WO2021097719A1 - 屏下指纹识别装置及系统、导光板组件和液晶显示屏幕 - Google Patents

屏下指纹识别装置及系统、导光板组件和液晶显示屏幕 Download PDF

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Publication number
WO2021097719A1
WO2021097719A1 PCT/CN2019/119755 CN2019119755W WO2021097719A1 WO 2021097719 A1 WO2021097719 A1 WO 2021097719A1 CN 2019119755 W CN2019119755 W CN 2019119755W WO 2021097719 A1 WO2021097719 A1 WO 2021097719A1
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WIPO (PCT)
Prior art keywords
light guide
guide plate
light
microstructure
screen
Prior art date
Application number
PCT/CN2019/119755
Other languages
English (en)
French (fr)
Inventor
青小刚
李顺展
曾红林
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2019/119755 priority Critical patent/WO2021097719A1/zh
Priority to CN201980004398.7A priority patent/CN111095058B/zh
Publication of WO2021097719A1 publication Critical patent/WO2021097719A1/zh

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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

Definitions

  • OLED Organic Light-Emitting Diode
  • LCD Organic Light-Emitting Diode
  • the liquid crystal display screen includes a backlight module and a display module located above the backlight module.
  • the optical film of the backlight module includes a reflective film, a light guide plate, a uniform light film, and a light-increasing film stacked from bottom to top. Bright film, the role of each layer of the film is different.
  • the backlight module provides uniform visible light through the backlight belt, and the visible light is processed by the optical film of the backlight module to uniformly distribute the visible light to form a surface light source to illuminate the display module of the liquid crystal display screen to display the image.
  • the optical film in the backlight module is based on polyester resin (Polyethylene terephthalate, abbreviated as: PET). Except for the light guide plate which is slightly thicker, other films are thinner (such as reflective film and homogenizing film), which is easier When deformation occurs, the two diaphragms are prone to uneven contact, which is easy to cause film interference. Since the fingerprint sensor in the fingerprint recognition module under the screen can receive the interference lines in the film interference, it will interfere with the effect of fingerprint recognition.
  • PET Polyethylene terephthalate
  • the present application provides an under-screen fingerprint identification device and system, a light guide plate assembly and a liquid crystal display screen, which help eliminate the phenomenon of film interference between the light guide plate and the film layer adjacent to the light guide plate.
  • the present application provides an under-screen fingerprint identification device suitable for electronic equipment with a liquid crystal display screen, and the fingerprint identification area of the under-screen fingerprint identification device is at least partially located in the display area of the liquid crystal display screen;
  • the under-screen fingerprint identification device includes a fingerprint identification module located below the backlight module of the liquid crystal display screen, and the fingerprint identification module is configured to receive a fingerprint identification module formed by a finger above the fingerprint identification area and pass through the The fingerprint detection light of the liquid crystal display screen to obtain the fingerprint image of the finger;
  • the backlight module includes a light guide plate assembly
  • the light guide plate assembly includes a light guide plate and a microstructure located on the surface of the light guide plate and guiding light to the backlight of the liquid crystal display screen, wherein the light guide plate
  • the component is used to isolate the deformation area of the backlight module and the adjacent film layer of the light guide plate from the light guide plate by increasing the height of the microstructure, so as to prevent the fingerprint detection light from passing through the light guide plate. Film interference occurs when the light guide plate assembly.
  • the under-screen fingerprint identification device includes a detection light source, and the detection light source is used to emit detection light to a finger located above the fingerprint identification area, and the detection light irradiates the Fingers above the fingerprint identification area form the fingerprint detection light carrying fingerprint information.
  • the detection light or the fingerprint detection light and the backlight provided by the backlight module for displaying images have different wavelengths.
  • the detection light and the fingerprint detection light are both infrared light, and the backlight provided by the backlight module is visible light.
  • the deformation area of the adjacent film layer of the light guide plate is located on the side of the backlight module close to the fingerprint recognition area, wherein the deformation area of the adjacent film layer of the light guide plate is The deformation in the region is the deformation of the film material adjacent to the light guide plate concave toward the light guide plate.
  • the microstructures are located on the upper surface and the lower surface of the light guide plate, and the microstructures are used to support the film material adjacent to the light guide plate in the backlight module. , So that the deformation area of the film layer adjacent to the light guide plate in the backlight module is isolated from the light guide plate.
  • the microstructure includes two light guide structures with different structures, and the light guide structure is used to guide the backlight.
  • the microstructure includes a first microstructure and a second microstructure, wherein the first microstructure is located on the lower surface of the light guide plate and is used to support the backlight mold Set of reflective films, the second microstructure is located on the upper surface of the light guide plate and used to support the uniform light film of the backlight module.
  • the first microstructure is used to disperse the backlight totally reflected in the light guide plate, so that the backlight emits light from the front of the liquid crystal display screen;
  • the second microstructure is used to guide the backlight in the light guide plate while increasing the brightness of the backlight.
  • the height of the first microstructure is inversely proportional to the density of the transmission area of the first microstructure on the light guide plate, wherein the transmission area is the guide plate.
  • the light plate is used to transmit the fingerprint detection light.
  • the density of the first microstructure in the transmission area is less than the density of the first microstructure in the backlight guide area of the light guide plate, or the transmission area is Blank structure.
  • the first microstructure is a light guide point, and the height of the first microstructure is 4.5um-5um.
  • the light guide plate assembly is also used to increase the distance between the second microstructures to isolate the light guide plate from the deformed area of the light uniform film.
  • the second microstructures are uniformly arranged on the upper surface of the light guide plate along a straight line, and the surface of the second microstructures is an arc structure.
  • the radius of curvature of the second microstructure is 40um
  • the height of the second microstructure is 2um-5um
  • the spacing between the second microstructures is 70um- 90um.
  • the detection light and the fingerprint detection light are both infrared light with a wavelength of 940 nm.
  • the present application provides a light guide plate assembly suitable for liquid crystal display screens supporting under-screen fingerprint recognition.
  • the light guide plate assembly includes a light guide plate and a backlight on the surface of the light guide plate and facing the liquid crystal display screen.
  • a microstructure for light guide wherein the light guide plate assembly is used to isolate the deformed area of the liquid crystal display screen and the adjacent film layer of the light guide plate from the light guide plate by increasing the height of the microstructure , To prevent the fingerprint detection light received by the under-screen optical fingerprint identification device from causing film interference when passing through the light guide plate assembly.
  • the deformation area of the adjacent film layer of the light guide plate is located on the side of the backlight module of the liquid crystal display screen close to the fingerprint recognition area, wherein the light guide plate is adjacent
  • the deformation in the deformation area of the film layer is the deformation of the film material adjacent to the light guide plate concave toward the light guide plate.
  • the microstructures are located on the upper surface and the lower surface of the light guide plate, and the microstructures are used to support the film material adjacent to the light guide plate in the backlight module. , So that the deformation area of the film layer adjacent to the light guide plate in the backlight module is isolated from the light guide plate.
  • the microstructure includes two light guide structures with different structures, and the light guide structure is used to guide the backlight.
  • the microstructure includes a first microstructure and a second microstructure, wherein the first microstructure is located on the lower surface of the light guide plate and is used to support the backlight mold Set of reflective films, the second microstructure is located on the upper surface of the light guide plate and used to support the uniform light film of the backlight module;
  • the first microstructure is used to disperse the backlight that is totally reflected in the light guide plate, so that the backlight emits light from the front of the liquid crystal display screen;
  • the second microstructure is used to disperse the backlight from the front of the liquid crystal display screen;
  • the backlight in the light plate guides light while increasing the brightness of the backlight.
  • the height of the first microstructure is inversely proportional to the density of the transmission area of the first microstructure on the light guide plate, wherein the transmission area is the guide plate.
  • the light plate is used to transmit the fingerprint detection light received by the fingerprint recognition module of the under-screen optical fingerprint recognition device.
  • the density of the first microstructure in the transmission area is less than the density of the first microstructure in the backlight guide area of the light guide plate, or the transmission area is Blank structure.
  • the first microstructure is a light guide point, and the height of the first microstructure is 4.5um-5um.
  • the light guide plate assembly is also used to increase the distance between the second microstructures to isolate the light guide plate from the deformed area of the light uniform film.
  • the second microstructures are uniformly arranged on the upper surface of the light guide plate along a straight line, and the surface of the second microstructures is an arc structure.
  • the radius of curvature of the second microstructure is 40um
  • the height of the second microstructure is 2um-5um
  • the spacing between the second microstructures is 70um- 90um.
  • the detection light emitted by the under-screen optical fingerprint identification device and the fingerprint detection light received by the fingerprint identification module in the under-screen optical fingerprint identification device are both with a wavelength of 940 nm. Infrared light.
  • the present application provides a liquid crystal display fingerprint identification system, which includes a liquid crystal display screen and the under-screen fingerprint identification device as described in any one of the above, the liquid crystal display screen includes a display module and is located in the display module The backlight module underneath, the backlight module is located above the fingerprint recognition module of the fingerprint recognition device; wherein, the backlight module includes the light guide plate assembly as described above.
  • the present application provides a liquid crystal display screen that supports an under-screen fingerprint recognition function, which includes a display module and a backlight module.
  • the backlight module is provided under the display module for providing The liquid display module provides backlight, and transmits the fingerprint detection light formed by the finger above the liquid crystal display screen to the fingerprint recognition module under the backlight module, wherein the backlight module includes any of the above The light guide plate assembly.
  • This application provides an under-screen fingerprint identification device and system, a light guide plate assembly, and a liquid crystal display screen.
  • the backlight module and the deformation area of the adjacent film layer of the light guide plate are increased It is isolated from the light guide plate to avoid film interference when the fingerprint detection light passes through the light guide plate assembly, so as to realize the fingerprint recognition function under the screen while avoiding the two diaphragms caused by the deformation of the optical diaphragm of the backlight module
  • the uneven contact interferes with the fingerprint recognition effect, thereby solving the problem of uneven contact between the two diaphragms of the existing backlight module and the interference of the fingerprint recognition effect caused by the film interference phenomenon.
  • Figure 1 is a schematic diagram of the structure of an existing liquid crystal display indicating and identifying system
  • FIG. 2 is a schematic diagram of the structure of the existing light guide plate assembly
  • FIG. 3 is a schematic diagram of the structure of the existing reflective film in contact with the light guide plate
  • FIG. 4 is a schematic diagram of parameters of a second microstructure on a conventional light guide plate
  • FIG. 5 is a schematic diagram of the structure of the existing uniform light film contacting the light guide plate
  • FIG. 6 is a schematic diagram of the positional relationship between the reflective film and the light guide plate after the first microstructure on the light guide plate is heightened according to the first embodiment of the present application;
  • FIG. 7 is a schematic diagram of parameters of the second microstructure on the light guide plate provided in Embodiment 1 of the present application.
  • FIG. 8 is a schematic diagram of the positional relationship between the uniform light film and the light guide plate provided in the first embodiment of the present application;
  • FIG. 9 is a schematic diagram of the relationship between the light guide plate assembly provided in Embodiment 1 of the present application.
  • LCD screen-10 display module-11; display area-111; non-display area-112; backlight module-12; reflective film-121; light guide plate assembly-122; light guide plate-1221; first microstructure- 1222; second microstructure-1223; transmission area-1224; backlight guide area-1225; uniform light film-123; brightness enhancement film-124; steel plate-125; deformation area-126; spacing-L; radius of curvature-R; The height of the second microstructure-H; under-screen fingerprint identification device-20; detection light source-21; fingerprint identification module-22; optical element-221; fingerprint sensor-222.
  • the optical film of the backlight module 12 includes a reflective film 121, a light guide plate 1221, a uniform light film 123, and a brightness enhancement film 124 stacked from bottom to top.
  • the role of each layer of the diaphragm is different.
  • the optical film in the backlight module 12 is based on the PET material.
  • the optical film in the backlight module 12 is slightly thicker except for the light guide plate 1221, and other films are thinner, such as the reflective film 121 and the light uniform film 123, which are more prone to deformation. It is prone to uneven contact between the two films, which is likely to cause film interference.
  • the thickness of the reflective film 121 in the backlight module 12 is 80um
  • the thickness of the light guide plate 1221 is about 450um
  • the thickness of the uniform film 123 is 50um.
  • the thickness of the bright film 124 is 70um.
  • the fingerprint sensor 222 in the fingerprint identification module 22 under the screen can receive the interference pattern in the film interference, it will interfere with the effect of fingerprint identification.
  • the present application provides an under-screen fingerprint recognition device and system, a light guide plate assembly, and a liquid crystal display screen, which can eliminate or reduce the thin film interference phenomenon between the light guide plate 1221 and the reflective film 121 and the uniform light film 123.
  • the embodiments of the present application provide an under-screen fingerprint identification device and system, a light guide plate assembly, and a liquid crystal display screen.
  • the under-screen fingerprint identification device 20 is suitable for electronic equipment with a liquid crystal display screen 10, and the electronic equipment may include but is not limited to Electronic products or components such as mobile phones, tablet computers, televisions, notebook computers, digital photo frames, navigators, fingerprint locks, etc., which adopt the LCD screen 10.
  • the electronic equipment includes a liquid crystal display screen 10, an under-screen fingerprint identification device 20 provided in an embodiment of the present application, and a light guide plate assembly 122.
  • an application scenario of a mobile phone using a liquid crystal display screen 10 is taken as an example to further explain the under-screen fingerprint identification device 20, the light guide plate assembly 122, the liquid crystal display fingerprint identification system, and the liquid crystal display screen 10 of the present application.
  • FIG. 6 is a schematic diagram of the positional relationship between the reflective film and the light guide plate after the first microstructure on the light guide plate provided in the first embodiment of the present application
  • FIG. 7 is the parameter of the second microstructure on the light guide plate provided in the first embodiment of the present application
  • FIG. 8 is a schematic diagram of the positional relationship between the uniform light film and the light guide plate provided in the first embodiment of the present application
  • FIG. 9 is a schematic diagram of the relationship between the light guide plate assembly provided in the first embodiment of the present application.
  • an embodiment of the present application provides an under-screen fingerprint identification device 20, which is suitable for electronic equipment with a liquid crystal display screen 10.
  • the fingerprint identification area of the under-screen fingerprint identification device 20 (not marked in the figure) ) At least partly located in the display area 111 of the liquid crystal display screen 10 to increase the area of the display area 111 on the liquid crystal display screen 10, so as to obtain a better user experience.
  • the display area 111 of the liquid crystal display screen 10 is an area used for displaying images on the liquid crystal display screen 10 or a mobile phone.
  • the fingerprint recognition area may specifically be an area for the user to press with a finger to implement a fingerprint input operation.
  • the under-screen fingerprint recognition device 20 includes a fingerprint recognition module 22 located below the backlight module 12 of the liquid crystal display screen 10.
  • the fingerprint recognition module 22 is used to receive the fingerprint recognition area formed by the finger above the fingerprint recognition area and pass through the liquid crystal display screen 10. Fingerprint detection light to obtain the fingerprint image of the finger.
  • the backlight module 12 includes a light guide plate assembly 122.
  • the light guide plate assembly 122 includes a light guide plate 1221 and a microstructure on the surface of the light guide plate 1221 that guides the backlight of the liquid crystal display screen 10.
  • the light guide plate assembly 122 is used for By increasing the height of the microstructures, the deformation area 126 of the adjacent film layer of the backlight module 12 and the light guide plate 1221 is isolated from the light guide plate 1221 to avoid film interference when the fingerprint detection light passes through the light guide plate assembly 122.
  • the light guide plate assembly 122 may be an integrated structure.
  • the light guide plate 1221 and the microstructure may be an integrated structure formed by injection molding or other integral molding methods.
  • the light guide plate 1221 and the microstructure can be made of one or more materials (such as PEF) that have a guiding effect on the backlight of the liquid crystal display screen 10 (such as visible light).
  • PEF photoelectric field
  • the backlight module 12 may include an optical film assembly and a steel plate 125 located under the optical film assembly and supporting the optical film assembly.
  • the optical film layer assembly may specifically include a light guide plate assembly 122, a uniform light film 123 and a brightness enhancement film 124 located on the light exit surface (ie, the top surface) of the light guide plate assembly 122, and a reflective film 121 located on the bottom surface of the light guide plate 1221.
  • the backlight module 12 may further include a backlight light source (not labeled in the figure), and the backlight light source may be specifically arranged on one of the sides of the light guide plate assembly 122, that is, the side of the light guide plate assembly 122 facing the backlight light source as a light incident surface.
  • the light guide plate assembly 122 is mainly used to receive the backlight provided by the backlight light source through the light incident surface, and convert the backlight into uniform flat light and emit it from the light exit surface;
  • the reflective film 121 is mainly used to emit light from the bottom surface of the light guide plate assembly 122 The backlight is reflected back to the light guide plate assembly 122;
  • the uniform light film 123 and the brightness enhancement film 124 are respectively used to perform uniform light diffusion and brightness enhancement treatment on the planar light emitted from the light exit surface of the light guide plate assembly 122.
  • the steel plate 125 is mainly used to support and protect other optical films of the backlight module 12.
  • the optical film layer of the backlight module 12 is based on PET material, and the homogenizing film 123 and the reflective film 121 are relatively thin, they are prone to deformation, so that the reflective film 121 or the homogenizing film 123 is easily deformed.
  • the deformed area 126 (that is, the area where the deformation occurs on the side facing the light guide plate assembly 122) contacts the light guide plate 1221 unevenly.
  • the unevenness of the deformation area 126 of the reflective film 121 or the uniform light film 123 in contact with the light guide plate 1221 may be that the reflective film 121 or the uniform light film 123 in the deformation area 126 has a different contact degree with the light guide plate 1221, resulting in the reflective film in the deformation area 126.
  • 121 or the uniform light film 123 and the light guide plate 1221 have gaps of different degrees at the periphery of the contact point.
  • the existing microstructure on the light guide plate 1221 can affect the reflective film 121 or The uniform light film 123 plays a supporting role, but the existing microstructure on the light guide plate 1221 does not support the reflective film 121 or the uniform light film 123 enough, so that the deformation area 126 of the reflective film 121 or the uniform light film 123 will still be in contact with each other.
  • the light guide plate 1221 has uneven contact.
  • the fingerprint identification module 22 Since the fingerprint identification module 22 receives the fingerprint detection light that passes through the entire liquid crystal display screen 10 and carries fingerprint information, it realizes the reading of the fingerprint image. Therefore, when the fingerprint detection light passes through the deformation area 126 of the backlight module 12, since the deformation area 126 of the reflective film 121 and/or the uniform light film 123 contacts the light guide plate 1221 unevenly, the fingerprint detection light is in the deformation area 126. The reflection and transmission phenomena interfere with each other, so that thin film interference occurs between the light guide plate 1221 and its adjacent film layers (such as the reflective film 121 and the light homogenizing film 123), and the fingerprint sensor 222 in the fingerprint recognition module 22 can receive the film.
  • the interference pattern (such as Newton's ring or other interference pattern) that interferes with fingerprint imaging will cause a certain degree of interference to the effect of fingerprint recognition.
  • the fingerprint sensor 222 may receive Newton's rings or other interference patterns (such as fringe interference patterns), so that the fingerprint image is covered by Newton's rings or other interference patterns, thereby affecting the acquisition or recognition of the fingerprint image.
  • the fingerprint sensor 222 will also receive Newton’s rings or other interference patterns while receiving the fingerprint detection light carrying fingerprint information. Since the fingerprint sensor 222 receives the fingerprint information carried on the fingerprint detection light, it will perform a certain algorithm. The fingerprint information is processed to form fingerprint imaging, so the Newton's ring or other interference patterns received by the fingerprint sensor 222 will interfere with the fingerprint imaging process to a certain extent, thereby affecting the effect of fingerprint recognition.
  • Newton's rings or other interference patterns belong to a kind of film interference phenomenon.
  • Newton's rings are concentric rings of light and dark, which are an interference pattern of light.
  • Newton’s ring is a typical interference pattern of equal thickness, that is, the thickness of the air film at the same radius of the ring is the same, and the reflected optical path difference between the upper and lower surfaces is the same, so that the formation conditions of the Newton’s ring are better than other interference patterns (such as fringe interference patterns) The formation conditions of) are relatively harsh.
  • the present application increases the height of the microstructure on the light guide plate 1221, so that the microstructure has a better supporting effect on the reflective film 121 and the uniform light film 123, so that even the reflective film 121 and the homogenizing film 123 are deformed and unable to contact the light guide plate 1221, that is, so that the deformation area 126 (that is, the reflective film 121 and the homogenizing film 123) of the adjacent film layer of the backlight module 12 and the light guide plate 1221 and the light guide plate 1221 isolation, so as to avoid Newton's ring or other interference pattern generation conditions, to avoid film interference when fingerprint detection light passes through the light guide plate assembly 122, thereby eliminating the film interference that may be caused by the deformation of the reflective film 121 and the homogenizing film 123 phenomenon.
  • the present application realizes the under-screen fingerprint recognition function, it can avoid the uneven contact between the two films caused by the deformation of the optical film of the backlight module 12, which interferes with the fingerprint recognition effect, thereby solving the problem of the existing backlight module.
  • the two diaphragms of group 12 are not in uniform contact, which causes the interference problem of the fingerprint recognition effect caused by the film interference phenomenon.
  • the under-screen fingerprint identification device 20 may further include a detection light source 21, which is used to emit detection light to the finger located above the fingerprint identification area, and the detection light irradiates the fingerprint identification The finger above the area is reflected or transmitted by the finger to form a fingerprint detection light carrying fingerprint information.
  • the fingerprint detection light further passes through the liquid crystal display screen 10 and returns to the fingerprint identification module 22.
  • the area of the backlight module 12 is a transparent area through which the fingerprint detection light can pass (not marked in the figure)
  • the light-transmitting area may specifically be the area corresponding to the transmission path of the detection light from the detection light source 21 and the fingerprint detection light formed on the finger on the liquid crystal display screen 10, and its transmission band covers the emission band of the detection light source 21, so that the detection The light and the fingerprint detection light formed on the finger can penetrate the light-transmitting area of the backlight module 12.
  • the fingerprint identification module 22 is located under the light-transmitting area of the liquid crystal display screen 10 to receive the fingerprint detection light returned through the light-transmitting area of the backlight module 12, and can obtain the fingerprint of the finger according to the fingerprint information carried by the fingerprint detection light image.
  • the detection light source 21 may be located below the backlight module 12 and arranged close to the fingerprint identification module 22 or integrated in the fingerprint identification module 22.
  • the detection light source 21 can also be arranged in the non-display area 111 of the liquid crystal display screen 10 together with the backlight light source of the backlight module 12.
  • the detection light source 21 can also be arranged in other positions.
  • the position of the detection light source 21 is not further limited, and it is only necessary to ensure that the detection light emitted by the detection light source 21 can illuminate the fingerprint recognition of the display module 11.
  • the finger above the area and the fingerprint detection light formed by the reflection or transmission of the finger can pass through the light-transmitting area (not marked in the figure) of the backlight module 12 and enter the fingerprint identification module 22.
  • the wavelength of the detection light or fingerprint detection light is different from that of the backlight provided by the backlight module 12 for displaying images, that is,
  • the detection light source 21 may specifically be a light source with a different wavelength band from the backlight provided by the backlight module 12, which may be used to emit a specific wavelength of detection light, and the specific wavelength of the detection light is used for the fingerprint recognition module 22 to perform under-screen optics.
  • Fingerprint detection the detection light of a specific waveband may be invisible light outside the visible light waveband, such as infrared light.
  • the backlight provided by the backlight module 12 may be visible light, and the detection light and fingerprint detection light may be infrared light or other light signals with wavelengths outside the visible light band and capable of fingerprint recognition.
  • the detection light may include but is not limited to infrared light.
  • the fingerprint identification module 22 of the embodiment of the present application can not only use the fingerprint detection light passing through the backlight module 12 to achieve under-screen optical fingerprint detection, but also reduce the display effect of the detection light emitted by the detection light source 21 on the liquid crystal display screen 10. Cause interference to avoid affecting the display effect of the image.
  • the detection light source 21 may be an infrared light source such as an infrared lamp, an infrared Vertical Cavity Surface Emitting Laser (VCSEL for short), and an infrared laser diode (Laser Diode).
  • an infrared light source such as an infrared lamp, an infrared Vertical Cavity Surface Emitting Laser (VCSEL for short), and an infrared laser diode (Laser Diode).
  • the spectral range of the detection light emitted by the detection light source 21 may be 780 nm-1100 nm. Preferably, it may be infrared light with a wavelength of 940 nm. In this way, the different characteristics of visible light and infrared light in the various backlight film materials of the backlight module 12 can be used to ensure that the fingerprint detection light carrying fingerprint information is less distorted during the transmission process of the backlight module 12, and the accuracy of fingerprint recognition is high. .
  • the infrared light emitted by the detection light source 21 as the detection light, since the penetration ability of infrared light is stronger than that of visible light, it can more effectively enhance the fingerprint detection light that penetrates the liquid crystal display screen 10 and its various backlight films. Signal to improve the fingerprint recognition effect.
  • the fingerprint recognition module 22 may include an optical element 221, a filter (not marked in the figure), and a fingerprint sensor 222, where the filter is located between the optical element 221 and the fingerprint sensor 222.
  • the optical element 221 faces the side of the backlight module 12, and the optical element 221 is used to enable the fingerprint detection light passing through the backlight module 12 to be guided by the optical path of the optical element 221 or optically converge and enter the fingerprint sensor 222 to realize the optical of the fingerprint image.
  • Imaging The fingerprint sensor 222 may also be referred to as an optical sensor, an image sensor, an optical fingerprint sensor 222, an optical sensor or a fingerprint detection sensor, etc. It may specifically include an optical imaging chip, or an optical imaging chip with a certain optical stack.
  • the filter filters other infrared light or interference light outside the wavelength band of the fingerprint detection light, so as to eliminate the interference caused by the above-mentioned light entering the fingerprint sensor 222 to fingerprint recognition, thereby improving the effect of fingerprint recognition.
  • the optical filter may be located above the fingerprint sensor 222, or may be directly formed on the optical sensing array or the optical path guiding structure of the fingerprint sensor 222 by coating.
  • the filter includes but is not limited to an infrared cut filter (IR-Cut Filter, IRCF for short).
  • the optical element 221 may include a macro lens with at least one spherical or aspheric lens and a physical component for carrying the macro lens.
  • the fingerprint sensor 222 and the filter above it may be located in the converging light path of the macro lens to achieve Fingerprint optical imaging.
  • the following embodiments of the present application take infrared light with a wavelength of 940 nm as an example to further illustrate the light guide plate assembly 122 in the embodiments of the present application.
  • the detection light emitted by the under-screen optical fingerprint identification device and the fingerprint detection light received by the fingerprint identification module 22 in the under-screen optical fingerprint identification device are both infrared light with a wavelength of 940 nm.
  • an embodiment of the present application provides a light guide plate assembly 122, which is suitable for a liquid crystal display screen 10 supporting under-screen fingerprint recognition.
  • the light guide plate assembly 122 includes a light guide plate 1221 and a light guide plate 1221 located on the surface of the light guide plate 1221.
  • the backlight of the liquid crystal display screen 10 has a microstructure for guiding light.
  • the height of the microstructure on the light guide plate 1221 is increased, so that the deformation area of the adjacent film layer of the backlight module 12 and the light guide plate 1221 is increased.
  • the deformation area 126 of the adjacent film layer of the light guide plate 1221 is located on the side of the backlight module 12 close to the fingerprint recognition area, wherein the deformation in the deformation area 126 of the adjacent film layer of the light guide plate 1221 is the same as
  • the film material adjacent to the light guide plate 1221 recesses the deformation of the light guide plate 1221 (as shown in FIGS. 3 and 5). Therefore, when the film material adjacent to the light guide plate 1221 is deformed, the deformation area 126 thereof is concave to the light guide plate 1221 to create conditions for film interference with the light guide plate 1221.
  • the microstructures are located on the upper surface and the lower surface of the light guide plate 1221, and the microstructures are used to support the film material adjacent to the light guide plate 1221 in the backlight module 12, In this way, the deformation area 126 of the film layer adjacent to the backlight module 12 and the light guide plate 1221 is isolated from the light guide plate 1221.
  • the microstructure on the light guide plate 1221 can better guide the backlight (visible light), and convert the backlight into a uniform plane light to illuminate the liquid crystal display screen 10.
  • the microstructure includes two light guide structures with different structures, and the light guide structure is used to guide the backlight.
  • the microstructure includes a first microstructure 1222 and a second microstructure 1223, wherein the first microstructure 1222 is located on the lower surface of the light guide plate 1221 and is used to support the reflective film 121 of the backlight module 12, and the second microstructure 1223 is located The upper surface of the light guide plate 1221 is used to support the uniform light film 123 of the backlight module 12.
  • the first microstructure 1222 and the second microstructure 1223 can support the reflective film 121 and the light homogenizing film 123 to a certain extent, and the deformation area 126 of the reflective film 121 and the light homogenizing film 123 It is isolated from the light guide plate 1221.
  • the first microstructure 1222 is used to disperse the backlight totally reflected by the reflective film 121 in the light guide plate 1221, so that the backlight emits light from the front of the liquid crystal display screen 10;
  • the second microstructure 1223 is used to guide the backlight in the light guide plate 1221 Increase the brightness of the backlight while light.
  • the light guide plate assembly 122 converts the backlight into uniform plane light to illuminate the liquid crystal display screen 10 for display on the liquid crystal display screen 10.
  • the height of the first microstructure 1222 is inversely proportional to the density of the first microstructure 1222 in the transmission area 1224 on the light guide plate 1221, that is, the higher the density of the first microstructure 1222 in the transmission area 1224 is Larger, the smaller the height of the first microstructure 1222. Conversely, when the density of the first microstructure 1222 in the transmission area 1224 is smaller, the height of the first microstructure 1222 is greater. Among them, referring to FIG.
  • the transmission area 1224 is the area on the light guide plate 1221 used to transmit the fingerprint detection light, that is, the transmission area 1224 is mainly used for the fingerprint detection light that carries fingerprint information formed on the finger. Smoothly pass through the light guide plate 1221 and enter the fingerprint recognition module 22 to realize fingerprint recognition, avoiding that the fingerprint detection light carrying fingerprint information is affected by the light guide of the light guide plate 1221 and cannot enter the fingerprint recognition module 22 normally, which will cause the fingerprint image to be distorted .
  • the fingerprint recognition module 22 may be at least partially located vertically below the transmission area 1224 of the light guide plate 1221203.
  • the backlight strip is close to the side of the light guide plate 1221 (that is, the light-incident surface) and is set close to the fingerprint recognition area, considering that the backlight has a certain loss during the transmission process, in order to make the display effect of the liquid crystal display screen 10 have a certain uniformity (That is, the display brightness is basically the same).
  • the first microstructures 1222 are unevenly distributed on the light guide plate 1221 (as shown in FIG. 2, in the direction away from the backlight light source, the first microstructures 1222 are The density gradually increases).
  • the density of the first microstructures 1222 in the transmission area 1224 is less than the density of the first microstructures 1222 in the backlight guide area 1225 of the light guide plate 1221, or the transmission area 1224 is a blank structure, that is, the transmission area 1224 is not provided with the first microstructure.
  • the structure 1222 (as shown in FIG. 2) is used to increase the transmittance of the fingerprint detection light carrying fingerprint information in the transmission area 1224.
  • the backlight guide area 1225 is used to convert the visible light provided by the backlight light source into planar light emitted from the light-emitting surface of the light guide plate 1221 close to the display module 11 to illuminate the display module 11 and ensure that the backlight module 12 can be normal Provide backlight.
  • the display effect of the liquid crystal display screen 10 may be affected to a certain extent (the display may be partially excessive or too dark). Therefore, in the embodiment of the present application, the height of the first microstructure 1222 is increased to isolate the deformation area 126 (the reflective film 121 and the uniform light film 123) of the adjacent film layer of the backlight module 12 and the light guide plate 1221 from the light guide plate 1221.
  • the first microstructure 1222 may be a light guide point, which is also called a light guide mesh point.
  • the light guide point may be plastic particles, particles with high reflection for the backlight, or other Realize the small particles that change the light and diffuse the light to various angles, that is, in this embodiment, the light guide point includes but is not limited to plastic particles.
  • the height of the first microstructure 1222 is 4.5um-5um.
  • the height of the first microstructure 1222 is less than 4.5um, the support strength for the reflective film 121 is insufficient, and the deformed area 126 of the reflective film 121 may contact the light guide plate 1221 unevenly.
  • the height of the first microstructure 1222 is greater than 5um, The first microstructure 1222 may be displayed on the liquid crystal display screen 10. Therefore, while isolating the deformation area 126 of the reflective film 121 from the light guide plate 1221, the display effect of the liquid crystal display screen 10 should be ensured.
  • the first microstructure 1222 The height of is limited to the above range, and when the height of the first microstructure 1222 is within the above range, the distance L between the deformed region 126 of the reflective film 121 and the light guide plate 1221 is greater than half of the wavelength of the detection light (for example, 940 nm) At this time, when the probe light is irradiated into the deformed area 126, the projection and reflection of the probe light will interfere less, thereby effectively avoiding the occurrence of film interference.
  • the uniform light film 123 has a thickness of 50 um, it is easily deformed, and the contact surface with the light guide plate assembly 122 is smooth, which also causes the problem of film interference.
  • the light guide plate assembly 122 is also used to increase the distance L between the second microstructures 1223 to make the deformation area of the light guide plate 1221 and the uniform light film 123 126 is isolated, thereby destroying the condition of thin film interference between the light guide plate 1221 and the deformed area 126 of the uniform light film 123.
  • the second microstructures 1223 are uniformly arranged on the upper surface of the light guide plate 1221 along a straight line, and the surface of the second microstructures 1223 is an arc structure.
  • the radius of curvature R of the second microstructure 1223 is 40um
  • the height H of the second microstructure is 1um
  • the spacing L is generally 40um.
  • the height H of the second microstructure is It is 2um-5um, such as 3um and 4um
  • the distance L between the second microstructures 1223 is 70um-90um, such as 80um.
  • the display effect of the liquid crystal display screen 10 should be ensured, and the height H and the spacing L of the second microstructure should be limited within the above range, and in the current position
  • the distance L between the deformation area 126 of the homogenizing film 123 and the light guide plate 1221 is greater than half of the wavelength of the detection light (such as 940 nm).
  • the detection light is irradiated to When in the deformed area 126, the projection and reflection of the probe light have less interference, thereby effectively avoiding the occurrence of film interference.
  • the second microstructure 1223 may be an arc-shaped light-guiding structure with light-guiding performance for the backlight.
  • the arc-shaped light-guiding structure may be made of plastic or a material with high reflection for the backlight. It may be combined with the first microstructure 1222 and the light-guiding structure.
  • the light plate 1221 is made of the same material through injection molding or other integral forming processes. In this embodiment, the material of the second microstructure 1223 is not further limited.
  • the present application provides an under-screen fingerprint identification device, which isolates the deformed area of the backlight module and the adjacent film layer of the light guide plate from the light guide plate by increasing the height of the microstructure on the light guide plate, so as to prevent fingerprint detection light from passing through.
  • Film interference occurs when passing through the light guide plate assembly, so that while the under-screen fingerprint recognition function is realized, the problem of interference with the fingerprint recognition effect due to the deformation of the optical film of the backlight module can be avoided.
  • the embodiment of the present application provides a liquid crystal display fingerprint identification system, which includes a liquid crystal display screen 10 and an under-screen fingerprint identification device 20 as in the first embodiment.
  • the liquid crystal display screen 10 includes a display module 11 and the backlight module 12 located under the display module 11, the backlight module 12 is located on the fingerprint recognition module 22 of the fingerprint recognition device; wherein, the backlight module 12 includes the light guide plate assembly 122 in the above embodiment.
  • the liquid crystal display screen 10 generally includes a backlight module 12 under the display module 11.
  • the fingerprint identification module 22 is located under the backlight module 12.
  • the backlight module 12 is formed with a light-transmitting area for the fingerprint detection light to pass through.
  • the light area may refer to the light-transmitting area formed by the optical film component of the backlight module 12 in the transmission path of the detection light and the fingerprint detection light in relation to the wavelength band of the fingerprint detection light.
  • the fingerprint recognition module 22 is located in the transparent area of the backlight module 12. Under the light area, the fingerprint detection light is transmitted to the fingerprint identification module 22 through the backlight module 12.
  • the relative position between the detection light source, the light transmission area of the backlight module, and the fingerprint recognition module can be adjusted as needed, but the adjusted detection light source 21 and the backlight module
  • the relative position between the light-transmitting area and the fingerprint recognition module must meet the requirement that the detection light emitted by the detection light source 21 can illuminate the finger above the fingerprint recognition area, and the fingerprint detection light formed by the reflection or transmission of the finger can pass through the backlight module.
  • the light-transmitting area of the group 12 enters the fingerprint recognition module 22.
  • the detection light source 21 is used to emit detection light to the finger above the fingerprint recognition area, and the detection light irradiates the finger above the fingerprint recognition area and reflects the finger or After transmission, a fingerprint detection light carrying fingerprint information is formed, and the fingerprint identification module 22 is used to receive the fingerprint detection light carrying the fingerprint information through the liquid crystal display screen 10 to obtain the fingerprint image of the finger.
  • the backlight module 12 includes the light guide plate assembly 122 as described above. Specifically, in this embodiment, reference may be made to the description of the light guide plate assembly 122 in Embodiment 1. In this embodiment, the light guide plate assembly 122 will not be further described.
  • This application provides a liquid crystal display screen that supports fingerprint recognition under the screen.
  • the deformation area of the backlight module and the adjacent film layer of the light guide plate is isolated from the light guide plate to avoid When the fingerprint detection light passes through the light guide plate assembly, film interference occurs, thereby avoiding the interference problem of the fingerprint recognition effect due to the deformation of the optical film of the backlight module.

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Abstract

本申请提供一种屏下指纹识别装置及系统、导光板组件和液晶显示屏幕，屏下指纹识别装置，应用于具有液晶显示屏幕的电子设备，屏下指纹识别装置包括位于液晶显示屏幕的背光模组下方的指纹识别模组，背光模组包括导光板组件，其中，所述导光板组件用于通过增大位于其表面的微结构的高度使背光模组中和导光板相邻膜层的变形区域与导光板隔离，以避免指纹检测光在透过导光板组件时发生薄膜干涉，有助于消除导光板和与导光板相邻的膜层之间发生薄膜干涉现象。

Description

屏下指纹识别装置及系统、导光板组件和液晶显示屏幕 技术领域
本申请涉及生物识别技术领域，尤其涉及一种屏下指纹识别装置及系统、导光板组件和液晶显示屏幕。
背景技术
有机发光二极管(OrganicLight-Emitting Diode，简称：OLED)可以控制单独像素点的亮灭，采用OLED屏幕手机的光学屏下指纹识别技术已经进入商用时代。采用液晶显示屏幕(Liquid Crystal Display，简称：LCD)电子设备(如手机)的光学屏下指纹识别技术正在向商用化推进。
目前，液晶显示屏幕包括背光模组和位于背光模组上方的显示模组，一般情况下，背光模组的光学膜片包括自下而上堆叠设置的反射膜、导光板、匀光膜和增亮膜，各层膜片的作用不同。背光模组通过背光灯带提供均匀的可见光，可见光通过背光模组的光学膜片的处理后使得可见光均匀分布形成面光源，以照亮液晶显示屏幕的显示模组，从而进行画面的显示。
然而，背光模组中的光学膜片采用涤纶树脂(Polyethylene terephthalate，简称：PET)材料为基础，除导光板稍微厚一些，其它膜片厚度较薄(比如反射膜和匀光膜)，比较容易发生形变，容易出现两个膜片接触不均匀的情况，这样容易引发薄膜干涉现象。由于屏下指纹识别模组中的指纹传感器能够接收到薄膜干涉中的干扰纹路，进而会对指纹识别的效果造成干扰。
发明内容
本申请提供一种屏下指纹识别装置及系统、导光板组件和液晶显示屏幕，有助于消除导光板和与导光板相邻的膜层之间发生薄膜干涉现象。
第一方面，本申请提供一种屏下指纹识别装置，适用于具有液晶显示屏幕的电子设备，所述屏下指纹识别装置的指纹识别区域至少部分位于所述液晶显示屏幕的显示区域；
所述屏下指纹识别装置包括位于所述液晶显示屏幕的背光模组下方的指纹识别模组，所述指纹识别模组用于接收经所述指纹识别区域上方的手指形成的并透过所述液晶显示屏幕的指纹检测光，以获取所述手指的指纹图像；
其中，所述背光模组包括导光板组件，所述导光板组件包括导光板和位于所述导光板表面的且对所述液晶显示屏幕的背光进行导光的微结构，其中，所述导光板组件用于通过增大所述微结构的高度使所述背光模组中和所述导光板相邻膜层的变形区域与所述导光板隔离，以避免所述指纹检测光在透过所述导光板组件时发生薄膜干涉。
在本申请的一种具体实施例中，所述屏下指纹识别装置包括检测光源，所述检测光源用于向位于所述指纹识别区域上方的手指发射探测光，所述探测光照射到所述指纹识别区域上方的手指并形成携带有指纹信息的所述指纹检测光。
在本申请的一种具体实施例中，所述探测光或者所述指纹检测光与所述背光模组提供的用于显示画面的所述背光的波长不同。
在本申请的一种具体实施例中，所述探测光和所述指纹检测光均为红外光，所述背光模组提供的所述背光为可见光。
在本申请的一种具体实施例中，所述导光板相邻膜层的变形区域位于所述背光模组靠近所述指纹识别区域的一侧，其中，所述导光板相邻膜层的变形区域内的变形为与所述导光板相邻的膜材凹向所述导光板的形变。
在本申请的一种具体实施例中，所述微结构位于所述导光板的上表面和下表面，所述微结构用于支撑所述背光模组中与所述导光板相邻的膜材，以使所述背光模组中和所述导光板相邻膜层的变形区域与所述导光板隔离。
在本申请的一种具体实施例中，所述微结构包括两种不同结构的导光结构，所述导光结构用于对所述背光进行引导。
在本申请的一种具体实施例中，所述微结构包括第一微结构和第二微结构，其中，所述第一微结构位于所述导光板的下表面且用于支撑所述背光模组的反射膜，所述第二微结构位于所述导光板的上表面且用于支撑所述背光模组的匀光膜。
在本申请的一种具体实施例中，所述第一微结构用于将所述导光板内 全反射的所述背光打散，以使所述背光从所述液晶显示屏幕的正面发光；所述第二微结构用于对所述导光板内的所述背光进行导光的同时增加所述背光的亮度。
在本申请的一种具体实施例中，所述第一微结构的高度与所述第一微结构在所述导光板上的透射区域的密度成反比，其中，所述透射区域为所述导光板上用于使所述指纹检测光透过的区域。
在本申请的一种具体实施例中，所述第一微结构在所述透射区域内的密度小于所述第一微结构在所述导光板的背光引导区域的密度，或者所述透射区域为空白结构。
在本申请的一种具体实施例中，所述第一微结构为导光点，且所述第一微结构的高度为4.5um-5um。
在本申请的一种具体实施例中，所述导光板组件还用于通过增大所述第二微结构之间的间距，以使所述导光板和所述匀光膜的变形区域隔离。
在本申请的一种具体实施例中，所述第二微结构沿直线均匀排布在所述导光板的上表面，且所述第二微结构的表面为弧形结构。
在本申请的一种具体实施例中，所述第二微结构的曲率半径为40um时，所述第二微结构的高度为2um-5um，所述第二微结构之间的间距为70um-90um。
在本申请的一种具体实施例中，所述探测光和所述指纹检测光均为波长为940nm的红外光。
第二方面，本申请提供一种导光板组件，适用于支持屏下指纹识别功能的液晶显示屏幕，述导光板组件包括导光板和位于所述导光板表面的且对所述液晶显示屏幕的背光进行导光的微结构，其中，所述导光板组件用于通过增大所述微结构的高度使所述液晶显示屏幕中和所述导光板相邻膜层的变形区域与所述导光板隔离，以避免被屏下光学指纹识别装置接收的指纹检测光在透过所述导光板组件时发生薄膜干涉。
在本申请的一种具体实施例中，所述导光板相邻膜层的变形区域位于所述液晶显示屏幕的背光模组靠近所述指纹识别区域的一侧，其中，所述导光板相邻膜层的变形区域内的变形为与所述导光板相邻的膜材凹向所述导光板的形变。
在本申请的一种具体实施例中，所述微结构位于所述导光板的上表面和下表面，所述微结构用于支撑所述背光模组中与所述导光板相邻的膜材，以使所述背光模组中和所述导光板相邻膜层的变形区域与所述导光板隔离。
在本申请的一种具体实施例中，所述微结构包括两种不同结构的导光结构，所述导光结构用于对所述背光进行引导。
在本申请的一种具体实施例中，所述微结构包括第一微结构和第二微结构，其中，所述第一微结构位于所述导光板的下表面且用于支撑所述背光模组的反射膜，所述第二微结构位于所述导光板的上表面且用于支撑所述背光模组的匀光膜；
所述第一微结构用于将所述导光板内全反射的所述背光打散，以使所述背光从所述液晶显示屏幕的正面发光；所述第二微结构用于对所述导光板内的所述背光进行导光的同时增加所述背光的亮度。
在本申请的一种具体实施例中，所述第一微结构的高度与所述第一微结构在所述导光板上的透射区域的密度成反比，其中，所述透射区域为所述导光板上用于使被所述屏下光学指纹识别装置的指纹识别模组接收的指纹检测光透过的区域。
在本申请的一种具体实施例中，所述第一微结构在所述透射区域内的密度小于所述第一微结构在所述导光板的背光引导区域的密度，或者所述透射区域为空白结构。
在本申请的一种具体实施例中，所述第一微结构为导光点，且所述第一微结构的高度为4.5um-5um。
在本申请的一种具体实施例中，所述导光板组件还用于通过增大所述第二微结构之间的间距，以使所述导光板和所述匀光膜的变形区域隔离。
在本申请的一种具体实施例中，所述第二微结构沿直线均匀排布在所述导光板的上表面，且所述第二微结构的表面为弧形结构。
在本申请的一种具体实施例中，所述第二微结构的曲率半径为40um时，所述第二微结构的高度为2um-5um，所述第二微结构之间的间距为70um-90um。
在本申请的一种具体实施例中，所述屏下光学指纹识别装置的发射的探测光和所述屏下光学指纹识别装置中的指纹识别模组接收的指纹检测光 均为波长为940nm的红外光。
第三方面，本申请提供一种液晶显示屏指纹识别系统，包括液晶显示屏幕和如上任一项所述的屏下指纹识别装置，所述液晶显示屏幕包括显示模组和位于所述显示模组之下的背光模组，所述背光模组位于所述指纹识别装置的指纹识别模组之上；其中，所述背光模组包括如上所述的导光板组件。
第四方面，本申请提供一种支持屏下指纹识别功能的液晶显示屏幕，其包括显示模组和背光模组，所述背光模组设在所述显示模组之下，用于为所述液显示模组提供背光，并将在所述液晶显示屏幕上方的手指形成的指纹检测光传输至所述背光模组之下的指纹识别模组，其中所述背光模组包括如上任一项所述的导光板组件。
本申请提供一种屏下指纹识别装置及系统、导光板组件和液晶显示屏幕，通过增大导光板上的微结构的高度，使背光模组中和所述导光板相邻膜层的变形区域与导光板隔离，以避免指纹检测光在透过导光板组件时发生薄膜干涉，从而在实现屏下指纹识别功能的同时，能够避免由于背光模组的光学膜片的变形引发的两个膜片接触不均匀，对指纹识别效果的干扰，进而解决了现有背光模组的两个膜片接触不均匀，导致的薄膜干涉现象对指纹识别效果的干扰问题。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为现有的液晶显示屏指示识别系统的结构示意图；
图2为现有的导光板组件的结构示意图；
图3是现有反射膜接触导光板的结构示意图；
图4是现有的导光板上的第二微结构的参数示意图；
图5是现有匀光膜接触导光板的结构示意图；
图6是本申请实施例一提供的导光板上的第一微结构加高后反射膜与导 光板位置关系示意图；
图7是本申请实施例一提供的导光板上的第二微结构的参数示意图；
图8是本申请实施例一提供的匀光膜与导光板位置关系示意图；
图9是本申请实施例一提供的导光板组件的关系示意图。
附图标记说明：
液晶显示屏幕-10；显示模组-11；显示区域-111；非显示区域-112；背光模组-12；反射膜-121；导光板组件-122；导光板-1221；第一微结构-1222；第二微结构-1223；透射区域-1224；背光引导区域-1225；匀光膜-123；增亮膜-124；钢板-125；变形区域-126；间距-L；曲率半径-R；第二微结构的高度-H；屏下指纹识别装置-20；检测光源-21；指纹识别模组-22；光学元件-221；指纹传感器-222。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
下面以具体地实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
正如背景技术中所描述的，参考图1至图5所示，背光模组12的光学膜片包括自下而上堆叠设置的反射膜121、导光板1221、匀光膜123和增亮膜124，各层膜片的作用不同。然而，背光模组12中的光学膜片PET材料为基础。然而，参考图3和图5所示，背光模组12中的光学膜片除导光板1221稍微厚一些，其它膜片厚度较薄，比如反射膜121和匀光膜123，比较容易发生形变，容易出现两个膜片接触不均匀的情况，这样容易引发薄膜干涉现象，比如，背光模组12中反射膜121的厚度为80um，导光板1221厚度450um左右，匀光膜123厚度为50um，增亮膜124厚度为70um。
由于屏下指纹识别模组22中的指纹传感器222能够接收到薄膜干涉中的干扰纹路，进而会对指纹识别的效果造成干扰。
为此，本申请提供一种屏下指纹识别装置及系统、导光板组件和液晶显示屏幕，能够消除或者减轻导光板1221与反射膜121和匀光膜123之间发生薄膜干涉现象。
本申请实施例提供一种屏下指纹识别装置及系统、导光板组件和液晶显示屏幕，其中，屏下指纹识别装置20适用于具有液晶显示屏幕10的电子设备，其中电子设备可以包括但不限于采用液晶显示屏幕10的手机、平板电脑、电视机、笔记本电脑、数码相框、导航仪、指纹锁等电子产品或部件。电子设备包括液晶显示屏幕10、本申请实施例提供的屏下指纹识别装置20和导光板组件122。
下面本申请实施例以采用液晶显示屏幕10的手机的应用场景为例，对本申请的屏下指纹识别装置20、导光板组件122、液晶显示指纹识别系统和液晶显示屏幕10做进一步阐述。
实施例一
图6是本申请实施例一提供的导光板上的第一微结构加高后反射膜与导光板位置关系示意图，图7是本申请实施例一提供的导光板上的第二微结构的参数示意图，图8是本申请实施例一提供的匀光膜与导光板位置关系示意图，图9是本申请实施例一提供的导光板组件的关系示意图。
参考图6至图9所示，本申请实施例提供一种屏下指纹识别装置20，适用于具有液晶显示屏幕10的电子设备，屏下指纹识别装置20的指纹识别区域(在图中未标示)至少部分位于液晶显示屏幕10的显示区域111，以增大液晶显示屏幕10上显示区域111的面积，从而获得较好的用户体验度。其中，液晶显示屏幕10的显示区域111为液晶显示屏幕10或者手机上用于显示画面的区域。指纹识别区域可以具体为供用户进行手指按压以实现指纹输入操作的区域。
屏下指纹识别装置20包括位于液晶显示屏幕10的背光模组12下方的指纹识别模组22，指纹识别模组22用于接收经指纹识别区域上方的手指形成的并透过液晶显示屏幕10的指纹检测光，以获取手指的指纹图像。
其中，背光模组12包括导光板组件122，导光板组件122包括导光板1221和位于导光板1221表面的且对液晶显示屏幕10的背光进行导光的微结构，其中，导光板组件122用于通过增大微结构的高度使背光模组12中和导光板1221相邻膜层的变形区域126与导光板1221隔离，以避免指纹检测光在透过导光板组件122时发生薄膜干涉。
具体的，本实施例中，导光板组件122可以为一体化结构。其中，本实施例中，导光板1221和微结构可以通过注塑或者其他一体成形的方式形成的一体化结构。其中，导光板1221和微结构可以采用一种或几种对液晶显示屏幕10的背光(比如可见光)具有引导作用的材料制备而成(比如PEF)，在本实施例中，对于导光板组件122的具体形成方式和材料并不做进一步限定。
参考图1所示，背光模组12可以包括光学膜层组件和位于光学膜层组件下方且对光学膜层组件起到支撑作用的钢板125。其中，光学膜层组件具体可以包括导光板组件122、位于导光板组件122的出光面(即顶面)的匀光膜123和增亮膜124、位于导光板1221的底面的反射膜121。另外，背光模组12还可以包括背光光源(在图中未标示)，背光光源可以具体设置在导光板组件122的其中一个侧面，即导光板组件122朝向背光光源的侧面作为入光面。其中，导光板组件122主要用于通过入光面接收背光光源的提供的背光，并将背光转换为均匀平面光并从其出光面出射；反射膜121主要用于将从导光板组件122底面出射的背光反射回导光板组件122；匀光膜123和增亮膜124分别用于对导光板组件122的出光面出射的平面光进行匀光扩散以及增亮处理。钢板125主要用于对背光模组12的其他光学膜片进行支撑保护。正如背景技术中所描述的，由于背光模组12的光学膜层采用PET材料为基础，且匀光膜123和反射膜121较薄，容易发生变形，从而使得反射膜121或者匀光膜123的变形区域126(即朝向导光板组件122的一侧发生形变的区域)接触导光板1221不均匀。其中，反射膜121或者匀光膜123的变形区域126接触导光板1221不均匀可以为变形区域126内反射膜121或者匀光膜123与导光板1221的接触程度不同，导致变形区域126内反射膜121或者匀光膜123与导光板1221在接触点的外围出现不同程度的间隙。
具体的，参考图1至图5所示，当反射膜121或者匀光膜123在朝向 导光板1221的一侧发生形变时，虽然现有的导光板1221上的微结构能够对反射膜121或者匀光膜123起到支撑作用，但是现有的导光板1221上的微结构对于反射膜121或者匀光膜123的支撑度不够，使得反射膜121或者匀光膜123的变形区域126仍会与导光板1221出现不均匀的接触。
由于指纹识别模组22通过接收透过整个液晶显示屏幕10的且携带有指纹信息的指纹检测光，来实现指纹图像的读取。所以当指纹检测光透过该背光模组12的变形区域126时，由于反射膜121和/或匀光膜123的变形区域126接触导光板1221不均匀，指纹检测光在该变形区域126内的反射和透射现象相互干扰，使得导光板1221与其相邻的膜层之间(比如反射膜121和匀光膜123)会发生薄膜干涉，而指纹识别模组22中的指纹传感器222能够接收到薄膜干涉中的对指纹成像具有干扰的纹路(比如牛顿环或者其他干扰纹路)，进而会对指纹识别的效果造成一定程度的干扰。
比如，指纹传感器222会接收到牛顿环或者其他干扰纹路(比如条纹干扰纹路)，使得指纹图像被牛顿环或者其他干扰纹路覆盖，从而影响指纹图像的获取或者识别。或者，指纹传感器222在接收携带有指纹信息的指纹检测光的同时也会接收到牛顿环或者其他干扰纹路，由于指纹传感器222在接收到指纹检测光上携带的指纹信息后，按照一定的算法对指纹信息进行处理从而形成指纹成像，所以指纹传感器222接受到的牛顿环或者其他干扰纹路会对上指纹成像过程产生一定的干扰，从而影响指纹识别的效果。
需要说明的是，牛顿环或者其他干扰纹路均属于一种薄膜干涉现象。牛顿环是一些明暗相间的同心圆环，为光的一种干涉图样。牛顿环是典型的等厚薄膜干涉，即同一半径的圆环处空气膜厚度相同，上、下表面反射光程差相同，使得牛顿环的形成条件较本申请的其他干扰纹路(比如条纹干扰纹路)的形成条件较为苛刻。
为此，参考图6至图8所示，本申请通过增大导光板1221上微结构的高度，使得微结构对反射膜121和匀光膜123起到更好的支撑效果，达到即使反射膜121和匀光膜123变形也无法接触到导光板1221的目的，即以使背光模组12和导光板1221相邻膜层的变形区域126(即反射膜121和匀光膜123)与导光板1221隔离，从而规避掉牛顿环或者其他干扰纹路产生的条件， 以避免指纹检测光在透过导光板组件122时发生薄膜干涉，从而消除反射膜121和匀光膜123由于变形可能引发的薄膜干涉现象。因此，本申请实现屏下指纹识别功能的同时，能够避免由于背光模组12的光学膜片的变形引发的两个膜片接触不均匀，对指纹识别效果的干扰，进而解决了现有背光模组12的两个膜片接触不均匀，导致的薄膜干涉现象对指纹识别效果的干扰问题。
具体的，本实施例中，参考图1所示，屏下指纹识别装置20还可以包括检测光源21，检测光源21用于向位于指纹识别区域上方的手指发射探测光，探测光照射到指纹识别区域上方的手指并手指反射或者透射之后形成携带有指纹信息的指纹检测光。指纹检测光进一步穿过液晶显示屏幕10返回到指纹识别模组22。为保证携带有指纹信息的指纹检测光可以穿过液晶显示屏幕10，在本实施例中，背光模组12的至少部分区域为可透过指纹检测光的透光区域(在图中未标示)，透光区域可以具体为检测光源21的探测光及其在手指形成的指纹检测光在液晶显示屏幕10的传输路径所对应的区域，且其透射波段覆盖检测光源21的发射波段，以使探测光及其在手指形成的指纹检测光可以穿透背光模组12的透光区域。指纹识别模组22位于液晶显示屏幕10的透光区域之下，以便接收穿过背光模组12的透光区域返回的指纹检测光，并可以根据指纹检测光携带的指纹信息获取到手指的指纹图像。
作为一种可能的实现方式，本实施例中，检测光源21可以位于背光模组12的下方，并靠近指纹识别模组22设置或者集成在指纹识别模组22内部。或者，本实施例中，检测光源21还可以与背光模组12的背光光源一起设置在液晶显示屏幕10的非显示区域111。或者，检测光源21也可以设置在其他位置，在本实施例中，对于检测光源21的位置并不做进一步限定，只需保证检测光源21发射的探测光能够照射到显示模组11的指纹识别区域上方的手指，且经手指反射或透射形成的指纹检测光能够透过背光模组12的透光区域(在图中未标示)进入指纹识别模组22即可。
为了避免检测光源21发出的探测光对液晶显示屏幕10的显示效果造成干扰，本实施例中，探测光或者指纹检测光与背光模组12提供的用于显示画面的背光的波长不同，也就是说，检测光源21可以具体为与背光模组12提供的背光具有不同波段的光源，其可以用于发射特定波段的探测光，特定 波段的探测光用于供指纹识别模组22进行屏下光学指纹检测。其中，特定波段的探测光可以为位于可见光波段之外的不可见光，比如红外光。
示例性的，本实施例中，背光模组12提供的背光可以为可见光，探测光和指纹检测光可以为红外光或其他波长位于可见光的波段之外且能够实现指纹识别的光信号，在本实施例中，探测光可以包括但不仅限于红外光。这样用户通过显示模组11无法看到或察觉上述用于指纹识别的探测光。因此，本申请实施例的指纹识别模组22不仅能够利用穿过背光模组12的指纹检测光实现屏下光学指纹检测，而且还能降低检测光源21发出的探测光液晶显示屏幕10的显示效果造成干扰，避免对图像的显示效果产生影响。
具体的，检测光源21可以为红外灯、红外的垂直腔面发射激光器(Vertical Cavity Surface Emitting Laser，简称VCSEL)、红外的激光二极管(Laser Diode)等红外光源。
其中，本实施例中，检测光源21的发出探测光的光谱范围可以为780nm-1100nm。优选地，可以为波长为940nm的红外光。这样利用可见光和红外光在背光模组12的各类背光膜材中不同的特性，可以保证携带有指纹信息的指纹检测光在背光模组12的传输过程中失真小，确保指纹识别准确性高。另一方面，利用检测光源21发出的红外光来作为探测光，由于红外光的穿透能力比可见光强，可以更有效地增强穿透液晶显示屏幕10及其各个背光膜材的指纹检测光的信号，提高指纹识别效果。
具体的，本实施例中，指纹识别模组22可以包括光学元件221、滤光片(在图中未标示)和指纹传感器222，其中，滤光片位于光学元件221和指纹传感器222之间，光学元件221朝向背光模组12的一侧，光学元件221用于使得透过背光模组12的指纹检测光可以经过光学元件221的光路引导或者光学汇聚并进入指纹传感器222以实现指纹图像的光学成像。指纹传感器222也可以称为光学传感器、图像传感器、光学指纹传感器222、光学感应器或指纹检测感应器等，其可以具体包括光学成像芯片，或者具有一定光学叠层的光学成像芯片，其具有用于接收指纹检测光并对指纹检测光进行光电转换的多个光学感应单元的光学感应阵列。滤光片滤除指纹检测光的波段之外的其他红外光或者干扰光，以消除上述光线进入指纹传感器222对指纹识别造成干扰，从而提高指纹识别的效果。
具体的，滤光片可以位于指纹传感器222上方，或者也可以直接通过镀膜方式形成在指纹传感器222的光学感应阵列或者光路引导结构的上方。示例性的，本实施例中，滤光片包括但不仅限于红外截止滤光片(IR-Cut Filter，简称：IRCF)。
其中，光学元件221可以包括具有至少一个球面或非球面透镜的微距镜头以及用于承载微距镜头的物理组件，指纹传感器222及其上方的滤光片可以位于微距镜头的汇聚光路以实现指纹光学成像。
下面本申请实施例以波长为940nm的红外光为例，对本申请实施例中的导光板组件122做进一步阐述。屏下光学指纹识别装置的发射的探测光和屏下光学指纹识别装置中的指纹识别模组22接收的指纹检测光均为波长为940nm的红外光。
参考图6至图9所示，本申请实施例提供一种导光板组件122，适用于支持屏下指纹识别功能的液晶显示屏幕10，导光板组件122包括导光板1221和位于导光板1221表面的且对液晶显示屏幕10的背光进行导光的微结构。为了使得微结构对反射膜121和匀光膜123起到更好的支撑效果，通过增大导光板1221上微结构的高度，以使背光模组12和导光板1221相邻膜层的变形区域126(反射膜121和匀光膜123)与导光板1221隔离，从而规避掉牛顿环或者其他干扰纹路产生的条件，以避免被指纹识别模组22中的指纹传感器222接受的指纹检测光在透过导光板组件122时发生薄膜干涉，对指纹识别效果的干扰。
具体的，本实施例中，导光板1221相邻膜层的变形区域126位于背光模组12靠近指纹识别区域的一侧，其中，导光板1221相邻膜层的变形区域126内的变形为与导光板1221相邻的膜材凹向导光板1221的形变(如图3和图5所示)。因此，当与导光板1221相邻的膜材发生变形时，其变形区域126凹向导光板1221为与导光板1221的之间发生薄膜干涉创造了条件。
具体的，参考图6至图9所示，本实施例中，微结构位于导光板1221的上表面和下表面，微结构用于支撑背光模组12中与导光板1221相邻的膜材，以使背光模组12中和导光板1221相邻膜层的变形区域126与导光板1221隔离。与此同时，通过导光板1221上的微结构能够对背光(可见光)起到更好的引导作用，将背光转换成均匀的平面光以照亮液晶显示屏幕10。
进一步的，参考图6至图9所示，本实施例中，微结构包括两种不同结构的导光结构，导光结构用于对背光进行引导。其中，微结构包括第一微结构1222和第二微结构1223，其中，第一微结构1222位于导光板1221的下表面且用于支撑背光模组12的反射膜121，第二微结构1223位于导光板1221的上表面且用于支撑背光模组12的匀光膜123。具体的，本实施例中，通过第一微结构1222和第二微结构1223能够对反射膜121和匀光膜123起到一定的支撑作用，将反射膜121和匀光膜123的变形区域126与导光板1221隔离。第一微结构1222用于将导光板1221内经反射膜121全反射的背光打散，以使背光从液晶显示屏幕10的正面发光；第二微结构1223用于对导光板1221内的背光进行导光的同时增加背光的亮度。本实施例通过导光板组件122将背光转换成均匀的平面光以照亮液晶显示屏幕10，以用于液晶显示屏幕10的显示。
应理解的是，在第一微结构1222的结构不变的基础上，第一微结构1222在导光板1221上的密度越大对于反射膜121的支撑作用越强。因此，本实施例中，第一微结构1222的高度与第一微结构1222在导光板1221上的透射区域1224的密度成反比，也就是说，第一微结构1222在透射区域1224的密度越大，第一微结构1222的高度越小，反之，当第一微结构1222在透射区域1224的密度越小，第一微结构1222的高度越大。其中，参考图2所示，透射区域1224为导光板1221上用于使指纹检测光透过的区域，也就是说，透射区域1224主要用于在手指形成的携带有指纹信息的指纹检测光可以顺利透过导光板1221并进入指纹识别模组22，以实现指纹识别，避免携带有指纹信息的指纹检测光受导光板1221的光路引导影响而无法正常进入指纹识别模组22从而造成指纹图像失真。可选地，在具体实施例中，指纹识别模组22可以至少部分位于导光板1221203的透射区域1224的垂直下方。
由于背光灯带靠近导光板1221的一侧(即入光面)，且靠近指纹识别区域设置，考虑到背光在传输过程中有一定的损耗，为了使液晶显示屏幕10的显示效果具有一定的均一性(即显示亮度基本一致)，本实施例中，第一微结构1222在导光板1221上呈不均匀分布(如图2所示，朝着背离背光光源的方向上，第一微结构1222的密度逐渐增大)。第一微结 构1222在透射区域1224内的密度小于第一微结构1222在导光板1221的背光引导区域1225的密度，或者，上述透射区域1224为空白结构，即透射区域1224内未设置第一微结构1222(如图2所示)，以增大携带有指纹信息的指纹检测光在透射区域1224的透过率。其中，背光引导区域1225用于将背光光源提供的可见光转化为从导光板1221靠近显示模组11一侧的出光面出射的平面光，以照亮显示模组11，确保背光模组12能够正常提供背光。由于改变第一微结构1222在导光板1221上的密度，可能会对液晶显示屏幕10的显示效果造成一定的影响(显示可能会出现局部过量或者过暗)。因此本申请实施例通过增加第一微结构1222的高度，以使背光模组12和导光板1221相邻膜层的变形区域126(反射膜121和匀光膜123)与导光板1221隔离。
具体的，本实施例中，第一微结构1222可以为导光点，导光点又称导光网点，具体的，导光点可以为塑料颗粒、对于背光具有高反射的颗粒、或者其他能够实现改变光线且使光线向各个角度扩散的微小颗粒，即本实施例中，导光点包括但不仅限于塑料颗粒。参考图6所示，相较于现有技术中导光板1221底部导光点的高度(3um)，本实施例中，第一微结构1222的高度为4.5um-5um。当第一微结构1222的高度小于4.5um时，对于反射膜121的支撑强度不够，反射膜121的变形区域126可能会接触导光板1221不均匀，当第一微结构1222的高度大于5um时，第一微结构1222可能会在液晶显示屏幕10上显示出来，因此，在将反射膜121的变形区域126与导光板1221隔离的同时要保证液晶显示屏幕10的显示效果，将第一微结构1222的高度限制在上述范围内，而且在当第一微结构1222的高度在上述范围内时，反射膜121变形区域126与导光板1221之间的间距L大于探测光(比如940nm)的波长的一半，此时，探测光照射到该变形区域126内时，探测光的投射和反射作用干扰较少，从而有效的避免了薄膜干涉的发生。
由于匀光膜123的厚度为50um，容易变形，且与导光板组件122的接触面光滑，同样会导致薄膜干涉的问题。在上述基础上，参考图7所示，本实施例中，导光板组件122还用于通过增大第二微结构1223之间的间距L，以使导光板1221和匀光膜123的变形区域126隔离，从而破坏导光板1221 和匀光膜123的变形区域126之间发生薄膜干涉的条件。
其中，参考图7至图9所示，本实施例中，第二微结构1223沿直线均匀排布在导光板1221的上表面，且第二微结构1223的表面为弧形结构。当第二微结构1223的曲率半径R为40um时，相较于现有技术中，第二微结构的高度H为1um，间距L普遍为40um，本实施例中，第二微结构的高度H为2um-5um，比如3um和4um，第二微结构1223之间的间距L为70um-90um，比如80um。相应的，当第二微结构的高度H大于5um时，由于第二微结构1223增高过大，将导致第二微结构1223可能会在液晶显示屏幕10上显示出来，从而影响液晶显示屏幕10的显示效果。因此，在将匀光膜123的变形区域126与导光板1221隔离的同时要保证液晶显示屏幕10的显示效果，将第二微结构的高度H和间距L限制在上述范围内，而且在当第二微结构的高度H和间距L在上述范围内时，匀光膜123变形区域126与导光板1221之间的间距L大于探测光(比如940nm)的波长的一半，此时，探测光照射到该变形区域126内时，探测光的投射和反射作用干扰较少，从而有效的避免了薄膜干涉的发生。
具体的，第二微结构1223可以为对背光具有导光性能的弧形导光结构，弧形导光结构可以采用塑料或者对于背光具有高反射的材料，其可以与第一微结构1222和导光板1221采用同一种材料通过注塑或者其他一体成形的工艺制备而成，在本实施例中，对于第二微结构1223的材料并不做进一步限定。
本申请提供一种屏下指纹识别装置，通过增大导光板上的微结构的高度，使背光模组中和导光板相邻膜层的变形区域与导光板隔离，以避免指纹检测光在透过导光板组件时发生薄膜干涉，从而在实现屏下指纹识别功能的同时，能够避免由于背光模组的光学膜片的变形对指纹识别效果的干扰问题。
实施例二
在上述实施例一的基础上，本申请实施例提供一种液晶显示屏指纹识别系统，包括液晶显示屏幕10和如实施例一中的屏下指纹识别装置20，液晶显示屏幕10包括显示模组11和位于显示模组11之下的背光模组12，背光模组12位于指纹识别装置的指纹识别模组22之上；其中，背光模组 12包括上实施例中的导光板组件122。
具体的，本实施例可以参考实施例一中对于屏下指纹识别装置20和导光板组件122的描述，在本实施例中，不再对屏下指纹识别装置20和导光板组件122作进一步阐述。
液晶显示屏幕10一般包括显示模组11下方的背光模组12，指纹识别模组22位于背光模组12之下，背光模组12上形成有用于使指纹检测光透过的透光区域，透光区域可以是指背光模组12的相关光学膜层组件在探测光和指纹检测光的传输路径形成关于指纹检测光的波段是透光的区域，指纹识别模组22位于背光模组12的透光区域之下，以使指纹检测光透过背光模组12传输到指纹识别模组22。
具体的，本实施例中，透光区域可以为指纹检测光在液晶显示屏幕10的传输路径所对应的区域，且探测光的透射波段覆盖探测光的反射波段，以使探测光及其在手指形成的指纹检测光可以穿透背光模组12的透光区域。
需要说明的是，在实际应用中，可以根据需要对检测光源、背光模组的透光区域、以及指纹识别模组之间的相对位置进行调整，但是调整后的检测光源21、背光模组的透光区域、以及指纹识别模组之间的相对位置，需满足检测光源21发射的探测光能够照射到指纹识别区域上方的手指，且经手指反射或透射形成的指纹检测光能够透过背光模组12的透光区域进入指纹识别模组22。
本申请提供一种液晶显示屏指纹识别系统，通过增大导光板上的微结构的高度，使背光模组中和导光板相邻膜层的变形区域与导光板隔离，以避免指纹检测光在透过导光板组件时发生薄膜干涉，从而在实现屏下指纹识别功能的同时，能够避免由于背光模组的光学膜片的变形对指纹识别效果的干扰问题。
实施例三
在上述实施例一的基础上，本申请实施例提供一种支持屏下指纹识别功能的液晶显示屏幕10，其包括显示模组11和背光模组12，背光模组12设在显示模组11之下，用于为液显示模组11提供背光，并将在液晶显示屏幕10上方的手指形成的指纹检测光传输至背光模组12之下的指纹识别模组22。 屏下指纹识别装置20包括检测光源21和指纹识别模组22，其中，检测光源21用于向位于指纹识别区域上方的手指发射探测光，探测光照射到指纹识别区域上方的手指并手指反射或者透射之后形成携带有指纹信息的指纹检测光，指纹识别模组22用于接收透过液晶显示屏幕10的并携带有指纹信息的指纹检测光，以获取手指的指纹图像。其中背光模组12包括如上任一项的导光板组件122。具体的，本实施例可以参考实施例一中对于导光板组件122的描述，在本实施例中，不再对导光板组件122作进一步阐述。
本申请提供一种支持屏下指纹识别功能的液晶显示屏幕，通过增大导光板上的微结构的高度，使背光模组中和导光板相邻膜层的变形区域与导光板隔离，以避免指纹检测光在透过导光板组件时发生薄膜干涉，从而能够避免由于背光模组的光学膜片的变形对指纹识别效果的干扰问题。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应作广义理解，例如，可以是固定连接，也可以是通过中间媒介间接相连，可以是两个元件内部的连通或者两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请中的具体含义。
在本申请的描述中，需要理解的是，术语“上”、“下”、“前”、“后”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或者位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或者暗示所指的装置或者元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。在本申请的描述中，“多个”的含义是两个或两个以上，除非是另有精确具体地规定。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例如能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单 元。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (30)

  1. 一种屏下指纹识别装置，适用于具有液晶显示屏幕的电子设备，其特征在于，所述屏下指纹识别装置的指纹识别区域至少部分位于所述液晶显示屏幕的显示区域；
    所述屏下指纹识别装置包括位于所述液晶显示屏幕的背光模组下方的指纹识别模组，所述指纹识别模组用于接收经所述指纹识别区域上方的手指形成的并透过所述液晶显示屏幕的指纹检测光，以获取所述手指的指纹图像；
    其中，所述背光模组包括导光板组件，所述导光板组件包括导光板和位于所述导光板表面的且对所述液晶显示屏幕的背光进行导光的微结构，其中，所述导光板组件用于通过增大所述微结构的高度使所述背光模组中和所述导光板相邻膜层的变形区域与所述导光板隔离，以避免所述指纹检测光在透过所述导光板组件时发生薄膜干涉。
  2. 根据权利要求1所述的屏下指纹识别装置，其特征在于，所述屏下指纹识别装置包括检测光源，所述检测光源用于向位于所述指纹识别区域上方的手指发射探测光，所述探测光照射到所述指纹识别区域上方的手指并形成携带有指纹信息的所述指纹检测光。
  3. 根据权利要求2所述的屏下指纹识别装置，其特征在于，所述探测光或者所述指纹检测光与所述背光模组提供的用于显示画面的所述背光的波长不同。
  4. 根据权利要求3所述的屏下指纹识别装置，其特征在于，所述探测光和所述指纹检测光均为红外光，所述背光模组提供的所述背光为可见光。
  5. 根据权利要求1所述的屏下指纹识别装置，其特征在于，所述导光板相邻膜层的变形区域位于所述背光模组靠近所述指纹识别区域的一侧，其中，所述导光板相邻膜层的变形区域内的变形为与所述导光板相邻的膜材凹向所述导光板的形变。
  6. 根据权利要求1-5中任意一项所述的屏下指纹识别装置，其特征在于，所述微结构位于所述导光板的上表面和下表面，所述微结构用于支撑所述背光模组中与所述导光板相邻的膜材，以使所述背光模组中和所述导光 板相邻膜层的变形区域与所述导光板隔离。
  7. 根据权利要求6所述的屏下指纹识别装置，其特征在于，所述微结构包括两种不同结构的导光结构，所述导光结构用于对所述背光进行引导。
  8. 根据权利要求7所述的屏下指纹识别装置，其特征在于，所述微结构包括第一微结构和第二微结构，其中，所述第一微结构位于所述导光板的下表面且用于支撑所述背光模组的反射膜，所述第二微结构位于所述导光板的上表面且用于支撑所述背光模组的匀光膜。
  9. 根据权利要求8所述的屏下指纹识别装置，其特征在于，所述第一微结构用于将所述导光板内全反射的所述背光打散，以使所述背光从所述液晶显示屏幕的正面发光；所述第二微结构用于对所述导光板内的所述背光进行导光以及增亮。
  10. 根据权利要求8所述的屏下指纹识别装置，其特征在于，所述第一微结构的高度与所述第一微结构在所述导光板上的透射区域的密度成反比，其中，所述透射区域为所述导光板上用于使所述指纹检测光透过的区域。
  11. 根据权利要求10所述的屏下指纹识别装置，其特征在于，所述第一微结构在所述透射区域内的密度小于所述第一微结构在所述导光板的背光引导区域的密度，或者所述透射区域为空白结构。
  12. 根据权利要求8-11中任意一项所述的屏下指纹识别装置，其特征在于，所述第一微结构为导光点，且所述第一微结构的高度为4.5um-5um。
  13. 根据权利要求8-12中任意一项所述的屏下指纹识别装置，其特征在于，所述导光板组件还用于通过增大所述第二微结构之间的间距，以使所述导光板和所述匀光膜的变形区域隔离。
  14. 根据权利要求13所述的屏下指纹识别装置，其特征在于，所述第二微结构沿直线均匀排布在所述导光板的上表面，且所述第二微结构的表面为弧形结构。
  15. 根据权利要求13或14所述的屏下指纹识别装置，其特征在于，所述第二微结构的曲率半径为40um时，所述第二微结构的高度为2um-5um，所述第二微结构之间的间距为70um-90um。
  16. 根据权利要求4-15中任意一项所述的屏下指纹识别装置，其特征在于，所述探测光和所述指纹检测光均为波长为940nm的红外光。
  17. 一种导光板组件，适用于支持屏下指纹识别功能的液晶显示屏幕，其特征在于，所述导光板组件包括导光板和位于所述导光板表面的且对所述液晶显示屏幕的背光进行导光的微结构，其中，所述导光板组件用于通过增大所述微结构的高度使所述液晶显示屏幕中和所述导光板相邻膜层的变形区域与所述导光板隔离，以避免被屏下光学指纹识别装置接收的指纹检测光在透过所述导光板组件时发生薄膜干涉。
  18. 根据权利要求17所述的导光板组件，其特征在于，所述导光板相邻膜层的变形区域位于所述液晶显示屏幕的背光模组靠近所述指纹识别区域的一侧，其中，所述导光板相邻膜层的变形区域内的变形为与所述导光板相邻的膜材凹向所述导光板的形变。
  19. 根据权利要求18所述的导光板组件，其特征在于，所述微结构位于所述导光板的上表面和下表面，所述微结构用于支撑所述背光模组中与所述导光板相邻的膜材，以使所述背光模组中和所述导光板相邻膜层的变形区域与所述导光板隔离。
  20. 根据权利要求17-19中任意一项所述的导光板组件，其特征在于，所述微结构包括两种不同结构的导光结构，所述导光结构用于对所述背光进行引导。
  21. 根据权利要求20所述的导光板组件，其特征在于，所述微结构包括第一微结构和第二微结构，其中，所述第一微结构位于所述导光板的下表面且用于支撑所述背光模组的反射膜，所述第二微结构位于所述导光板的上表面且用于支撑所述背光模组的匀光膜；
    所述第一微结构用于将所述导光板内全反射的所述背光打散，以使所述背光从所述液晶显示屏幕的正面发光；所述第二微结构用于对所述导光板内的所述背光进行导光的同时增加所述背光的亮度。
  22. 根据权利要求21所述的导光板组件，其特征在于，所述第一微结构的高度与所述第一微结构在所述导光板上的透射区域的密度成反比，其中，所述透射区域为所述导光板上用于使被所述屏下光学指纹识别装置的指纹识别模组接收的指纹检测光透过的区域。
  23. 根据权利要求22所述的导光板组件，其特征在于，所述第一微结构在所述透射区域内的密度小于所述第一微结构在所述导光板的背光引导区域的密度，或者所述透射区域为空白结构。
  24. 根据权利要求21-23中任意一项所述的导光板组件，其特征在于，所述第一微结构为导光点，且所述第一微结构的高度为4.5um-5um。
  25. 根据权利要求21-23中任意一项所述的导光板组件，其特征在于，所述导光板组件还用于通过增大所述第二微结构之间的间距，以使所述导光板和所述匀光膜的变形区域隔离。
  26. 根据权利要求25所述的导光板组件，其特征在于，所述第二微结构沿直线均匀排布在所述导光板的上表面，且所述第二微结构的表面为弧形结构。
  27. 根据权利要求25或26所述的导光板组件，其特征在于，所述第二微结构的曲率半径为40um时，所述第二微结构的高度为2um-5um，所述第二微结构之间的间距为70um-90um。
  28. 根据权利要求17-27中任意一项所述的导光板组件，其特征在于，所述屏下光学指纹识别装置的发射的探测光和所述屏下光学指纹识别装置中的指纹识别模组接收的指纹检测光均为波长为940nm的红外光。
  29. 一种液晶显示屏指纹识别系统，其特征在于，包括液晶显示屏幕和如权利要求1-16中任意一项所述的屏下指纹识别装置，所述液晶显示屏幕包括显示模组和位于所述显示模组之下的背光模组，所述背光模组位于所述指纹识别装置的指纹识别模组之上；其中，所述背光模组包括如权利要求17-28中任意一项所述的导光板组件。
  30. 一种支持屏下指纹识别功能的液晶显示屏幕，其特征在于，包括显示模组和背光模组，所述背光模组设在所述显示模组之下，用于为所述液显示模组提供背光，并将在所述液晶显示屏幕上方的手指形成的指纹检测光传输至所述背光模组之下的指纹识别模组，其中所述背光模组包括如权利要求17-28中任一项所述的导光板组件。
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