WO2021097712A1 - Appareil et système de reconnaissance optique d'empreintes digitales sous-écran, film réfléchissant et écran d'affichage à cristaux liquides - Google Patents

Appareil et système de reconnaissance optique d'empreintes digitales sous-écran, film réfléchissant et écran d'affichage à cristaux liquides Download PDF

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Publication number
WO2021097712A1
WO2021097712A1 PCT/CN2019/119721 CN2019119721W WO2021097712A1 WO 2021097712 A1 WO2021097712 A1 WO 2021097712A1 CN 2019119721 W CN2019119721 W CN 2019119721W WO 2021097712 A1 WO2021097712 A1 WO 2021097712A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
reflective film
crystal display
guide plate
optical fingerprint
Prior art date
Application number
PCT/CN2019/119721
Other languages
English (en)
Chinese (zh)
Inventor
曾红林
李家成
青小刚
李顺展
Original Assignee
深圳市汇顶科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市汇顶科技股份有限公司 filed Critical 深圳市汇顶科技股份有限公司
Priority to PCT/CN2019/119721 priority Critical patent/WO2021097712A1/fr
Priority to CN201980004397.2A priority patent/CN111095290B/zh
Publication of WO2021097712A1 publication Critical patent/WO2021097712A1/fr

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels

Definitions

  • This application relates to the field of biometric identification technology, and in particular to an under-screen optical fingerprint identification device and system, reflective film and liquid crystal display screen.
  • under-screen fingerprints also known as light-sensitive screen fingerprint recognition
  • optical under-screen fingerprints are the most popular.
  • Liquid crystal display includes a panel and a backlight module.
  • the backlight module has a light guide plate and a reflective film.
  • the infrared light transmitter can send out an infrared light signal, which can pass through the panel and be reflected/scattered or transmitted by the finger to form an infrared light signal carrying fingerprint information (ie fingerprint detection light), infrared light signal Pass through the panel, light guide plate and reflective film to the sensor, so that the sensor collects fingerprint signals and performs fingerprint recognition.
  • fingerprint information ie fingerprint detection light
  • the light guide plate and the reflective film are easily squeezed and deformed, resulting in uneven contact between the light guide plate and the reflective film, and it is easy to produce Newton rings or interference lines that interfere with fingerprint imaging, thereby affecting fingerprint recognition.
  • the present application provides an under-screen optical fingerprint identification device and system, a reflective film and a liquid crystal display, which solves the problem of uneven contact between the light guide plate and the reflective film in the prior art, and it is easy to produce Newton rings or interference lines that interfere with fingerprint imaging, thereby Issues affecting fingerprint recognition.
  • the embodiment of the application provides an under-screen optical fingerprint identification device, which is suitable for a liquid crystal display with a backlight module, the fingerprint identification area of the under-screen optical fingerprint identification device is located in the display area of the liquid crystal display, and the under-screen optical fingerprint identification device includes Fingerprint recognition module, which includes optical fingerprint sensor and optical path guide structure;
  • the optical fingerprint sensor includes an optical sensing array with multiple sensing units.
  • the optical sensing array is used to receive the infrared fingerprint detection light formed by the finger above the liquid crystal display and passing through the liquid crystal display, and detect the finger’s movement based on the infrared fingerprint detection light. Fingerprint information;
  • the light path guiding structure is arranged under the backlight module of the liquid crystal display to guide the infrared fingerprint detection light to the optical fingerprint sensor;
  • the reflective film faces the interval of the support layer on the surface of the light guide plate to reduce the formation of infrared fingerprint detection light between the light guide plate and the reflective film. Interference lines.
  • an infrared light source is further included.
  • the infrared light source is used to emit infrared light to the fingerprint recognition area of the liquid crystal display device to form infrared fingerprint detection light on the finger above the fingerprint recognition area of the liquid crystal display device.
  • This application provides a liquid crystal display optical fingerprint identification system, which includes a liquid crystal display and the above-mentioned under-screen optical fingerprint identification device.
  • the under-screen optical fingerprint identification device is arranged under the liquid crystal display, and the under-screen optical fingerprint identification device is used for detection Fingerprint information of the finger on the top of the LCD screen;
  • the liquid crystal display includes a liquid crystal panel and a backlight module, and the backlight module is arranged under the liquid crystal panel;
  • the backlight module is used to provide a backlight source for the liquid crystal panel, and transmit the infrared fingerprint detection light formed by the finger above the liquid crystal display to the under-screen optical fingerprint identification device under the backlight module;
  • the backlight module includes a laminated light guide plate and a reflective film, the reflective film faces the under-screen optical fingerprint recognition device, the light guide plate faces the liquid crystal panel, and the surface of the reflective film facing the light guide plate has a support layer, and the support layer is used to separate the light guide plate and the reflective film .
  • the supporting layer includes a plurality of first supporting parts arranged at intervals.
  • the surface of the first support portion facing the light guide plate is a curved surface.
  • the distance between the side of the first supporting portion facing the light guide plate and the side of the first supporting portion facing the reflective film ranges from 1 um to 3 um.
  • the light guide plate has a plurality of irregularly distributed second supporting parts, and the second supporting parts are located on the surface of the light guide plate facing the reflective film.
  • the distance between the two opposite sides of the first support portion is greater than or equal to the maximum distance between the second support portions.
  • the distance between two adjacent first support portions is less than or equal to the minimum distance between each second support portion.
  • the distance between the two opposite sides of the first support portion ranges from 130 um to 250 um.
  • the distance between the centers of two adjacent first support parts ranges from 180 um to 300 um.
  • the plurality of first supporting portions are regularly arranged.
  • the present application further includes a reinforcing plate, which is located on the surface of the reflective film facing the fingerprint identification module, and the reinforcing plate has light-transmitting holes.
  • each first support portion on the reinforcing plate covers the light-transmitting hole.
  • the backlight module further includes a homogenizing film, which covers the side of the light guide plate facing away from the reflective film.
  • the backlight module further includes a brightness enhancement film, and the brightness enhancement film covers the side of the light homogenizing film facing away from the light guide plate.
  • This application provides a reflective film suitable for liquid crystal display screens supporting under-screen fingerprint recognition.
  • the reflective film includes a light-permeable substrate layer and a support layer provided on one side of the substrate layer.
  • the support layer is used to cover the reflective film at intervals.
  • the upper light guide plate reduces the interference lines formed by the infrared fingerprint detection light between the light guide plate and the reflective film, so that the infrared fingerprint detection light formed by the finger above the LCD screen is transmitted to the under-screen optics under the LCD screen through the reflective film Fingerprint identification device.
  • the supporting layer includes a plurality of first supporting parts arranged at intervals.
  • the distance between the side of the first supporting portion facing the light guide plate and the side of the first supporting portion facing the reflective film ranges from 1 um to 3 um.
  • the distance between the two opposite sides of the first support portion ranges from 130 um to 250 um.
  • the distance between the centers of two adjacent first support parts ranges from 180 um to 300 um.
  • the plurality of first supporting portions are regularly arranged.
  • the present application also provides a liquid crystal display that supports under-screen fingerprint recognition, including a liquid crystal panel and a backlight module, the backlight module being arranged under the liquid crystal panel;
  • the backlight module is used to provide a backlight source for the liquid crystal panel, and transmits the infrared fingerprint detection light formed by the finger above the liquid crystal display to the under-screen optical fingerprint identification device below the backlight module; wherein the backlight module includes the above-mentioned reflection membrane.
  • the under-screen optical fingerprint recognition device and system, reflective film and liquid crystal display provided by the embodiments of the application.
  • the infrared fingerprint detection light passes through reflection when it is transmitted to the light guide plate and reflective film of the backlight module.
  • the spacing function of the supporting layer on the surface of the film facing the light guide plate reduces the interference lines formed by the infrared fingerprint detection light between the light guide plate and the reflective film. That is, in the embodiment of the present application, a support layer is provided on the reflective film of the backlight module, wherein the support layer is located on the surface of the reflective film facing the light guide plate.
  • the support layer increases the gap between the light guide plate and the reflective film, reduces the degree of adsorption between the light guide plate and the reflective film, and reduces the width and spacing of the interference pattern. At this time, the width of the interference pattern becomes thinner, and the spacing of the interference pattern is reduced by Sparse and densify, thereby destroying the conditions for forming interference lines.
  • the problem of uneven contact between the light guide plate and the reflective film in the prior art is solved, and Newton's rings or interference lines that interfere with fingerprint imaging are easily generated, thereby affecting fingerprint recognition.
  • the support layer because the support layer is provided on the reflective film, the support layer increases the roughness of the reflective film surface, thereby increasing the haze of the reflective film, thereby shielding the interference lines, which is beneficial to reduce the contrast of the interference lines.
  • FIG. 1 is a schematic structural diagram of an under-screen optical fingerprint identification device provided by an embodiment of the application
  • Fig. 2 is a schematic diagram showing the transmission of the existing infrared light on the light guide plate and the reflective film;
  • FIG. 3 is a schematic diagram showing the structure of interference lines generated by the existing infrared light passing through the light guide plate and the reflective film;
  • FIG. 4 is a schematic structural diagram of an under-screen optical fingerprint identification device provided by an embodiment of the application.
  • FIG. 5 is a schematic structural diagram of a backlight module in an under-screen optical fingerprint identification device provided by an embodiment of the application;
  • FIG. 6 is a schematic diagram of a partial structure of a light guide plate, a reflective film, and a reinforcing plate in the backlight module in the under-screen optical fingerprint identification device provided by an embodiment of the application;
  • FIG. 7 is a schematic diagram of the inter-embedded structure of the first support portion and the second support portion in the backlight module of the under-screen optical fingerprint identification device provided by an embodiment of the application;
  • FIG. 8 is a diagram of the first arrangement of the first supporting portion in the backlight module of the under-screen optical fingerprint identification device provided by the embodiment of the application;
  • FIG. 9 is a diagram of a second arrangement of the first support portion in the backlight module of the under-screen optical fingerprint identification device provided by an embodiment of the application.
  • FIG. 10 is a schematic diagram of the structure of a reflective film provided by an embodiment of the application.
  • 100-under-screen optical fingerprint recognition device 101-fingerprint recognition module; 1011-optical fingerprint sensor; 1012-optical path guide structure; 102-infrared light source; 1021-infrared fingerprint detection light; 200-liquid crystal display; 201-liquid crystal panel 202-backlight module; 2021-light guide plate; 20211-second supporting part; 2022-reflective film; 20221-supporting layer; 20222-first supporting part; 20223-substrate layer; 2023-reinforcing plate; 20231-transparent Light hole; 2024-Gloss film; 2025-Brightness enhancement film; 2026-Circuit board; 203-Transparent protective cover; 300-finger; 400-Newton's ring.
  • FIG. 1 is a schematic structural diagram of an under-screen optical fingerprint identification device suitable for a liquid crystal display provided by an embodiment of the application. 1 and 10, an embodiment of the present application provides an under-screen optical fingerprint identification device.
  • the under-screen optical fingerprint identification device 100 can be applied to smart phones, tablet computers, and other mobile terminals or electronic devices that use liquid crystal displays. equipment.
  • the under-screen optical fingerprint identification device 100 can be arranged in a partial area under the liquid crystal display 200, and cooperate with the liquid crystal display 200 to form a liquid crystal display optical fingerprint identification system.
  • the fingerprint recognition area (or fingerprint detection area) of the under-screen optical fingerprint recognition device 100 may be located in at least a part of the display area of the liquid crystal display 200.
  • the above-mentioned under-screen optical fingerprint recognition device 100 is suitable for a liquid crystal display 200 with a backlight module 202.
  • the liquid crystal display 200 includes a liquid crystal panel 201 and a backlight module 202 disposed under the liquid crystal panel 201, and the backlight module 202 is used to provide a backlight source for the liquid crystal panel 201.
  • the backlight source is specifically a uniform surface light source using visible light, so that the liquid crystal panel 201 displays images for the user to watch.
  • the under-screen optical fingerprint identification device 100 is arranged under the liquid crystal display 200, which may specifically refer to that the main functional components of the under-screen optical fingerprint identification device are arranged under the liquid crystal panel 201 or the backlight module 202; in this embodiment, such as As shown in FIG. 6, the main functional components of the under-screen optical fingerprint recognition device 100 (for example, the fingerprint recognition module 101) are arranged under the backlight module 202.
  • the under-screen optical fingerprint recognition device 100 includes a fingerprint recognition module 101, and the fingerprint recognition module 101 includes an optical fingerprint sensor 1011 and an optical path guiding structure 1012.
  • the optical path guiding structure 1012 is used to guide infrared fingerprint detection light to the optical fingerprint sensor 1011.
  • the optical fingerprint sensor 1011 includes an optical sensing array with a plurality of sensing units, and a reading circuit and other auxiliary circuits electrically connected to the optical sensing array.
  • the sensing area of the optical sensing array may correspond to the fingerprint recognition area of the optical fingerprint sensor 1011.
  • the optical fingerprint sensor 1011 may be located below the fingerprint recognition area of the liquid crystal display 200, or may be located in other areas (such as the edge area of the liquid crystal display 200); and the fingerprint recognition module 101 may use the optical path guiding structure 1012 to detect the fingerprint
  • the fingerprint detection light in the recognition area is guided to the optical fingerprint sensor 1011, so that the optical sensor array can receive the fingerprint detection light to detect the fingerprint information of the finger corresponding to the fingerprint detection light.
  • the fingerprint recognition area of the under-screen optical fingerprint recognition device 100 is located in the display area of the liquid crystal display 200, when the user needs to unlock or perform other fingerprint verification on the mobile terminal or electronic device using the under-screen optical fingerprint recognition device 100, Fingerprint input can be realized by pressing the user's finger 300 on the fingerprint recognition area of the liquid crystal display 200. Therefore, the display area of the liquid crystal display 200 can be basically extended to the front of the entire mobile terminal or electronic device, which satisfies Full screen requirements for high screen-to-body ratio.
  • the fingerprint recognition module 101 may also include other optical components, and the other optical components may be a filter layer.
  • the filter layer may be disposed between the optical path guiding structure 1012 and the optical fingerprint sensor 1011.
  • the filter layer is used for The interference light passing through the optical path guiding structure 1012 is filtered out to prevent the interference light from being received by the optical sensor array and affecting the fingerprint recognition performance.
  • the optical fingerprint sensor 1011, the optical path guiding structure 1012, and the filter layer may be packaged in the same optical component to form the fingerprint recognition module 101.
  • the liquid crystal display 200 further includes a transparent protective cover 203, such as a glass cover or a sapphire cover.
  • the transparent protective cover 203 is located above the liquid crystal panel 201 of the liquid crystal display 200 and covers the front surface of the liquid crystal panel 201. Therefore, in the embodiments of the present application, pressing the finger 300 on the liquid crystal display 200 may actually refer to the transparent protective cover 203 pressed on the liquid crystal panel 201 or the protective layer covering the surface of the transparent protective cover 203 (such as tempered film or Other protective films).
  • the under-screen optical fingerprint identification device 100 may use an invisible light source with a specific wavelength as the fingerprint excitation light source to realize optical fingerprint identification.
  • the under-screen optical fingerprint recognition device 100 may also include an infrared light source 102, which may be an infrared LED light source, an infrared vertical cavity surface emitting laser (VCSEL) or an infrared laser Diode (Laser Diode).
  • an infrared light source 102 which may be an infrared LED light source, an infrared vertical cavity surface emitting laser (VCSEL) or an infrared laser Diode (Laser Diode).
  • VCSEL infrared vertical cavity surface emitting laser
  • Laser Diode Laser Diode
  • the infrared light source 102 may be arranged below the edge area of the liquid crystal panel 201, or the infrared light source 102 may also be arranged on the side of the liquid crystal panel 201 and located side by side with the liquid crystal panel 201 under the transparent protective cover 203.
  • the infrared light emitted by the infrared light source 102 can be used as fingerprint excitation light, and the infrared light can be irradiated to the finger 300 above the fingerprint recognition area of the liquid crystal display 200 through the liquid crystal panel 201 or the transparent protective cover 203.
  • the infrared light may be reflected on the surface of the finger 300 or transmitted from the surface of the finger 300 to form infrared fingerprint detection light 1021. Therefore, the infrared fingerprint detection light 1021 carries the fingerprint information of the finger 300, and the infrared fingerprint detection light 1021 can further pass through the liquid crystal panel 201 and the backlight module 202 of the liquid crystal display 200, and be transmitted to the fingerprint under the backlight module 202 Recognition module 101.
  • the fingerprint recognition module 101 guides the infrared fingerprint detection light 1021 to the optical sensor array of the optical fingerprint sensor 1011 through the optical path guiding structure 1012.
  • the optical sensor array can receive the infrared fingerprint detection light 1021 and further detect the finger 300 according to the infrared fingerprint detection light 1021 Fingerprint information.
  • the backlight module 202 of the liquid crystal display 200 may include multiple backlight components.
  • the backlight module 202 may include a light guide plate 2021 and a reflective film 2022 that are stacked, and the light guide plate 2021 faces the liquid crystal panel 201, and the reflective film 2022 faces the fingerprint identification module 101.
  • the light guide plate 2021 is mainly used to guide the visible light source provided by the backlight to the liquid crystal display 200.
  • the reflective film 2022 totally reflects the visible light toward the upper side of the liquid crystal display screen 200.
  • the backlight module 202 may also include a circuit board 2026.
  • the liquid crystal panel 201 is connected to the controller through the circuit board 2026.
  • the circuit board 2026 is arranged on the side edge of the liquid crystal panel 201. In order to avoid leakage of the circuit board 2026, this area is usually also covered. Cover up.
  • FIG. 2 is a schematic diagram of the transmission of the existing infrared light between the light guide plate and the reflective film
  • FIG. 3 is a schematic diagram of the structure of the existing infrared light passing through the light guide plate and the reflective film to produce interference lines.
  • the light guide plate 2021 and the reflective film 2022 may be based on polyester resin (Polyethylene terephthalate, PET) materials.
  • the thickness of the light guide plate 2021 is 400um ⁇ 500um
  • the thickness of the reflective film 2022 is 70um ⁇ 90um
  • the thickness of the light guide plate 2021 and the reflective film 2022 is relatively thin
  • the light guide plate 2021 and the reflective film 2022 are relatively easy to absorb and produce deformation
  • the under-screen optical fingerprint identification device 100 when the infrared fingerprint detection light 1021 is transmitted to the light guide plate 2021 and the reflective film 2022 of the backlight module 202, it faces the surface of the light guide plate 2021 through the reflective film 2022
  • the spacing function of the supporting layer 20221 reduces the interference pattern formed by the infrared fingerprint detection light 1021 between the light guide plate 2021 and the reflective film 2022. That is, in the embodiment of the present application, a support layer 20221 is provided on the reflective film 2022 of the backlight module 202, wherein the support layer 20221 is located on the surface of the reflective film 2022 facing the light guide plate 2021.
  • the support layer 20221 increases the gap between the light guide plate 2021 and the reflective film 2022, reduces the degree of adsorption between the light guide plate 2021 and the reflective film 2022, and reduces the width and spacing of the interference pattern. At this time, the interference pattern becomes thinner. The spacing of the interference lines is changed from sparse to dense, thereby destroying the conditions for the formation of interference lines. This solves the problem of uneven contact between the light guide plate 2021 and the reflective film 2022 in the prior art, which easily produces Newton rings or interference lines that interfere with fingerprint imaging, thereby affecting fingerprint recognition.
  • the support layer 20221 increases the surface roughness of the reflective film 2022, thereby increasing the haze of the reflective film 2022, thereby shielding the interference pattern, which is beneficial to reduce the contrast of the interference pattern .
  • FIG. 4 is a schematic structural diagram of an under-screen optical fingerprint identification device provided by an embodiment of the application
  • FIG. 5 is a schematic structural diagram of a backlight module in an under-screen optical fingerprint identification device provided by an embodiment of the application
  • FIG. 6 is an embodiment of the application provided
  • an embodiment of the present application provides an optical fingerprint identification system for a liquid crystal display, including a liquid crystal display 200 and the under-screen optical fingerprint identification device 100 provided by any of the above embodiments, the under-screen optical fingerprint identification The device 100 is disposed under the liquid crystal display 200, and the under-screen optical fingerprint identification device 100 is used to detect fingerprint information of a finger above the liquid crystal display 200.
  • the liquid crystal display 200 includes a liquid crystal panel 201 and a backlight module 202.
  • the backlight module 202 is arranged below the liquid crystal panel 201; the backlight module 202 is used to provide a backlight source for the liquid crystal panel 201 and will be installed on the liquid crystal display 200.
  • the infrared fingerprint detection light 1021 formed by the upper finger 300 is transmitted to the under-screen optical fingerprint identification device 100 under the backlight module 202. That is, in this embodiment, the backlight module 202 can transmit the infrared fingerprint detection light 1021 to the fingerprint recognition module 101 of the under-screen optical fingerprint recognition device 100.
  • the backlight module 202 includes a laminated light guide plate 2021 and a reflective film 2022.
  • the reflective film 2022 faces the under-screen optical fingerprint identification device 100
  • the light guide plate 2021 faces the liquid crystal panel 201
  • the reflective film 2022 faces the light guide plate 2021.
  • the surface has a support.
  • the layer 20221 and the supporting layer 20221 are used to separate the light guide plate 2021 and the reflective film 2022.
  • the light guide plate 2021 is mainly used to guide the visible light source provided by the backlight to the liquid crystal display 200.
  • the reflective film 2022 totally reflects the visible light toward the upper side of the liquid crystal display screen 200.
  • a support layer 20221 is provided on the reflective film 2022 of the backlight module 202, wherein the support layer 20221 is located on the surface of the reflective film 2022 facing the light guide plate 2021.
  • the support layer 20221 increases the gap between the light guide plate 2021 and the reflective film 2022, reduces the degree of adsorption between the light guide plate 2021 and the reflective film 2022, and reduces the width and spacing of the interference pattern. At this time, the interference pattern becomes thinner. The spacing of the interference lines is changed from sparse to dense, thereby destroying the conditions for the formation of interference lines.
  • the supporting layer 20221 includes a plurality of first supporting portions 20222 arranged at intervals.
  • the first supporting parts 20222 may be spaced and evenly arranged, and the first supporting parts 20222 may also be arranged at irregular intervals.
  • each first supporting portion 20222 functions as a spacer between the light guide plate 2021 and the reflective film 2022, this embodiment is not limited herein.
  • each first support portion 20222 can be set on the reflective film 2022 by screen printing, roller printing, spraying or coating.
  • each first support portion 20222 can be set on the reflective film 2022 by screen printing, roller printing,
  • the spraying or coating method is arranged on the reflective film 2022 to form the support layer 20221, which can reduce the cost without the need to redesign the reflective film 2022.
  • the material of the support layer 20221 may be the same as the material of the reflective film 2022.
  • each first supporting portion 20222 may be the same.
  • each of the first supporting portions 20222 may be rectangular, triangular prism, triangular pyramid, truncated cone shape, spherical shape, or the like.
  • the surface of the first support portion 20222 facing the light guide plate 2021 is a curved surface.
  • the height range of the first support portion 20222 is 1 um to 3 um, that is, the thickness range of the first support portion 20222 is 1 um to 3 um.
  • the distance between the side of the first supporting portion 20222 facing the light guide plate 2021 and the side of the first supporting portion 20222 facing the reflective film 2022 ranges from 1 um to 3 um.
  • the height of each first support portion 20222um is 2.1um.
  • the light guide plate 2021 has a plurality of irregularly distributed second support portions 20211, and the second support portions 20211 are located on the surface of the light guide plate 2021 facing the reflective film 2022.
  • the surface of the light guide plate 2021 facing away from the reflective film 2022 may also be provided with a second support portion 20211, and the shape of the second support portion 20211 on the opposite side of the light guide plate 2021 may be the same or different.
  • This embodiment is not limited here.
  • the shape of the second support portion 20211 of the light guide plate 2021 facing the surface of the reflective film 2022 may be hemispherical.
  • the second supporting portion 20211 of the light guide plate 2021 facing the surface of the reflective film 2022 may also be referred to as a dot.
  • FIG. 7 is a schematic diagram of the inter-embedded structure of the first support portion and the second support portion in the backlight module of the under-screen optical fingerprint identification device provided by an embodiment of the application.
  • the distance between the two opposite sides of the first support portion 20222 is greater than or equal to the maximum distance between the second support portions 20111, that is, Pmax in FIG. 6.
  • the distance between the two opposite sides of the first supporting portion 20222 may be referred to as the width of the first supporting portion 20222, that is, the width W of the first supporting portion 20222 in FIG. 6.
  • the distance between two adjacent first supporting parts 20222 is less than or equal to the minimum distance 20211 between the second supporting parts, that is, Pmin in FIG. 6.
  • the distance between two adjacent first support portions 20222 refers to X in FIG. 6.
  • each second support portion 20211 is irregularly distributed, that is, the two adjacent second support portions 20211 are different, as long as the distance between the two opposite sides of the first support portion 20222 is greater than or equal to each adjacent second support
  • the maximum distance between the portions 20111, and the distance between two adjacent first support portions 20222 is less than or equal to the minimum distance 20211 between each second support portion. This can ensure that the first support portion 20222 can better eliminate interference lines, increase the height between the reflective film 2022 and the dots of the light guide plate 2021, and prevent the first support portion 20222 of the reflective film 2022 and the dots of the light guide plate 2021 from inter-embedding ( As shown in Figure 7).
  • the dots of the light guide plate 2021 close to the backlight source are relatively sparse, the maximum spacing between the dots is 130 um to 200 um, and the minimum spacing between the dots is about 50 um to 100 um. Therefore, in the specific implementation of the present application, the distance between the two opposite sides of the first support portion 20222 ranges from 130 um to 250 um. Optionally, the distance between two opposite sides of the first support portion 20222 is 160 um.
  • the distance P between the centers of two adjacent first support portions 20222 ranges from 180 um to 300 um.
  • the distance between the centers of two adjacent first support portions 20222 is 300um.
  • FIG. 8 is a diagram of the first arrangement of the first supporting part in the backlight module of the under-screen optical fingerprint identification device provided by the embodiment of the application
  • FIG. 9 is the backlight of the under-screen optical fingerprint identification device provided by the embodiment of the application
  • the plurality of first supporting portions 20222 are regularly arranged.
  • the first support portions 20222 may also be arranged in other forms, such as an array form of five-pointed stars, etc., which is not limited in this embodiment.
  • the backlight module 202 further includes a reinforcing plate 2023, which is located on the surface of the reflective film 2022 facing the fingerprint identification module 101, and the reinforcing plate 2023 has a light-transmitting hole 20231.
  • the reinforcing plate 2023 is used for shading, and only the infrared fingerprint detection light 1021 is allowed to pass to the fingerprint recognition module 101 through the light-transmitting hole 20231.
  • the reinforcing plate 2023 can be a steel plate or the like.
  • each first support portion 20222 may be provided only in a part of the reflective film 2022, as long as each first support portion 20222 can cover the light-transmitting hole 20231.
  • the backlight module 202 further includes a homogenizing film 2024, and the homogenizing film 2024 covers the side of the light guide plate 2021 facing away from the reflective film 2022.
  • the homogenizing film 2024 is used for uniform visible light, and the visible light is more uniform.
  • the thickness of the homogenizing film 2024 can range from 45 um to 55 um.
  • the backlight module 202 further includes a brightness enhancement film 2025, and the brightness enhancement film 2025 covers the side of the light homogenizing film 2024 facing away from the light guide 2022 plate.
  • the brightness enhancement film 2025 is used to correct the light exit angle of the backlight to enhance the front light.
  • the liquid crystal display optical fingerprint recognition system provided by the above embodiment is provided with a backlight module 202, which includes a light guide plate 2021 and a reflective film 2022.
  • the reflective film 2022 has a support layer 20221 and a support layer 20221 on the surface facing the light guide plate 2021. Used to space the light guide plate 2021 and the reflective film 2022.
  • the supporting layer 20221 includes a plurality of first supporting parts 20222 arranged at intervals by arranging.
  • the gap between the reflective film 2022 and the light guide plate 2021 is increased, and the first supporting portion 20222 increases the haze of the upper surface of the reflective film 2022 to eliminate or weaken the interference pattern between the light guide plate 2021 and the reflective film 2022 , To reduce the contrast of interference lines.
  • the distance and height of the first supporting portion 20222 and the setting of the size relationship between the first supporting portion 20222 and the second supporting portion 20211 on the light guide plate 2021 can be used to reduce the interference pattern between the light guide plate 2021 and the reflective film 2022.
  • the first supporting part 20222 can effectively reduce the concentric interference pattern formed between the reflective film 2022 and the light guide plate 2021, without greatly affecting the display brightness, and achieve a balance between the interference pattern, display brightness, and fingerprint performance under the screen. .
  • FIG. 10 is a schematic diagram of the structure of a reflective film provided by an embodiment of the application.
  • the present application provides a reflective film suitable for a liquid crystal display screen 200 supporting under-screen fingerprint recognition.
  • the reflective film 2022 includes a light-permeable substrate layer 20223 and is provided on one side of the substrate layer 20223
  • the supporting layer 20221 and the supporting layer 20221 are used to cover the light guide plate 2021 above the reflective film 2022 at intervals to reduce the interference pattern formed by the infrared fingerprint detection light 1021 between the light guide plate 2021 and the reflective film 2022, so that it is above the liquid crystal display 200
  • the infrared fingerprint detection light 1021 formed by the finger 300 is transmitted to the under-screen optical fingerprint recognition device 100 under the liquid crystal display 200 through the reflective film 2022.
  • the support layer 20221 may be arranged on the substrate layer 20223 at even intervals, that is, the substrate layer 20223 is provided with the support layer 20221 instead of only a part of the substrate layer 20223, which facilitates the processing of the reflective film 2022.
  • the present application also provides a liquid crystal display 200 supporting an under-screen fingerprint recognition function, including a liquid crystal panel 201 and a backlight module 202, and the backlight module 202 is arranged under the liquid crystal panel 201;
  • the backlight module 202 is used to provide a backlight source for the liquid crystal panel 201, and transmits the infrared fingerprint detection light 1021 formed by the finger 300 above the liquid crystal display 200 to the under-screen optical fingerprint identification device 100 below the backlight module 202; wherein, The backlight module 202 includes the reflective film 2022 provided in the second or third embodiment above.
  • the distance between the reflective film 2022 and the support layer 20221 on the surface of the light guide plate 2021 reduces the infrared fingerprint detection light.
  • the support layer 20221 increases the gap between the light guide plate 2021 and the reflective film 2022, reduces the degree of adsorption between the light guide plate 2021 and the reflective film 2022, reduces the width and spacing of the interference pattern, and when the interference pattern becomes thinner, the interference
  • the spacing of the lines changes from dense to sparse, which destroys the conditions for forming interference lines. This solves the problem of uneven contact between the light guide plate 2021 and the reflective film 2022 in the prior art, which easily produces Newton rings or interference lines that interfere with fingerprint imaging, thereby affecting fingerprint recognition.
  • the support layer 20221 increases the surface roughness of the reflective film 2022, thereby increasing the haze of the reflective film 2022, thereby shielding the interference pattern, which is beneficial to reduce the contrast of the interference pattern .

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Human Computer Interaction (AREA)
  • Optics & Photonics (AREA)
  • Image Input (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

L'invention concerne un appareil et un système de reconnaissance d'empreintes digitales optique sous-écran, un film réfléchissant et un écran d'affichage à cristaux liquides. L'appareil de reconnaissance d'empreintes digitales optique sous-écran peut être appliqué à un écran d'affichage à cristaux liquides avec un module de rétroéclairage ; une zone de reconnaissance d'empreintes digitales de l'appareil de reconnaissance optique d'empreintes digitales sous-écran est située dans une zone d'affichage de l'écran d'affichage à cristaux liquides ; et l'appareil de reconnaissance optique d'empreintes digitales sous-écran comprend un module de reconnaissance d'empreintes digitales, et le module de reconnaissance d'empreintes digitales comprend un capteur optique d'empreintes digitales et une structure de guidage de trajet optique, lorsque la lumière de détection d'empreintes digitales infrarouge est transmise à une plaque de guidage de lumière et à un film réfléchissant du module de rétroéclairage, des lignes d'interférence formées par la lumière de détection d'empreintes digitales infrarouge entre la plaque de guidage de lumière et le film réfléchissant sont réduites au moyen de la fonction d'espacement d'une couche de support sur la surface du film réfléchissant qui fait face à la plaque de guidage de lumière.
PCT/CN2019/119721 2019-11-20 2019-11-20 Appareil et système de reconnaissance optique d'empreintes digitales sous-écran, film réfléchissant et écran d'affichage à cristaux liquides WO2021097712A1 (fr)

Priority Applications (2)

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PCT/CN2019/119721 WO2021097712A1 (fr) 2019-11-20 2019-11-20 Appareil et système de reconnaissance optique d'empreintes digitales sous-écran, film réfléchissant et écran d'affichage à cristaux liquides
CN201980004397.2A CN111095290B (zh) 2019-11-20 2019-11-20 屏下光学指纹识别装置及系统、反射膜和液晶显示屏

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PCT/CN2019/119721 WO2021097712A1 (fr) 2019-11-20 2019-11-20 Appareil et système de reconnaissance optique d'empreintes digitales sous-écran, film réfléchissant et écran d'affichage à cristaux liquides

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