WO2020258767A1 - Module de rétroéclairage à points quantiques et dispositif électronique - Google Patents

Module de rétroéclairage à points quantiques et dispositif électronique Download PDF

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Publication number
WO2020258767A1
WO2020258767A1 PCT/CN2019/126120 CN2019126120W WO2020258767A1 WO 2020258767 A1 WO2020258767 A1 WO 2020258767A1 CN 2019126120 W CN2019126120 W CN 2019126120W WO 2020258767 A1 WO2020258767 A1 WO 2020258767A1
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WO
WIPO (PCT)
Prior art keywords
quantum dot
backlight module
quantum
quantum dots
composite film
Prior art date
Application number
PCT/CN2019/126120
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English (en)
Chinese (zh)
Inventor
张小齐
卢志坚
蔡锋毅
Original Assignee
深圳市隆利科技股份有限公司
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Publication of WO2020258767A1 publication Critical patent/WO2020258767A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/1365—Matching; Classification
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light

Definitions

  • the present invention relates to the field of communication technology, and in particular to a quantum dot backlight module and electronic equipment for fingerprint recognition in an LCD screen.
  • Fingerprint sensing and matching is a reliable and widely used technology.
  • the common method of fingerprint identification involves scanning a sample fingerprint or its image and storing the image and/or unique characteristics of the fingerprint image.
  • the characteristics of the sample fingerprint can be compared with the information of the reference fingerprint already existing in the database to determine the correct identification of the user , For example for verification purposes.
  • in-display fingerprint recognition has become more and more popular due to its ease of operation and versatility, as well as its suitability for compact portable electronic devices.
  • the fingerprint recognition display device in the LCD screen obviously has a larger use scene range and better cost advantage than the fingerprint recognition display device in the OLED screen.
  • the fingerprint recognition display device in the screen based on the LCD display is not fully mature, especially Take into account the effective penetration and accurate collection of fingerprint identification signals on the LCD module.
  • the fingerprints on the glass cover 104 covered on the LCD display are recognized by pressing; however, the optical signal used to recognize the fingerprints must pass through the LCD display at least The screen and the glass cover 104, and since the LCD display is composed of the LCD module 102 and the backlight module 101, the glass cover has a certain thickness. Therefore, when the optical signal passes through the LCD module, the backlight module, and the glass cover, severe refraction, scattering, and even total reflection occur.
  • CN107644215A discloses an optical fingerprint assembly and a mobile terminal to effectively improve the clarity of fingerprint recognition.
  • An optical fiber collimation layer is arranged between a transparent cover plate and a photosensitive element.
  • the optical fiber collimation layer is used to face the transparent cover plate
  • the light emitted from the end face of the photosensitive element is converted into collimated light, which is transmitted to the photosensitive element.
  • the optical fiber collimation layer and other optical function layers increase the thickness of the LCD mobile terminal, and there is no distinction between the biological fingerprint optical signal and the display optical signal, resulting in uneven display images and low fingerprint recognition accuracy.
  • the main technical problem to be solved by the present invention is to provide a quantum dot backlight module and LCD module for fingerprint recognition in the LCD screen, which can make the fingerprint recognition signal on the LCD module without a diffuser and prism sheet. Effective penetration and accurate collection.
  • the quantum dot backlight module includes a light source and a light guide plate arranged on one side of the light source, a reflective sheet arranged below the light guide plate, and a quantum dot composite set above the light guide plate Film, a prism sheet set above the quantum dot composite film, and a fingerprint recognition device set below the quantum dot composite film to identify biological fingerprint optical signals; wherein the quantum dot composite film contains the first quantum dot and the second quantum dot .
  • the light source is a blue LED light source.
  • the red and green quantum dots with different particle sizes and or materials are irradiated by the blue LED to produce red and green fluorescence, thereby forming the three primary colors of red, green and blue (RGB), or irradiating red and yellow quantum dots to produce red and yellow Fluorescence forms the three primary colors of red, yellow and blue (RYB).
  • the infrared light is basically not absorbed or scattered by the quantum dots, so it can pass through the quantum dot composite film substantially vertically.
  • the quantum dot composite film adjusts the emitted infrared optical signal to parallel light substantially perpendicular to the plane of the quantum dot composite film, while ensuring that visible light (red, green and blue) can be uniformly scattered.
  • the quantum dot backlight module of the present invention even if the diffusion sheet and prism sheet are not provided, the infrared light signal that can be used for detection can pass through the quantum dot backlight module and be accurately transmitted to biological detection objects, such as fingerprints.
  • the feedback infrared light signal of the detection object can be folded back through the quantum dot composite film and the quantum dot backlight module in a nearly non-destructive manner, and is accurately and effectively collected by the optical sensor under the LCD screen, while maintaining the quantum dot backlight module
  • the luminous brightness and uniformity of the visible light source can realize the fingerprint recognition function of the LCD display and maintain the display effect.
  • the quantum dot backlight module of the present invention reduces the arrangement of the diffusion sheet and the prism sheet, provides more design space for the LCD display with the fingerprint recognition function in the screen, and realizes the lightness and thinness of the whole electronic device.
  • the quantum dot composite film includes a first barrier film, a quantum dot fluorescent film disposed on the first barrier film, and a second barrier film disposed on the quantum dot fluorescent film.
  • the first barrier film and the second barrier film can effectively prevent the quantum dots from being oxidized by water and oxygen in the outside air to cause fluorescence failure. Further, the first barrier film and the second barrier film completely encapsulate the quantum dot fluorescent film.
  • the quantum dot composite film is provided with a light diffusion unit for diffusing and evenly distributing visible light.
  • the first barrier film, the quantum dot fluorescent film and the second barrier film comprise polyethylene terephthalate (PET).
  • the first quantum dot and the second quantum dot include quantum dots.
  • the light-emitting layer adopts quantum dots including binary phase, ternary phase, quaternary phase quantum dots, pentad phase and various core-shell structure quantum dots.
  • alloy structure quantum dots wherein the binary phase quantum dots include at least one of CdSe, CdS, PbSe, PbS, ZnS, InP, HgS, AgS quantum dots, and the ternary phase quantum dots include Zn X Cd 1-X At least one of S/ZnS, CuInS, PbSe X S 1-X /PbS quantum dots, the quaternary phase quantum dots include CuInSeS, ZnXCd 1-X SeYS 1-Y , Zn X Cd 1-X Se/ZnS At least one of CdSe/CdS, InP/ZnS, CuInS/ZnS quantum dots, the five-element phase quantum dots include at least one of InP/ZnSeS,
  • the quantum dot backlight module further includes a prism sheet, and the prism sheet is arranged above the quantum dot composite film.
  • the quantum dot backlight module further includes a diffusion sheet, which is arranged between the quantum dot composite film and the prism sheet.
  • the quantum dot backlight module further includes an optical sensor element to transmit and/or receive a biological fingerprint optical signal; the biological fingerprint optical signal is infrared light.
  • the fingerprint identification device is arranged between the light guide plate and the reflective sheet; or the fingerprint identification device is arranged between the light guide plate and the quantum dot composite film; or the fingerprint identification device is arranged between Below the reflective sheet.
  • the fingerprint identification device is embedded in the quantum dot composite film to replace the arrangement of the fingerprint identification device under the quantum dot composite film.
  • the quantum dot backlight module of the present invention is integrated with the LCD panel, the glass cover plate and the touch screen module into an electronic device, which can be applied to LCD displays and electronic devices for fingerprint identification.
  • the quantum dot backlight module of the present invention is applied to electronic equipment for fingerprint identification, and can realize accurate identification and verification of biological fingerprint information.
  • Fig. 1 is an in-screen fingerprint identification display device of a prior art LCD display.
  • FIG. 2 is an exploded view of the quantum dot backlight module of Embodiment 1 of the present invention.
  • Example 3 is a cross-sectional structure diagram of the quantum dot composite film of Example 1 of the present invention.
  • FIG. 4 is an exploded view of the quantum dot backlight module of Embodiment 2 of the present invention.
  • FIG. 5 is an exploded view of the quantum dot backlight module of Embodiment 3 of the present invention.
  • FIG. 6 is an exploded view of the quantum dot backlight module of Embodiment 4 of the present invention.
  • the quantum dot backlight module of Embodiment 1 of the present invention includes a light source 221 and a light guide plate 220 arranged on one side of the light source 221, and a reflective sheet 210 arranged below the light guide plate 220 is arranged on the light guide plate 220
  • the reflective sheet 210 is an infrared transparent visible light reflective material. On the one hand, it can reflect the visible light emitted by the light guide plate with high reflectivity, and on the other hand, it can transmit infrared light nearly losslessly.
  • the quantum dot backlight module of this embodiment is used to detect the emitted infrared optical signal accurately propagating to the detected object for detection. On the other hand, the feedback infrared light signal of the detected object can pass through the quantum dot composite film and the quantum dot backlight nearly without damage The module is accurately and effectively collected by the optical sensor under the LCD screen to realize the fingerprint recognition function of the LCD display.
  • the quantum dot backlight module of this embodiment reduces the arrangement of diffusion sheets and prism sheets, provides more design space for the LCD display with in-screen fingerprint recognition function, and realizes the lightness and thinness of the whole electronic device.
  • the light source 221 is a blue LED light source, and the light source is a blue LED light source.
  • the red CdSeS quantum dots and green CdZnSeS quantum dots with different particle sizes and or materials are irradiated by the blue LED to generate red and green fluorescence, thereby forming the three primary colors of red, green and blue (RGB), Or irradiate red and yellow quantum dots to produce red and yellow fluorescence to form the three primary colors of red, yellow and blue (RYB).
  • the first quantum dots in the quantum dot composite film 230 are red fluorescent quantum dots, and the second quantum dots, green fluorescent quantum dots, have a particle size of 1-20 nanometers, and their fluorescence emits light in the form of non-directional scattering, so the quantum dots composite
  • the film 230 realizes the function of uniformly diffusing visible light.
  • the infrared light is basically not absorbed or scattered by the quantum dots, so it can pass through the quantum dot composite film 230 substantially vertically.
  • the quantum dot composite film 230 adjusts the emitted infrared optical signal into parallel light substantially perpendicular to the plane of the quantum dot composite film 230, while ensuring that visible light (red, green and blue) can be uniformly scattered.
  • the quantum dot composite film 230 includes a first barrier film 2301, a quantum dot fluorescent film 2302 disposed on the first barrier film, and a second barrier film 2303 disposed on the quantum dot fluorescent film.
  • the first barrier film 2301 and the second barrier film 2303 can effectively prevent the quantum dots from being oxidized by water and oxygen in the outside air to cause fluorescence failure.
  • the first barrier film 2301 and the second barrier film 2303 completely encapsulate the quantum dot fluorescent film.
  • the first barrier film 2301, the quantum dot fluorescent film 2302, and the second barrier film 2303 include polyethylene terephthalate (PET).
  • PET polyethylene terephthalate
  • the quantum dot composite film 230 is provided with a light diffusion unit of a trapezoidal cylindrical light diffusion array.
  • the fingerprint identification device 103 of the quantum dot backlight module also includes an optical sensor element to transmit and receive the biological fingerprint optical signal; the biological fingerprint optical signal is infrared light.
  • the quantum dot backlight module of this embodiment does not need to be provided with a diffusion sheet and a prism sheet, and the infrared light signal used for detection can pass through the quantum dot backlight module and be accurately transmitted to biological detection objects, such as fingerprints.
  • the feedback infrared light signal of the detection object can be folded back through the quantum dot composite film 230 and the quantum dot backlight module in a nearly non-destructive manner, and is accurately and effectively collected by the optical sensor under the LCD screen, while keeping the quantum dot backlight module visible
  • the luminous brightness and uniformity of the light source realize the fingerprint recognition function of the LCD display and maintain the display effect.
  • FIG. 4 is an exploded view of a quantum dot backlight module based on a quantum dot composite film according to Embodiment 2 of the present invention.
  • the fingerprint identification device is arranged between the light guide plate 220 and the reflection 210.
  • FIG. 5 is an exploded view of a quantum dot backlight module based on a quantum dot composite film according to Embodiment 3 of the present invention. Only the differences between Embodiment 3 and Embodiment 1 will be described below, and the similarities will not be repeated here.
  • the fingerprint identification device is disposed between the light guide plate 220 and the quantum dot composite film 230.
  • FIG. 6 is an exploded view of a quantum dot backlight module based on a quantum dot composite film according to Embodiment 4 of the present invention. Only the differences between Embodiment 4 and Embodiment 1 will be described below. The similarities will not be repeated here.
  • the quantum dot backlight module is also provided with a prism sheet 240 and a diffusion sheet 250. Above the dot composite film 230, the diffusion sheet 250 is disposed between the quantum dot composite film 230 and the prism sheet 240.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un module de rétroéclairage à points quantiques pour la reconnaissance d'empreintes digitales dans l'affichage d'un LCD, comprenant une source de lumière (221), une plaque de guidage de lumière (220) disposée sur un côté de la source de lumière (221), une feuille réfléchissante (210) disposée au-dessous de la plaque de guidage de lumière (220), un film composite à points quantiques (230) disposé au-dessus de la plaque de guidage de lumière (220), et un appareil de reconnaissance d'empreintes digitales disposé au-dessous du film composite à points quantiques (230) pour reconnaître des signaux optiques d'empreintes digitales biologiques. Le film composite à points quantiques (230) contient des premiers points quantiques et des seconds points quantiques. Au moyen du module de rétroéclairage à points quantiques, le module LCD permet à des signaux de reconnaissance d'empreintes digitales de pénétrer efficacement dans le module LCD et d'être collectés avec précision, réalisant une fonction de reconnaissance d'empreintes digitales dans l'affichage d'un dispositif d'affichage LCD.
PCT/CN2019/126120 2019-06-28 2019-12-18 Module de rétroéclairage à points quantiques et dispositif électronique WO2020258767A1 (fr)

Applications Claiming Priority (2)

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CN201910575170.5 2019-06-28
CN201910575170.5A CN110308587A (zh) 2019-06-28 2019-06-28 量子点背光模组及电子设备

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CN110308587A (zh) * 2019-06-28 2019-10-08 深圳市隆利科技股份有限公司 量子点背光模组及电子设备
US11385498B1 (en) 2021-01-25 2022-07-12 Shenzhen Longli Technology Co., Ltd. Mura-compensable direct-lit mini-LED backlight module

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US20160266695A1 (en) * 2015-03-10 2016-09-15 Crucialtec Co., Ltd. Display apparatus having image scanning function
CN109902649A (zh) * 2019-03-11 2019-06-18 深圳阜时科技有限公司 生物特征检测模组和背光模组、显示器及电子装置
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