WO2020037991A1 - 屏下光学指纹识别系统及电子装置 - Google Patents

屏下光学指纹识别系统及电子装置 Download PDF

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Publication number
WO2020037991A1
WO2020037991A1 PCT/CN2019/081564 CN2019081564W WO2020037991A1 WO 2020037991 A1 WO2020037991 A1 WO 2020037991A1 CN 2019081564 W CN2019081564 W CN 2019081564W WO 2020037991 A1 WO2020037991 A1 WO 2020037991A1
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WIPO (PCT)
Prior art keywords
fingerprint
detection light
optical
fingerprint recognition
backlight module
Prior art date
Application number
PCT/CN2019/081564
Other languages
English (en)
French (fr)
Inventor
谢浩
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 CN201980002489.7A priority Critical patent/CN110678874B/zh
Priority to CN201922002568.8U priority patent/CN210895487U/zh
Publication of WO2020037991A1 publication Critical patent/WO2020037991A1/zh

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00Optical elements other than lenses
    • G02B5/20Filters
    • G02B5/208Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00Arrangements for image or video recognition or understanding
    • G06V10/10Image acquisition
    • G06V10/12Details of acquisition arrangements; Constructional details thereof
    • G06V10/14Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/141Control of illumination
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00Arrangements for image or video recognition or understanding
    • G06V10/10Image acquisition
    • G06V10/12Details of acquisition arrangements; Constructional details thereof
    • G06V10/14Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/143Sensing or illuminating at different wavelengths
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • G06V40/1318Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/13Sensors therefor
    • G06V40/1324Sensors therefor by using geometrical optics, e.g. using prisms
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12Fingerprints or palmprints
    • G06V40/1382Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger
    • G06V40/1394Detecting the live character of the finger, i.e. distinguishing from a fake or cadaver finger using acquisition arrangements
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements

Definitions

  • the present application relates to the technical field of fingerprint recognition, and in particular, to an under-screen optical fingerprint recognition system and an electronic device.
  • Fingerprint recognition technology refers to identifying fingerprint information by sensing and analyzing the valley and ridge signals of the fingerprint with the fingerprint recognition module. It has the advantages of high security, convenient and fast operation, and is widely used in electronic products.
  • the fingerprint imaging technology is implemented in various technologies such as optical imaging, capacitive imaging, and ultrasound imaging. Among them, optical fingerprint recognition technology has gradually become a fingerprint because of its strong penetrability, support for full-screen placement, and simple product structure design. The mainstream of identification technology is widely used in electronic devices.
  • the optical identification module when an optical fingerprint identification module is set in a display screen, the optical identification module is located under the display screen.
  • the optical fingerprint detection module can be set on the side of the display module facing away from the display panel. During fingerprint detection, the finger can be irradiated with light emitted by the screen itself to form return light. After the return light passes through the display module The fingerprint is irradiated on the optical fingerprint recognition module.
  • the optical fingerprint detection module can be set on the side of the display module facing away from the display panel. Because the steel plate and reflective film in the backlight module are opaque, and the diffuser film in the backlight module It also has a fogging effect on the light, and the light-increasing film also has a directional constraint characteristic on the light, so that fingerprint detection cannot be achieved.
  • the invention provides an under-screen optical fingerprint recognition system and an electronic device, in order to solve the problem that the existing optical fingerprint recognition module is disposed on the side of the display module facing away from the display panel in the LCD mode, and the under-screen fingerprint detection cannot be realized.
  • a first aspect of the present invention provides an under-screen optical fingerprint recognition system applied to an electronic device having a backlight module and a display panel, wherein the backlight module is configured to provide visible light to the display panel to enable the display Panel display screen, the optical fingerprint recognition system under the screen includes: optical fingerprint recognition module and fingerprint detection light source;
  • the optical fingerprint recognition module is located on a side of the backlight module facing away from the display panel.
  • the fingerprint detection light source is configured to emit detection light to a fingerprint detection area on the display panel.
  • the detection light is Can pass non-visible light of the backlight module, and the detection light is reflected by a finger on the detection area, passes through the backlight module and enters the optical fingerprint recognition module, so that the optical fingerprint
  • the recognition module forms a fingerprint image according to the reflected detection light.
  • the backlight module includes a diffusion film that can transmit the detection light, and the diffusion film is used to atomize visible light emitted by the backlight module.
  • the backlight module further includes: a reflective film that allows the detection light to pass through, the reflective film is located at a portion of the diffusion film facing the optical fingerprint recognition module.
  • the reflective film is configured to reflect the visible light.
  • the backlight module further includes: a steel plate, the steel plate is located on a side of the reflective film facing the optical fingerprint recognition module, and the steel plate and the optical fingerprint An opening is provided at the corresponding position of the detection module for the reflected detection light to pass through.
  • the backlight module further includes a brightness enhancement film that can transmit the detection light, and the brightness enhancement film is located on a diffusion film of the backlight module toward the display. On one side of the panel, the brightness enhancement film is used to enhance the brightness of the visible light.
  • the brightness enhancement film uses a non-prism structured film layer structure to enhance the brightness of the backlight module.
  • the brightness enhancement film includes a plurality of optical material layers, and the optical material layer is composed of an optical material with a low dispersion coefficient.
  • the dispersion coefficient of the optical material layer is between 30-60.
  • a refractive index of the multilayer optical material layer sequentially increases from a direction from the diffusion film to the display panel.
  • the backlight module further includes: a light guide plate, the light guide plate is located between a diffusion film of the backlight module and a reflection film of the backlight module.
  • the fingerprint detection light source is located below a glass cover of the display panel, and the fingerprint detection light source is disposed side by side with a liquid crystal layer of the display panel; or,
  • the fingerprint detection light source is located on a side of the backlight module facing away from the display panel.
  • a backlight light source is provided on a side of the light guide plate of the backlight module facing the optical fingerprint recognition module, and the fingerprint detection light source is located on the light guide plate facing the optical One side of the fingerprint recognition module, and the fingerprint detection light source and the backlight light source located on the light guide plate side facing the optical fingerprint recognition module are arranged side by side.
  • the substrate is located on a side of the backlight module facing away from the display panel, and the fingerprint detection light source and the optical fingerprint identification module are disposed at One side of the substrate facing the backlight module.
  • the light emitting surface of the fingerprint detection light source is parallel to the glass cover of the display panel, or between the light emitting surface of the fingerprint detection light source and the glass cover of the display panel. Form an angle.
  • the optical fingerprint recognition module includes an optical element and a fingerprint image sensor, the optical element is located on a side of the fingerprint image sensor facing the backlight module, and the optical The element is disposed at a position corresponding to the fingerprint image sensor, and the reflected detection light passes through the backlight module, passes through the optical element, and enters the fingerprint image sensor to form a fingerprint image.
  • the optical element includes at least one aspherical lens, and the lens is configured to focus the detection light to the fingerprint image sensor to increase the optical fingerprint recognition module. Field of view.
  • the optical element includes a collimation hole layer, and a plurality of parallel light-transmitting holes are opened on the collimation hole layer, so that the reflected detection light passes through the light source.
  • the backlight module is projected on the fingerprint image sensor through the light transmission hole.
  • the optical element includes a microlens layer and an aperture layer, and a light-transmitting material layer is disposed between the microlens layer and the aperture layer, and the microlens layer is located at The diaphragm layer faces one side of the backlight module, and the convex end of the micro lens layer faces the backlight module;
  • the diaphragm layer includes a diaphragm plate, and a plurality of diaphragm holes parallel to each other are arranged on the diaphragm plate, so that the reflected detection light passes through the backlight module and then passes through the micro lens in order. Layer, the light-transmitting material layer, and the aperture hole are irradiated on the fingerprint image sensor.
  • the diaphragm layer includes a plurality of diaphragm plates that are arranged in multiple layers.
  • the fingerprint detection light source is an infrared fingerprint detection light source
  • the infrared fingerprint detection light source is connected to the optical fingerprint recognition module and controlled by the optical fingerprint recognition module to issue Infrared light of a specific wavelength.
  • a filter layer is further included, and the filter layer is located between the optical fingerprint recognition module and the backlight module and corresponds to the optical fingerprint recognition module; Alternatively, the filter layer is located between the optical element of the optical fingerprint recognition module and the fingerprint image sensor and corresponds to the fingerprint image sensor.
  • the filter layer includes an infrared cut-off filter layer, and a light emission frequency band of the infrared fingerprint detection light source is at least partially outside a cut-off frequency band of the infrared cut-off filter layer.
  • a light-transmissive bonding layer is further included, and the bonding layer is used for bonding the filter layer to the optical element.
  • the fingerprint detection light source is one or more, and a plurality of the fingerprint detection light sources are arranged with the optical fingerprint recognition module as a symmetrical center or a diagonal center; or ,
  • the fingerprint detection light source is linear, and the fingerprint detection light source is located on one side of the optical fingerprint recognition module.
  • an electronic device including any of the above-mentioned under-screen optical fingerprint recognition systems.
  • the present invention provides an under-screen optical fingerprint recognition system and an electronic device.
  • the under-screen light fingerprint recognition system include an optical fingerprint recognition module and a fingerprint detection light source
  • the optical fingerprint recognition module is located on a backlight module facing away from the display panel.
  • the fingerprint detection light source is used to emit detection light to the fingerprint detection area on the display panel, and make the detection light be invisible light that can pass through the backlight module, and the detection light is reflected by the fingers on the detection area and transmitted through the backlight.
  • the module enters the optical fingerprint identification module, so that the optical fingerprint identification module forms a fingerprint image according to the reflected detection light.
  • the optical fingerprint recognition module is disposed on the side of the backlight module facing away from the display panel, and the detection light emitted by the fingerprint detection light source can transmit light to the backlight module. In this way, the detection light emitted by the fingerprint detection light source is transmitted. Reflected on the finger irradiated to the fingerprint detection area, the reflected detection light with fingerprint information can also pass through the backlight module and shine on the optical fingerprint recognition module located behind the backlight module.
  • the optical fingerprint recognition module A fingerprint image can be formed according to the reflected detection light, and the fingerprint image can be converted into an electrical signal for transmission and comparison and identification of the fingerprint, thereby realizing the detection of the optical fingerprint.
  • the problem that the existing optical fingerprint recognition module is set on the side of the display module facing away from the display panel in the LCD mode, and the problem of under-screen fingerprint detection cannot be achieved.
  • FIG. 1 is a schematic structural diagram of an optical fingerprint recognition system under a screen provided by Embodiment 1 of the present invention
  • Embodiment 1 of the present invention is a schematic structural diagram of another under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 3 is a schematic diagram of setting a fingerprint detection light source in an under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of setting a fingerprint detection light source in another optical fingerprint recognition system under the screen provided by Embodiment 1 of the present invention.
  • FIG. 5 is a schematic diagram of setting a fingerprint detection light source in another under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 6 is a schematic diagram of setting a fingerprint detection light source in another under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 7 is an electronic device with an under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • Embodiment 8 is another electronic device with an under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 9 is another electronic device with an under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 10 is another electronic device with an under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • Embodiment 11 is another electronic device with an under-screen optical fingerprint recognition system provided by Embodiment 1 of the present invention.
  • FIG. 12 is a schematic structural diagram of an under-screen optical fingerprint recognition system provided by Embodiment 3 of the present invention.
  • FIG. 13 is a schematic structural diagram of another under-screen optical fingerprint recognition system provided by Embodiment 3 of the present invention.
  • FIG. 14 is a schematic structural diagram of an under-screen optical fingerprint recognition system according to a fourth embodiment of the present invention.
  • FIG. 15 is a schematic structural diagram of an under-screen optical fingerprint recognition system provided by Embodiment 5 of the present invention.
  • 16 is a schematic structural diagram of an under-screen optical fingerprint recognition system according to a sixth embodiment of the present invention.
  • FIG. 17 is a schematic structural diagram of another optical fingerprint recognition system under the screen provided by Embodiment 6 of the present invention.
  • FIG. 18 is a schematic structural diagram of a collimating hole layer in an under-screen optical fingerprint identification system provided by Embodiment 6 of the present invention.
  • FIG. 19 is a schematic structural diagram of an under-screen optical fingerprint recognition system according to a seventh embodiment of the present invention.
  • FIG. 20 is a schematic structural diagram of another optical fingerprint recognition system under the screen provided in Embodiment 7 of the present invention.
  • FIG. 21 is a schematic structural diagram of a microlens layer in another under-screen optical fingerprint recognition system provided by Embodiment 7 of the present invention.
  • FIG. 22 is a schematic partial enlarged structure diagram of an under-screen optical fingerprint recognition system provided in Embodiment 7 of the present invention.
  • FIG. 23 is a schematic partial enlarged structure diagram of another optical fingerprint recognition system under the screen provided by Embodiment 7 of the present invention.
  • FIG. 24 is a partial enlarged structure diagram of another optical fingerprint recognition system under the screen provided in Embodiment 7 of the present invention.
  • Display panel-10 glass cover-11; liquid crystal layer-12; under-screen optical fingerprint recognition system-20; fingerprint detection light source-21; optical glue-211; optical fingerprint recognition module-22; optical element-221; fingerprint Image sensor-222; transmission hole-223; microlens layer-224; aperture layer-225; aperture hole-226; bonding layer-227; backlight module-30; brightness enhancement film-31; diffusion film- 32; reflective film-33; steel plate-34; opening-341; light guide plate-35; backlight light source-36; filter layer-40; substrate-50; electronic device-60.
  • FIG. 1 is a schematic structural diagram of an under-screen optical fingerprint recognition system provided in Embodiment 1 of the present invention
  • FIG. 2 is a schematic structural diagram of another under-screen optical fingerprint recognition system provided in Embodiment 1 of the present invention
  • FIG. 3 is the present invention
  • FIG. 4 is a schematic diagram of setting a fingerprint detection light source in an under-screen optical fingerprint recognition system according to the first embodiment of the present invention
  • FIG. 5 It is a schematic diagram of setting a fingerprint detection light source in another screen-mounted optical fingerprint recognition system provided in Embodiment 1 of the present invention
  • FIG. 6 is a schematic diagram of setting a fingerprint detection light source in another screen-mounted optical fingerprint recognition system provided in Embodiment 1 of the present invention
  • FIG. 7 is an electronic device with an under-screen optical fingerprint recognition system provided in Embodiment 1 of the present invention
  • FIG. 8 is another electronic device with an under-screen optical fingerprint recognition system provided in Embodiment 1 of the present invention
  • FIG. 9 It is another electronic device with an under-screen optical fingerprint recognition system provided by the first embodiment of the present invention
  • FIG. 10 is another one provided by the first embodiment of the present invention.
  • the electronic device having a screen at an optical fingerprint recognition system, 11 is an embodiment of the present invention to provide an electronic device having a screen and the optical fingerprint identification system.
  • This embodiment provides an under-screen optical fingerprint recognition system, which is applied to an electronic device having a backlight module 30 and a display panel 10.
  • the backlight module 30 is located behind the display panel 10, and the backlight module 30 is used to display
  • the panel provides visible light, and its function is to supply sufficient brightness and uniformly distributed light sources, so that the display module of the display panel 10 can display images normally.
  • the under-screen optical fingerprint recognition system includes: an optical fingerprint recognition module 22 and a fingerprint detection light source 21, and the optical fingerprint recognition module 22 is disposed on a backlight module.
  • the side facing away from the display panel 10, that is, the optical fingerprint identification module 22 is located behind the backlight module 30.
  • the fingerprint detection light source 21 is configured to emit detection light to a fingerprint detection area on the display panel 10. Specifically, the fingerprint detection light source 21 emits detection light to irradiate a finger on the fingerprint detection area, and the detection light is transparent to the backlight module.
  • Non-visible light the detection light returns after being reflected by a finger on the detection area, the reflected detection light already has fingerprint information of the finger, and the reflected detection light can also pass through the backlight module 30.
  • the detection light enters the optical fingerprint recognition module 22 after passing through the backlight module 30.
  • the optical fingerprint recognition module 22 receives the reflected detection light and forms a fingerprint image based on the reflected detection light, and converts the fingerprint image into electricity Signal, the fingerprint can be compared and identified, that is, in this embodiment, the optical fingerprint recognition module 22 is set on the side of the backlight module 30 facing away from the display panel 10, and the detection light emitted by the fingerprint detection light source 21 can be The light-transmitting backlight module 30, in this way, the detection light emitted by the fingerprint detection light source 21 is reflected on the fingers of the fingerprint detection area, and the reflected detection with fingerprint information Light can also pass through the backlight module 30 and shine on the optical fingerprint recognition module 22 located behind the backlight module 30.
  • the optical fingerprint recognition module 22 can form a fingerprint image based on the reflected detection light, and then print the fingerprint. The image is converted into an electrical signal and transmitted for fingerprint comparison and identification, thus realizing the detection of optical fingerprints.
  • the detection light is invisible light that can pass through the backlight module 30.
  • the detection light emitted by the fingerprint detection light source 21 can pass through the backlight module 30 while ensuring that the backlight is not affected. Light emitting performance of the module 30.
  • fingerprint detection light often cannot pass through the backlight module, or the backlight module often affects the optical performance of the light emitted by the fingerprint detection light source.
  • the method for enabling the detection light emitted by the fingerprint detection light source 21 to pass through the backlight module 30 may be to make the fingerprint detection light source 21 and the backlight module 30 and the existing fingerprint detection light source and backlight module all have The difference may be that one of the fingerprint detection light source 21 and the backlight module 30 is different.
  • the fingerprint detection light source 21 emits detection light to the fingerprint detection area.
  • the detection light is irradiated to a finger on the fingerprint detection area, Reflected by the finger, the reflected detection light has fingerprint information.
  • the reflected detection light can pass through the backlight module 30 and enter the optical fingerprint recognition module 22 and the optical fingerprint recognition module 22 located behind the backlight module 30. After receiving the reflected detection light, and forming a fingerprint image based on the fingerprint information carried by the reflected detection light, the fingerprint information can be compared and detected after the fingerprint image is replaced with an electrical signal, thereby realizing the optical fingerprint behind Identify.
  • the fingerprint detection area is located on the display panel 10.
  • the fingerprint detection area may be a part or a plurality of areas defined on the display panel 10, or may be an area covering the entire display panel 10.
  • the fingerprint detection light source 21 may be located on the side of the backlight module 30 facing away from the display panel 10 and disposed side by side with the optical fingerprint identification module 22, or the fingerprint detection light source 21 may also be located on the glass cover 11 of the display panel 10. Below, it can be ensured that the detection light emitted by the fingerprint detection light source 21 can be irradiated on the fingerprint detection area on the display panel 10, and the optical fingerprint recognition module 22 can receive the reflected detection light.
  • the display panel 10 may include a liquid crystal layer 12 and a glass cover 11.
  • the glass cover 11 is a display screen of an electronic device.
  • the display panel 10 may be a display panel in the prior art. Specifically, Other parts may also be included, and the specific setting method may refer to the prior art, which is not described in this embodiment.
  • the detection light emitted by the fingerprint detection light source 21 is made invisible, so that when fingerprint detection is performed, when the light emitted by the fingerprint detection light source 21 shines on the fingerprint detection area, the detection light is invisible to the user.
  • the detection area does not produce visible brightness, which can avoid the occurrence of brightness in each detection and reduce the user experience.
  • the fingerprint detection light source 21 may be a light emitting diode (LED), a vertical cavity surface emitting laser (VCSEL), a laser diode (Laser Diode), and the like, which are not limited in this embodiment.
  • LED light emitting diode
  • VCSEL vertical cavity surface emitting laser
  • Laser Diode laser diode
  • the fingerprint detection light source 21 is an infrared fingerprint detection light source, that is, the detection light emitted by the fingerprint detection light source 21 is infrared light.
  • the fingerprint detection light source 21 may be located under the glass cover 11 of the display panel 10, and the fingerprint detection light source 21 and the liquid crystal layer 12 of the display panel 10 are arranged side by side; or, the fingerprint detection light source 21 may also be located on the backlight module 30 facing away from the display panel 10. One side.
  • the under-screen optical fingerprint recognition system further includes a substrate 50.
  • the substrate 50 is located on a side of the backlight module 30 facing away from the display panel 10, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 is disposed on a side of the substrate 50 facing the backlight module 30.
  • the substrate 50 may be located on the side of the backlight module 30 facing away from the display panel 10.
  • the fingerprint detection light source 21 and the optical fingerprint identification module 22 It is disposed on a side of the substrate 50 facing the backlight module 30.
  • the substrate 50 is used to provide a setting place for the fingerprint detection light source 21 and the optical fingerprint recognition module 22.
  • the substrate 50 may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the light emitting surface of the fingerprint detection light source 21 and the glass cover 11 of the display panel 10 may be parallel.
  • the fingerprint detection light source 21 may be located away from the backlight module 30.
  • One side of the display panel 10 is specifically disposed on the substrate 50 or may be disposed under the glass cover plate 11.
  • the light-emitting surface of the fingerprint detection light source 21 is parallel to the glass cover plate 11 of the display panel 10, that is, the fingerprint detection light source 21 and The glass cover plate 11 and the backlight module 30 are arranged in parallel.
  • the parallel arrangement mode can facilitate assembly, and the structural tolerances are also easier to control.
  • the light emitting surface of the fingerprint detection light source 21 may form an included angle with the glass cover 11 of the display panel 10.
  • the fingerprint detection light source 21 is located below the glass cover 11.
  • the fingerprint detection light source 21 and the liquid crystal layer 12 of the display panel 10 are arranged side by side.
  • An angle is formed between the light emitting surface of the fingerprint detection light source 21 and the glass cover 11.
  • the light emitting surface of the fingerprint detection light source 21 faces the glass cover 11.
  • the fingerprint detection area is tilted at a certain angle, so that the light emitted from the light emitting surface can be irradiated to the fingerprint detection area to the maximum extent, and the utilization rate of light is improved.
  • the light emitting surface of the fingerprint detection light source 21 and the glass cover 11 of the display panel 10 are arranged in parallel or at an included angle, and can be selected and set according to actual needs.
  • the fingerprint detection light source 21 may also be located on a side of the light guide plate 35 of the backlight module 30 facing the optical fingerprint recognition module 22, and the fingerprint detection light source 21 and the light guide plate 35 are located toward the optical fingerprint recognition module.
  • the backlight light sources 36 provided on one side of the group 22 are arranged side by side. Specifically, as shown in FIG. 6, a backlight light source 36 is provided on a side of the light guide plate 35 of the backlight module 30 facing the optical fingerprint recognition module 22, so that the fingerprint detection light source 21 is located on the backlight module 30 facing the optical fingerprint recognition module.
  • the fingerprint detection light source 21 and the backlight light source 36 are arranged side by side, it is possible to replace part of the light sources of the backlight light source 36 on the original light guide plate 35 side with the fingerprint detection light source 21, so that the backlight module can be guaranteed 30 performance, can also achieve fingerprint detection.
  • the fingerprint detection light source 21 may be attached to the substrate 50 or the glass cover 11, that is, the fingerprint detection light source 21 may be attached to the substrate 50 or the glass cover in parallel with the glass cover 11. On the plate 11, the fingerprint detection light source 21 may be attached to the substrate 50 or the glass cover 11 at an angle with the glass cover 11.
  • the optical glue 211 can be used for bonding, and the optical refractive index of the optical glue 211 is the same as that of the glass cover 11, which can reduce the light emitted by the fingerprint detection light source 21 on the glass cover.
  • the proportion of the lower surface that is reflected off effectively improves the utilization rate of the light source, so that the light emitted by the fingerprint detection light source 21 can be more directed to the finger.
  • one or more fingerprint detection light sources 21 may be used.
  • multiple fingerprint detection light sources 21 By setting the optical fingerprint recognition module 22 as the center of symmetry, or multiple fingerprint detection light sources 21 by setting the optical fingerprint recognition module 22 as the diagonal center, this can ensure that the finger is in the fingerprint detection area. Fingerprint detection effect under different angles.
  • setting the number of the fingerprint detection light sources 21 to multiple can help further increase the signal amount of fingerprint detection and improve the effect of fingerprint recognition.
  • the fingerprint detection light source 21 may also be a linear type.
  • the linear fingerprint detection light source 21 is disposed on one side of the optical fingerprint recognition module 22, which can also take into account the detection of a finger on the fingerprint. Fingerprint detection effect under different angles of the area.
  • the optical fingerprint recognition system under the screen further includes a filter layer 40.
  • the filter layer 40 is located between the optical fingerprint recognition module 22 and the backlight module 30. It also corresponds to the optical fingerprint identification module 22.
  • the detection light emitted from the fingerprint detection light source 21 is irradiated on the fingerprint detection area on the display panel 10, and is reflected by the finger.
  • the reflected detection light passes through the backlight module 30 and is irradiated on the optical fingerprint recognition module.
  • natural light in the environment or visible light in the backlight module 30 may be irradiated on the optical fingerprint recognition module 22, which will interfere with fingerprint recognition.
  • optical fingerprint recognition A filter layer 40 is provided between the module 22 and the rear module.
  • the filter layer 40 transmits and filters light entering the optical fingerprint recognition module 22.
  • the filter layer 40 is used for reflecting
  • the transmitted detection light passes through and filters out the visible light entering the fingerprint identification module, that is, when the reflected detection light enters the optical fingerprint identification module 22 through the filter layer 40, the filter layer 40 reacts to the reflected detection light.
  • It has good permeability and can filter out visible light in the environment, so that while ensuring optical fingerprint recognition, visible light can be prevented from entering the optical fingerprint recognition module 22 and affecting the optical fingerprint recognition module 2
  • the identification of 2 effectively avoids the interference of light in the environment on fingerprint detection, and improves the accuracy of fingerprint detection.
  • the filter layer 40 may include a filter, and the type of the filter may be selected according to the specific type of the fingerprint detection light source 21.
  • the fingerprint detection light source 21 is an infrared fingerprint detection light source 21.
  • the light is infrared light
  • the type of the filter is a filter that can transmit part of the infrared light corresponding to the light emitting frequency band of the infrared fingerprint detection light source 21 and filter out visible light and other infrared light, such as external environmental interference light and Visible light from backlight modules.
  • the infrared fingerprint detection light source may be specifically connected to the optical fingerprint recognition module 22 and controlled by the optical fingerprint recognition module 22 to emit infrared light with a specific wavelength.
  • the filter layer 40 includes an infrared cut-off filter layer, and the emission frequency band of the infrared fingerprint detection light source is at least partially outside the cut-off frequency band of the infrared cut-off filter layer.
  • the optical fingerprint recognition system includes an optical fingerprint recognition module 22 and a fingerprint detection light source 21.
  • the optical fingerprint recognition module 22 is located on a side of the backlight module 30 facing away from the display panel 10.
  • the light source 21 is used to emit detection light to the fingerprint detection area on the display panel 10, and the detection light is invisible light that can pass through the backlight module.
  • the detection light is reflected by the fingers on the detection area and passes through the backlight module 30 and enters.
  • the optical fingerprint recognition module 22 is configured to enable the optical fingerprint recognition module 22 to form a fingerprint image according to the reflected detection light.
  • the optical fingerprint recognition module 22 is disposed on the side of the backlight module 30 facing away from the display panel 10, and the detection light emitted by the fingerprint detection light source 21 can transmit the backlight module 30, so that the fingerprint detection
  • the detection light emitted by the light source 21 is reflected on the fingers of the fingerprint detection area, and the reflected detection light with fingerprint information can also pass through the backlight module 30 and shine on the optical fingerprint recognition module located behind the backlight module 30.
  • the optical fingerprint recognition module 22 can form a fingerprint image based on the reflected detection light, convert the fingerprint image into an electrical signal, and conduct fingerprint comparison and identification, thereby realizing the detection of the optical fingerprint.
  • the problem that the existing optical fingerprint recognition module is set on the side of the display module facing away from the display panel in the LCD mode, and the problem of under-screen fingerprint detection cannot be achieved.
  • the backlight module 30 includes: a diffusion film 32 that can transmit detection light, and the diffusion film 32 is used for backlighting.
  • the visible light emitted by the module 30 is atomized.
  • the diffusion film of the existing backlight module has a haze to visible light, infrared light and other non-visible light, so that the light emitted by the fingerprint detection light source cannot be imaged through the backlight module.
  • the detection light can be transmitted through
  • the diffuser film 32 passes through the diffuser film 32 and has a fogging effect on the visible light emitted by the backlight module 30.
  • the influence of the diffuser film 32 on the optical performance of the probe light is avoided. While not affecting the performance of the backlight module 30, it can be ensured that the detection light can pass through the diffusion film 32 well without affecting the performance of the detection light.
  • the backlight module 30 further includes: a reflective film 33 that allows detection light to pass through, the reflective film 33 is located on a side of the diffusion film 32 facing the optical fingerprint identification module 22, and the reflective film 33 is used for Reflects visible light.
  • the existing backlight module includes a reflective film, which has a good reflection effect on visible light and invisible light to ensure the performance of the backlight module.
  • the reflective film 33 is capable of transmitting the detection light.
  • the reflective film 33 has a good reflection effect on visible light. In this way, the probe light reflected by the finger can pass through the reflective film 33 after passing through the diffuser film 32. At the same time, it does not affect the performance of the reflective film 33. At the same time as the performance of the backlight module 30, it can transmit the detection light to realize the fingerprint detection.
  • the backlight module 30 further includes a steel plate 34, which is located on a side of the reflective film 33 facing the optical fingerprint recognition module 22, and the steel plate 34 corresponds to the position of the optical fingerprint detection module.
  • An opening 341 is provided through which the reflected detection light can pass.
  • the steel plates included in existing backlight modules are mostly steel plates that cannot transmit light, so that the light emitted by the fingerprint detection light source cannot be irradiated onto the optical fingerprint detection module through the backlight module.
  • an opening 341 is provided at a position corresponding to the steel plate 34 and the optical fingerprint detection module.
  • the opening 341 can be used to transmit the detection light after reflection. In this way, the detection light reflected by the finger is in turn.
  • the optical fingerprint detection module After passing through the diffusion film 32 and the reflection film 33, the optical fingerprint detection module can be irradiated through the opening 341 to realize fingerprint detection.
  • the backlight module 30 further includes: a light guide plate 35, which is located between the diffusion film 32 and the reflection film 33.
  • the light guide plate 35 may be a light guide plate in the prior art. Specifically, For the setting method, refer to the prior art, which will not be repeated in this embodiment.
  • a prism film is further provided on the side of the diffusion film facing the display panel, and the prism film has the effect of scattering and splitting visible light.
  • the backlight module No prism film is provided in 30, so that the influence of the prism film on the optical performance of the detection light when the detection light passes through the backlight module 30 can be avoided, and the detection light can pass through the diffusion film 32 without affecting the detection. Light performance.
  • the display panel 10 includes a glass cover plate 11 and a liquid crystal layer 12.
  • the optical fingerprint identification module 22 is located on a side of the backlight module 30 facing away from the display panel 10, and the optical fingerprint identification module 22 and the backlight module 30. There is a filter layer 40 therebetween.
  • the fingerprint detection light source 21 may be located below the glass cover 11 and disposed side by side with the liquid crystal layer 12; or as shown in FIG. 1, the fingerprint detection light source 21 is located in a backlight module.
  • the side facing away from the display panel 10, the fingerprint detection light source 21 and the optical fingerprint detection module are both disposed on the substrate 50.
  • the backlight module 30 includes a diffusion film 32 that can transmit detection light, a reflection film 33 that can transmit detection light, and a steel plate 34, and the steel plate 34
  • the position corresponding to the optical fingerprint detection module is provided with an opening 341 through which the reflected detection light can pass, so that the detection light reflected by the finger can sequentially pass through the diffusion film 32, the reflection film 33, and
  • the opening 341 in the steel plate 34 is irradiated on the optical fingerprint recognition module 22, that is, the backlight module 30 is irradiated on the optical fingerprint recognition module 22 behind the backlight module 30 to realize fingerprint detection.
  • FIG. 12 is a schematic structural diagram of an optical fingerprint recognition system under the screen provided in Embodiment 3 of the present invention
  • FIG. 13 is a schematic structural diagram of another optical fingerprint recognition system under the screen provided in Embodiment 3 of the present invention.
  • the backlight module 30 further includes: a brightness enhancement film 31 that can transmit the detection light.
  • a brightness enhancement film 31 that can transmit the detection light.
  • the backlight module 30 It also includes a brightness enhancement film 31 that can transmit the detection light.
  • the brightness enhancement film 31 is located on the side of the diffusion film 32 facing the display panel 10. The brightness enhancement film 31 is used to enhance the brightness of visible light.
  • the detection light can pass through the brightness enhancement film 31, and at the same time, the brightness enhancement film 31 has the effect of enhancing the brightness of the visible light emitted by the backlight module 30, so that the detection light can be prevented from passing through the backlight module 30 At this time, the brightness enhancement film 31 has an effect on scattering and spectroscopic effects of the detection light, so that there is no distortion of the fingerprint image formed by the detection light after passing through the brightness enhancement film 31. While enhancing the optical performance of the backlight module 30, the detection can be guaranteed Light can pass through the brightness enhancement film 31 well, and realize fingerprint detection.
  • the brightness-enhancing film 31 may use a non-prism structure film structure to enhance the brightness of the backlight module, so as to prevent the detection light from scattering the detection light when the detection light passes through the backlight module 30 And spectral effects, so that there is no distortion of the fingerprint image formed by the detection light after passing through the brightness enhancement film 31.
  • the brightness enhancement film 31 includes multiple optical material layers, and the optical material layer is composed of an optical material with a low dispersion coefficient.
  • the brightness enhancement film 31 is formed by stacking multiple optical material layers, and the optical material layer It is made of optical material with low dispersion coefficient.
  • the chemical material layer with low dispersion coefficient can ensure that different colors of light are emitted from the brightness enhancement film 31 at the same angle.
  • the dispersion coefficient (ie Abbe number) of the optical material layer is inversely proportional to the refractive index, and the higher the dispersion coefficient, the better the LCD display effect. However, if a higher dispersion coefficient is used, the overall optical material layer may increase.
  • the dispersion coefficient of the optical material layer may be considered in a compromise between 30 and 60, and may be specifically determined according to actual product design requirements.
  • the refractive index of the multilayer optical material layer sequentially increases from the direction of the diffusion film 32 to the display panel 10, that is, the multilayer optical material layer gradually increases with the refractive index from the direction of the diffusion film 32 to the display panel 10. This way, the high-angle light emitted by the diffuser film 32 can be finally converted into near-vertical light, thereby increasing the brightness of the backlight module 30 in the axial direction and enhancing the brightness of the light emitted by the backlight module 30. .
  • the display panel 10 includes a glass cover plate 11 and a liquid crystal layer 12.
  • the optical fingerprint identification module 22 is located on a side of the backlight module 30 facing away from the display panel 10, and the optical fingerprint identification module 22 and the backlight module 30. There is a filter layer 40 therebetween.
  • the fingerprint detection light source 21 may be located below the glass cover 11 and disposed side by side with the liquid crystal layer 12; or, as shown in FIG. 12, the fingerprint detection light source 21 is located in the backlight module.
  • the side facing away from the display panel 10, the fingerprint detection light source 21 and the optical fingerprint detection module are both disposed on the substrate 50.
  • An under-screen optical fingerprint recognition system provided in this embodiment, by enabling the backlight module 30 to further include a brightness enhancement film 31 that can transmit detection light, the brightness enhancement film 31 is located on a side of the diffusion film 32 facing the display panel 10, The brightness enhancement film 31 is used to enhance the brightness of visible light. That is, in this embodiment, the detection light can pass through the brightness enhancement film 31, and at the same time, the brightness enhancement film 31 has the effect of enhancing the brightness of the visible light emitted by the backlight module 30, so that the detection light can be prevented from passing through the backlight module 30 At this time, the brightness enhancement film 31 has an effect on scattering and spectroscopic effects of the detection light, so that there is no distortion of the fingerprint image formed by the detection light after passing through the brightness enhancement film 31. While enhancing the optical performance of the backlight module 30, the detection can be guaranteed Light can pass through the brightness enhancement film 31 well, and realize fingerprint detection.
  • FIG. 14 is a schematic structural diagram of an under-screen optical fingerprint recognition system according to a fourth embodiment of the present invention.
  • the optical fingerprint recognition module 22 includes an optical element 221 and a fingerprint image sensor 222, and the optical element 221 is located on the fingerprint image sensor 222 toward the backlight mode.
  • the optical element 221 is disposed on the back module and the fingerprint image sensor 222.
  • the optical element 221 is disposed at a position corresponding to the fingerprint image sensor 222.
  • the optical element 221 can modulate the reflected detection light with fingerprint information, so that the detection light enters after modulation
  • the fingerprint image sensor 222 improves the accuracy and detection effect of fingerprint recognition.
  • the detection light is reflected on the fingers of the fingerprint detection area of the display panel 10, and the reflected detection light passes through the backlight module 30 and the optical element 221 in sequence and enters the fingerprint image sensor 222 to form a fingerprint image.
  • the fingerprint image sensor 222 converts the fingerprint The image is converted into an electrical signal, which can be used for fingerprint comparison and fingerprint identification. At the same time, it helps to improve the accuracy of fingerprint detection and the effect of fingerprint recognition.
  • the optical element 221 may be a lens, a collimating hole layer, an aperture, and the like.
  • the optical fingerprint recognition system under the screen further includes a filter layer 40, and the filter layer 40 may be located between the optical fingerprint recognition module 22 and the backlight module 30, and is in contact with the optical fingerprint recognition module.
  • the filter layer 40 may be located between the optical element 221 and the backlight module 30.
  • the filter layer 40 is used to transmit the emitted detection light and filter out the fingerprint detection module. Visible light, the detection light is reflected by the finger after it reaches the fingerprint detection area. After the reflected detection light passes through the backlight module 30, it passes through the filter layer 40 and the optical element 221 into the fingerprint image sensor 222.
  • the filter layer 40 can filter In addition to the visible light in the environment, while ensuring the optical fingerprint recognition, the visible light in the environment is prevented from entering the fingerprint image sensor 222 through the optical element 221, affecting the recognition of the optical fingerprint recognition module 22, and improving the accuracy of fingerprint detection. degree.
  • the filter layer 40 may also be located between the optical element 221 and the fingerprint image sensor 222, and the filter layer 40 corresponds to the fingerprint image sensor 222.
  • a finger that is irradiated by the detection light onto the fingerprint detection area is reflected. After the reflected detection light passes through the backlight module 30, it passes through the optical element 221 and the filter layer 40 in order to enter the fingerprint image sensor 222.
  • the filter layer 40 can filter out visible light in the environment, so as to ensure the realization of optical fingerprints At the same time, the visible light in the environment is prevented from entering the fingerprint image sensor 222 through the optical element 221, affecting the recognition of the optical fingerprint recognition module 22, and improving the accuracy of fingerprint detection.
  • the filter layer 40 may be integrated on the optical element 221 or the fingerprint image sensor 222 in an IC integration manner, or may be attached to the optical element 221 or the fingerprint image sensor 222 in an independent setting manner.
  • the under-screen optical fingerprint recognition system further includes a light-transmissive bonding layer for bonding the filter layer to the optical element, wherein the light-transmissive bonding
  • the layer is a light-transmitting material with a low refractive index, which has good light transmittance and a low refractive index. This can ensure a good fixation between the filter layer and the optical element, and also ensure the modulation effect of the optical element. Not affected.
  • the type of the filter layer reference may be made to the first embodiment, which is not repeated in this embodiment.
  • the fingerprint detection light source may be an infrared fingerprint detection light source.
  • the position of the fingerprint detection light source may be located under the glass cover of the display panel, and the fingerprint detection light source is disposed side by side with the liquid crystal layer of the display panel;
  • the light emitting surface of the fingerprint detection light source and the glass cover of the display panel may be parallel, or the light emitting surface of the fingerprint detection light source may form an angle with the glass cover of the display panel.
  • the fingerprint detection light source may be one or more, and a plurality of fingerprint detection light sources are provided with the optical fingerprint recognition module as a symmetrical center or a diagonal center.
  • the fingerprint detection light source may be a linear type, and the linear fingerprint detection light source may be disposed on one side of the optical fingerprint recognition module.
  • the specific type and setting method of the fingerprint detection light source refer to the first embodiment, which will not be repeated in this embodiment.
  • the under-screen optical fingerprint recognition system may further include a substrate 50, which is located on a side of the backlight module 30 facing away from the display panel 10, and the fingerprint detection light source 21 and the optical fingerprint recognition module 22 are disposed on the substrate 50. One side facing the backlight module 30.
  • the substrate 50 is used to provide a setting place for the fingerprint detection light source 21 and the optical fingerprint recognition module 22.
  • the substrate 50 may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the backlight module may include: a diffusion film that transmits detection light, a reflection film that transmits detection light, and a steel plate, and the steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass; the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • a diffusion film that transmits detection light
  • a reflection film that transmits detection light
  • a steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass
  • the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • a brightness enhancement film that can transmit the detection light.
  • the optical fingerprint recognition system includes an optical fingerprint recognition module 22 including an optical element 221 and a fingerprint image sensor 222, and the optical element 221 is located on a side of the fingerprint image sensor 222 facing the backlight module 30.
  • the optical element 221 can modulate the reflected detection light with fingerprint information, so that it enters the fingerprint image sensor 222 after modulation, thereby improving the accuracy and detection effect of fingerprint recognition.
  • the detection light is reflected on the fingers of the fingerprint detection area of the display panel 10, and the reflected detection light passes through the backlight module 30, and then enters the fingerprint image sensor 222 through the optical element 221 to form a fingerprint image. Realize the recognition of optical fingerprints, and at the same time help to improve the accuracy of fingerprint detection and enhance the effect of fingerprint recognition.
  • FIG. 15 is a schematic structural diagram of an under-screen optical fingerprint recognition system provided by Embodiment 5 of the present invention.
  • the optical element 221 of the optical fingerprint recognition module 22 includes a lens
  • the modified lens may include at least one aspherical lens.
  • the convex end of one of the aspheric lenses is set towards the fingerprint image sensor 222.
  • the lens has a strong light-gathering ability. The returned light passes through the lens and is imaged, so that the imageable breadth range is larger and the formed fingerprint image is more accurate and specific . That is, in this embodiment, the lens can be used for converging the returned light to the fingerprint image sensor to increase the viewing angle of the optical fingerprint recognition module.
  • the lens is disposed between the backlight module 30 and the fingerprint image sensor 222, and the lens Located at a position corresponding to the fingerprint image sensor 222, the detection light is reflected on the fingers of the fingerprint detection area of the display panel 10, and the reflected detection light passes through the backlight module 30, and then enters the fingerprint image sensor 222 through the lens.
  • the fingerprint image sensor 222 converts the fingerprint image into an electrical signal, which can be used for fingerprint comparison and recognition of optical fingerprints. At the same time, it can be imaged after the modulation of the lens, which has a wide imaging range and forms More accurate fingerprint images can help improve the accuracy of fingerprint detection.
  • the under-screen optical fingerprint recognition system further includes a filter layer 40.
  • the filter layer 40 may be located between the lens and the fingerprint image sensor 222, or may be located between Between the lens and the back module, and the filter layer 40 corresponds to the fingerprint image sensor 222, the detection light reflected by the finger after passing through the backlight module 30 passes through the lens and the filter layer 40 in order and enters the fingerprint image sensor In 222, at the same time, the filter layer 40 can filter out visible light in the environment, so as to ensure the realization of optical fingerprint recognition, it can prevent visible light in the environment from entering the fingerprint image sensor 222 through the optical element 221, affecting the optical fingerprint recognition module.
  • the identification of 22 improves the accuracy of fingerprint detection.
  • the filter layer 40 may be integrated on the fingerprint image sensor 222 or the lens in an IC integrated manner, or may be attached to the fingerprint image sensor 222 or the lens in an independent setting manner.
  • the filter layer 40 when the filter layer 40 is bonded to the lens, the two can be bonded through a light-transmissive, low-refractive-index bonding layer, so as to ensure a good fixation between the filter layer and the lens, it can also ensure that The focusing effect of the lens is not affected.
  • the type of the filter layer reference may be made to the first embodiment, which is not repeated in this embodiment.
  • the fingerprint detection light source may be an infrared fingerprint detection light source.
  • the position of the fingerprint detection light source may be located under the glass cover of the display panel, and the fingerprint detection light source is disposed side by side with the liquid crystal layer of the display panel; or, the fingerprint detection light source may also be located on the side of the backlight module facing away from the display panel.
  • the light emitting surface of the fingerprint detection light source and the glass cover of the display panel may be parallel, or the light emitting surface of the fingerprint detection light source may form an angle with the glass cover of the display panel.
  • the fingerprint detection light source may be one or more, and a plurality of fingerprint detection light sources are provided with the optical fingerprint recognition module as a symmetrical center or a diagonal center.
  • the fingerprint detection light source may be a linear type, and the linear fingerprint detection light source may be disposed on one side of the optical fingerprint recognition module.
  • the specific type and setting method of the fingerprint detection light source refer to the first embodiment, which will not be repeated in this embodiment.
  • the under-screen optical fingerprint recognition system may further include a substrate, the substrate is located on a side of the backlight module facing away from the display panel, and the fingerprint detection light source and the optical fingerprint recognition module are disposed on a side of the substrate facing the backlight module .
  • the substrate is used to provide a setting place for a fingerprint detection light source and an optical fingerprint recognition module.
  • the substrate may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the backlight module may include: a diffusion film that transmits detection light, a reflection film that transmits detection light, and a steel plate, and the steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass; the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • a diffusion film that transmits detection light
  • a reflection film that transmits detection light
  • a steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass
  • the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • An optical fingerprint recognition system under the screen provided in this embodiment by enabling the optical element 221 to include at least one aspheric lens, the lens is used to focus detection light on a fingerprint image sensor, thereby increasing the field of view of the optical fingerprint recognition module. angle.
  • the strong light-condensing ability of the lens is used to enlarge the imaging breadth and the fingerprint image formed is more accurate.
  • the detection light reflected by the finger passes through the backlight module 30 and then enters the fingerprint through the lens.
  • the image sensor 222 is used to form a fingerprint image to realize the identification of an optical fingerprint. At the same time, it is imaged after being modulated by the lens, which has a wider imaging range and forms a more accurate fingerprint image, which helps to improve the accuracy of fingerprint detection.
  • FIG. 16 is a schematic structural diagram of an under-screen optical fingerprint recognition system provided in Embodiment 6 of the present invention
  • FIG. 17 is a structural schematic diagram of another under-screen optical fingerprint recognition system provided in Embodiment 6 of the present invention
  • FIG. 18 is the present invention
  • the optical element 221 includes a collimating hole layer, and a plurality of parallel light-transmitting holes 223 are opened on the collimating hole layer. So that the reflected detection light passes through the backlight module and is projected on the fingerprint image sensor 222 through the light transmission hole 223.
  • a light of a specific angle can be selected The transmission prevents the remaining light from participating in the imaging, avoids the interference of mixed light on the fingerprint imaging, effectively improves the sharpness of the fingerprint image, and improves the accuracy of fingerprint recognition.
  • the collimating hole layer is disposed between the backlight module 30 and the fingerprint image sensor 222, and the collimating hole layer is located at a position corresponding to the fingerprint image sensor 222.
  • the detection light reflected by the finger passes through the backlight module 30. After that, it enters the fingerprint image sensor 222 through the light transmission hole 223 on the collimation hole layer to form a fingerprint image, and realizes the identification of the optical fingerprint.
  • the fingerprint image is effectively improved To improve the accuracy of fingerprint recognition.
  • the collimating hole layer is formed of an opaque photoresist material, and a light-transmitting light-transmitting hole 223 is opened thereon to realize selective transmission of light. Too.
  • the aperture size and depth of the light-transmitting hole 223 can be set according to the required degree of collimation of the collimating hole layer. In this embodiment, the ratio of the hole diameter and the hole depth of the light-transmitting hole 223 is greater than 5, which can ensure the formation of Fingerprint images with good image quality ensure the realization of optical fingerprint recognition.
  • the under-screen optical fingerprint recognition system further includes a filter layer 40, and the filter layer 40 may be located between the collimation hole layer and the fingerprint image sensor 222. It can also be located between the collimation hole layer and the backlight module 30, and the filter layer 40 corresponds to the position of the fingerprint image sensor 222.
  • the filter layer 40 can filter out the visible light in the environment. This ensures the realization of optical fingerprint recognition and prevents the visible light in the environment from transmitting through.
  • the light hole 223 enters the fingerprint image sensor 222, which affects the recognition of the optical fingerprint recognition module 22 and improves the accuracy of fingerprint detection.
  • the filter layer 40 may be integrated on the fingerprint image sensor 222 or the collimating hole layer in an IC integration manner, or may be attached to the fingerprint image sensor 222 or the collimating hole layer in an independent setting manner.
  • the type of the filter layer 40 reference may be made to the first embodiment, which is not repeated in this embodiment.
  • the fingerprint detection light source may be an infrared fingerprint detection light source.
  • the position of the fingerprint detection light source may be located under the glass cover of the display panel, and the fingerprint detection light source and the liquid crystal layer of the display panel are arranged side by side; or the fingerprint detection light source may also be located on the side of the backlight module facing away from the display panel.
  • the light emitting surface of the fingerprint detection light source and the glass cover of the display panel may be parallel, or the light emitting surface of the fingerprint detection light source may form an angle with the glass cover of the display panel.
  • the fingerprint detection light source may be one or more, and a plurality of fingerprint detection light sources are provided with the optical fingerprint recognition module as a symmetrical center or a diagonal center.
  • the fingerprint detection light source may be a linear type, and the linear fingerprint detection light source may be disposed on one side of the optical fingerprint recognition module.
  • the specific type and setting method of the fingerprint detection light source refer to the first embodiment, which will not be repeated in this embodiment.
  • the under-screen optical fingerprint recognition system may further include a substrate, the substrate is located on a side of the backlight module facing away from the display panel, and the fingerprint detection light source and the optical fingerprint recognition module are disposed on a side of the substrate facing the backlight module .
  • the substrate is used to provide a setting place for a fingerprint detection light source and an optical fingerprint recognition module.
  • the substrate may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the backlight module may include: a diffusion film that transmits detection light, a reflection film that transmits detection light, and a steel plate, and the steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass; the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • a diffusion film that transmits detection light
  • a reflection film that transmits detection light
  • a steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass
  • the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • This embodiment provides an under-screen optical fingerprint recognition system.
  • the optical element 221 to include a collimating hole layer, a plurality of light-transmitting holes 223 are opened on the collimating hole layer, so that when light passes through the collimating hole layer, light is transmitted.
  • the hole 223 can selectively allow optical transmission parallel to the axial direction of the light-transmissive hole 223 to avoid the interference of mixed light on the imaging of the fingerprint, effectively improving the sharpness of the fingerprint image and the accuracy of fingerprint recognition.
  • After the reflected detection light passes through the backlight module 30, it enters the fingerprint image sensor 222 through the light transmission hole 223 on the collimation hole layer to form a fingerprint image, thereby realizing the identification of the optical fingerprint and passing through the collimation hole. Through selection, the sharpness of the fingerprint image is effectively improved, and the accuracy of fingerprint recognition is improved.
  • FIG. 19 is a schematic structural diagram of an under-screen optical fingerprint recognition system provided in Embodiment 7 of the present invention
  • FIG. 20 is a structural schematic diagram of another under-screen optical fingerprint recognition system provided in Embodiment 7 of the present invention
  • FIG. 21 is the present invention
  • a schematic structural diagram of a microlens layer in another in-screen optical fingerprint recognition system provided in Embodiment 7 is shown in FIG. 22.
  • FIG. 22 is a partial enlarged structural diagram of an in-screen optical fingerprint recognition system provided in Embodiment 7 of the present invention.
  • FIG. 24 is a schematic partial enlarged structure of another optical fingerprint recognition system under the screen provided in Embodiment 7 of the present invention.
  • the optical element 221 includes a microlens layer 224 and a diaphragm layer 225.
  • the microlens layer 224 and the light A light-transmitting material layer is disposed between the aperture layers 225, wherein the microlens layer 224 is disposed on the side of the aperture layer 225 facing the backlight module 30, and the convex end of the microlens layer 224 faces the backlight module 30, wherein the microlenses
  • the layer 224 has a strong light-condensing property, which can expand the breadth of imaging and make the fingerprint image more accurate.
  • the diaphragm layer 225 includes a diaphragm plate.
  • a plurality of diaphragm holes 226 are formed in parallel on the diaphragm plate, so that the reflected detection light passes through the backlight module 30, and then The micro-lens layer 224, the light-transmitting material layer, and the aperture hole 226 are irradiated on the fingerprint image sensor 222 in this order. In this way, when the aperture hole 226 on the aperture plate is optically transmitted, the light-transmitting aperture hole 226 acts on the light.
  • the optical element 221 includes a microlens layer 224 and an aperture layer 225 and the reflected detection light is transmitted through the backlight module 30, first After passing through the microlens layer 224, and then through the aperture hole 226 of the aperture layer 225, it is selectively transmitted into the fingerprint image sensor 222, that is, it is imaged after passing through the lens and the aperture layer 225 in order to expand the imaging breadth while improving the fingerprint image. Clarity further improves the accuracy of optical fingerprint recognition.
  • the optical element 221 includes a microlens layer 224 and an aperture layer 225.
  • the thickness of the aperture layer 225 is smaller, the imaging distance required by the microlens layer 224 is longer. Smaller, making the formed optical element 221 thinner, thereby making the entire optical fingerprint recognition system thinner, helping to meet the increasingly thinning requirements of electronic devices, and imaging through the micro lens and the aperture layer 225, has a higher The collimation degree is also clearer.
  • the detection light irradiated on the fingers of the fingerprint detection area of the display panel 10 is reflected.
  • the reflected detection light passes through the backlight module 30, it first passes through the microlens layer 224 and the light-transmitting material.
  • the aperture hole 226 of the diaphragm layer 225 penetrates into the fingerprint image sensor 222 to form a fingerprint image, realizes the identification of the optical fingerprint, and sequentially images after modulation by the micro lens layer 224 and the diaphragm layer 225, while expanding the imaging breadth range , Improves the sharpness of the fingerprint image, and effectively improves the accuracy of fingerprint recognition.
  • the microlens layer 224 is formed by juxtaposing a plurality of microlenses. There are no other requirements for the material type of the light-transmitting material, as long as the light-transmitting property does not affect the transmission of light.
  • the diaphragm layer 225 may include a plurality of diaphragm plates arranged in layers, so that light is processed. After multiple selections, it passes through the fingerprint image sensor 222, effectively improving the sharpness of the formed fingerprint image.
  • the under-screen optical fingerprint recognition system further includes a filter layer 40, and the filter layer 40 may be located between the diaphragm layer 225 and the fingerprint image sensor 222. It can also be located between the microlens layer 224 and the backlight module 30, and the filter layer 40 corresponds to the position of the fingerprint image sensor 222.
  • the filter layer 40 can filter out visible light in the environment. This ensures that optical fingerprint recognition is achieved while avoiding visible light in the environment. Entering the fingerprint image sensor 222 affects the recognition of the optical fingerprint recognition module 22 and improves the accuracy of fingerprint detection.
  • the filter layer 40 may be integrated on the fingerprint image sensor 222 or the microlens layer 224 in an IC integration manner, or may be attached to the fingerprint image sensor 222 or the microlens layer 224 in an independent setting manner.
  • the filter layer 40 and the microlens layer 224 are bonded, as shown in FIG. 24, the two can be bonded by a light-transmissive, low-refractive-index bonding layer 227 to ensure the filter layer 40.
  • the filter layer 40 reference may be made to the first embodiment, which is not repeated in this embodiment.
  • the fingerprint detection light source may be an infrared fingerprint detection light source.
  • the position of the fingerprint detection light source may be located under the glass cover of the display panel, and the fingerprint detection light source is disposed side by side with the liquid crystal layer of the display panel;
  • the light emitting surface of the fingerprint detection light source and the glass cover of the display panel may be parallel, or the light emitting surface of the fingerprint detection light source may form an angle with the glass cover of the display panel.
  • the fingerprint detection light source may be one or more, and a plurality of fingerprint detection light sources are provided with the optical fingerprint recognition module as a symmetrical center or a diagonal center.
  • the fingerprint detection light source may be a linear type, and the linear fingerprint detection light source may be disposed on one side of the optical fingerprint recognition module.
  • the specific type and setting method of the fingerprint detection light source refer to the first embodiment, which will not be repeated in this embodiment.
  • the under-screen optical fingerprint recognition system may further include a substrate.
  • the substrate is located on a side of the backlight module facing away from the display panel, and the fingerprint detection light source and the optical fingerprint recognition module are disposed on a side of the substrate facing the backlight module. .
  • the substrate is used to provide a setting place for a fingerprint detection light source and an optical fingerprint recognition module.
  • the substrate may be an FPC soft board or a PCB hard board, which is not limited in this embodiment.
  • the backlight module may include: a diffusion film that transmits detection light, a reflection film that transmits detection light, and a steel plate, and the steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass; the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • a diffusion film that transmits detection light
  • a reflection film that transmits detection light
  • a steel plate is provided at a position corresponding to the optical fingerprint detection module. Openings through which the reflected detection light can pass
  • the backlight module can further include: a brightness enhancement film that can transmit the detection light.
  • An under-screen optical fingerprint recognition system provided in this embodiment is provided by using an optical element 221 including a microlens layer 224 and an aperture layer 225, a light-transmitting material layer is provided between the microlens layer 224 and the aperture layer 225, and the micro
  • the lens layer 224 is located on the side of the diaphragm layer 225 facing the backlight module 30, and the convex end of the micro lens layer 224 faces the backlight module 30;
  • the diaphragm layer 225 includes a diaphragm plate, and a plurality of mutual Parallel aperture holes 226, so that after the reflected detection light passes through the backlight module 30, it passes through the microlens layer 224 and the light-transmitting material layer and passes through the aperture hole 226 to illuminate the fingerprint image sensor 222, After imaging through the lens and the aperture layer 225, while expanding the imaging breadth, the clarity of the fingerprint image is improved, and the accuracy of the optical fingerprint recognition is further improved.
  • the electronic device includes an under-screen optical fingerprint recognition system in any of the above embodiments.
  • the electronic device may be a liquid crystal display device, an electronic paper, a mobile phone, a tablet computer, a television, or a notebook computer. , Digital photo frames, navigators, fingerprint locks and other electronic products or components.

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Abstract

本发明提供一种屏下光学指纹识别系统及电子装置,该屏下光学指纹识别系统包括:光学指纹识别模组和指纹检测光源,光学指纹识别模组位于背光模组背离显示面板的一侧,指纹检测光源用于向显示面板上的指纹检测区域发射探测光,该探测光为可透过背光模组的非可见光,且探测光经检测区域上的手指反射后透过背光模组并进入光学指纹识别模组,以使光学指纹识别模组根据反射后的探测光形成指纹图像。指纹检测光源发射的探测光照射到指纹检测区域的手指上反射,则带有指纹信息的、反射后的探测光也能够透过背光模组,并照射在位于背光模组后的光学指纹识别模组上,光学指纹识别模组就能够根据该反射后的探测光形成指纹图像,从而实现了光学指纹的检测。

Description

屏下光学指纹识别系统及电子装置 技术领域
本申请涉及指纹识别技术领域,尤其涉及一种屏下光学指纹识别系统及电子装置。
背景技术
指纹识别技术是指通过指纹识别模组感应、分析指纹的谷和脊的信号来识别指纹信息,具有安全性高,且操作方便快捷的优点,而被广泛的应用于电子产品中。指纹成像技术的实现方式有光学成像、电容成像、超声成像等多种技术,其中,光学指纹识别技术因其具有穿透能力强、支持全屏摆放、产品结构设计简单等特点,而逐渐成为指纹识别技术的主流,被广泛的应用于电子装置中。
目前,光学指纹识别模组在显示屏中设置时,光学识别模组位于显示屏下,具体的,如在OLED屏下模式中,由于OLED显示模组为自发光型,期显示模组本身具备透光性,光学指纹检测模组可设置在显示模组背离显示面板的一侧,在进行指纹检测时,可利用屏幕自身发出的光照射手指后形成返回光,该返回光经过显示模组后照射在光学指纹识别模组上,以进行指纹的识别。
然而,在LCD显示屏模式下,将光学指纹检测模组可设置在显示模组背离显示面板的一侧,由于背光模组内的钢板以及反射膜不透光,而且背光模组内的扩散膜对光线也有雾化效果,增光膜对光线还有方向约束特性,从而导致无法实现指纹检测。
发明内容
本发明提供一种屏下光学指纹识别系统及电子装置,以解决现有光学指纹识别模组在LCD模式下,设置在显示模组背离显示面板的一侧,无法实现屏下指纹检测的问题。
本发明的第一方面提供一种屏下光学指纹识别系统,应用于具有背光模 组和显示面板的电子装置,其中,所述背光模组用于向所述显示面板提供可见光以使所述显示面板显示画面,所述屏下光学指纹识别系统包括:光学指纹识别模组和指纹检测光源;
其中,所述光学指纹识别模组位于所述背光模组背离所述显示面板的一侧,所述指纹检测光源用于向所述显示面板上的指纹检测区域发射探测光,所述探测光为可透过所述背光模组的非可见光,且所述探测光经所述检测区域上的手指反射后透过所述背光模组并进入所述光学指纹识别模组,以使所述光学指纹识别模组根据反射后的所述探测光形成指纹图像。
在本发明实施例的具体实施方式中,所述背光模组包括:可使所述探测光透过的扩散膜,所述扩散膜用于对所述背光模组发出的可见光进行雾化。
在本发明实施例的具体实施方式中,所述背光模组还包括:可使所述探测光透过的反射膜,所述反射膜位于所述扩散膜朝向所述光学指纹识别模组的一侧,所述反射膜用于对所述可见光进行反射。
在本发明实施例的具体实施方式中,所述背光模组还包括:钢板,所述钢板位于所述反射膜朝向所述光学指纹识别模组的一侧,且所述钢板与所述光学指纹检测模组相对应的位置处设有可供反射后的所述探测光透过的开孔。
在本发明实施例的具体实施方式中,所述背光模组还包括:可使所述探测光透过的增亮膜,所述增亮膜位于所述背光模组的扩散膜朝向所述显示面板的一侧,所述增亮膜用于对所述可见光起到增强亮度的效果。
在本发明实施例的具体实施方式中,所述增亮膜采用非棱镜结构的膜层结构来增强所述背光模组的亮度。
在本发明实施例的具体实施方式中,所述增亮膜包括多层光学材料层,所述光学材料层由低色散系数的光学材料构成。
在本发明实施例的具体实施方式中,所述光学材料层的色散系数在30-60之间。
在本发明实施例的具体实施方式中,所述多层光学材料层的折射率从所述扩散膜到所述显示面板的方向依次增加。
在本发明实施例的具体实施方式中,所述背光模组还包括:导光板,所述导光板位于所述背光模组的扩散膜与所述背光模组的反射膜之间。
在本发明实施例的具体实施方式中,所述指纹检测光源位于所述显示面 板的玻璃盖板下方,且所述指纹检测光源与所述显示面板的液晶层并排设置;或者,
所述指纹检测光源位于所述背光模组背离所述显示面板的一侧。
在本发明实施例的具体实施方式中,所述背光模组的导光板朝向所述光学指纹识别模组的一侧上设有背光光源,所述指纹检测光源位于所述导光板朝向所述光学指纹识别模组的一侧,且所述指纹检测光源与位于所述导光板朝向所述光学指纹识别模组一侧设置的背光光源并排设置。
在本发明实施例的具体实施方式中,还包括基板,所述基板位于所述背光模组背离所述显示面板的一侧,且所述指纹检测光源、所述光学指纹识别模组设置在所述基板朝向所述背光模组的一面上。
在本发明实施例的具体实施方式中,所述指纹检测光源的出光面与所述显示面板的玻璃盖板平行,或者所述指纹检测光源的出光面与所述显示面板的玻璃盖板之间形成夹角。
在本发明实施例的具体实施方式中,所述光学指纹识别模组包括光学元件和指纹图像传感器,所述光学元件位于所述指纹图像传感器朝向所述背光模组的一侧,且所述光学元件设置在与所述指纹图像传感器相应位置处,反射后的所述探测光透过所述背光模组后透过所述光学元件且进入所述指纹图像传感器以形成指纹图像。
在本发明实施例的具体实施方式中,所述光学元件包括至少一个非球面透镜,所述透镜用于将所述探测光汇聚到所述指纹图像传感器,以增大所述光学指纹识别模组的视场角。
在本发明实施例的具体实施方式中,所述光学元件包括准直孔层,所述准直孔层上开设多个相互平行的透光孔,以使反射后的所述探测光透过所述背光模组后经过所述透光孔投射在指纹图像传感器上。
在本发明实施例的具体实施方式中,所述光学元件包括:微透镜层和光阑层,所述微透镜层与所述光阑层之间设置有透光材料层,所述微透镜层位于所述光阑层朝向所述背光模组的一侧,且所述微透镜层凸起的一端朝向所述背光模组;
所述光阑层包括光阑板,所述光阑板上开设有多个相互平行的光阑孔,以使反射后的所述探测光透过所述背光模组后依次经过所述微透镜层、所述 透光材料层以及所述光阑孔照射在所述指纹图像传感器上。
在本发明实施例的具体实施方式中,所述光阑层包括多层层叠设置的光阑板。
在本发明实施例的具体实施方式中,所述指纹检测光源为红外指纹检测光源,且所述红外指纹检测光源连接到所述光学指纹识别模组并由所述光学指纹识别模组控制以发出特定波长的红外光。
在本发明实施例的具体实施方式中,还包括滤光层,所述滤光层位于所述光学指纹识别模组和所述背光模组之间且与所述光学指纹识别模组相对应;或者,所述滤光层位于所述光学指纹识别模组的光学元件和指纹图像传感器之间且与所述指纹图像传感器相对应。
在本发明实施例的具体实施方式中,所述滤光层包括红外截止滤光层,且所述红外指纹检测光源的发光频段至少部分位于所述红外截止滤光层的截止频段之外。
在本发明实施例的具体实施方式中,还包括可透光的贴合层,所述贴合层用于将所述滤光层与所述光学元件贴合。
在本发明实施例的具体实施方式中,所述指纹检测光源为一个或多个,多个所述指纹检测光源以所述光学指纹识别模组为对称中心或对角线中心的方式设置;或者,
所述指纹检测光源为直线型,所述指纹检测光源位于所述光学指纹识别模组的一侧。
本发明的第二方面提供一种电子装置,包括上述任一所述的屏下光学指纹识别系统。
本发明提供的一种屏下光学指纹识别系统及电子装置,通过使该屏下光线指纹识别系统包括光学指纹识别模组和指纹检测光源,该光学指纹识别模组位于背光模组背离显示面板的一侧,指纹检测光源用于向显示面板上的指纹检测区域发射探测光,并使该探测光为可透过背光模组的非可见光,且探测光经检测区域上的手指反射后透过背光模组并进入光学指纹识别模组,以使光学指纹识别模组根据反射后的探测光形成指纹图像。即在本实施例中,将光学指纹识别模组设置在背光模组背离显示面板的一侧,通过使指纹检测光源发出的探测光能够透光背光模组,这样,指纹检测光源发射的探测光照 射到指纹检测区域的手指上反射,则带有指纹信息的反射后的探测光也能够透过背光模组,并照射在位于背光模组后的光学指纹识别模组上,光学指纹识别模组就能够根据该反射后的探测光形成指纹图像,将该指纹图像转换成电信号传输即可进行指纹的比对识别,从而实现了光学指纹的检测。解决了现有光学指纹识别模组在LCD模式下,设置在显示模组背离显示面板的一侧,无法实现屏下指纹检测的问题。
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是本发明实施例一提供的一种屏下光学指纹识别系统的结构示意图;
图2是本发明实施例一提供的另一种屏下光学指纹识别系统的结构示意图;
图3是本发明实施例一提供的一种屏下光学指纹识别系统中指纹检测光源的设置示意图;
图4是本发明实施例一提供的又一种屏下光学指纹识别系统中指纹检测光源的设置示意图;
图5是本发明实施例一提供的又一种屏下光学指纹识别系统中指纹检测光源的设置示意图;
图6本发明实施例一提供的另一种屏下光学指纹识别系统中指纹检测光源的设置示意图;
图7是本发明实施例一提供的一种具有屏下光学指纹识别系统的电子装置;
图8是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电子装置;
图9是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电子装置;
图10是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电 子装置;
图11是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电子装置;
图12是本发明实施例三提供的一种屏下光学指纹识别系统的结构示意图;
图13是本发明实施例三提供的另一中屏下光学指纹识别系统的结构示意图;
图14是本发明实施例四提供的一种屏下光学指纹识别系统的结构示意图;
图15是本发明实施例五提供的一种屏下光学指纹识别系统的结构示意图;
图16是本发明实施例六提供的一种屏下光学指纹识别系统的结构示意图;
图17是本发明实施例六提供的另一种屏下光学指纹识别系统的结构示意图;
图18是本发明实施例六提供的一种屏下光学指纹识别系统中准直孔层的结构示意图;
图19是本发明实施例七提供的一种屏下光学指纹识别系统的结构示意图;
图20是本发明实施例七提供的另一种屏下光学指纹识别系统的结构示意图;
图21是本发明实施例七提供的另一种屏下光学指纹识别系统中微透镜层的结构示意图;
图22是本发明实施例七提供的一种屏下光学指纹识别系统的局部放大结构示意图;
图23是本发明实施例七提供的又一种屏下光学指纹识别系统的局部放大结构示意图;
图24是本发明实施例七提供的另一种屏下光学指纹识别系统的局部放大结构示意图。
附图标记说明:
显示面板-10;玻璃盖板-11;液晶层-12;屏下光学指纹识别系统-20;指纹检测光源-21;光学胶-211;光学指纹识别模组-22;光学元件-221;指纹图像传感器-222;透光孔-223;微透镜层-224;光阑层-225;光阑孔-226;贴合层-227;背光模组-30;增亮膜-31;扩散膜-32;反射膜-33;钢板-34;开孔-341;导光板-35;背光光源-36;滤光层-40;基板-50;电子装置-60。
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发明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。
实施例一
图1是本发明实施例一提供的一种屏下光学指纹识别系统的结构示意图,图2是本发明实施例一提供的另一种屏下光学指纹识别系统的结构示意图,图3是本发明实施例一提供的一种屏下光学指纹识别系统中指纹检测光源的设置示意图,图4是本发明实施例一提供的又一种屏下光学指纹识别系统中指纹检测光源的设置示意图,图5是本发明实施例一提供的又一种屏下光学指纹识别系统中指纹检测光源的设置示意图,图6本发明实施例一提供的另一种屏下光学指纹识别系统中指纹检测光源的设置示意图,图7是本发明实施例一提供的一种具有屏下光学指纹识别系统的电子装置,图8是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电子装置,图9是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电子装置,图10是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电子装置,图11是本发明实施例一提供的又一种具有屏下光学指纹识别系统的电子装置。
本实施例提供一种屏下光学指纹识别系统,应用于具有背光模组30和显 示面板10的电子装置,具体的,背光模组30位于显示面板10的背后,背光模组30用于向显示面板提供可见光,其功能是供应充足的亮度与分布均匀的光源,以使显示面板10的显示模组能够正常的显示影像。
其中,在本实施例中,如图1和图2所示,该屏下光学指纹识别系统包括:光学指纹识别模组22和指纹检测光源21,将光学指纹识别模组22设置于背光模组30背离显示面板10的一侧,即光学指纹识别模组22位于背光模组30的背后。指纹检测光源21用于向显示面板10上的指纹检测区域发射探测光,具体的,指纹检测光源21发射探测光以照射在指纹检测区域的手指上,且该探测光为可透过背光模组的非可见光,该探测光经过检测区域上的手指反射后返回,则反射后的探测光上已带有手指的指纹信息,且反射后的探测光也能够透过背光模组30,反射后的探测光在透过背光模组30后进入光学指纹识别模组22,光学指纹识别模组22接收到反射后的探测光,并根据反射后的探测光形成指纹图像,将该指纹图像转换成电学信号,即可对指纹进行比对识别,即在本实施例中,将光学指纹识别模组22设置在背光模组30背离显示面板10的一侧,通过使指纹检测光源21发出的探测光能够透光背光模组30,这样,指纹检测光源21发射的探测光照射到指纹检测区域的手指上反射,则带有指纹信息的反射后的探测光也能够透过背光模组30,并照射在位于背光模组30后的光学指纹识别模组22上,光学指纹识别模组22就能够根据该反射后的探测光形成指纹图像,将该指纹图像转换成电信号传输即可进行指纹的比对识别,从而实现了光学指纹的检测。
需要说明的是,在本实施例中,探测光为可透过背光模组30的非可见光,具体的指,指纹检测光源21发出的探测光能够透过背光模组30,同时保证不影响背光模组30的发光性能。在现有的指纹检测光源和背光模组中,由于背光模组的功能性约束,指纹检测光往往不能透过背光模组,或者背光模组往往会影响指纹检测光源发出的光的光学性能,在本实施例中,使指纹检测光源21发出的探测光可透过背光模组30的方法,可以是使指纹检测光源21以及背光模组30与现有指纹检测光源和背光模组均有所不同,也可以是使指纹检测光源21和背光模组30的其中之一有所不同。
在本实施例中,需要进行指纹检测时,将手指放置在显示面板10的指纹检测区域上,指纹检测光源21向指纹检测区域发射探测光,该探测光照射到 指纹检测区域上的手指时,被手指反射,反射后的探测光就带有指纹的信息,反射后的探测光可透过背光模组30,进入位于背光模组30后的光学指纹识别模组22,光学指纹识别模组22接收到反射后的探测光,并根据该反射后的探测光携带的指纹信息形成指纹图像,将该指纹图像换成电学信号后即可对该指纹信息进行比对检测,从而实现背后的光学指纹识别。
在本实施例中,指纹检测区域位于显示面板10上,具体的,指纹检测区域可以是在显示面板10上划定的一部分或者多部分区域,也可以是覆盖整个显示面板10的区域。
在本实施例中,指纹检测光源21可以位于背光模组30背离显示面板10的一侧,与光学指纹识别模组22并排设置,或者指纹检测光源21也可以位于显示面板10的玻璃盖板11下方,能够保证指纹检测光源21发出的探测光可照射在显示面板10上的指纹检测区域上,且光学指纹识别模组22能够接收到反射后的探测光即可。
在本实施例中,该显示面板10可包括液晶层12和玻璃盖板11,玻璃盖板11即为电子装置的显示屏幕,该显示面板10可以是现有技术中的显示面板,具体的,还可包括其它部分,具体设置方式可参照现有技术,在本实施例中不再赘述。
进一步的,在本实施例中,使指纹检测光源21发出的探测光为非可见光,这样在进行指纹检测时,指纹检测光源21发出的光照射在指纹检测区域时,探测光对用户是不可见的,与以可见光作为探测光相比,在指纹检测时,检测区域不会产生可见的亮度,可避免在每次检测时产生亮度,降低用户的使用体验。
在本实施例中,指纹检测光源21可以为发光二极管(LED)、垂直腔面发射激光器(VCSEL)以及激光二极管(Laser Diode)等,在本实施例中不做限制。
其中,在本实施例中,指纹检测光源21为红外指纹检测光源,即指纹检测光源21发出的探测光为红外光。指纹检测光源21可以位于显示面板10的玻璃盖板11下方,且指纹检测光源21与显示面板10的液晶层12并排设置;或者,指纹检测光源21也可以位于背光模组30背离显示面板10的一侧。
在本实施例中,该屏下光学指纹识别系统还包括基板50,如图1所示,基 板50位于背光模组30背离显示面板10的一侧,且指纹检测光源21、光学指纹识别模组22设置在基板50朝向背光模组30的一面上。具体的,当指纹检测光源21位于背光模组30背离显示面板10的一侧时,该基板50可位于背光模组30背离显示面板10的一侧,指纹检测光源21、光学指纹识别模组22设置在基板50朝向背光模组30的一面上。基板50用于为指纹检测光源21以及光学指纹识别模组22提供设置场所,该基板50可以是FPC软板或PCB硬板,在本实施例中不做限制。
其中,在本实施例中,指纹检测光源21的出光面与显示面板10的玻璃盖板11可以平行,具体的,如图3和图4所示,指纹检测光源21可以位于背光模组30背离显示面板10的一面上,具体的设置在基板50上,也可以设置在玻璃盖板11之下,指纹检测光源21的出光面与显示面板10的玻璃盖板11平行,即指纹检测光源21与玻璃盖板11、背光模组30等均平行设置,平行的设置方式可便于装配,在结构上的公差也更容易控制。或者,指纹检测光源21的出光面可以与显示面板10的玻璃盖板11之间形成夹角,具体的,如图5所示,在本实施例中,指纹检测光源21位于玻璃盖板11下方,且指纹检测光源21与显示面板10的液晶层12并排设置,指纹检测光源21的出光面与玻璃盖板11之间形成夹角,具体的,指纹检测光源21的出光面朝向玻璃盖板11上的指纹检测区域倾斜一定的角度,这样,可保证出光面发出的光可最大程度的照射到指纹检测区域,提高光线的利用率。在本实施例中,使指纹检测光源21的出光面与显示面板10的玻璃盖板11平行设置或者成夹角设置可根据实际需求进行选择设置。
进一步的,在本实施例中,指纹检测光源21还可以位于背光模组30的导光板35朝向光学指纹识别模组22的一侧,且指纹检测光源21与位于导光板35朝向光学指纹识别模组22一侧设置的背光光源36并排设置。具体的,如图6所示,背光模组30的导光板35朝向光学指纹识别模组22的一侧上设有背光光源36,使指纹检测光源21位于背光模组30朝向光学指纹识别模组22的一侧,且指纹检测光源21与背光光源36并排设置,即可将原有的导光板35一侧的背光光源36中的部分光源替换成指纹检测光源21,这样即可保证背光模组30的性能,同时也可实现指纹的检测。
其中,在本实施例中,指纹检测光源21可以与基板50贴合,也可以与玻 璃盖板11贴合,即指纹检测光源21可以与玻璃盖板11平行贴合在基板50上或者玻璃盖板11上,指纹检测光源21也可以与玻璃盖板11成夹角贴合在基板50上或者玻璃盖板11上。其中,贴合时,在本实施例中,可采用光学胶211进行贴合,该光学胶211的光学折射率与玻璃盖板11相同,这样可降低指纹检测光源21发出的光在玻璃盖板11下表面被反射掉的占比,有效提高光源的利用率,使指纹检测光源21发出的光可以更多的照向手指。
进一步的,在本实施例中,如图7至图11所示,指纹检测光源21可以为一个,或者也可以是多个,当指纹检测光源21为多个时,多个的指纹检测光源21通过以光学指纹识别模组22为对称中心的方式设置,或者,多个的指纹检测光源21通过以光学指纹识别模组22为对角线中心的方式设置,这样就能够保证手指在指纹检测区域上不同角度按压下的指纹检测效果。另外,将指纹检测光源21的数目设置为多个,有助于进一步增加指纹检测的信号量,提高指纹识别的效果。
在本实施例中,如图11所示,指纹检测光源21还可以是直线型,直线型的指纹检测光源21位于所述光学指纹识别模组22的一侧设置,同样可兼顾手指在指纹检测区域不同角度按压下的指纹检测效果。
进一步的,在本实施例中,如图1至图4所示,该屏下光学指纹识别系统还包括滤光层40,滤光层40位于光学指纹识别模组22和背光模组30之间且与光学指纹识别模组22相对应。在进行指纹检测时,从指纹检测光源21发出的探测光照射在显示面板10上的指纹检测区域上,被手指反射后,反射后的探测光透过背光模组30后照射在光学指纹识别模组22上,同时环境中的自然光或者背光模组30中的可见光也可能会照射在光学指纹识别模组22上,这样就会对指纹识别产生干扰,而在本实施例中,在光学指纹识别模组22和背后模组之间设置滤光层40,滤光层40对进入光学指纹识别模组22中的光进行透过与滤除,具体的,该滤光层40用于使反射后的探测光透过,并滤除进入指纹识别模组中的可见光,即在反射后的探测光经过滤光层40进入光学指纹识别模组22时,该滤光层40对反射后的探测光具有很好的透过性,并可以滤除环境中的可见光,这样就在保证实现光学指纹识别的同时,可避免可见光进入光学指纹识别模组22中,影响光学指纹识别模组22的识别,有效的避免了环境中的光对指纹检测的干扰,提高了指纹检测的精 准度。
在本实施例中,该滤光层40可包括滤光片,滤光片的类型可根据指纹检测光源21的具体类型进行选择,如指纹检测光源21为红外指纹检测光源21,其发出的探测光为红外光,则滤光片的类型为可使与红外指纹检测光源21的发光频段对应的部分红外光透过,并滤除可见光以及其他红外光的滤光片,比如外界环境干扰光以及背光模组发出的可见光等。
作为一种具体实施例,红外指纹检测光源可以具体连接到光学指纹识别模组22,并由光学指纹识别模组22控制以发出特定波长的红外光。滤光层40包括红外截止滤光层,且红外指纹检测光源的发光频段至少部分位于红外截止滤光层的截止频段之外。
本实施例提供的一种屏下光学指纹识别系统,通过包括光学指纹识别模组22和指纹检测光源21,该光学指纹识别模组22位于背光模组30背离显示面板10的一侧,指纹检测光源21用于向显示面板10上的指纹检测区域发射探测光,且该探测光为可透过背光模组的非可见光,探测光经检测区域上的手指反射后透过背光模组30并进入光学指纹识别模组22,以使光学指纹识别模组22根据反射后的探测光形成指纹图像。即在本实施例中,将光学指纹识别模组22设置在背光模组30背离显示面板10的一侧,通过使指纹检测光源21发出的探测光能够透光背光模组30,这样,指纹检测光源21发射的探测光照射到指纹检测区域的手指上反射,则带有指纹信息的反射后的探测光也能够透过背光模组30,并照射在位于背光模组30后的光学指纹识别模组22上,光学指纹识别模组22就能够根据该反射后的探测光形成指纹图像,将该指纹图像转换成电信号传输即可进行指纹的比对识别,从而实现了光学指纹的检测。解决了现有光学指纹识别模组在LCD模式下,设置在显示模组背离显示面板的一侧,无法实现屏下指纹检测的问题。
实施例二
进一步的,在实施例一的基础上,在本实施例中,如图1和图2所示,背光模组30包括:可使探测光透过的扩散膜32,扩散膜32用于对背光模组30发出的可见光进行雾化。现有背光模组的扩散膜,其对可见光及红外光等非可见光均有雾度,从而使指纹检测光源发出的光无法透过背光模组成像,而在 本实施例中,探测光能够透过扩散膜32,同时扩散膜32对背光模组30发出的可见光具有雾化的效果,这样,就可避免探测光再透过背光模组30时,扩散膜32对探测光的光学性能的影响,在不影响背光模组30的性能的同时,可保证探测光能够很好的透过扩散膜32,且不影响探测光的性能。
进一步的,在本实施例中,背光模组30还包括:可使探测光透过的反射膜33,反射膜33位于扩散膜32朝向光学指纹识别模组22的一侧,反射膜33用于对可见光进行反射。现有的背光模组包括的反射膜,其对可见光以及非可见光等均具有很好的反射效果,以保证背光模组的性能,而在本实施例中,反射膜33为能够使探测光透过,但对可见光仍具有很好反射效果的反射膜33,这样,手指反射后的探测光再经过扩散膜32后就可以透过反射膜33,同时也不影响反射膜33的性能,在保证背光模组30性能的同时,可使探测光透过,实现指纹的检测。
进一步的,在本实施例中,背光模组30还包括:钢板34,钢板34位于反射膜33朝向光学指纹识别模组22的一侧,且钢板34与光学指纹检测模组相对应的位置处设有可供反射后的探测光透过的开孔341。现有的背光模组所包括的钢板多为不能透光的钢板,从而使指纹检测光源发出的光无法透过背光模组照射到光学指纹检测模组上,而在本实施例中,如图1和图2所示,在钢板34与光学指纹检测模组相对应得位置处开设开孔341,该开孔341能够供反射后得探测光透过,这样,经过手指反射的探测光再依次透过扩散膜32和反射膜33后,经过该开孔341即可照射到光学指纹检测模组上,实现指纹的检测。
其中,在本实施例中,背光模组30还包括:导光板35,该导光板35位于扩散膜32与反射膜33之间,其中该导光板35可以是现有技术中的导光板,具体的设置方式可参见现有技术,在本实施例中不再赘述。
需要说明的是,在现有的背光模组中,在扩散膜朝向显示面板的一侧还具有棱镜膜,棱镜膜对可见光具有打散和分光的效果,而在本实施例中,背光模组30中不设置棱镜膜,这样就能够避免探测光在透过背光模组30时,棱镜膜对探测光的光学性能的影响,保证探测光能够很好的透过扩散膜32,且不影响探测光的性能。
在本实施例中,显示面板10包括玻璃盖板11和液晶层12,光学指纹识别模组22位于背光模组30背离显示面板10的一侧,且光学指纹识别模组22与背 光模组30之间具有滤光层40,如图2所示,指纹检测光源21可以位于玻璃盖板11下方,且与液晶层12并排设置;或者,如图1所示,指纹检测光源21位于背光模组30背离显示面板10的一侧,指纹检测光源21与光学指纹检测模组均设置在基板50上。
本实施例提供的一种屏下光学指纹识别系统,通过使背光模组30包括可使探测光透过的扩散膜32、可使探测光透过的反射膜33以及钢板34,且使钢板34与光学指纹检测模组相对应的位置处设有可供反射后的探测光透过的开孔341,这样,经过手指反射后的探测光,就能够依次透过扩散膜32、反射膜33以及钢板34上的开孔341照射在光学指纹识别模组22上,即透过背光模组30照射在位于背光模组30后的光学指纹识别模组22上,实现指纹的检测。
实施例三
图12是本发明实施例三提供的一种屏下光学指纹识别系统的结构示意图,图13是本发明实施例三提供的另一中屏下光学指纹识别系统的结构示意图。
与实施例二不同的是,在本实施例中,背光模组30还包括:可使探测光透过的增亮膜31,在实施例一中,与现有的背光模组相比,不包括棱镜膜,这样可能会降低背光模组30的亮度,不能满足用户的需求,为进一步提高背光模组30的亮度,如图12和图13所示,在本实施例中,背光模组30还包括可使探测光透过的增亮膜31,增亮膜31位于扩散膜32朝向显示面板10的一侧,增亮膜31用于对可见光起到增强亮度的效果。即本实施例中,探测光能够透过该增亮膜31,同时该增亮膜31对背光模组30发出的可见光具有增强亮度的作用,这样就可避免探测光在透过背光模组30时,增亮膜31对探测光产生打散和分光效果等影响,使透过增亮膜31后探测光形成的指纹图像不存在畸变,在增强背光模组30光学性能的同时,可保证探测光能够很好的透过增亮膜31,实现指纹的检测。
作为一种具体实施例,增亮膜31可采用非棱镜结构的膜层结构来增强背光模组的亮度,避免探测光在透过背光模组30时,增亮膜31对探测光产生打散和分光效果等影响,使透过增亮膜31后探测光形成的指纹图像不存在畸变。
在本实施例中,增亮膜31包括多层光学材料层,光学材料层由低色散系数的光学材料构成,具体的,增亮膜31由多层光学材料层堆叠形成,且该光学材料层是由低色散系数的光学材料构成,低色散系数的化学材料层可保证 不同颜色的光线以相同的角度从增亮膜31中射出。一般来说,光学材料层的色散系数(即阿贝数)与折射率成反比,且色散系数越高越利于LCD的显示效果,但是若采用较高的色散系数可能会增加光学材料层的整体厚度,因此,作为一种优选的实施例,光学材料层的色散系数可以在30~60之间进行折衷考虑,具体可以按照实际产品设计需要而定。在本实施例中,多层光学材料层的折射率从扩散膜32到显示面板10的方向依次增加,即多层光学材料层是以折射率从扩散膜32到显示面板10的方向逐渐增大的趋势堆叠,这样可以将扩散膜32射出的大角度光线最终转化为接近垂直的光线射出,从而增加背光模组30轴向上的亮度,对背光模组30发出的光起到增强亮度的效果。
在本实施例中,显示面板10包括玻璃盖板11和液晶层12,光学指纹识别模组22位于背光模组30背离显示面板10的一侧,且光学指纹识别模组22与背光模组30之间具有滤光层40,如图13所示,指纹检测光源21可以位于玻璃盖板11下方,且与液晶层12并排设置;或者,如图12所示,指纹检测光源21位于背光模组30背离显示面板10的一侧,指纹检测光源21与光学指纹检测模组均设置在基板50上。
本实施例提供的一种屏下光学指纹识别系统,通过使背光模组30还包括可使探测光透过的增亮膜31,增亮膜31位于扩散膜32朝向显示面板10的一侧,增亮膜31用于对可见光起到增强亮度的效果。即本实施例中,探测光能够透过该增亮膜31,同时该增亮膜31对背光模组30发出的可见光具有增强亮度的作用,这样就可避免探测光在透过背光模组30时,增亮膜31对探测光产生打散和分光效果等影响,使透过增亮膜31后探测光形成的指纹图像不存在畸变,在增强背光模组30光学性能的同时,可保证探测光能够很好的透过增亮膜31,实现指纹的检测。
实施例四
图14是本发明实施例四提供的一种屏下光学指纹识别系统的结构示意图。
进一步的,如图14所示,在实施例一的基础上,在本实施例中,光学指纹识别模组22包括光学元件221和指纹图像传感器222,光学元件221位于指纹图像传感器222朝向背光模组30的一侧,反射后的探测光透过背光模组后,再透过光学元件221,且进入指纹图像传感器222以形成指纹图像,即光学元件221设置在背后模组和指纹图像传感器222之间,具体的,光学元件221设置在与指纹图像传感器222相应的位置处,光学元件221可对反射后的、带有指纹 信息的探测光起到调制的作用,使探测光经过调制后进入指纹图像传感器222中,提高指纹识别的精度和检测效果。探测光照射到显示面板10的指纹检测区域的手指上反射,反射后的探测光依次透过背光模组30和光学元件221后进入指纹图像传感器222中以形成指纹图像,指纹图像传感器222将指纹图像转换成电信号,即可用于进行指纹的比对,实现指纹的识别,同时有助于提高指纹检测的精准度,提升指纹识别的效果。
在本实施例中,对光学元件221的具体类型并无其它要求,能够实现其功能即可,该光学元件221可以是透镜、准直孔层以及光阑等。
进一步的,在本实施例中,该屏下光学指纹识别系统还包括滤光层40,滤光层40可以位于光学指纹识别模组22和背光模组30之间,且与光学指纹识别模组22相对应,具体的,滤光层40可以位于光学元件221和背光模组30与之间,滤光层40用于使发射后的探测光透过,并滤除进入指纹识别模组中的可见光,探测光照射到指纹检测区域的手指后反射,反射后的探测光透过背光模组30后,透过滤光层40以及光学元件221进入指纹图像传感器222中,同时滤光层40可滤除环境中的可见光,这样在保证实现光学指纹识别的同时,避免了环境中的可见光透过光学元件221进入指纹图像传感器222中,影响光学指纹识别模组22的识别,提高了指纹检测的精准度。
在本实施例中,该滤光层40也可以位于光学元件221和指纹图像传感器222之间,且滤光层40与指纹图像传感器222相对应,探测光照射到指纹检测区域的手指被反射,反射后的探测光透过背光模组30后,依次透过光学元件221以及滤光层40进入指纹图像传感器222中,同时滤光层40可滤除环境中的可见光,这样在保证实现光学指纹识别的同时,避免了环境中的可见光透过光学元件221进入指纹图像传感器222中,影响光学指纹识别模组22的识别,提高了指纹检测的精准度。
在本实施例中,滤光层40可以采用IC集成的方式集成在光学元件221或指纹图像传感器222上,也可以采用独立设置的方式与光学元件221或指纹图像传感器222贴合。
其中,在本实施例中,该屏下光学指纹识别系统还包括可透光的贴合层,该贴合层用于将滤光层与光学元件贴合,其中,该可透光的贴合层具体为具有低折射率的透光材料,具有良好的透光性和较低的折射率,这样可保证滤 光层和光学元件之间良好的固定的同时,也保证了光学元件的调制效果不受影响。滤光层的类型可参照实施例一,在本实施例中不再赘述。
在本实施例中,指纹检测光源可以是红外指纹检测光源。指纹检测光源的设置位置可以位于显示面板的玻璃盖板下方,且指纹检测光源与显示面板的液晶层并排设置;或者,指纹检测光源也可以位于背光模组背离显示面板的一侧。在设置时,指纹检测光源的出光面与显示面板的玻璃盖板可以平行,或者指纹检测光源的出光面可以与显示面板的玻璃盖板之间形成夹角。指纹检测光源可以是一个或多个,多个的指纹检测光源以光学指纹识别模组为对称中心或对角线中心的方式设置。或者,该指纹检测光源可以是直线型,直线型的指纹检测光源可以位于光学指纹识别模组的一侧设置。具体的指纹检测光源的类型及设置方式可参照实施例一,在本实施例中不再赘述。
在本实施例中,该屏下光学指纹识别系统还可包括基板50,基板50位于背光模组30背离显示面板10的一侧,且指纹检测光源21、光学指纹识别模组22设置在基板50朝向背光模组30的一面上。基板50用于为指纹检测光源21以及光学指纹识别模组22提供设置场所,该基板50可以是FPC软板或PCB硬板,在本实施例中不做限制。
在本实施例中,背光模组可包括:可使探测光透过的扩散膜、可使探测光透过的反射膜以及钢板,且该钢板与光学指纹检测模组相对应的位置处设有可供反射后的探测光透过的开孔;背光模组还可包括:可使探测光透过的增亮膜,具体的设置方式可参见实施例二以及实施例三,在本实施例中不再赘述。需要说明的是,钢板上开设的开孔的区域大小需大于透镜的视场角范围,以保证指纹检测不受遮挡。
本实施例提供的一种屏下光学指纹识别系统,通过光学指纹识别模组22包括光学元件221和指纹图像传感器222,并使光学元件221位于指纹图像传感器222朝向背光模组30的一侧,光学元件221可对反射的、带有指纹信息的探测光起到调制的作用,使其经过调制后进入指纹图像传感器222中,提高指纹识别的精度和检测效果。具体的,探测光照射到显示面板10的指纹检测区域的手指上被反射,反射后的探测光透过背光模组30后,再透过光学元件221进入指纹图像传感器222中以形成指纹图像,实现光学指纹的识别,同时有助于提高指纹检测的精准度,提升指纹识别的效果。
实施例五
图15是本发明实施例五提供的一种屏下光学指纹识别系统的结构示意图。
进一步的,在上述实施例四的基础上,如图14和图15所示,在本实施例中,光学指纹识别模组22的光学元件221包括透镜,改透镜可以包括至少一个非球面透镜,且其中一个非球面透镜凸起的一端朝向指纹图像传感器222设置,透镜具有较强的聚光能力,返回光经过透镜后成像,使可成像的广度范围较大,形成的指纹图像更加准确具体的。即在本实施例中,透镜可以用于将返回光汇聚到指纹图像传感器,以增大光学指纹识别模组的视场角,透镜设置在背光模组30和指纹图像传感器222之间,且透镜位于与指纹图像传感器222相应的位置处,探测光照射到显示面板10的指纹检测区域的手指上被反射,反射后的探测光透过背光模组30后,再透过透镜进入指纹图像传感器222中以形成指纹图像,指纹图像传感器222将指纹图像转换成电信号,即可用于进行指纹的比对,实现光学指纹的识别,同时经过透镜的调制后成像,具有较广的成像范围,且形成更加准确的指纹图像,有助于提高指纹检测的精准度。
进一步的,在本实施例中,如图14和图15所示,该屏下光学指纹识别系统还包括滤光层40,滤光层40可以位于透镜和指纹图像传感器222之间,也可以位于透镜和背后模组之间,且滤光层40与指纹图像传感器222相对应,筋手指反射后的探测光透过背光模组30后,依次透过透镜和滤光层40后进入指纹图像传感器222中,同时滤光层40可滤除环境中的可见光,这样在保证实现光学指纹识别的同时,避免了环境中的可见光透过光学元件221进入指纹图像传感器222中,影响光学指纹识别模组22的识别,提高了指纹检测的精准度。
在本实施例中,滤光层40可以采用IC集成的方式集成在指纹图像传感器222或透镜上,也可以采用独立设置的方式与指纹图像传感器222或透镜贴合。其中,滤光层40与透镜进行贴合时,可通过可透光、低折射率的贴合层对两者进行贴合,这样保证滤光层和透镜之间良好的固定的同时,可以保证透镜的聚光效果不受影响。滤光层的类型可参照实施例一,在本实施例中不再赘述。
在本实施例中,指纹检测光源可以是红外指纹检测光源。指纹检测光源的设置位置可以位于显示面板的玻璃盖板下方,且指纹检测光源与显示面板的液晶层并排设置;或者,指纹检测光源也可以位于背光模组背离显示面板的一侧。在设置时,指纹检测光源的出光面与显示面板的玻璃盖板可以平行,或者指纹检测光源的出光面可以与显示面板的玻璃盖板之间形成夹角。指纹检测光源可以是一个或多个,多个的指纹检测光源以光学指纹识别模组为对称中心或对角线中心的方式设置。或者,该指纹检测光源可以是直线型,直线型的指纹检测光源可以位于光学指纹识别模组的一侧设置。具体的指纹检测光源的类型及设置方式可参照实施例一,在本实施例中不再赘述。
在本实施例中,该屏下光学指纹识别系统还可包括基板,基板位于背光模组背离显示面板的一侧,且指纹检测光源、光学指纹识别模组设置在基板朝向背光模组的一面上。基板用于为指纹检测光源以及光学指纹识别模组提供设置场所,该基板可以是FPC软板或PCB硬板,在本实施例中不做限制。
在本实施例中,背光模组可包括:可使探测光透过的扩散膜、可使探测光透过的反射膜以及钢板,且该钢板与光学指纹检测模组相对应的位置处设有可供反射后的探测光透过的开孔;背光模组还可包括:可使探测光透过的增亮膜,具体的设置方式可参见实施例二以及实施例三,在本实施例中不再赘述。
本实施例提供的一种屏下光学指纹识别系统,通过使光学元件221包括至少一个非球面透镜,该透镜用于将探测光汇聚到指纹图像传感器上,增大光学指纹识别模组的视场角。利用透镜强的聚光能力,使成像的广度范围变大,形成的指纹图像更加准确,具体的,具体的,经过手指反射后的探测光透过背光模组30后,再透过透镜进入指纹图像传感器222中以形成指纹图像,实现光学指纹的识别,同时经过透镜的调制后成像,具有较广的成像范围,且形成更加准确的指纹图像,有助于提高指纹检测的精准度。
实施例六
图16是本发明实施例六提供的一种屏下光学指纹识别系统的结构示意图,图17是本发明实施例六提供的另一种屏下光学指纹识别系统的结构示意图,图18是本发明实施例六提供的一种屏下光学指纹识别系统中准直孔层的结构 示意图。
进一步的,在实施例四的基础上,如图16和图17所示,在本实施例中,光学元件221包括准直孔层,准直孔层上开设多个相互平行的透光孔223,以使反射后的探测光透过背光模组后经过透光孔223投射在指纹图像传感器222上,光线经过准直孔层上的透光孔223时,可选择使一种特定角度的光线透过,使其余光线无法参与成像,避免了交杂的光线对指纹成像形成干扰,有效的提高了指纹图像的清晰度,提升指纹识别的精准度。具体的,准直孔层设置在背光模组30和指纹图像传感器222之间,且准直孔层位于与指纹图像传感器222相应的位置处,经手指反射后的探测光透过背光模组30后,再经过准直孔层上的透光孔223进入指纹图像传感器222中以形成指纹图像,实现了光学指纹的识别,同时经过准直孔的透过选择,有效的提高了指纹图像的清晰度,提升指纹识别的精准度。
其中,在本实施例中,如图18所示,准直孔层由不透光的光阻材料形成,在其上开设用于透光的透光孔223,即可实现对光线的选择透过。其中,透光孔223的孔径大小和深度可根据需求的准直孔层的准直度进行设置,在本实施例中,透光孔223的孔径和孔深的比值大于5,可保证形成的图像性较好的指纹图像,保证光学指纹识别的实现。
进一步的,在本实施例中,如图16和图17所示,该屏下光学指纹识别系统还包括滤光层40,滤光层40可以位于准直孔层和指纹图像传感器222之间,也可以位于准直孔层和背光模组30之间,且滤光层40与指纹图像传感器222位置相对应,经手指反射后的探测光透过背光模组30后,再透过准直孔层的透光孔223和滤光层40进入指纹图像传感器222中,同时滤光层40可滤除环境中的可见光,这样在保证实现光学指纹识别的同时,避免了环境中的可见光透过透光孔223后进入指纹图像传感器222中,影响光学指纹识别模组22的识别,提高了指纹检测的精准度。
在本实施例中,滤光层40可以采用IC集成的方式集成在指纹图像传感器222或准直孔层上,也可以采用独立设置的方式与指纹图像传感器222或准直孔层贴合。其中,滤光层40的类型可参照实施例一,在本实施例中不再赘述。
在本实施例中,指纹检测光源可以是红外指纹检测光源。指纹检测光源的设置位置可以位于显示面板的玻璃盖板下方,且指纹检测光源与显示面板 的液晶层并排设置;或者,指纹检测光源也可以位于背光模组背离显示面板的一侧。在设置时,指纹检测光源的出光面与显示面板的玻璃盖板可以平行,或者指纹检测光源的出光面可以与显示面板的玻璃盖板之间形成夹角。指纹检测光源可以是一个或多个,多个的指纹检测光源以光学指纹识别模组为对称中心或对角线中心的方式设置。或者,该指纹检测光源可以是直线型,直线型的指纹检测光源可以位于光学指纹识别模组的一侧设置。具体的指纹检测光源的类型及设置方式可参照实施例一,在本实施例中不再赘述。
在本实施例中,该屏下光学指纹识别系统还可包括基板,基板位于背光模组背离显示面板的一侧,且指纹检测光源、光学指纹识别模组设置在基板朝向背光模组的一面上。基板用于为指纹检测光源以及光学指纹识别模组提供设置场所,该基板可以是FPC软板或PCB硬板,在本实施例中不做限制。
在本实施例中,背光模组可包括:可使探测光透过的扩散膜、可使探测光透过的反射膜以及钢板,且该钢板与光学指纹检测模组相对应的位置处设有可供反射后的探测光透过的开孔;背光模组还可包括:可使探测光透过的增亮膜,具体的设置方式可参见实施例二以及实施例三,在本实施例中不再赘述。
本实施例提供的一种屏下光学指纹识别系统,通过使光学元件221包括准直孔层,在准直孔层上开设多个透光孔223,这样光线经过准直孔层时,透光孔223可选择性的使平行与透光孔223轴向的光学透过,避免了交杂的光线对指纹成像形成干扰,有效的提高了指纹图像的清晰度,提升指纹识别的精准度,这样反射后的探测光透过背光模组30后,透过准直孔层上的透光孔223进入指纹图像传感器222中以形成指纹图像,实现了光学指纹的识别,同时经过准直孔的透过选择,有效的提高了指纹图像的清晰度,提升指纹识别的精准度。
实施例七
图19是本发明实施例七提供的一种屏下光学指纹识别系统的结构示意图,图20是本发明实施例七提供的另一种屏下光学指纹识别系统的结构示意图,图21是本发明实施例七提供的另一种屏下光学指纹识别系统中微透镜层的结构示意图,图22是本发明实施例七提供的一种屏下光学指纹识别系统的局部 放大结构示意图,图23是本发明实施例七提供的又一种屏下光学指纹识别系统的局部放大结构示意图,图24是本发明实施例七提供的另一种屏下光学指纹识别系统的局部放大结构示意图。
进一步的,在上述实施例四的基础上,如图19至图20所示,在本实施例中,光学元件221包括:微透镜层224和光阑层225,具体的,微透镜层224与光阑层225之间设置有透光材料层,其中,微透镜层224位于光阑层225朝向背光模组30一侧设置,且微透镜层224凸起的一端朝向背光模组30,其中微透镜层224具有较强的聚光性,可扩大成像的广度范围,使指纹图像更加的准确。光阑层225包括光阑板,如图21和图22所示,光阑板上开设有多个相互平行的光阑孔226,以使反射后的探测光透过背光模组30后,再依次经过微透镜层224、透光材料层以及光阑孔226照射在指纹图像传感器222上,这样在光学透过光阑板上的光阑孔226时,透光的光阑孔226对光线起到选择透过的作用,提高指纹图像的清晰度,在本实施例中,使光学元件221包括微透镜层224和光阑层225,并使反射后的探测光透过背光模组30后,首先经过微透镜层224,再经过光阑层225的光阑孔226选择透过后进入指纹图像传感器222中,即依次经过透镜和光阑层225后成像,扩大成像广度范围的同时,提高了指纹图像的清晰度,进一步的提升了光学指纹识别的精准度。另外,与光学元件221为透镜或准直孔层相比,使光学元件221包括微透镜层224和光阑层225,由于光阑层225的厚度较小,微透镜层224所需的成像距离较小,使形成的光学元件221更加的薄,从而使整个光学指纹识别系统厚度更薄,有助于满足电子装置日益趋薄化的需求,且经过微透镜和光阑层225后成像,具有更高的准直度,指纹图像也更加的清晰。
在本实施例中,探测光照射到显示面板10指纹检测区域的手指上被反射,反射后的探测光透过背光模组30后,首先透过微透镜层224以及透光材料,然后从光阑层225的光阑孔226透过后进入指纹图像传感器222中以形成指纹图像,实现了光学指纹的识别,且依次经过微透镜层224和光阑层225的调制后成像,扩大成像广度范围的同时,提高了指纹图像的清晰度,有效的提升了指纹识别的精准度。
需要说明的是,在本实施例中,微透镜层224是由多个微透镜并列排布形成的。对透光材料的材料类型并无其它要求,具有透光性不影响光线的传 输即可。
在本实施例中,为提高光阑层225的准直度,进一步提升指纹图像的清晰度,如图23所示,光阑层225可包括多层层叠设置的光阑板,使光线在进行多次的选择透过后进入指纹图像传感器222中,有效的提高形成的指纹图像的清晰度。
进一步的,在本实施例中,如图19和图20所示,该屏下光学指纹识别系统还包括滤光层40,滤光层40可以位于光阑层225和指纹图像传感器222之间,也可以位微透镜层224和背光模组30之间,且滤光层40与指纹图像传感器222位置相对应,经手指反射后的探测光透过背光模组30后,依次透过微透镜、光阑层225的光阑孔226和滤光层40进入指纹图像传感器222中,同时滤光层40可滤除环境中的可见光,这样在保证实现光学指纹识别的同时,避免了环境中的可见光进入指纹图像传感器222中,影响光学指纹识别模组22的识别,提高了指纹检测的精准度。
在本实施例中,滤光层40可以采用IC集成的方式集成在指纹图像传感器222或微透镜层224上,也可以采用独立设置的方式与指纹图像传感器222或微透镜层224贴合。其中,滤光层40与微透镜层224进行贴合时,如图24所示,可通过可透光的、低折射率的贴合层227对两者进行贴合,这样保证滤光层40和微透镜层224之间良好固定的同时,也保证了微透镜的聚光效果不受影响。滤光层40的类型可参照实施例一,在本实施例中不再赘述。
在本实施例中,指纹检测光源可以是红外指纹检测光源。指纹检测光源的设置位置可以位于显示面板的玻璃盖板下方,且指纹检测光源与显示面板的液晶层并排设置;或者,指纹检测光源也可以位于背光模组背离显示面板的一侧。在设置时,指纹检测光源的出光面与显示面板的玻璃盖板可以平行,或者指纹检测光源的出光面可以与显示面板的玻璃盖板之间形成夹角。指纹检测光源可以是一个或多个,多个的指纹检测光源以光学指纹识别模组为对称中心或对角线中心的方式设置。或者,该指纹检测光源可以是直线型,直线型的指纹检测光源可以位于光学指纹识别模组的一侧设置。具体的指纹检测光源的类型及设置方式可参照实施例一,在本实施例中不再赘述。
在本实施例中,该屏下光学指纹识别系统还可包括基板,基板位于背光模组背离显示面板的一侧,且指纹检测光源、光学指纹识别模组设置在基板 朝向背光模组的一面上。基板用于为指纹检测光源以及光学指纹识别模组提供设置场所,该基板可以是FPC软板或PCB硬板,在本实施例中不做限制。
在本实施例中,背光模组可包括:可使探测光透过的扩散膜、可使探测光透过的反射膜以及钢板,且该钢板与光学指纹检测模组相对应的位置处设有可供反射后的探测光透过的开孔;背光模组还可包括:可使探测光透过的增亮膜,具体的设置方式可参见实施例二以及实施例三,在本实施例中不再赘述。
本实施例提供的一种屏下光学指纹识别系统,通过使光学元件221包括微透镜层224和光阑层225,微透镜层224与光阑层225之间设置有透光材料层,并使微透镜层224位于光阑层225朝向背光模组30一侧,且微透镜层224凸起的一端朝向背光模组30;使光阑层225包括光阑板,光阑板上开设有多个相互平行的光阑孔226,以使反射后的探测光透过背光模组30后,再依次经过微透镜层224和透光材料层后经过光阑孔226照射在指纹图像传感器222上,即使依次经过透镜和光阑层225后成像,扩大成像广度范围的同时,提高了指纹图像的清晰度,进一步的提升了光学指纹识别的精准度。
实施例八
本实施例提供一种电子装置,该电子装置包括上述任一实施例中的屏下光学指纹识别系统,该电子装置具体可以为液晶显示装置、电子纸、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。
在本发明的描述中,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发明中的具体含义。
在本发明的描述中,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发明和简化描述,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发明的限制。在本发明的描述中,“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发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,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发明各实施例技术方案的范围。

Claims (25)

  1. 一种屏下光学指纹识别系统,应用于具有背光模组和显示面板的电子装置,其中所述背光模组用于向所述显示面板提供可见光以使所述显示面板显示画面,其特征在于,所述屏下光学指纹识别系统包括:光学指纹识别模组和指纹检测光源;
    其中,所述光学指纹识别模组位于所述背光模组背离所述显示面板的一侧,所述指纹检测光源用于向所述显示面板上的指纹检测区域发射探测光,所述探测光为可透过所述背光模组的非可见光,且所述探测光经所述检测区域上的手指反射后透过所述背光模组并进入所述光学指纹识别模组,以使所述光学指纹识别模组根据反射后的所述探测光形成指纹图像。
  2. 根据权利要求1所述的屏下光学指纹识别系统,其特征在于,所述背光模组包括:可使所述探测光透过的扩散膜,所述扩散膜用于对所述背光模组发出的可见光进行雾化。
  3. 根据权利要求2所述的屏下光学指纹识别系统,其特征在于,所述背光模组还包括:可使所述探测光透过的反射膜,所述反射膜位于所述扩散膜朝向所述光学指纹识别模组的一侧,所述反射膜用于对所述可见光进行反射。
  4. 根据权利要求3所述的屏下光学指纹识别系统,其特征在于,所述背光模组还包括:钢板,所述钢板位于所述反射膜朝向所述光学指纹识别模组的一侧,且所述钢板与所述光学指纹检测模组相对应的位置处设有可供反射后的所述探测光透过的开孔。
  5. 根据权利要求1至4中任一项所述的屏下光学指纹识别系统,其特征在于,所述背光模组还包括:可使所述探测光透过的增亮膜,所述增亮膜位于所述背光模组的扩散膜朝向所述显示面板的一侧,所述增亮膜用于对所述可见光起到增强亮度的效果。
  6. 根据权利要求5所述的屏下光学指纹识别系统,其特征在于,所述增亮膜采用非棱镜结构的膜层结构来增强所述背光模组的亮度。
  7. 根据权利要求5所述的屏下光学指纹识别系统,其特征在于,所述增亮膜包括多层光学材料层,所述光学材料层由低色散系数的光学材料构成。
  8. 根据权利要求7所述的屏下光学指纹识别系统,其特征在于,所述光学材料层的色散系数在30-60之间。
  9. 根据权利要求7所述的屏下光学指纹识别系统,其特征在于,所述多层光学材料层的折射率从所述扩散膜到所述显示面板的方向依次增加。
  10. 根据权利要求7所述的屏下光学指纹识别系统,其特征在于,所述背光模组还包括:导光板,所述导光板位于所述背光模组的扩散膜与所述背光模组的反射膜之间。
  11. 根据权利要求1所述的屏下光学指纹识别系统,其特征在于,所述指纹检测光源位于所述显示面板的玻璃盖板下方,且所述指纹检测光源与所述显示面板的液晶层并排设置;或者,
    所述指纹检测光源位于所述背光模组背离所述显示面板的一侧。
  12. 根据权利要求1所述的屏下光学指纹识别系统,其特征在于,所述背光模组的导光板朝向所述光学指纹识别模组的一侧上设有背光光源,所述指纹检测光源位于所述导光板朝向所述光学指纹识别模组的一侧,且所述指纹检测光源与位于所述导光板朝向所述光学指纹识别模组一侧设置的背光光源并排设置。
  13. 根据权利要求11所述的屏下光学指纹识别系统,其特征在于,还包括基板,所述基板位于所述背光模组背离所述显示面板的一侧,且所述指纹检测光源、所述光学指纹识别模组设置在所述基板朝向所述背光模组的一面上。
  14. 根据权利要求11所述的屏下光学指纹识别系统,其特征在于,所述指纹检测光源的出光面与所述显示面板的玻璃盖板平行,或者所述指纹检测光源的出光面与所述显示面板的玻璃盖板之间形成夹角。
  15. 根据权利要求1所述的屏下光学指纹识别系统,其特征在于,所述光学指纹识别模组包括光学元件和指纹图像传感器,所述光学元件位于所述指纹图像传感器朝向所述背光模组的一侧,且所述光学元件设置在与所述指纹图像传感器相应位置处,反射后的所述探测光透过所述背光模组后透过所述光学元件且进入所述指纹图像传感器以形成指纹图像。
  16. 根据权利要求15所述的屏下光学指纹识别系统,其特征在于,所述光学元件包括至少一个非球面透镜,所述透镜用于将所述探测光汇聚到所述指纹图像传感器,以增大所述光学指纹识别模组的视场角。
  17. 根据权利要求15所述的屏下光学指纹识别系统,其特征在于,所述 光学元件包括准直孔层,所述准直孔层上开设多个相互平行的透光孔,以使反射后的所述探测光透过所述背光模组后经过所述透光孔投射在指纹图像传感器上。
  18. 根据权利要求15所述的屏下光学指纹识别系统,其特征在于,所述光学元件包括:微透镜层和光阑层,所述微透镜层与所述光阑层之间设置有透光材料层,所述微透镜层位于所述光阑层朝向所述背光模组的一侧,且所述微透镜层凸起的一端朝向所述背光模组;
    所述光阑层包括光阑板,所述光阑板上开设有多个相互平行的光阑孔,以使反射后的所述探测光透过所述背光模组后依次经过所述微透镜层、所述透光材料层以及所述光阑孔照射在所述指纹图像传感器上。
  19. 根据权利要求18所述的屏下光学指纹识别系统,其特征在于,所述光阑层包括多层层叠设置的光阑板。
  20. 根据权利要求1所述的屏下光学指纹识别系统,其特征在于,所述指纹检测光源为红外指纹检测光源,且所述红外指纹检测光源连接到所述光学指纹识别模组并由所述光学指纹识别模组控制以发出特定波长的红外光。
  21. 根据权利要求20所述的屏下光学指纹识别系统,其特征在于,还包括滤光层,所述滤光层位于所述光学指纹识别模组和所述背光模组之间且与所述光学指纹识别模组相对应;或者,所述滤光层位于所述光学指纹识别模组的光学元件和指纹图像传感器之间且与所述指纹图像传感器相对应。
  22. 根据权利要求21所述的屏下光学指纹识别系统,其特征在于,所述滤光层包括红外截止滤光层,且所述红外指纹检测光源的发光频段至少部分位于所述红外截止滤光层的截止频段之外。
  23. 根据权利要求22所述的屏下光学指纹识别系统,其特征在于,还包括可透光的贴合层,所述贴合层用于将所述滤光层与所述光学元件贴合。
  24. 根据权利要求20所述的屏下光学指纹识别系统,其特征在于,所述指纹检测光源为一个或多个,多个所述指纹检测光源以所述光学指纹识别模组为对称中心或对角线中心的方式设置;或者,
    所述指纹检测光源为直线型,所述指纹检测光源位于所述光学指纹识别模组的一侧。
  25. 一种电子装置,其特征在于,包括上述权利要求1-24任一所述的屏 下光学指纹识别系统。
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