WO2020191832A1 - Dispositif d'affichage à cristaux liquides et son procédé de fabrication - Google Patents

Dispositif d'affichage à cristaux liquides et son procédé de fabrication Download PDF

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Publication number
WO2020191832A1
WO2020191832A1 PCT/CN2019/083075 CN2019083075W WO2020191832A1 WO 2020191832 A1 WO2020191832 A1 WO 2020191832A1 CN 2019083075 W CN2019083075 W CN 2019083075W WO 2020191832 A1 WO2020191832 A1 WO 2020191832A1
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WIPO (PCT)
Prior art keywords
liquid crystal
crystal display
conversion layer
layer
display device
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PCT/CN2019/083075
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English (en)
Chinese (zh)
Inventor
韦宏权
陈兴武
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深圳市华星光电技术有限公司
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Publication of WO2020191832A1 publication Critical patent/WO2020191832A1/fr

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    • 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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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 display technology, in particular to a liquid crystal display device and a manufacturing method thereof.
  • Thin Film Transistor-Liquid Crystal Display has many advantages such as thin body, power saving, and no radiation, and has been widely used. Such as: LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen or notebook computer screen, etc., occupy a dominant position in the field of flat panel display.
  • Most of the liquid crystal displays on the current market are backlit liquid crystal displays, which include liquid crystal panels and backlight modules (Backlight Module).
  • the working principle of the liquid crystal panel is to apply a driving voltage on the Thin Film Transistor Array Substrate (TFT Array Substrate) and the Color Filter (CF) substrate to control the rotation direction of the liquid crystal molecules between the two substrates.
  • the light from the backlight module is refracted to produce a picture.
  • Quantum dot luminescent materials comply with the quantum size effect, and their properties change with the size of the quantum dots. When stimulated by light or electricity, quantum dots emit colored light. The color of the light is related to its nature, so the light emitted by it can be controlled by changing its size. Quantum dot luminescent materials have the advantages of concentrated emission spectrum and high color purity.
  • the use of quantum dot luminescent materials in the field of display technology can greatly increase the color gamut of traditional displays and enhance the color reproduction capability of the display.
  • the quantum dot backlight module takes advantage of this feature of quantum dots, uses the backlight to irradiate the quantum dot layer to excite different colors of color light, and the same part of the color light that passes through the quantum dots is mixed to obtain white light, thereby improving the overall backlight module Luminous effect.
  • an existing liquid crystal display device using a quantum dot backlight module includes a backlight module 10, a quantum dot layer 20, a cut-off layer 30, a lower polarizer 40, a liquid crystal display panel 50, and
  • the upper polarizer 60 requires high-energy backlight lasers, such as ultraviolet light and blue light, to be excited by the quantum dot layer 20. These short-wavelength lights are more harmful to human eyes.
  • a cut-off layer 30 is added to cut off low-wavelength light such as ultraviolet light and blue light to prevent leakage.
  • the cut-off layer 30 also reduces the light utilization rate of the backlight and affects the transmittance of the display.
  • the object of the present invention is to provide a liquid crystal display device that can improve the utilization rate of the backlight and the transmittance of the display device.
  • the object of the present invention is also to provide a method for manufacturing a liquid crystal display device, which can improve the utilization rate of the backlight and the transmittance of the display device.
  • the present invention provides a liquid crystal display device, which includes a backlight module, a quantum dot layer arranged on the light-emitting side of the backlight module, and a light-induced A luminescence conversion layer, a liquid crystal display panel disposed on the side of the photoluminescence conversion layer away from the quantum dot layer, and a polarizer disposed on the side of the liquid crystal display panel away from the photoluminescence conversion layer;
  • the backlight module is used to emit a backlight to excite the quantum dot layer to emit light
  • the photoluminescence conversion layer is used to convert the backlight passing through the quantum dot layer into polarized light with a wavelength greater than 460 nm.
  • the backlight emitted by the backlight module is blue or ultraviolet light.
  • the material of the photoluminescence conversion layer includes a first compound obtained by introducing a photoluminescence group into the side chain of a dichroic dye.
  • the dichroic dye is an azo compound
  • the photoluminescent group is one or a combination of polyfluorene, polythiophene, polypyrrole or polyaniline.
  • the present invention provides a method for manufacturing a liquid crystal display device, which includes the following steps:
  • Step S1 Provide a backlight module, and form a quantum dot layer on the light exit side of the backlight module, and the backlight module can emit a backlight to stimulate the quantum dot layer to emit light;
  • Step S2 forming a photoluminescence conversion layer on the side of the quantum dot layer away from the backlight module, the photoluminescence conversion layer being able to convert the backlight passing through the quantum dot layer into polarized light with a wavelength greater than 460nm;
  • Step S3 disposing a liquid crystal display panel on the side of the photoluminescence conversion layer away from the quantum dot layer, and disposing a polarizer on the side of the liquid crystal display panel away from the photoluminescence conversion layer.
  • the backlight emitted by the backlight module is blue or ultraviolet light.
  • the step S2 specifically includes:
  • Step S21 Provide a solution, the solution comprising a first compound, a small molecule polymerizable monomer, a solvent and additives, the first compound is obtained by introducing a photoluminescent group into the side chain of the dichroic dye;
  • Step S22 coating the solution and aligning it to form a photoluminescence conversion layer.
  • the step S22 includes:
  • An alignment layer is formed first, the solution is coated on the alignment layer, and the solution is heated to cure the solution into a film to form the photoluminescence conversion layer.
  • the dichroic dye is an azo compound
  • the step S22 includes: coating the solution, heating the solution to cure the solution into a film, and irradiating the film layer cured by the solution with linearly polarized ultraviolet light in the same direction to align the film layer to form the Photoluminescence conversion layer.
  • the dichroic dye is an azo compound
  • the photoluminescent group is one or a combination of polyfluorene, polythiophene, polypyrrole or polyaniline.
  • the present invention provides a liquid crystal display device, which includes a backlight module, a quantum dot layer arranged on the light-emitting side of the backlight module, and a light arranged on the side of the quantum dot layer away from the backlight module.
  • An electroluminescence conversion layer a liquid crystal display panel disposed on the side of the photoluminescence conversion layer away from the quantum dot layer, and a polarizer disposed on the side of the liquid crystal display panel away from the photoluminescence conversion layer;
  • the backlight module is used to emit backlight to excite the quantum dot layer to emit light;
  • the photoluminescence conversion layer is used to convert the backlight passing through the quantum dot layer into polarized light with a wavelength greater than 460nm, and the photoluminescence conversion layer
  • the low-wavelength backlight is converted into polarized light with a wavelength greater than 460nm, which can save the existing commonly used lower polarizer and improve the utilization rate of the backlight and the transmittance of the display device.
  • the present invention also provides a method for manufacturing a liquid crystal display device, which can omit the lower polarizer and improve the utilization rate of the backlight and the transmittance of the display device.
  • FIG. 1 is a schematic diagram of a conventional liquid crystal display device
  • FIG. 2 is a schematic diagram of the liquid crystal display device of the present invention.
  • step S2 is a schematic diagram of step S2 of the second embodiment of the manufacturing method of the liquid crystal display device of the present invention.
  • FIG. 5 is a flowchart of a method of manufacturing the liquid crystal display device of the present invention.
  • the present invention provides a liquid crystal display device including a backlight module 1, a quantum dot layer 3 arranged on the light-emitting side of the backlight module 1, and a quantum dot layer 3 arranged on the quantum dot layer 3 away from the backlight module 1
  • the backlight module 1 is used to emit a backlight to excite the quantum dot layer 3 to emit light;
  • the photoluminescence conversion layer 4 is used for converting light incident on the photoluminescence conversion layer 4 into polarized light with a wavelength greater than 460 nm.
  • the backlight emitted by the backlight module 1 is blue light or ultraviolet light.
  • the material of the photoluminescence conversion layer 4 includes a first compound obtained by introducing a photoluminescence group into the side chain of a dichroic dye, and the structure of the first compound is as follows:
  • A is a dichroic dye
  • B is a photoluminescent group
  • the dichroic dye is an azo compound
  • the photoluminescent group can be selected from polyfluorene, polythiophene, polypyrrole and It can be selected from polyaniline
  • the photoluminescent group introduced can be one or a combination of the above-mentioned polyfluorene, polythiophene, polypyrrole, and polyaniline.
  • the photoluminescent group can be excited by light from 200 nm to 460 nm to emit light with a wavelength greater than 460 nm.
  • the dichroic dye in the photoluminescence conversion layer 4 of the present invention has been aligned to have a uniform alignment direction, and the photoluminescent groups introduced into the side chain of the dichroic dye also have a uniform alignment direction. Therefore, the light emitted by the photoluminescence group is excited to have the same exit direction, that is, the light emitted by the photoluminescence conversion layer 4 is polarized light, so that the photoluminescence conversion layer 4 can simultaneously replace the existing technology.
  • the cut-off layer and the lower polarizer can not only prevent short-wavelength light from being emitted to human eyes, but also realize the conversion of polarized light, which can effectively improve the utilization rate of the backlight and the transmittance of the display device.
  • the photoluminescence conversion layer 4 has a polarization axis perpendicular to the polarization axis of the polarizer 5.
  • the present invention also provides a manufacturing method of a liquid crystal display device, including the following steps:
  • Step S1 a backlight module 1 is provided, and a quantum dot layer 3 is formed on the light exit side of the backlight module 1, and the backlight module 1 can emit a backlight to excite the quantum dot layer 3 to emit light.
  • the backlight emitted by the backlight module 1 is blue light or ultraviolet light.
  • Step S2 A photoluminescence conversion layer 4 is formed on the side of the quantum dot layer 3 away from the backlight module 1.
  • the photoluminescence conversion layer 4 can convert the backlight passing through the quantum dot layer 3 to a wavelength greater than 460nm Polarized light.
  • step S2 specifically includes:
  • Step S21 Provide a solution, the solution including a first compound, a small molecule polymerizable monomer, a solvent and additives, and the first compound is obtained by introducing a photoluminescent group into the side chain of the dichroic dye.
  • the structure of the first compound is as follows:
  • A is a dichroic dye
  • B is a photoluminescent group
  • the dichroic dye is an azo compound
  • the photoluminescent group can be selected from polyfluorene, polythiophene, polypyrrole and It can be selected from polyaniline
  • the photoluminescent group introduced can be one or a combination of the above-mentioned polyfluorene, polythiophene, polypyrrole, and polyaniline.
  • the mass ratio of the first compound is 1% to 30%
  • the mass ratio of the small molecule polymerizable monomer is 10% to 30%
  • the mass ratio of the solvent is 50% to 80%.
  • the mass ratio of additives is 0.1% to 0.5%.
  • the small-molecule polymerizable monomer is a small-molecule polymerizable monomer containing polymerizable chain groups such as double bonds, acrylic ester groups, and methacrylic ester groups
  • the solvent is acetone, toluene, propylene glycol, and dichloromethane.
  • methane and chloroform, and the additives include photoinitiators and dispersants.
  • Step S22 coating the solution and aligning it to form the photoluminescence conversion layer 4.
  • the alignment method in step S22 includes two methods: physical alignment and optical alignment.
  • the step S22 includes:
  • an alignment layer 101 is formed, and the solution is coated on the alignment layer 101, and heated to cure the solution into a film to form the photoluminescence conversion layer 4.
  • the material of the alignment layer 101 can be selected from polyimide (PI), the alignment layer 101 is aligned to have a uniform alignment pattern, the solution is coated on the alignment layer 101 and heated so that The solution is cured into a film, and the film layer generates a corresponding pattern along with the alignment pattern on the alignment layer 101, thereby completing the alignment of the film layer, and forming the photoluminescence conversion layer 4.
  • PI polyimide
  • the solvent is volatilized by heating and the small-molecule polymerizable monomer is promoted to polymerize, so that the solution is cured into a film.
  • the dichroic dye is an azo compound
  • optical alignment can also be used.
  • the step S22 includes: coating the solution on the carrier 100, heating to cure the solution into a film, and irradiating the solution with linearly polarized ultraviolet light in the same direction to cure
  • the obtained film layer utilizes azo molecules to respond to ultraviolet polarized light, undergo isomerization, complete the alignment of the film layer, and form the photoluminescence conversion layer 4.
  • the solvent is volatilized by heating and the small-molecule polymerizable monomer is promoted to polymerize, so that the solution is cured into a film.
  • the dichroic dye in the photoluminescence conversion layer 4 of the present invention has been aligned to have a uniform alignment direction, and the photoluminescent groups introduced into the side chain of the dichroic dye also have a uniform alignment direction. Therefore, the light emitted by the photoluminescence group is excited to have the same exit direction, that is, the light emitted by the photoluminescence conversion layer 4 is polarized light, so that the photoluminescence conversion layer 4 can simultaneously replace the existing technology.
  • the cut-off layer and the lower polarizer can not only prevent short-wavelength light from being emitted to human eyes, but also realize the conversion of polarized light, which can effectively improve the utilization rate of the backlight and the transmittance of the display device.
  • the photoluminescence conversion layer 4 has a polarization axis perpendicular to the polarization axis of the polarizer 5.
  • the present invention provides a liquid crystal display device, which includes a backlight module, a quantum dot layer arranged on the light-emitting side of the backlight module, and a light-induced light emitting diode layer arranged on the side of the quantum dot layer away from the backlight module.
  • the module is used to emit a backlight to excite the quantum dot layer to emit light;
  • the photoluminescence conversion layer is used to convert the backlight passing through the quantum dot layer into polarized light with a wavelength greater than 460nm, and the photoluminescence conversion layer reduces
  • the wavelength of the backlight is converted into polarized light with a wavelength greater than 460nm, which can save the conventional lower polarizer and improve the utilization rate of the backlight and the transmittance of the display device.
  • the present invention also provides a method for manufacturing a liquid crystal display device, which can omit the lower polarizer and improve the utilization rate of the backlight and the transmittance of the display device.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Abstract

La présente invention concerne un dispositif d'affichage à cristaux liquides et son procédé de fabrication. Le dispositif d'affichage à cristaux liquides comprend un module de rétroéclairage (1), une couche de points quantiques (3) sur le côté d'émission de lumière du module de rétroéclairage (1), une couche de conversion de photoluminescence (4) disposée sur le côté de la couche de points quantiques (3) à distance du module de rétroéclairage (1), un écran d'affichage à cristaux liquides (2) disposé sur le côté de la couche de conversion de photoluminescence (4) à distance de la couche de points quantiques (3), et un polariseur (5) disposé sur le côté de l'écran d'affichage à cristaux liquides (2) à distance de la couche de conversion de photoluminescence (4). Le module de rétroéclairage (1) est utilisé pour émettre un rétroéclairage pour exciter la couche de points quantiques (3) pour émettre de la lumière. La couche de conversion de photoluminescence (4) est utilisée pour convertir le rétroéclairage traversant la couche de points quantiques (3) en une lumière polarisée ayant une longueur d'onde de 460 nm ou plus. La conversion de rétroéclairage à faible longueur d'onde en une lumière polarisée ayant une longueur d'onde de 460 nm ou plus par la couche de conversion de photoluminescence (4) peut économiser un polariseur inférieur couramment utilisé actuellement, et améliorer le taux d'utilisation de rétroéclairage et la transmissivité d'un dispositif d'affichage.
PCT/CN2019/083075 2019-03-26 2019-04-17 Dispositif d'affichage à cristaux liquides et son procédé de fabrication WO2020191832A1 (fr)

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CN201910234488.7A CN109917587B (zh) 2019-03-26 2019-03-26 液晶显示装置及其制作方法
CN201910234488.7 2019-03-26

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US11048122B1 (en) 2019-12-17 2021-06-29 Tcl China Star Optoelectronics Technology Co., Ltd. Liquid crystal display panel and liquid crystal display device
CN110941120A (zh) * 2019-12-17 2020-03-31 Tcl华星光电技术有限公司 一种液晶显示面板和液晶显示装置
CN111440401B (zh) * 2020-04-03 2021-07-23 Tcl华星光电技术有限公司 偏振发光材料及偏振发光层的制备方法

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