工艺满基本足不了实际需求。由于上述各种问题的存在，影响了屏下生物特征识别的效率。
因此，如何提升屏下生物特征识别的效率，成为一个亟待解决的技术问题。
发明内容
提供了一种的屏下生物特征识别装置和电子设备，能够提升屏下生物特征识别的效率。
第一方面，提供了一种屏下生物特征识别装置，包括：
镜头，设置在显示屏的下方，用于接收来自所述显示屏上方的经由人体手指反射形成的光信号，所述光信号用来检测所述手指的生物特征信息；
镜筒，所述镜头固定在所述镜筒内；
传感芯片，所述传感芯片设置在所述镜筒的下方，所述传感芯片用于基于穿过所述镜头的光信号进行成像，其中，所述传感芯片的感光面与所述镜头的成像面之间的距离大于或者等于预设值。
在一些可能的实现方式中，所述镜头的成像面位于所述传感芯片的感光 面的上方或者下方。
在一些可能的实现方式中，所述预设值为10μm。
在一些可能的实现方式中，所述镜头包括由至少一片非球面注塑镜片组成的透镜。
在一些可能的实现方式中，所述镜头为微距镜头。
在一些可能的实现方式中，所述微距镜头的焦距范围为0.4～1.8mm。
在一些可能的实现方式中，所述镜筒的下表面在所述镜筒的筒口处向下延伸形成第一固定结构，所述镜筒的下表面在所述镜筒的边缘处向下延伸形成第二固定结构，所述镜筒在所述第一固定结构与所述第二固定结构之间形成空腔，所述镜头固定在所述第一固定结构内。
在一些可能的实现方式中，所述第一固定结构的上表面在所述镜筒的筒口处向内延伸形成第一凸起结构，所述第一凸起结构用于固定所述镜头。
在一些可能的实现方式中，所述第一固定结构的上表面在筒口处通过倒角处理形成有斜角，使得所述第一固定结构在上表面处的内径大于所述第一固定结构在所述第一凸起结构处的内径。
在一些可能的实现方式中，所述第一固定结构的内侧表面在所述第一凸起结构的下方形成有第一台阶结构，所述镜头通过所述第一凸起结构和所述第一台阶结构固定在所述第一固定结构内。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
光学滤波片，位于所述镜筒和所述传感芯片之间，其中，所述光学滤波片固定在所述传感芯片的上表面，且通过与所述镜筒底部直接接触的方式至少覆盖所述第一固定结构的下表面。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
柔性印制电路板，所述传感芯片固定在所述柔性印制电路板的上表面，所述第二固定结构的下表面与所述柔性印制电路板的上表面在所述传感芯片的边缘区域固定连接。
在一些可能的实现方式中，所述镜筒通过在所述柔性印制电路板上点固定胶的方式实现密封粘结。
在一些可能的实现方式中，所述镜筒形成有排气孔，所述排气孔用于调整所述镜筒和所述柔性印制电路板形成的内部空间的气压强度。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
固定架，所述镜筒通过所述固定架固定在所述显示屏的下方，并使得所述显示屏的上表面与所述镜头的光学中心之间的距离满足成像条件。
在一些可能的实现方式中，所述固定架与所述镜筒通过以下安装方式中的至少一种进行的安装固定：螺钉安装固定方式、胶材贴合固定方式、焊接固定方式和耦合固定方式。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
镜座，所述镜座用于支撑所述镜筒。
在一些可能的实现方式中，所述镜座与所述镜筒之间形成有点胶结构，所述镜座与所述镜筒之间通过在所述点胶结构内进行点胶的方式进行固定。
在一些可能的实现方式中，所述点胶结构包括：所述镜座的上表面在靠近所述镜筒的外围区域向下延伸形成的第二台阶结构。
在一些可能的实现方式中，所述镜座的下表面在靠近所述镜筒的外围区域向下延伸形成围绕固定所述镜筒的第三固定结构，且所述第三固定结构的底部处于悬空状态。
在一些可能的实现方式中，所述镜座的下表面在所述镜座远离所述镜筒的边缘处向下延伸形成第四固定结构，其中，所述第四固定结构的下延高度大于所述第三固定结构的下延高度。
在一些可能的实现方式中，所述镜筒的上表面在筒口处向内延伸形成第二凸起结构，所述第二凸起结构用于固定所述镜头。
在一些可能的实现方式中，所述镜筒的上表面在筒口处通过倒角处理形成有斜角，使得所述镜筒在上表面处的内径大于所述镜筒在所述第二凸起结构处的内径。
在一些可能的实现方式中，所述镜筒的内侧表面在所述第二凸起结构的下方形成有第三台阶结构，所述镜头通过所述第二凸起结构和所述第三台阶结构固定在所述镜筒内。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
光学滤波片，位于所述镜筒和所述传感芯片之间，其中，所述光学滤波片固定在所述传感芯片的上表面，且通过与所述镜筒底部直接接触的方式至少覆盖所述镜筒的下表面。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
柔性印制电路板，所述传感芯片固定在所述柔性印制电路板的上表面， 所述镜座的下表面与所述柔性印制电路板的上表面在所述传感芯片的边缘区域固定连接。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
钢板，所述钢板固定在所述柔性印制电路板的下表面。
在一些可能的实现方式中，所述镜座通过在所述柔性印制电路板上点固定胶的方式实现密封粘结。
在一些可能的实现方式中，所述镜座形成有排气孔，所述排气孔用于调整所述镜座和所述柔性印制电路板形成的内部空间的气压强度。
在一些可能的实现方式中，所述屏下生物特征识别装置还包括：
固定架，所述镜座通过所述固定架固定在所述显示屏的下方，并使得所述显示屏的上表面与所述镜头光学中心之间的距离满足成像条件。
在一些可能的实现方式中，所述固定架与所述镜座通过以下安装方式中的至少一种进行的安装固定：螺钉安装固定方式、胶材贴合固定方式、焊接固定方式和耦合固定方式。
在一些可能的实现方式中，所述传感芯片通过固晶胶固定在所述柔性印制电路板的上表面，且所述传感芯片通过绑定线电连接所述柔性印制电路板。
在一些可能的实现方式中，所述固定胶具有以下特性中的至少一种：不透可见光，厚度为0.02mm～0.10mm，粘度＞20000mPas，固化收缩率＜3％。
在一些可能的实现方式中，所述固定胶为环氧体系或丙烯酸体系的胶。
在一些可能的实现方式中，所述光学滤波片为红外截止光学滤波片和/或蓝光截止光学滤光片。
在一些可能的实现方式中，所述光学滤波片通过光学胶材固定在所述传感芯片上。
在一些可能的实现方式中，所述屏下生物特征识别装置应用于电子设备，所述固定架为所述电子设备的中框，所述中框用于支撑所述显示屏。
在一些可能的实现方式中，所述中框形成有开孔，所述镜筒至少部分容纳在所述开孔内，所述镜筒外侧和所述开孔的内侧之间存在间隙。
在一些可能的实现方式中，所述中框的上表面在所述开孔边缘通过倒角处理形成有斜角，所述斜角使得所述中框上表面的开孔宽度大于所述中框下表面的开孔宽度。
第二方面，提供了一种电子设备，包括：
第一方面所述的屏下生物特征识别装置。
在一些可能的实现方式中，所述电子设备还包括：
显示屏，所述屏下生物特征识别装置设置在所述显示屏的下方，并使得所述显示屏的上表面与所述屏下生物特征识别装置中的镜头的光学中心之间的距离满足预定的成像条件，其中，所述屏下生物特征识别装置的生物特征采集区域至少部分位于所述显示屏的显示区域之中。
在一些可能的实现方式中，所述电子设备还包括：中框，所述屏下生物特征识别装置通过所述中框装配至所述显示屏的下方，以使所述屏下生物特征识别装置与所述显示屏之间存在间隙。
在一些可能的实现方式中，所述电子设备还包括屏幕组件柔性线路板，所述屏幕组件柔性线路板位于所述显示屏和所述中框之间，且所述屏幕组件柔性线路板与所述中框之间通过至少一面背胶的可压缩泡棉进行密封固定。
在一些可能的实现方式中，若所述泡棉两面背胶，所述泡棉与所述屏幕组件柔性线路板粘结贴合的胶的粘性弱于所述泡棉与所述中框粘结贴合的胶的粘性。
在一些可能的实现方式中，所述泡棉的压缩率＞50％。
一方面，本申请实施例通过控制镜筒和/或光学滤波片的装配尺寸，使得传感芯片的感光面与镜头的成像面之间的距离大于或者等于预设值，即传感芯片的感光面可以处于离焦状态，从而，实现期望的光学成像，进而降低了对加工工艺的要求，也解决了一体式模组在生产组装过程中的批次性的良率问题和一体式模组的最佳焦距不能精确对准的问题，从而提升屏下生物特征识别的效率。
另一方面，避免了将光学指纹识别模组贴在显示屏的下表面，只需要将屏下生物特征识别装置设置在显示屏的下方即可，具体地，将镜头设置在显示屏的下方，有效简化了屏下生物特征识别装置的安装工序，提升了屏下生物特征识别装置的安装过程中的批次性的良率，降低了屏下生物特征识别装置的更换过程中的损坏率，进而有效降低了成本。
附图说明
图1是本申请可以适用的移动终端的平面示意图。
图2是图1所示的移动终端的部分剖面示意图。
图3是本申请提供的一种屏下生物特征识别装置200的部分剖面结构示意图。
图4是本申请实施例中镜头210的成像面位于传感芯片230的感光面上方的示意图。
图5是本申请实施例中镜头210的成像面位于传感芯片230的感光面下方的示意图。
图6是本申请提供的另一种屏下生物特征识别装置200的部分剖面结构示意图。
图7是本申请实施例的一种屏下生物特征识别装置中的光学滤波片以及印制电路板的部分剖面结构示意图。
图8是本申请实施例的另一种屏下生物特征识别装置中的光学滤波片以及印制电路板的部分剖面结构示意图。
图9是本申请实施例的一种屏下生物特征识别装置中的固定架的示意性结构图。
图10是本申请实施例的另一种屏下生物特征识别装置中的固定架的示意性结构图。
图11是本申请实施例提供的通过中框370将所述屏下生物特征识别装置200固定于显示屏320下方的示意图。
图12是本申请实施例的屏下生物特征识别装置200装配流程示意图。
具体实施方式
下面将结合附图，对本发明实施例中的技术方案进行描述。
随着智能终端步入全面屏时代，电子设备正面生物特征采集区域受到全面屏的挤压，因此屏下(Under-display或者Under-screen)生物特征识别技术越来越受到关注。屏下生物特征识别技术是指将屏下生物特征识别装置(比如指纹识别模组)安装在显示屏下方，从而实现在显示屏的显示区域内部进行生物特征识别操作，不需要在电子设备正面除显示区域外的区域设置生物特征采集区域。
屏下生物特征识别技术可以包括屏下光学生物特征识别技术、屏下超声波生物特征识别技术或者其他类型的屏下生物特征识别技术。
以屏下光学生物特征识别技术为例，屏下光学生物特征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。所述返回的光携带与所述顶面接触的物体(例如手指)的信息，通过捕获和检测所述返回的光实现位于显示屏幕下方的特定光学传感器模块。所述特定光学传感器模块的设计可以为通过恰当地配置用于捕获和检测返回的光的光学元件来实现期望的光学成像。
应理解，本申请实施例的技术方案可以应用于各种电子设备，更具体地，可以应用于具有显示屏的电子设备。例如智能手机、笔记本电脑、平板电脑、游戏设备等便携式或移动计算设备，以及电子数据库、汽车、银行自动柜员机(Automated Teller Machine，ATM)等其他电子设备，但本申请实施例对此并不限定。
还应理解，本申请实施例的技术方案除了可以进行指纹识别外，还可以进行其他生物特征识别，例如，活体识别等，本申请实施例对此也不限定。
图1和图2示出了屏下生物特征识别装置可以适用的电子设备100的示意图，其中图1为屏下生物特征识别装置可以适用的电子设备100的正面示意图，图2是图1所示的电子设备100沿A’-A’的部分剖面结构示意图。
如图1和图2所示，电子设备100可以包括显示屏120和屏下生物特征识别装置140，其中，所述显示屏120具有显示区域102，所述屏下生物特征识别装置140设置在所述显示屏120的下方。
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。比如显示屏120可以为有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏或者微型发光二极管(Micro-LED)显示屏。在其他替代实施例中，显示屏120也可以为液晶显示屏(Liquid Crystal Display,LCD)或者其他被动发光显示屏，本申请实施例对此不做限制。
显示屏120具体可以为触控显示屏，其不仅可以进行画面显示，还可以检测用户的触摸或者按压操作，从而为用户提供一个人机交互界面。比如，在一种实施例中，所述电子设备100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(Touch Panel，TP)，其可以设置在所述显示屏120表面，也可以部分集成或者整体集成到所述显示屏120内部，从而形成所述触控显示屏。
屏下生物特征识别装置140可以为光学屏下生物特征识别装置，其可以 包括具有光学感应阵列的光学生物特征传感器，比如光学指纹传感器；所述光学感应阵列包括多个光学感应单元，且所述光学感应阵列的所在区域为所述屏下生物特征识别装置140的生物特征采集区域，所述多个光学感应单元用于采集用户的指纹特征信息(比如指纹图像信息)。
所述屏下生物特征识别装置140可以至少设置在所述显示屏120下方的局部区域，从而使得所述屏下生物特征识别装置140的生物特征采集区域(或感应区域)至少部分位于所述显示屏120的显示区域102内。
如图1所示，所述屏下生物特征识别装置140具有生物特征采集区域130，且所述生物特征采集区域130位于所述显示屏120的显示区域102之中。由此，用户在需要对所述电子设备进行解锁或者其他生物特征验证的时候，只需要将手指按压在位于所述显示屏120的所述生物特征采集区域130，便可以实现生物特征的输入操作。由于生物特征采集检测可以在所述显示屏120的显示区域102内部实现，采用上述结构的电子设备100无需其正面专门预留空间来设置指纹按键(比如Home键)，因而可以采用全面屏方案，即所述显示屏120的显示区域102可以基本扩展到所述电子设备100的整个正面。
在生物特征识别过程中，以显示屏120采用OLED显示屏为例，所述显示屏120具有呈阵列式排布的OLED显示单元，所述屏下生物特征识别装置140可以利用所述OLED显示屏120位于所述生物特征采集区域130的OLED显示单元(即OLED光源)来作为生物特征检测识别的激励光源。当然，应当理解，在其他替代实现方案中，所述屏下生物特征识别装置140也可以采用内置光源或者外置光源来提供用于进行生物特征检测识别的光信号，在这种情况下，所述屏下生物特征识别装置不仅可以适用于如OLED显示屏等自发光显示屏，还可以适用于非自发光显示屏，比如液晶显示屏或者其他的被动发光显示屏。并且，所述屏下生物特征识别装置140的光学感应阵列具体可以为光探测器(Photo detector)阵列(或称为光电探测器阵列)，其包括多个呈阵列式分布的光探测器或光电探测器，所述光探测器或光电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(为便于描述，本申请统称为按压)在所述生物特征采集区域130时，所述生物特征采集区域130的显示单元发出的光线在手指发生反射并形成反射光，其中所述反射光可以携带有用户手指的指 纹特征信息。比如，所述光线在用户手指表面的指纹发生反射之后，由于手指指纹的纹脊和纹谷的反射光是不同的，因此反射光便携带有用户的指纹信息。所述反射光返回所述显示屏120并被其下方的屏下生物特征识别装置140的光探测器阵列所接收并且转换为相应的电信号，即生物特征检测信号。所述电子设备100基于所述生物特征检测信号便可以获得用户的生物特征信息，并且可以进一步进行生物特征匹配验证，从而完成当前用户的身份验证以便于确认其是否有权限对所述电子设备100进行相应的操作。
在其他替代实施例中，所述屏下生物特征识别装置140也可以设置在所述显示屏120下方的整个区域，从而将所述生物特征采集区域130扩展到整个所述显示屏120的整个显示区域102，实现全屏生物特征识别。
应当理解的是，在具体实现上，所述电子设备100还可以包括保护盖板110，所述保护盖板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的上方并覆盖所述电子设备100的正面，且所述保护盖板110表面还可以设置有保护层。因此，本申请实施例中，所谓的手指按压所述显示屏120可以实际上可以是指手指按压在所述显示屏120上方的盖板110或者覆盖所述盖板110的保护层表面。
在一种实现方式中，屏下生物特征识别装置140可以采用周期性微孔阵列将光线传输到感应阵列上，这需要将光学指纹识别模组贴在OLED屏下，工序复杂且成本过高。在另一种实现方式中，屏下生物特征识别装置140可以采用一体式的微透镜将光线传输到感应阵列上，所述一体式的微透镜是指将微透镜和感应阵列设计为一个整体进而形成一体式模组，由于一体式模组在量产过程中对精度要求非常高，一般的加工工艺满基本足不了实际需求。
为了解决上述技术问题，本申请实施例提供了一种改进的技术方案。具体地，提出了一种离焦状态的屏下生物特征识别装置140。更具体地，屏下生物特征识别装置140可以包括镜头、镜筒和传感芯片，所述镜头设置在显示屏的下方，所述镜头用于接收来自所述显示屏上方的经由人体手指反射形成的光信号，所述光信号用来检测所述手指的生物特征信息；所述镜头固定在所述镜筒内；所述传感芯片设置在所述镜筒的下方，所述传感芯片用于基于穿过所述镜头的光信号进行成像，其中，所述传感芯片的感光面与所述镜头的成像面之间的距离大于或者等于预设值。
需要注意的是，所述传感芯片的感光面与所述镜头的成像面之间的距离 大于或者等于预设值，也可以理解为所述传感芯片的感光面处于离焦状态。
应理解，在本申请实施例中，镜头除了会接收自显示屏上方的经由人体手指反射形成的光信号，也会接收显示屏自身结构(例如，内部线路)反射形成的光信号，若传感芯片的感光面与镜头的成像面位于同一平面，显示屏自身结构反射形成的光信号会影响手指的生物特征信息采集，因此，在传感芯片的感光面与镜头的成像面之间的距离大于或者等于预设值，即相对于镜头，传感芯片的感光面处于离焦状态，此时，显示屏自身结构反射形成的光信号在到达传感芯片的感光面时对自显示屏上方的经由人体手指反射形成的光信号造成影响大幅减小，在上述预设值为10μm时，其影响可以忽略不计。
需要注意的是，在某些场景下，本申请实施例中的镜头需要被配置为比用于拍照的前置摄像头的组装工艺更精准、体积更小的用于调制光的元件或器件，以达到屏下光学指纹精准对焦的要求。
本申请实施例的技术方案相对前一种实现方式(采用周期性微孔阵列将光线传输到感应阵列上)，避免了将光学指纹识别模组贴在显示屏的下表面，只需要将屏下生物特征识别装置140设置在显示屏的下方即可，例如，将所述镜头设置在所述显示屏的下方，有效简化了屏下生物特征识别装置140的安装工序，提升了屏下生物特征识别装置140的安装过程中的批次性的良率，降低了屏下生物特征识别装置140的更换过程中的损坏率，进而有效降低了成本。
而本申请实施例的技术方案相对后一种实现方式(采用一体式的微透镜将光线传输到感应阵列上)，通过设置所述传感芯片的感光面与所述镜头的成像面之间的距离大于或者等于预设值来实现期望的光学成像，进而降低了对加工工艺的要求，有效解决了一体式模组在量产过程中对精度要求过高的问题，进而也解决了一体式模组在生产组装过程中的批次性的良率问题，解决了一体式模组的最佳焦距不能精确对准的问题，从而提升屏下生物特征识别的效率。
在本申请实施例的技术方案中所使用的显示屏可以是OLED屏幕、软屏或硬屏，以下以OLED屏幕为例进行详细的阐述。在OLED屏幕下方有一层遮光层、屏幕保护泡棉、光学胶、屏幕组件柔性线路板等叠层，将各个叠层开孔，OLED屏会朝下方泄露光。当手指放于亮屏的OLED上方，手指就 会反射OLED屏发出的光，此反射光会穿透OLED屏直到OLED下方。需要注意的是，指纹是一个漫反射体，其反射光在各方向都存在。在OLED屏下方放一个微孔透镜可以收集指纹屏上方漏下来的光，这部分光包含指纹信号和OLED屏内部结构信号。通过红外截止光学滤波片将漏光中的红外成分滤除，通过传感芯片接收滤除红色光的指纹图像。通过调节调节镜头的成像距离在一个微小的离焦范围，使OLED屏内部结构的成像模糊，但指纹成像不受影响。
下面将结合图3至图11，对本申请实施例中的屏下生物特征识别装置200进行清楚地描述。需要说明的是，为便于说明，在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。
图3至图6示出了屏下生物特征识别装置200的示意图，其中图3是一种屏下生物特征识别装置200的部分剖面结构示意图。图4是镜头210的成像面位于传感芯片230的感光面上方的示意图。图5是镜头210的成像面位于传感芯片230的感光面下方的示意图。图6是另一种屏下生物特征识别装置200的部分剖面结构示意图。
如图3所示，屏下生物特征识别装置200可以包括：镜头210、镜筒220和传感芯片230。
其中：所述镜头210设置在显示屏的下方，用于接收来自所述显示屏上方的经由人体手指反射形成的光信号，所述光信号用来检测所述手指的生物特征信息；所述镜头210固定在所述镜筒220内；所述传感芯片230设置在所述镜筒220的下方，所述传感芯片230用于基于穿过所述镜头210的光信号进行成像，所述传感芯片230的感光面与所述镜头210的成像面之间的距离大于或者等于预设值；所述显示屏可以为图1和图2所示的显示屏，其相关说明可以参考可以参照前述关于显示屏120的描述，为了简洁，在此不再赘述。
应理解，所述传感芯片230的感光面可以是其上表面。
需要说明的是，不仅存在自显示屏上方的经由人体手指反射形成的光信号穿过所述镜头210，还会存在显示屏内部的结构光信号穿过调度镜头210，此时，显示屏内部的结构光信号会影响手指的生物特征信息采集。
应理解，所述显示屏发出的光在所述显示屏的上方被手指反射后，一部 分反射光可以被镜头210接收。
在本申请实施例中，所述传感芯片230的感光面与所述镜头210的成像面之间的距离大于或者等于预设值，可以理解为所述传感芯片230的感光面处于离焦状态。穿过所述镜头210的两种光信号都是高频信号，但相比较而言，在所述传感芯片230的感光面处于离焦状态时，自显示屏上方的经由人体手指反射形成的光信号穿过所述镜头210依然可以在所述传感芯片230的感光面上清晰成像，而显示屏内部的结构光信号穿过所述镜头210无法在所述传感芯片230的感光面上成像(或者，显示屏内部的结构光信号成像模糊)，也就无法对手指的生物特征信息采集造成影响。
可选地，在本申请一个实施例中，所述镜头210的成像条件可以为以下光学成像公式：
1/u+1/v＝1/f。
其中，u表示物距，v表示像距，f表示焦距。即物距的倒数加上像距的倒数等于焦距的倒数。在本申请实施例中，所述显示屏的上表面与镜头210光学中心之间的距离为物距，所述镜头210光学中心与传感芯片230的感光面之间的距离为像距，所述镜头210的焦距为一个固定值。
换句话说，镜筒220固定在显示屏的下方时，需要使得显示屏的上表面、镜头210光学中心以及传感芯片230的感光面之间的距离满足上述光学成像公式。
可选地，为了消除显示屏内部的结构光信号对指纹信号的成像产生的影响，在本申请实施例中，所述镜头210的成像面位于所述传感芯片230的感光面的上方或者下方。即在上述镜头210的成像条件中，在物距保持不变的情况下，可以通过改变所述传感芯片230的感光面与所述镜头210的成像面的相对位置来实现所述传感芯片230的感光面的离焦。
需要说明的是，为了使所述传感芯片230可以清晰成像，在设计时，可以将所述传感芯片230的感光面设计的与所述镜头210的成像面重合，在模组装配时，为了克服显示屏内部的结构光信号对手指的生物特征信息采集所造成的影响，需要将所述传感芯片230的感光面装配在所述镜头210的成像面的上方或者下方。
例如，如图4所示，在模组装配时，为了使所述镜头210的成像面B位于所述传感芯片230的感光面A的上方，可以适当的增加所述镜头210与所 述传感芯片230之间的距离(镜头210的光学中心O与传感芯片230的感光面A之间的距离)，例如，可以增加所述镜筒220的高度(镜筒220中镜头210以下的高度)，和/或，在所述镜筒220与所述传感芯片230之间增加光学滤波片，进而，实现所述镜头210的成像面B位于所述传感芯片230的感光面A的上方的目的。
又例如，如图5所示，在模组装配时，为了使所述镜头210的成像面B位于所述传感芯片230的感光面A的下方，可以适当的减小所述镜头210与所述传感芯片230之间的距离(镜头210的光学中心O与传感芯片230的感光面A之间的距离)，例如，可以降低所述镜筒220的高度(镜筒220中镜头210以下的高度)，或者，降低所述镜筒220的高度(镜筒220中镜头210以下的高度)结合在所述镜筒220与所述传感芯片230之间增加光学滤波片，进而，实现所述镜头210的成像面B位于所述传感芯片230的感光面A的下方的目的。
应理解，上述镜头210的光学中心O为镜头210中的一个特殊点，凡是通过所述特殊点的光，其传播方向不变。镜头210的光学中心又称为镜头210的光心(Optical center)。
优选地，所述预设值为10μm。此时，可以忽略显示屏内部的结构光信号对手指的生物特征信息采集所造成的影响。
可选地，在本申请一个实施例中，所述镜头210可以包括由至少一片非球面注塑镜片组成的透镜，以减小指纹图像的成像畸变。
需要注意的是，至少一片非球面注塑镜片组成的透镜的焦距可以比用于拍照用的前置摄像头的焦距小或所述镜头210为微距镜头，以达到屏下指纹识别的要求。例如，所述微距镜头的焦距范围可以为0.4mm-1.8mm。应注意，所述范围仅为满足成像条件的间隙的示例范围，本申请实施例不限于此。例如，所述微距镜头的焦距也可以是2mm。
为了实现上述模组装配目的，需要对镜筒220进行固定。
可选地，在本申请一个实施例中，可以对镜筒220以及其固定组件进行一体化设计，即在模组装配之后，所述镜筒220具有固定的装配位置，此时，既能满足所述镜头210的成像条件，又能克服显示屏内部的结构光信号对手指的生物特征信息采集所造成的影响。具体地，如图3所示，所述镜筒220的下表面在所述镜筒220的筒口处向下延伸形成第一固定结构221，所述镜 筒220的下表面在所述镜筒220的边缘处向下延伸形成第二固定结构222，所述镜筒220在所述第一固定结构221与所述第二固定结构222之间形成空腔，所述镜头210固定在所述第一固定结构221内。
应理解，一些诸如电容器、微控制单元(Microcontroller Unit，MCU)等被动元件可以设置于所述第一固定结构221与所述第二固定结构222之间形成的空腔内。
可选地，在所述第一固定结构221与所述第二固定结构222之间也可以存在固定结构，本申请实施例不做具体限定。
为了保证能够将镜头210稳定的固定在镜筒220内。可选地，在本申请一个实施例中，可以在所述第一固定结构221的上表面的筒口处设置用于阻止镜头210向上进行移动的结构。如图3所示，所述第一固定结构221的上表面在所述镜筒220的筒口处向内延伸形成第一凸起结构223，所述第一凸起结构223用于固定所述镜头210。可选地，在本申请的另一个实施例中，为了阻止所述镜头210向下移动，所述镜筒220的内侧表面和所述镜头210之间可以通过胶材贴合固定方式进行固定。
需要说明的是，所述第一固定结构221的上表面可以被设计成特定结构，例如漏斗结构或者斜面结构，以使得来自显示屏的经由人体手指反射的光信号尽可能多的穿过所述第一固定结构221，进而增加所述镜头210接收的信号量。例如，如图3所示，所述第一固定结构221的上表面在筒口处通过倒角处理形成有斜角，使得所述第一固定结构221在上表面处的内径大于所述第一固定结构221在所述第一凸起结构223处的内径。
可选地，在本申请一个实施例中，所述镜筒220的内侧表面和所述镜头210之间可以设置额外的用于容纳胶水的空间，以增加所述镜筒220的内侧表面和所述镜头210之间贴合的可靠度。例如，如图3所示，所述第一固定结构221的内侧表面在所述第一凸起结构223的下方形成有第一台阶结构224，所述镜头210通过所述第一凸起结构223和所述第一台阶结构224固定在所述第一固定结构221内。具体地，所述第一台阶结构224可以极大程度的增加胶水的容纳空间。
可选地，在本申请一个实施例中，可以在镜筒220的上表面设置泡棉，以到达密封防尘的目的。
可选地，在本申请另一个实施例中，可以将镜筒220与其固定组件进行 单独设计，即在模组装配之后，所述镜筒220具有固定的装配位置，此时，既能满足所述镜头210的成像条件，又能克服显示屏内部的结构光信号对手指的生物特征信息采集所造成的影响。具体地，如图6所示，可以通过镜座240支撑所述镜筒220，所述镜座240与所述镜筒220之间形成有点胶结构，所述镜座240与所述镜筒220之间通过在所述点胶结构内进行点胶的方式进行固定。例如，如图6所示，所述点胶结构可以包括所述镜座240的上表面在靠近所述镜筒220的外围区域向下延伸形成的第二台阶结构241，所述第二台阶结构241可以为胶水提供一个容纳空间，由此可以通过在所述第二台阶结构241提供的容纳空间内以点胶的方式固定连接所述镜筒220和所述镜座240。
应理解，所述第二台阶结构241可以包括一个或多个台阶，本申请实施例不做具体限定。
还应理解，所述第二台阶结构241围绕所述镜筒220可以是连续的也可以是离散的。本申请实施例不做具体限定。
可选地，在本申请一个实施例中，可以增强所述镜筒220与所述镜座240之间连接的可靠性。例如，如图6所示，所述镜座240的下表面在靠近所述镜筒220的外围区域向下延伸形成围绕固定所述镜筒220的第三固定结构242。且为了防止所述第三固定结构242可能对位于所述镜筒220下方诸如传感芯片230和光学滤波片240造成压迫，或者防止所述第三固定结构242可能对位于所述镜筒220下方诸如传感芯片230和光学滤波片240的装配造成影响，所述第三固定结构242的底部处于悬空状态。
应理解，所述第三固定结构242可以是连续的围绕固定所述镜筒220，也可以是离散的围绕固定所述镜筒220，本申请实施例不做具体限定。
可选地，在本申请一个实施例中，为了固定所述镜座240，所述镜座240的下表面在所述镜座240远离所述镜筒220的边缘处向下延伸形成第四固定结构243，其中，所述第四固定结构243的下延高度大于所述第三固定结构243的下延高度。具体地，所述第四固定结构243在某一方向上可以是连续的也可以是离散的，本申请实施例不做限定。
为了保证能够将镜头210稳定的固定在镜筒220内。可选地，在本申请一个实施例中，可以在镜筒220的上表面的筒口处设置用于阻止镜头210向上进行移动的结构。例如，如图6所示，所述镜筒220的上表面在筒口处向 内延伸形成第二凸起结构225，所述第二凸起结构225用于固定所述镜头。可选地，在本申请的另一个实施例中，为了阻止镜头210向下移动，镜筒220的内侧表面和镜头210之间可以通过胶材贴合固定方式进行固定。
可选地，在本申请一个实施例中，所述第二凸起结构225的上表面可以被设计成特定结构，例如漏斗结构或者斜面结构，以使得来自显示屏的经由人体手指反射的光信号尽可能多的穿过所述第二凸起结构225，进而增加镜头210接收的信号量。例如，图6所示，所述镜筒220的上表面在筒口处通过倒角处理形成有斜角，使得所述镜筒220在上表面处的内径大于所述镜筒220在所述第二凸起结构225处的内径。
可选地，在本申请一个实施例中，所述镜筒220的内侧表面和所述镜头210之间可以设置额外的用于容纳胶水的空间，以增加所述镜筒220的内侧表面和所述镜头210之间贴合的可靠度。例如，图6所示，所述镜筒220的内侧表面在所述第二凸起结构225的下方形成有第三台阶结构226，所述镜头210通过所述第二凸起结构225和所述第三台阶结构226固定在所述镜筒220内。具体地，所述第三台阶结构226可以极大程度的增加胶水的容纳空间。
可选地，在本申请一个实施例中，可以在镜座240的上表面设置泡棉，以到达密封防尘的目的。
应当理解的是，在具体实现上，所述镜头210、所述镜筒220以及所述镜座240还可以设计有其他结构。例如，所述镜头210还可以设计有镜头210的尺寸标记(a)，所述镜筒220还可以设计有镜筒220的尺寸标记(A1)，所述镜筒220还可以设计有装配尺寸，在模组装配过程中可以基于该装配尺寸进行镜筒220的装配。例如，不同的厂家可以使用不同的孔径和孔深(即镜筒220的筒径和筒深)。如图3所示的镜筒220还可以设计有用于固定所述镜筒220的孔，例如螺纹固定孔。如图6所示的镜座240还可以设计有用于固定所述镜座240的孔，例如螺纹固定孔。
图7和图8为本申请实施例的屏下生物特征识别装置200的示意图。其中图7是如图3所示的屏下生物特征识别装置200中还集成有光学滤波片250以及柔性印制电路板260的部分剖面结构示意图，图8是如图6所示的屏下生物特征识别装置200中还集成有光学滤波片250以及柔性印制电路板260的部分剖面结构示意图。
本申请实施例中，穿过所述镜头210的光信号在到达传感芯片230之前，还可以通过光学滤波器对其进行滤波，以滤除不需要的光。
可选地，在本申请一个实施例中，如图7和图8所示，屏下生物特征识别装置200还可以包括：光学滤波片250。所述光学滤波片250位于所述镜筒220和所述传感芯片230之间。
需要说明的是，所述光学滤波片250固定在所述传感芯片230的上表面，例如，所述光学滤波片250可以通过光学胶材固定在所述传感芯片230上。
可选地，如图7所示，所述光学滤波片250通过与所述镜筒220底部直接接触的方式至少覆盖所述第一固定结构221的下表面。
可选地，如图8所示，所述光学滤波片250通过与所述镜筒220底部直接接触的方式至少覆盖所述镜筒220的下表面。
应理解，所述光学滤波片250用来减少指纹感应中的不期望的背景光，以提高传感芯片230对接收到的光的光学感应。所述光学滤波片250具体可以用于过滤掉环境光波长，例如，近红外光和部分的红光等。又例如，蓝光或者部分蓝光。例如，人类手指吸收波长低于～580nm的光的能量中的大部分，如果一个或多个光学过滤器或光学过滤涂层可以设计为过滤波长从580nm至红外的光，则可以大大减少环境光对指纹感应中的光学检测的影响。
可选地，在本申请一个实施例中，所述光学滤光片250可以是红外截止光学滤波片和/或蓝光截止光学滤波片。
可选地，在本申请一个实施例中，所述光学滤光片250可以包括一个或多个光学过滤器，所述一个或多个光学过滤器可以配置为例如带通过滤器，以允许OLED像素发射的光的传输，同时阻挡太阳光中的红外光等其他光组分。当在室外使用所述屏下生物特征识别装置200时，这种光学过滤可以有效地减少由太阳光造成的背景光。所述一个或多个光学过滤器可以实现为例如光学过滤涂层，所述光学过滤涂层形成在一个或多个连续界面上，或可以实现为一个或多个离散的界面上。应理解，所述光学滤光片250可以制作在任何光学部件的表面上，或者沿着到经由手指反射形成的反射光至传感芯片230的光学路径上。
本申请实施例仅以所述光学滤光片250在传感芯片230的上表面上为例，但本申请不限于此。例如，所述光学滤光片250可以贴合在包括显示器 底面、镜头上/下表面、镜筒内或所述传感芯片230的内部等。
可选地，在本申请一个实施例中，屏下生物特征识别装置200还可以包括用于传输信号的电路板，如图7和图8所示，所述电路板可以是柔性印制电路板(Flexible Printed Circuit，FPC)260。
可选地，所述传感芯片230可以通过固晶胶固定在所述柔性印制电路板260的上表面，所述传感芯片230通过绑定线261电连接所述柔性印制电路板260。所述传感芯片230也可以通过焊盘焊接到所述柔性印制电路板260的上。具体地，所述传感芯片230可以通过所述柔性印制电路板260实现与其他外围电路或者如图1或图2所示的电子设备100的其他元件的电性互连和信号传输。比如，所述传感芯片230可以通过所述柔性印制电路板260接收所述电子设备100的处理单元的控制信号，并且还可以通过所述柔性印制电路板260将所述生物特征检测信号(例如指纹图像)输出给所述电子设备100的处理单元或者控制单元等。
可选地，如图7所示，所述第二固定结构222的下表面与所述柔性印制电路板260的上表面在所述传感芯片230的边缘区域固定连接。
可选地，如图8所示，所述第四固定结构243的下表面与所述柔性印制电路板260的上表面在所述传感芯片230的边缘区域固定连接。
具体地，所述镜筒220的所述第二固定结构222的下表面或者所述镜座240的所述第四固定结构243可以通过在所述柔性印制电路板260上点固定胶的方式实现密封粘结。例如，所述固定胶可以是属于环氧体系或者丙烯酸体系的胶，所述固定胶具有以下特性中的至少一种：不透可见光，厚度为0.02mm～0.10mm，粘度＞20000mPas，固化收缩率＜3％。所述固定胶的固化方式可以是85℃以内的低温固化，也可以是无影胶(Ultraviolet Rays，UV)固化，还可以是UV固化结合85℃以内的低温固化。
需要说明的是，UV固化原理是UV固化材料中的光引发剂(或光敏剂)在紫外线的照射下吸收紫外光后产生活性自由基或阳离子，引发单体聚合、交联化学反应，使粘合剂在数秒钟内由液态转化为固态。
如图7所示，由于镜筒220固定在所述柔性印制电路板260的上表面时，镜筒220和所述柔性印制电路板260之间会形成一个封闭的空间。如图8所示，由于镜座240固定在所述柔性印制电路板260的上表面时，镜座240和所述柔性印制电路板260之间会形成一个封闭的空间。为了避免由于这个封 闭空间的压强过大或过小影响屏下生物特征识别装置200的稳定性。
可选地，在本申请一个实施例中，可以在如图7所示的镜筒220上形成有排气孔，所述排气孔用于调整所述镜筒220和所述柔性印制电路板260形成的内部空间的气压强度。可以在如图8所示的镜座240上形成有排气孔，所述排气孔用于调整所述镜座240和所述柔性印制电路板260形成的内部空间的气压强度。
可选地，在本申请一个实施例中，屏下生物特征识别装置200还包括钢板，钢板固定在所述柔性印制电路板260的下表面。
可选地，在本申请一个实施例中，所述屏下生物特征识别装置还包括：固定架270。
具体地，如图9所示，所述镜筒220通过所述固定架270固定在所述显示屏的下方，并使得所述显示屏的上表面与所述镜头210光学中心之间的距离满足成像条件。如图10所示，所述镜座240通过所述固定架270固定在所述显示屏的下方，并使得所述显示屏的上表面与所述镜头210光学中心之间的距离满足成像条件。
可选地，所述固定架270与所述镜筒220之间，或者，所述固定架270与所述镜座240之间可以通过以下安装方式中的至少一种进行的安装固定：螺钉安装固定方式、胶材贴合固定方式、焊接固定方式和耦合固定方式。
本申请实施例中，所述屏下生物特征识别装置200可以通过固定连接在所述终端设备内部容易拆卸的器件上来实现安装在所述显示屏的下方。
换句话说，上述容易拆卸的器件可以作为所述屏下生物特征识别装置200与显示屏之间的固定架270。所述屏下生物特征识别装置200可以通过其他辅助元件实现以非接触方式固定设置在所述显示屏的下方。比如，所述屏下生物特征识别装置200可以固定到所述固定架270，并通过所述固定架270固定设置在所述显示屏的下方。
可选地，在本申请一个实施例中，当所述屏下生物特征识别装置200应用于终端设备(比如智能手机)时，所述固定架270为所述终端设备的中框，所述中框用于支撑所述显示屏。所述屏下生物特征识别装置200和所述显示屏之间可以通过所述终端设备的中框或者其他元部件固定在所述显示屏的下方。
图11是通过中框370将所述屏下生物特征识别装置200固定于显示屏 320下方的示意图。所述屏下生物特征识别装置200可以是如图3所示，也可以是如图6所示。以下以所述屏下生物特征识别装置200为如图6所示的屏下生物特征识别装置200为例进行阐述。
具体地，显示屏320可以为如图1和图2所示的OLED显示屏120，所述屏下生物特征识别装置200可以为如图1和图2所示的屏下生物特征识别装置140，其具体可以包括镜头210、镜筒220、传感芯片230、镜座240、光学滤波片250、柔性印制电路板260等等。所述屏下生物特征识别装置200可以用于采集指纹或者其他生物特征，且其生物特征采集区域至少部分位于所示显示屏320的显示区域之内。所述显示屏320和所述屏下生物特征识别装置200的具体结构、功能以及生物特征检测识别过程可以参照前面关于OLED显示屏120和屏下生物特征识别装置140的描述，此处不再赘述。
中框370为电子设备的设置于显示屏320和后盖中间并用于承载内部各种组件的框架，其内部各种组件包括但不限于电池，主板，摄像头，排线，各种感应器，话筒，听筒等等零部件。
中框370可以由金属或者合金材料制成，甚至可以由塑胶材料制成，这种情况下，所述中框370甚至可以和移动终端的边框一体成型，所述一体成型指内部中框和边框是一个整体。比如，边框可以只是一个金属贴边，或者可以在中框上面镀一层类似金属的涂料。进一步地，所述中框370还可以是复合中框，例如，包括内中框与外中框，其中，内中框用于承载手机零部件(例如镜座240)，外中框在内中框外，外中框外沿装有手机按键，内中框与外中框整合为一体。
可选地，在本申请一个实施例中，所述屏下生物特征识别装置200与所述显示屏320之间存在间隙。
应当理解，所述屏下生物特征识别装置200与所述显示屏320之间存在间隙旨在为了使得显示屏的上表面与镜头210光学中心之间的距离满足成像条件，本申请实施例对所述间隙的大小和具体含义不做限定。
例如，所述间隙可以是厂商在对所述生物识别装置200的安装过程中通过调试确定的，也可以是各个厂商规定好的。
又例如，所述间隙可以是镜筒220的上表面与所述显示屏320的下表面之间的距离，也可以是支架230的上表面与显示屏320的下表面之间的距离。
可选地，在本申请一个实施例中，所述屏下生物特征识别装置200与所 述显示屏320之间存在间隙的间隙宽度可以大于或等于第一距离，所述第一距离为所述终端设备处于跌落或者碰撞等震荡状态时所述镜筒220与所述显示屏320不会发生触碰的最小距离。
例如，所述间隙宽度的范围可以为：0.3mm-1mm。应注意，所述范围仅为所述间隙的示例范围，本申请实施例不限于此。
应当理解，虽然上述实施例中以所述中框370为固定架为例，但是，在其他实施例中，所述屏下生物特征识别装置200可以通过固定连接在所述终端设备内部容易拆卸的任意器件上来实现安装在所述显示屏320的下方，并保证所述屏下生物特征识别装置200与所述显示屏320之间存在间隙。只要所述屏下生物特征识别装置200能够以非接触方式固定设置在所述显示屏320的下方便可。在其他实施例中，所述屏下生物特征识别装置200也可以固定到所述移动终端的后盖、主板以及电池等易拆卸的器件上，进一步地固定设置在所述显示屏320的下方。
由于所述屏下生物特征识别装置200采用非接触方式设置在所述显示屏320的下方，且不和所述显示屏320的下表面接触，即，所述屏下生物特征识别装置200和所述显示屏320完全解耦，避免了拆卸所述屏下生物特征识别装置200时损坏所述显示屏320。
此外，由于所述屏下生物特征识别装置200和所述显示屏320的下表面不接触，二者之间保持一个固定的间隙，所述间隙可以是不填充任何辅助材料的空气间隙(air gap)，其可保证在当显示屏320受到按压或者终端设备出现跌落或碰撞时均不会出现所述屏下生物特征识别装置200接触到所述显示屏320的下表面，也不会影响所述屏下生物特征识别装置200的生物特征识别稳定性和性能。
综上所述，本申请实施例通过将所述屏下生物特征识别装置200与所述显示屏320的下表面进行分离设计，能够降低拆卸所述屏下生物特征识别装置200的难度，进而提高终端设备的可维修性。进一步地，能够降低在所述屏下生物特征识别装置的生产过程中将所述屏下生物特征识别装置200安装到所述显示屏320下方的复杂度，并提高所述屏下生物特征识别装置生产成功率，进而降低的生产成本。此外，也不会影响所述屏下生物特征识别装置200的生物特征识别稳定性和性能。
需要说明的是，本申请实施例中，所述显示屏320和所述中框370之间 的位置关系是相对固定的。
可选地，在本申请一个实施例中，如图11所示，在所述显示屏320与所述中框370之间还包括屏幕组件柔性电路板360，所述显示屏320可以通过所述屏幕组件柔性电路板360实现与其他外围电路或者如图1或图2所示的电子设备100的其他元件的电性互连和信号传输。
可选地，如图11所示，所述显示屏320与所述屏幕组件柔性电路板360之间设置有泡棉340，所述泡棉340通过光学胶330粘接所述显示屏320，所述泡棉340通过光学胶350粘接所述屏幕组件柔性电路板360。换句话说，所述屏幕组件柔性电路板360通过所述光学胶330、所述泡棉340和所述光学胶350固定在所述显示屏320的下方。
需要说明的是，上述泡棉340除了用于与所述光学胶330和所述光学胶350配合粘接所述屏幕组件柔性电路板360与所述显示屏320之外，还具有密封防尘的效果。
可选地，如图11所示，所述中框370与所述屏幕组件柔性电路板360之间通过泡棉380进行密封连接，所述泡棉380为至少一面背胶的可压缩泡棉。可选地，所述泡棉380的压缩率＞50％。在所述泡棉380两面都背胶时，与所述屏幕组件柔性电路板360粘接贴合的胶的黏性弱于与所述中框370粘接贴合的胶的黏性。
需要说明的是，上述泡棉380除了用于粘接所述屏幕组件柔性电路板360与所述中框370之外，还具有密封防尘的效果。在通过双面胶固定方式或者光学胶固定方式进行固定连接时，能够增加固定连接的稳定性。
可选地，如图11所示，所述屏下生物特征识别装置200的镜座240上设置有定位柱245，所述中框370上设置有定位孔371，所述定位柱245与所述定位孔371可以形成精准定位，同时，所述定位柱245与所述定位孔371之间通过双面胶390进行粘接，所述双面胶390为具有一定厚度和尺寸保持力的双面胶。
可选地，如图11所示，所述显示屏320与所述屏下生物特征识别装置200之间的各个叠层在所述屏下生物特征识别装置200的安装区域形成有开孔，所述屏下生物特征识别装置200设置于所述开孔的下方，且其光学感应阵列通过所述开孔与所述显示屏320的下表面正对设置。因此，当所述屏下生物特征识别装置200设置在所述中框370的下表面时，能够保证所述屏下 生物特征识别装置200可以透过所述开孔接收到上述反射光。
应理解，本申请实施例对所述开孔的尺寸不做具体限定。例如，所述中框370的开孔的尺寸可以小于或者等于所述屏下生物特征识别装置200的尺寸。又例如，所述中框370的开孔的尺寸也可以大于或等于镜筒220的尺寸。
可选地，在本申请的一个实施例中，在所述中框370的开孔的尺寸大于镜筒220的尺寸，且所述中框370的开孔371的尺寸小于所述屏下生物特征识别装置200的尺寸。这种情况下，镜筒220可以部分容纳在中框370的开孔内，且镜筒220和中框370之间可以形成有缓冲空间，其可以保证在当所述中框370受到按压或者终端设备出现跌落或碰撞时均不会出现镜筒220接触到中框370，也不会影响所述屏下生物特征识别装置200的生物特征识别稳定性和性能。
需要注意的是，所述显示屏320到所述中框370的距离构成所述屏下生物特征识别装置200的部分像距，在这一构成部分像距的距离范围内，所述显示屏320下的各个叠层结构物料开孔均不得遮挡有效光路，同时各叠层间形成良好的密封，避免对镜头造成污染(主要是指光信号污染)，从而，影响成像质量。
可选地，在本申请的一个实施例中，如图11所示，当所述屏下生物特征识别装置200应用于终端设备时，在所述显示屏320的上表面还设置有盖板310。其中，所述盖板310可以为透明保护盖板，比如玻璃盖板或者蓝宝石盖板，其可以覆盖在所述显示屏320，并且所述盖板310的下表面可以与所述显示屏320的上表面(即显示面)进行贴合。显示屏320与盖板310之间可以通过粘胶层连接，也可以通过其他连接方式连接，本申请实施例对此不做限定。
本申请实施例中，屏下生物特征识别装置200采用光学方式进行生物特征识别时，比如光学指纹识别时，所述屏下生物特征识别装置200需要检测所述显示屏320发出的光信号经过手指反射而形成的反射光。
实际产品中，如果所述中框370的厚度较厚，可选地，在本申请的一个实施例中，也可以对所述中框370上的所述屏下生物特征识别装置200的安装区域进行减薄处理。
通过以上分析可以发现，本申请实施例中，通过让屏下生物特征识别装置200和显示屏320分离设计，例如，屏下生物特征识别装置200可以固定 在中框370或后盖结构件上，解决目前屏下生物特征识别装置直接将屏下生物特征识别装置200贴合到显示屏320而导致的拆卸难，易损坏显示屏320，工艺贴合难度高等问题。
此外，本申请实施例中，所述屏下生物特征识别装置200和所述显示屏320的下表面之间形成一个间隙，所述间隙可保证在所述显示屏320受到按压或者当所述终端设备跌落或碰撞等条件下，所述屏下生物特征识别装置200均不接触所述显示屏320下表面，避免损坏所述显示屏320。
在本申请实施例中，上述屏下生物特征识别装置200也可以称为生物特征识别模组。光电探测器阵列也可以称为光电传感器阵列，其可以镜头220传输过来的光。例如，光电传感器阵列可以采用光电二极管的阵列，通过光电二极管将光信号转换为电信号，从而可以根据电信号进行成像。
图12是屏下生物特征识别装置200装配流程示意图。具体地，所述装配流程400包括：
410，被动元件贴片。
将电容器、MCU等被动元件固定在传感芯片230上，同时被动元件与传感芯片230电连接。
420，传感芯片贴合。
将传感芯片230通过固晶胶固定在柔性印制电路板260上。
430，光学滤光片贴合。
将光学滤光片250通过光学胶固定在传感芯片230上。
440，传感芯片邦定。
传感芯片230通过绑定线261电连接至柔性印制电路板260。
450，镜头组件贴合。
在如图3所述屏下生物特征识别装置200方案中，将镜头210安装在镜筒220内，以及将镜筒220的第二固定结构222通过固定胶固定在柔性印制电路板260上。
在如图6所述屏下生物特征识别装置200方案中，将镜头210安装在镜筒220内，固定连接镜座240与镜筒220，以及将镜座240的第四固定结构243通过固定胶固定在柔性印制电路板260上。
具体地，所述固定胶可以是属于环氧体系或者丙烯酸体系的胶，所述固定胶具有以下特性中的至少一种：不透可见光，厚度为0.02mm～0.10mm， 粘度＞20000mPas，固化收缩率＜3％。所述固定胶的固化方式可以是85℃以内的低温固化，也可以是UV固化，还可以是UV固化结合85℃以内的低温固化。
460，功能测试。
此时主要是进行所述屏下生物特征识别装置200的测试，例如，指纹检测测试。
470，模组表面贴双面胶。
上述模组为所述屏下生物特征识别装置200，在步骤450中测试合格时，在所述屏下生物特征识别装置200的镜筒(如图3所示方案)或者镜座(如图6所示方案)的上表面贴双面胶。
480，模组贴中框组件。
通过双面胶将所述屏下生物特征识别装置200的镜筒(如图3所示方案)或者镜座(如图6所示方案)与中框370(固定件270)固定。
490，功能测试。
此时进行的是全面测试，即整机测试，在测试合适时，装配流程完成。
本申请实施例中，还提供了一种生物特征识别组件，其可以包括屏下生物特征识别装置和模组支架；当所述生物特征识别组件应用到如上所述的屏下生物特征识别装置或者终端设备时，可以直接安装到所述终端设备的中框或者固定架，而在当所述屏下生物特征识别装置或者所述终端设备的屏下生物特征识别装置出现损坏时，可以对损坏的生物特征识别组件进行更换，因此能够进一步降低更换屏下生物特征识别装置的维修和器件更换的复杂度，避免对显示屏造成损坏。
本申请实施例还提供了一种电子设备，所述电子设备可以包括显示屏以及上述本申请各种实施例中的屏下生物特征识别装置，所述屏下生物特征识别装置设置在显示屏的下方，并使得显示屏的上表面与屏下生物特征识别装置中的镜头的光学中心之间的距离满足成像条件。
所述电子设备可以为任何具有显示屏的电子设备，其采用本申请实施例的技术方案实现屏下生物特征识别。所述显示屏可以为有机发光二极管显示屏，包括多个有机发光二极管光源，其中所述屏下生物特征识别装置采用至少部分有机发光二极管光源作为生物特征识别的激励光源。
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。
应理解，在本申请实施例和所附权利要求书中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请实施例。例如，在本申请实施例和所附权利要求书中所使用的单数形式的“一种”、“上述”和“所述”也旨在包括多数形式，除非上下文清楚地表示其他含义。
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，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。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。
在本申请所提供的几个实施例中，应所述理解到，所揭露的系统、装置，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另外，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，也可以是电的，机械的或其它的形式连接。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本申请实施例方案的目的。
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处理单元中，也可以是各个单元单独物理存在，也可以是两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分，或者所述技术方案的全部或部分可以以软件产品的形式体现出来，所述计算机软件产品存 储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
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，可轻易想到各种等效的修改或替换，这些修改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权利要求的保护范围为准。

Claims (43)

  1. 一种屏下生物特征识别装置，其特征在于，包括：
    镜头，设置在显示屏的下方，用于接收来自所述显示屏上方的经由人体手指反射形成的光信号，所述光信号用来检测所述手指的生物特征信息；
    镜筒，所述镜头固定在所述镜筒内；
    传感芯片，所述传感芯片设置在所述镜筒的下方，所述传感芯片用于基于穿过所述镜头的光信号进行成像，其中，所述传感芯片的感光面与所述镜头的成像面之间的距离大于或者等于预设值。
  2. 根据权利要求1所述的屏下生物特征识别装置，其特征在于，所述镜头的成像面位于所述传感芯片的感光面的上方或者下方。
  3. 根据权利要求1或2所述的屏下生物特征识别装置，其特征在于，所述预设值为10μm。
  4. 根据权利要求1至3中任一项所述的屏下生物特征识别装置，其特征在于，所述镜头包括由至少一片非球面注塑镜片组成的透镜。
  5. 根据权利要求1至4中任一项所述的屏下生物特征识别装置，其特征在于，所述镜头为微距镜头。
  6. 根据权利要求5所述的屏下生物特征识别装置，其特征在于，所述微距镜头的焦距范围为0.4mm-1.8mm。
  7. 根据权利要求1至6中任一项所述的屏下生物特征识别装置，其特征在于，所述镜筒的下表面在所述镜筒的筒口处向下延伸形成第一固定结构，所述镜筒的下表面在所述镜筒的边缘处向下延伸形成第二固定结构，所述镜筒在所述第一固定结构与所述第二固定结构之间形成空腔，所述镜头固定在所述第一固定结构内。
  8. 根据权利要求7所述的屏下生物特征识别装置，其特征在于，所述第一固定结构的上表面在所述镜筒的筒口处向内延伸形成第一凸起结构，所述第一凸起结构用于固定所述镜头。
  9. 根据权利要求8所述的屏下生物特征识别装置，其特征在于，所述第一固定结构的上表面在筒口处通过倒角处理形成有斜角，使得所述第一固定结构在上表面处的内径大于所述第一固定结构在所述第一凸起结构处的内径。
  10. 根据权利要求8或9所述的屏下生物特征识别装置，其特征在于， 所述第一固定结构的内侧表面在所述第一凸起结构的下方形成有第一台阶结构，所述镜头通过所述第一凸起结构和所述第一台阶结构固定在所述第一固定结构内。
  11. 根据权利要求7至10中任一项所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置还包括：
    光学滤波片，位于所述镜筒和所述传感芯片之间，其中，所述光学滤波片固定在所述传感芯片的上表面，且通过与所述镜筒底部直接接触的方式至少覆盖所述第一固定结构的下表面。
  12. 根据权利要求7至11中任一项所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置还包括：
    柔性印制电路板，所述传感芯片固定在所述柔性印制电路板的上表面，所述第二固定结构的下表面与所述柔性印制电路板的上表面在所述传感芯片的边缘区域固定连接。
  13. 根据权利要求12所述的屏下生物特征识别装置，其特征在于，所述镜筒通过在所述柔性印制电路板上点固定胶的方式实现密封粘结。
  14. 根据权利要求13所述的屏下生物特征识别装置，其特征在于，所述镜筒形成有排气孔，所述排气孔用于调整所述镜筒和所述柔性印制电路板形成的内部空间的气压强度。
  15. 根据权利要求7至14中任一项所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置还包括：
    固定架，所述镜筒通过所述固定架固定在所述显示屏的下方，并使得所述显示屏的上表面与所述镜头的光学中心之间的距离满足成像条件。
  16. 根据权利要求15所述的屏下生物特征识别装置，其特征在于，所述固定架与所述镜筒通过以下安装方式中的至少一种进行的安装固定：螺钉安装固定方式、胶材贴合固定方式、焊接固定方式和耦合固定方式。
  17. 根据权利要求1至6中任一项所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置还包括：
    镜座，所述镜座用于支撑所述镜筒。
  18. 根据权利要求17所述的屏下生物特征识别装置，其特征在于，所述镜座与所述镜筒之间形成有点胶结构，所述镜座与所述镜筒之间通过在所述点胶结构内进行点胶的方式进行固定。
  19. 根据权利要求18所述的屏下生物特征识别装置，其特征在于，所述点胶结构包括：所述镜座的上表面在靠近所述镜筒的外围区域向下延伸形成的第二台阶结构。
  20. 根据权利要求17至19中任一项所述的屏下生物特征识别装置，其特征在于，所述镜座的下表面在靠近所述镜筒的外围区域向下延伸形成围绕固定所述镜筒的第三固定结构，且所述第三固定结构的底部处于悬空状态。
  21. 根据权利要求20所述的屏下生物特征识别装置，其特征在于，所述镜座的下表面在所述镜座远离所述镜筒的边缘处向下延伸形成第四固定结构，其中，所述第四固定结构的下延高度大于所述第三固定结构的下延高度。
  22. 根据权利要求17至21中任一项所述的屏下生物特征识别装置，其特征在于，所述镜筒的上表面在筒口处向内延伸形成第二凸起结构，所述第二凸起结构用于固定所述镜头。
  23. 根据权利要求22所述的屏下生物特征识别装置，其特征在于，所述镜筒的上表面在筒口处通过倒角处理形成有斜角，使得所述镜筒在上表面处的内径大于所述镜筒在所述第二凸起结构处的内径。
  24. 根据权利要求22或23所述的屏下生物特征识别装置，其特征在于，所述镜筒的内侧表面在所述第二凸起结构的下方形成有第三台阶结构，所述镜头通过所述第二凸起结构和所述第三台阶结构固定在所述镜筒内。
  25. 根据权利要求17至24中任一项所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置还包括：
    光学滤波片，位于所述镜筒和所述传感芯片之间，其中，所述光学滤波片固定在所述传感芯片的上表面，且通过与所述镜筒底部直接接触的方式至少覆盖所述镜筒的下表面。
  26. 根据权利要求17至25中任一项所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置还包括：
    柔性印制电路板，所述传感芯片固定在所述柔性印制电路板的上表面，所述镜座的下表面与所述柔性印制电路板的上表面在所述传感芯片的边缘区域固定连接。
  27. 根据权利要求26所述的屏下生物特征识别装置，其特征在于，所述镜座通过在所述柔性印制电路板上点固定胶的方式实现密封粘结。
  28. 根据权利要求27所述的屏下生物特征识别装置，其特征在于，所述镜座形成有排气孔，所述排气孔用于调整所述镜座和所述柔性印制电路板形成的内部空间的气压强度。
  29. 根据权利要求17至28中任一项所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置还包括：
    固定架，所述镜座通过所述固定架固定在所述显示屏的下方，并使得所述显示屏的上表面与所述镜头光学中心之间的距离满足成像条件。
  30. 根据权利要求29所述的屏下生物特征识别装置，其特征在于，所述固定架与所述镜座通过以下安装方式中的至少一种进行的安装固定：螺钉安装固定方式、胶材贴合固定方式、焊接固定方式和耦合固定方式。
  31. 根据权利要求12、13、14、26、27或28所述的屏下生物特征识别装置，其特征在于，所述传感芯片通过固晶胶固定在所述柔性印制电路板的上表面，且所述传感芯片通过绑定线电连接所述柔性印制电路板。
  32. 根据权利要求13、14、27或28所述的屏下生物特征识别装置，其特征在于，所述固定胶具有以下特性中的至少一种：不透可见光，厚度为0.02mm～0.10mm，粘度＞20000mPas，固化收缩率＜3％。
  33. 根据权利要求11或25所述的屏下生物特征识别装置，其特征在于，所述光学滤波片为红外截止光学滤波片和/或蓝光截止光学滤光片。
  34. 根据权利要求11、25或33所述的屏下生物特征识别装置，其特征在于，所述光学滤波片通过光学胶材固定在所述传感芯片上。
  35. 根据权利要求15、16、29或30所述的屏下生物特征识别装置，其特征在于，所述屏下生物特征识别装置应用于电子设备，所述固定架为所述电子设备的中框，所述中框用于支撑所述显示屏。
  36. 根据权利要求35所述的屏下生物特征识别装置，其特征在于，所述中框形成有开孔，所述镜筒至少部分容纳在所述开孔内，所述镜筒外侧和所述开孔的内侧之间存在间隙。
  37. 根据权利要求36所述的屏下生物特征识别装置，其特征在于，所述中框的上表面在所述开孔边缘通过倒角处理形成有斜角，所述斜角使得所述中框上表面的开孔宽度大于所述中框下表面的开孔宽度。
  38. 一种电子设备，其特征在于，包括：
    权利要求1至37中任一项所述的屏下生物特征识别装置。
  39. 根据权利要求38所述的电子设备，其特征在于，所述电子设备还包括：
    显示屏，所述屏下生物特征识别装置设置在所述显示屏的下方，并使得所述显示屏的上表面与所述屏下生物特征识别装置中的镜头的光学中心之间的距离满足预定的成像条件，其中，所述屏下生物特征识别装置的生物特征采集区域至少部分位于所述显示屏的显示区域之中。
  40. 根据权利要求39所述的电子设备，其特征在于，所述电子设备还包括：中框，所述屏下生物特征识别装置通过所述中框装配至所述显示屏的下方，以使所述屏下生物特征识别装置与所述显示屏之间存在间隙。
  41. 根据权利要求40所述的电子设备，其特征在于，所述电子设备还包括屏幕组件柔性线路板，所述屏幕组件柔性线路板位于所述显示屏和所述中框之间，且所述屏幕组件柔性线路板与所述中框之间通过至少一面背胶的可压缩泡棉进行密封固定。
  42. 根据权利要求41所述的电子设备，其特征在于，若所述泡棉两面背胶，所述泡棉与所述屏幕组件柔性线路板粘结贴合的胶的粘性弱于所述泡棉与所述中框粘结贴合的胶的粘性。
  43. 根据权利要求41或42所述的电子设备，其特征在于，所述泡棉的压缩率＞50％。
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