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WO2013189147A1 - Polariseur réfléchissant, son procédé de fabrication et dispositif d'affichage à cristaux liquides - Google Patents

Polariseur réfléchissant, son procédé de fabrication et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2013189147A1
WO2013189147A1 PCT/CN2012/084838 CN2012084838W WO2013189147A1 WO 2013189147 A1 WO2013189147 A1 WO 2013189147A1 CN 2012084838 W CN2012084838 W CN 2012084838W WO 2013189147 A1 WO2013189147 A1 WO 2013189147A1
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Prior art keywords
liquid crystal
chiral
organic solvent
photopolymerizable
substrate
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PCT/CN2012/084838
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English (en)
Chinese (zh)
Inventor
崔晓鹏
林鸿涛
封宾
马国靖
赵成明
Original Assignee
京东方科技集团股份有限公司
北京京东方显示技术有限公司
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Publication of WO2013189147A1 publication Critical patent/WO2013189147A1/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
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133543—Cholesteric polarisers

Definitions

  • Reflective polarizing plate Method for preparing reflective polarizing plate, and liquid crystal display device
  • the present disclosure relates to the field of liquid crystal display technology, and more particularly to a reflective polarizer, a method of preparing a reflective polarizer, and a liquid crystal display device. Background technique
  • a polarizing plate is an optical component that can convert natural light into polarized light and is an important component of liquid crystal displays.
  • a reflective polarizing plate made of a cholesteric liquid crystal enables the polarizing plate to have a function of selective reflection.
  • the reflection wave width of the reflection type polarizing plate is conventionally increased by adding a chiral compound to the cholesteric liquid crystal.
  • the chiral compound and the bile phase liquid crystal molecules have similar chemical structures and good molecular compatibility, the diffusion control is difficult, so the fabrication process is difficult to control, thus causing the reflection wavelength of the reflective polarizer. Still narrow. Summary of the invention
  • Embodiments of the present disclosure provide a reflective polarizing plate, a method of preparing a reflective polarizing plate, and a liquid crystal display device capable of performing optical compensation by heat treatment and light irradiation treatment of chiral discotic liquid crystal and bile phase liquid crystal. Reflective polarizer for performance and broadband reflection performance.
  • an embodiment of the present disclosure provides a reflective polarizer comprising: a first substrate; a first alignment film disposed on the first substrate; a chiral coating formed on the first alignment film, The chiral coating is prepared by coating a chiral discotic liquid crystal solution on a first alignment film, wherein the chiral discotic liquid crystal solution is at least composed of a photopolymerizable chiral disc liquid crystal monomer.
  • a photoinitiator and a thermal polymerization inhibitor are dissolved in the organic solvent; and the second substrate having the second alignment film disposed on the first substrate is disposed between the chiral coating and the second alignment film a spacer to form a gap; a bile-phase liquid crystal filled in the gap, wherein the bile phase liquid crystal is at least composed of nematic liquid crystal, photopolymerizable The nematic liquid crystal monomer, the chiral compound, the photoinitiator, and the thermal polymerization inhibitor are mixed.
  • an embodiment of the present disclosure provides a method of preparing a reflective polarizer, comprising: disposing a first alignment film on a first substrate; and applying a chiral disc liquid crystal solution to the first alignment film Forming a chiral coating, wherein the chiral discotic liquid crystal solution is obtained by dissolving at least a photopolymerizable chiral discotic liquid crystal monomer, a photoinitiator and a thermal polymerization inhibitor in an organic solvent; Forming a thin film device between the substrate and the second substrate provided with the second alignment film, and providing a spacer between the chiral coating and the second alignment film of the second substrate to form a gap; Liquid crystal is injected into the gap, wherein the cholesteric liquid crystal is obtained by mixing at least a nematic liquid crystal, a photopolymerizable nematic liquid crystal monomer, a chiral compound, a photoinitiator, and a thermal polymerization inhibitor; And light irradiation treatment
  • an embodiment of the present disclosure provides a liquid crystal display device including an array substrate, a color filter substrate disposed parallel to the array substrate and disposed on the array substrate, and disposed between the array substrate and the color filter substrate.
  • the liquid crystal layer further includes: a reflective polarizing plate having any of the above features disposed on the array substrate opposite to the liquid crystal layer and disposed on the color film substrate opposite to the liquid crystal layer.
  • the reflective polarizer provided by the embodiment of the present disclosure, the method for preparing the reflective polarizer, and the liquid crystal display device are prepared by applying a chiral discotic liquid crystal solution on the first alignment film to prepare a chiral coating.
  • the thin film device provided with the chiral coating and the gallium-phase liquid crystal is subjected to heat treatment and photo-irradiation treatment to form a reflective polarizing film.
  • the chiral discotic molecules in the chiral coating slowly diffuse in the cholesteric liquid crystal by heat treatment and photoirradiation treatment, and form a chiral discotic liquid crystal polymer network and nematic liquid crystal.
  • the monomer polymer network further increases the reflection wavelength of the cholesteric liquid crystal, thereby enabling the preparation of a reflective polarizer having both optical compensation performance and wide-band reflection performance, and increasing the reflection polarization in the prior art.
  • FIG. 1 is a schematic structural view of a reflective polarizer according to an embodiment of the present disclosure
  • FIG. 2 is a schematic flow chart of a method for preparing a reflective polarizing plate according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural view showing a state in a process of preparing a reflective polarizing plate according to an embodiment of the present disclosure
  • FIG. 4 is a schematic structural view of a second state in a process of preparing a reflective polarizer according to an embodiment of the present disclosure
  • FIG. 5 is a schematic structural view of a photopolymerizable chiral discotic liquid crystal cell according to an embodiment of the present disclosure
  • FIG. 6 is a schematic structural view showing a third state in a preparation process of a reflective polarizing plate according to an embodiment of the present disclosure
  • FIG. 7 is a schematic structural view showing a fourth state in the process of preparing a reflective polarizing plate according to an embodiment of the present disclosure
  • FIG. 8 is a schematic view showing the molecular structure of a photopolymerizable nematic liquid crystal monomer according to an embodiment of the present disclosure
  • FIG. 9 is a schematic view showing the molecular structure of a chiral compound R811 according to an embodiment of the present disclosure
  • FIG. 10 is a schematic view showing the molecular structure of a photoinitiator 1651 according to an embodiment of the present disclosure
  • FIG. 11 is a reflection spectrum of a reflective polarizing plate according to an embodiment of the present disclosure.
  • FIG. 12 is a graph showing a phase retardation curve of a chiral liquid crystal molecule according to an embodiment of the present disclosure. detailed description
  • the embodiment of the present disclosure provides a reflective polarizing plate 1, as shown in FIG. 1, comprising: a first substrate 10; a first alignment film 11 disposed on the first substrate 10; and a hand formed on the first alignment film 11.
  • the characterization coating 12 wherein the chiral coating 12 is prepared by coating a chiral discotic liquid crystal solution on the first alignment film 11, wherein the chiral discotic liquid crystal solution is at least soluble in organic a photopolymerizable chiral discotic liquid crystal monomer of a solvent, a photoinitiator and a thermal polymerization inhibitor; a second substrate 16 having a second alignment film 15 disposed on the first substrate 10, wherein the chiral coating A spacer 13 is disposed between the layer 12 and the second alignment film 15 to form a gap; a cholesteric liquid crystal 14 filled in the gap, wherein the cholesteric liquid crystal 14 is volatilized by a bile phase liquid crystal solution,
  • the bile phase liquid crystal solution includes at least an organic solvent, a nematic liquid crystal, a photopolymerizable nematic liquid crystal monomer, a chiral compound, a photoinitiator, and a thermal polymerization inhibitor.
  • the chiral discotic liquid crystal solution comprises at least a photopolymerizable chiral discotic liquid crystal monomer to which an organic solvent is added, a photoinitiator in a weight percentage of 0.1 to 10 weight percent, and a weight percentage of 0.01. To a thermal polymerization inhibitor of weight percentage 10.
  • the weight percentage of a substance means: a substance occupies the weight ratio of the whole solution, that is, the weight of the whole solution is B, and the weight of a substance contained in the solution is A, then the weight percentage of the substance is 100*A /B.
  • a photoinitiator having a weight percentage of 0.1 to 10 weight percent means that the weight percentage of the photoinitiator to the chiral discotic liquid crystal solution is between 0.1 and 10, that is, the photoinitiator is in the chiral discotic liquid crystal.
  • the ratio in the solution is between 0.1% and 10% and contains the boundary value (0.1%, 10%).
  • the weight ratio of the photopolymerizable chiral discotic liquid crystal monomer to the organic solvent is 1:19.
  • the photopolymerizable chiral discotic liquid crystal monomer molecule is a symmetric type formed by a photopolymerization branch and a chiral branch by an acid bond, an ester bond, an amide bond or a carbonate bond.
  • an asymmetric discotic liquid crystal molecule is selected from the group consisting of pyrogallol, pyridazine, anthracene, benzophenanthrene, trimeric fluorene, hexaacetylene benzene, and hexabenzopyrene; photopolymerizable branch
  • the terminal group is selected from the group consisting of acrylates, mercapto acrylates, styrenes, diacetyls, or a mixture of two or more, and the chiral branched end groups are selected from the group consisting of octanol and isova. Any one or a mixture of two or more of alcohol, cholesterol, and menthol.
  • the number of photopolymerizable branches may be 1-5; the number of chiral branches may be 1-5.
  • the mixing of two or more means that the photopolymerizable branches and the chiral branches in a photopolymerizable chiral discotic liquid crystal monomer molecule may be different, and further, each photopolymerizable branch End
  • the base and chiral branched end groups may also be different.
  • the first photopolymerizable chiral discotic liquid crystal monomer molecule comprises three photopolymerizable branched end groups
  • the first photopolymerizable branched end group may be an acrylate type
  • the second The photopolymerized branched end group may be the same as or different from the first photopolymerizable branched end group
  • the third photopolymerizable branched end group may be identical to the first photopolymerizable branched end group and/or
  • the two photopolymerizable branched end groups are the same or different.
  • the cholesteric liquid crystal solution comprises: an organic solvent, a nematic liquid crystal dissolved in the organic solvent, and a photopolymerizable amount of 0.1 to 30% by weight in the organic solvent.
  • the thermal solvent is from 0.01 to 10% by weight of the organic solvent.
  • the cholesteric liquid crystal solution comprises: an organic solvent, a nematic liquid crystal having a weight percentage of 64.8 dissolved in the organic solvent, and a photopolymerizable weight of 15.0 dissolved in the organic solvent.
  • the weight percentage of a substance herein means: the weight ratio of a substance to the whole solution, that is, the weight of the whole solution is B, and the weight of a substance contained in the solution is A, then the weight percentage of the substance is 100*A/B.
  • a nematic liquid crystal having a weight percentage of 64.8 means that the weight percentage of the nematic liquid crystal and the cholesteric liquid crystal solution is 64.8, that is, the ratio of the nematic liquid crystal in the cholesteric liquid crystal solution is 64.8.
  • the photopolymerizable nematic liquid crystal monomer is selected from any one or a mixture of two or more of an acrylate, a mercapto acrylate, a styrene group, and a diacetyl group.
  • the chiral compound is selected from the group consisting of R811 (benzoic acid, 4-hexyloxy, 4-[[[(1R)-1-indolylheptyl]oxy]carbonyl]phenyl), S811 ( Benzoic acid, 4-hexyloxy, 4-[[[( IS ) -1-decylheptyl]oxy]carbonyl]phenyl ester;), CB15( ( + )-4, -( 2 fluorenyl) Butyl)-4-biphenyl cyanide, ZLI4572 (benzoic acid, 4-(p--4-pentylcyclohexyl), (1R)-1-phenyl-1,2-ethanedi-decyl) Any one or a mixture of two or more.
  • R811 benzoic acid, 4-hexyloxy, 4-[[[(1R)-1-indolylheptyl]oxy]carbonyl]phenyl
  • the photoinitiator is selected from the group consisting of dibenzoyl peroxide, dodecyl peroxide, azobisisobutyronitrile, diisopropyl peroxydicarbonate, dicyclohexyl peroxydicarbonate.
  • the thermal polymerization inhibitor is hydroquinone, p-benzoquinone, 2-tert-butyl hydroquinone, 2, 5-di-tert-butyl hydroquinone Any of them.
  • the organic solvent is selected from the group consisting of ethanol, acetone, dichlorodecane, trichlorodecane, carbon tetrachloride, tetrahydrofuran, isopropanol, cyclohexane, benzene, toluene, and diphenylbenzene.
  • ethanol acetone
  • dichlorodecane trichlorodecane
  • carbon tetrachloride tetrahydrofuran
  • isopropanol cyclohexane
  • benzene toluene
  • diphenylbenzene diphenylbenzene.
  • the spacer 13 is a glass microsphere having a diameter of from 10 micrometers to 300 micrometers. It should be noted that the embodiment of the present disclosure does not limit the arrangement of the spacers, and may be uniformly distributed between the chiral coating and the second alignment film of the second substrate, or may be only in chirality. The coating is disposed along the edge of the polarizing plate with the second alignment film of the second substrate.
  • the material of the first alignment film 11 or the second alignment film 15 is polyimide.
  • the chiral discotic molecules in the chiral coating 12 are directed to the cholesteric liquid crystal 14 due to heat treatment and light irradiation treatment.
  • the diffuse diffusion slowly forms a nematic liquid crystal monomer polymer network 17 and a chiral discotic liquid crystal polymer network 18, thereby increasing the reflected wave width of the cholesteric liquid crystal 14.
  • the chiral discotic liquid crystal has a light-compensating reflective polarizing plate provided by the embodiment of the present disclosure
  • a chiral coating is formed on the first substrate provided with the first alignment film, and is parallel to the first substrate
  • a bile phase liquid crystal is disposed between the second substrate having the second alignment film and the chiral coating disposed on the chiral coating pair.
  • the heat treatment and the photoirradiation treatment are performed after the bile phase liquid crystal is injected into the gap, the chiral discotic molecules slowly diffuse toward the cholesteric liquid crystal, and form a chiral discotic liquid crystal polymer.
  • the network and the nematic liquid crystal monomer polymer network further increase the reflection wavelength of the cholesteric liquid crystal.
  • the reflective polarizer has both optical compensation performance and wide-band reflection performance.
  • a method for preparing a reflective polarizer provided by an embodiment of the present disclosure, as shown in FIG. 2, includes the following steps:
  • a first alignment film is disposed on the first substrate.
  • a first alignment film 11 is disposed on the first substrate 10.
  • the material of the first alignment film 11 used in the embodiment of the present disclosure is polyimide, which enables coating on the poly
  • the liquid crystal molecules of the imide oriented film are oriented parallel to the array substrate.
  • a chiral discotic liquid crystal solution is obtained by dissolving at least an organic solvent in a photopolymerizable chiral discotic liquid crystal monomer, a photoinitiator and a thermal inhibitor.
  • the chiral discotic liquid crystal solution is applied to the first On the alignment film 11, wherein the chiral discotic liquid crystal solution is obtained by dissolving at least an organic solvent in a photopolymerizable chiral discotic liquid crystal monomer, a photoinitiator, and a thermal polymerization inhibitor.
  • a method of preparing a chiral discotic liquid crystal solution includes:
  • the photopolymerizable chiral discotic liquid crystal monomer is dissolved in an organic solvent, and the photopolymerizable chiral disc-shaped liquid crystal monomer is a substance having a discotic liquid crystal intermediate phase;
  • a photoinitiator having a weight percentage of 0.1 to 10% by weight and a thermal polymerization inhibitor having a weight percentage of 0.01 to 10% by weight are added to the organic solvent;
  • the organic solvent of the photopolymerizable chiral discotic liquid crystal monomer, photoinitiator and thermal polymerization inhibitor is stirred and mixed for 1 minute to 60 minutes to prepare a chiral discotic liquid crystal solution.
  • the method of preparing the chiral discotic liquid crystal solution may be:
  • the photopolymerizable chiral discotic liquid crystal monomer is dissolved in a tetrahydrofuran solvent in a ratio of 1:19; a photoinitiator having a weight percentage of 0.1 to 10% by weight and a thermal resistance of 0.01 to 10% by weight Adding a monomer to the tetrahydrofuran solvent;
  • the tetrahydrofuran solvent was stirred for 30 minutes under a sealed condition to prepare a chiral discotic liquid crystal solution of 5 parts by weight.
  • the molecular structure of the photopolymerizable chiral discotic liquid crystal monomer is a symmetric or non-formation formed by an acid bond, an ester bond, an amide bond or a carbonate bond, and a photopolymerizable branch and a chiral branch.
  • the disc core of the photopolymerizable chiral discotic liquid crystal monomer molecule is selected from any one of pyrogallol, pyridazine, anthracene, triphenylene, trimeric anthracene, hexaacetylenebenzene, and hexabenzopyrene or a mixture of two or more kinds;
  • the photopolymerizable branched end group is selected from the group consisting of acrylates, mercapto acrylates, styrenes, diacetyls, or a mixture of two or more, photopolymerizable
  • the number of chains is 1-5;
  • the chiral branched end groups are selected from any one or a mixture of two or more of octanol, isoamyl alcohol, cholesterol, menthol, and the number of chiral branches is one. -5.
  • a TFT-LCD Thin Film Transistor-Liquid Crystal Display
  • uses an optical positive liquid crystal and when viewed at a large angle, a positive phase retardation occurs, resulting in a decrease in contrast and a decrease in viewing angle.
  • the discotic liquid crystal has an optical negative characteristic opposite to that of the optical positive liquid crystal, and has a negative phase retardation. This negative phase retardation can be used to compensate the positive phase retardation of the TFT-LCD, and thus the optically negative disc shape.
  • the liquid crystal material can be used to fabricate an optical compensation film of a TFT-LCD.
  • the chiral discotic liquid crystal of the present disclosure has optical compensation characteristics Learn the compensation characteristics.
  • FIG. 5 shows the structure of a photopolymerizable chiral discotic liquid crystal monomer molecule which is a symmetric discotic liquid crystal molecule having a molecular formula of tri-1 , 3 , 5-acryloyloxy Hexyloxybenzoic acid-tris-2,4,6-sec-octyloxybenzoic acid-benzophenanthrene ester.
  • the disk core is a commonly used benzophenanthrene
  • the three polymerizable branches are acryloyloxyhexyloxybenzoic acid, wherein the polymerizable branched end group is acrylic acid, and the three chiral branches are secondary octane oxygen.
  • Benzophthalic acid wherein the chiral branched end group is octanol.
  • the first substrate 10 and the second substrate 16 provided with the second alignment film 15 are paired to form a thin film device, and in the chiral coating 12 and A spacer 13 is disposed between the second alignment films 15 of the second substrate 16 to form a gap.
  • the first substrate 10 is placed in a box with the second substrate 16 having the second alignment film 15 disposed parallel to the first substrate 10 and disposed with the chiral coating 12, and in the chiral A spacer 13 is provided between the sexual coating 12 and the second alignment film 15 to form a gap.
  • the spacer 13 may be a glass bead having a diameter of 10 ⁇ m to 300 ⁇ m, and the material of the second alignment film 15 may also be a polyimide.
  • cholesteric liquid crystal 14 injecting a cholesteric liquid crystal 14 into the gap, wherein the cholesteric liquid crystal 14 is composed of at least a nematic liquid crystal, a photopolymerizable nematic liquid crystal monomer, a chiral compound, a photoinitiator, and a thermal polymerization inhibitor.
  • the cholesteric liquid crystal 14 is composed of at least a nematic liquid crystal, a photopolymerizable nematic liquid crystal monomer, a chiral compound, a photoinitiator, and a thermal polymerization inhibitor.
  • a spacer is disposed between the chiral coating 12 on the first substrate 10 in the thin film device and the second alignment film 15 on the second substrate 16 to form a gap, and then the cholesteric liquid crystal is injected into the gap formed.
  • the cholesteric liquid crystal is injected into the gap under vacuum, wherein the cholesteric liquid crystal exhibits orientation parallel to the array substrate due to the action of the second alignment film.
  • the cholesteric liquid crystal 14 is filled in the gap.
  • the cholesteric liquid crystal has a selective spiral structure because of its special helical structure.
  • the long axis of the liquid crystal molecules In the bile phase liquid crystal, the long axis of the liquid crystal molecules periodically rotates around a spiral axis to form a spiral structure.
  • the distance traveled by the long axis of liquid crystal molecules 360 is called the pitch P, the size and liquid of P
  • the content of chiral compounds in the crystal is inversely proportional.
  • the reflection wavelength of the single-pitch cholesteric liquid crystal ⁇ , where ⁇ is the birefringence of the liquid crystal material, respectively.
  • the left (right) rotated circularly polarized light is reflected by the left (right) rotating cholesteric liquid crystal, while the right (left) rotated circularly polarized light is transmitted; Outside the wide range, both left and right circularly polarized light are transmitted.
  • the bile phase liquid crystal can also be used as a reflective polarizer.
  • the visible light is reflected by the visible light to obtain circularly polarized light, which is then converted into linearly polarized light by a quarter wave plate, and can be directly used for a liquid crystal display.
  • the cholesteric liquid crystal of the embodiment of the present disclosure is obtained by mixing at least a nematic liquid crystal, a photopolymerizable nematic liquid crystal monomer, a chiral compound, a photoinitiator, and a thermal polymerization inhibitor.
  • a method of preparing a cholesteric liquid crystal includes:
  • the organic solvent is volatilized to prepare a cholesteric liquid crystal having a single pitch with a liquid crystal phase temperature in the range of 60 °C to 120 °C.
  • the method for preparing the cholesteric liquid crystal may be:
  • a nematic liquid crystal having a weight percentage of 64.8 a photopolymerizable nematic liquid crystal monomer having a weight percentage of 15.0, a chiral compound having a weight percentage of 14.8, a photoinitiator having a weight percentage of 4.4, and a heat of 1.0 by weight.
  • the polymerization inhibitor is dissolved in an organic solvent;
  • the solvent is volatilized to prepare a bile phase liquid crystal having a single pitch in a liquid crystal phase temperature in the range of 60 °C to 120 °C.
  • the photopolymerizable nematic liquid crystal monomer is any one or a mixture of two or more of an acrylate, a mercapto acrylate, a styrene group, and a diacetyl group;
  • the chiral compound is selected from any one or more of R811, S811, CB15, ZLI4572;
  • the photoinitiator is selected from the group consisting of dibenzoyl peroxide, dodecyl peroxide, azobisisobutyronitrile, diisopropyl peroxydicarbonate, and dicyclohexyl peroxydicarbonate;
  • the thermal polymerization inhibitor is selected from the group consisting of hydroquinone, p-benzoquinone, 2-tert-butyl hydroquinone, and 2, 5-di-tert-butyl hydroquinone;
  • the solvent is selected from the group consisting of ethanol, acetone, dichlorodecane, trichlorodecane, carbon tetrachloride, tetrahydrofuran, and different Any one of propanol, cyclohexane, benzene, toluene, and diphenyl.
  • Figure 8 shows the structure of a photopolymerizable nematic liquid crystal monomer C6M which is an acrylate photopolymerizable nematic liquid crystal having a molecular formula of 1, 4-bis(4-(6, -propyleneoxy) Oxyphenyl)benzoyloxy)-2-indenylbenzene, both photoactive functional groups are acrylates;
  • Figure 9 shows the molecular structure of the chiral compound R811, which has the formula: (benzoic acid, 4-hexyloxy, 4-[[[(l))-l-decylheptyl]oxy]carbonyl]phenyl));
  • Figure 10 shows the molecular structure of photoinitiator 1651 having the formula 2,2-dimethoxyoxy-phenylfluorenone.
  • nematic liquid crystal nematic liquid crystal
  • chiral compound photopolymerizable nematic liquid crystal monomer
  • photoinitiator photoinitiator
  • the thin film device is subjected to heat treatment and light irradiation treatment to form a reflective polarizing plate. After the cholesteric liquid crystal is injected into the gap of the thin film device, the thin film device is subjected to heat treatment and photoirradiation treatment to form a reflective polarizing plate.
  • the thin film device is subjected to heat treatment and light irradiation treatment, and the chiral discotic molecules slowly diffuse toward the bile phase liquid crystal 14 and form a chiral sign.
  • the discotic liquid crystal polymer network 17 and the nematic liquid crystal monomer polymer network 18 further increase the reflected wave width of the cholesteric liquid crystal 14.
  • the process of heat-treating and photo-irradiating the thin film device to form the reflective polarizer may include:
  • the film device is heated to a temperature ranging from 90 ° C to 120 ° C, preheated for 1 minute to 60 minutes, and subjected to ultraviolet irradiation polymerization crosslinking, wherein the ultraviolet irradiation time is 1 minute to 60 minutes, and the ultraviolet wavelength is 365 nm.
  • the irradiation dose was 0.001 mW per square centimeter to 100 mW per square centimeter to prepare a reflective polarizing plate.
  • the method of performing heat treatment and light irradiation treatment on the thin film device to form the reflective polarizing plate may be:
  • the thin film device was heated to 110 ° C, preheated for 30 minutes, and subjected to ultraviolet irradiation polymerization cross-linking, wherein the ultraviolet irradiation time was 30 minutes, the ultraviolet wavelength was 365 nm, and the irradiation dose was 10 mW per square centimeter.
  • chiral discotic molecules diffuse into the cholesteric liquid crystal and form a nematic liquid crystal monomer polymer network and a chiral discotic liquid crystal polymer network. This increases the reflection wavelength of the bile phase liquid crystal, thereby producing a reflective polarizer having both optical compensation performance and wide-band reflection performance.
  • Curve 1 of Fig. 11 shows a curve in which the reflectance of the prepared reflective polarizing plate which was prepared by preheating at 110 ° C for 30 minutes at a temperature of 25 ° C as a function of incident wavelength, and in Fig. 11, the horizontal axis was a reflection type. The reflection beam width of the polarizing plate, and the vertical axis is the reflectance of the reflective polarizing plate. As shown by the curve 1 in Fig. 11, the reflected circularly polarized light has a wavelength in the range of 400 to 700 nm and a reflection bandwidth of 300 nm. The curve of the reflectance of the next test as a function of the incident wavelength. As shown in Fig.
  • the reflection center is displaced, and the reflection wave width is gradually narrowed.
  • the wavelength of the reflected circularly polarized light is 420-680 nm, and the reflection bandwidth is 260 nm, which indicates that the preheating is performed.
  • the preheating time is different, which causes the chiral discoid molecules to diffuse slowly in the bile phase liquid crystal, which causes the reflection wave width of the reflective polarizer to change.
  • a chiral coating is separated to test the phase retardation value of the chiral liquid crystal molecules in the chiral coating.
  • Fig. 12 shows the phase retardation values of the chiral liquid crystal molecules of the chiral coating, wherein the horizontal axis represents the polarization angle and the vertical axis represents the phase retardation value.
  • the chiral liquid crystal molecules can still generate a phase retardation, that is, the chiral liquid crystal molecules are optically negative discotic liquid crystals having optical compensation characteristics, thereby demonstrating the preparation of the present disclosure.
  • the reflective polarizer has optical compensation characteristics.
  • a method for preparing a reflective polarizing plate provided by an embodiment of the present disclosure, by disposing a first alignment film on a first substrate, and dissolving a photopolymerizable chiral discotic liquid crystal monomer, a photoinitiator, and a thermal polymerization inhibitor
  • the chiral discotic liquid crystal solution obtained by the organic solvent is coated on the first alignment film to prepare a chiral coating layer, and the first substrate and the second substrate provided with the second alignment film are paired to form a thin film device.
  • a spacer between the chiral coating and the second alignment film of the second substrate to form a gap which is further caused by a nematic liquid crystal, a photopolymerizable nematic liquid crystal monomer, a chiral compound, and light.
  • the cholesteric liquid crystal obtained by mixing the agent and the thermal polymerization inhibitor is injected into the gap of the thin film device, and the thin film device is subjected to heat treatment and light irradiation treatment to form a reflective polarizing plate.
  • a reflective polarizer having both optical compensation performance and wide-band reflection performance can be prepared, which increases the reflection wavelength of the reflective polarizer in the prior art.
  • a liquid crystal display device includes an array substrate, a color filter substrate disposed parallel to the array substrate and disposed on the array substrate, and a liquid crystal layer disposed between the array substrate and the color filter substrate.
  • a reflective polarizing plate which is the same as the above embodiment and which is disposed on the opposite side of the liquid crystal layer on the array substrate and which is disposed on the color film substrate opposite to the liquid crystal layer.
  • the liquid crystal display device provided by the embodiment of the present disclosure may be a product or a component having a display function, such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone, a tablet computer, etc.; and the liquid crystal display device may apply the above reflective polarization
  • the structure of the reflective polarizer is the same as that of the above embodiment, and will not be described herein.

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

Abstract

La présente invention concerne un polariseur réfléchissant, son procédé de fabrication et un dispositif d'affichage à cristaux liquides. Le polariseur réfléchissant selon l'invention présente à la fois des performances de compensation optique et de réflexion à large bande. Ledit polariseur réfléchissant comprend un premier substrat, une première couche d'alignement qui est agencée sur le premier substrat, un revêtement chiral qui est formé sur la première couche d'alignement, un second substrat qui est agencé avec le premier substrat de manière à former une boîte et qui est muni d'une seconde couche d'alignement, et des cristaux liquides cholestériques qui remplissent un espace libre, le revêtement chiral étant formé par application d'un revêtement de solution de cristaux liquides discotiques chiraux sur la première couche d'alignement ; des espaceurs sont agencés entre le revêtement chiral et la seconde couche d'alignement en vue de former l'espace libre.
PCT/CN2012/084838 2012-06-20 2012-11-19 Polariseur réfléchissant, son procédé de fabrication et dispositif d'affichage à cristaux liquides WO2013189147A1 (fr)

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CN104155800B (zh) * 2014-07-11 2017-06-30 京东方科技集团股份有限公司 一种反射式液晶显示器
WO2017033468A1 (fr) 2015-08-27 2017-03-02 富士フイルム株式会社 Élément optique, procédé de fabrication d'un élément optique, et dispositif d'affichage à cristaux liquides
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CN109143711B (zh) * 2018-07-10 2022-02-22 宁波激智科技股份有限公司 一种透明防蓝光保护膜及其制备方法
CN109709704B (zh) * 2019-02-28 2022-11-11 京东方科技集团股份有限公司 调光玻璃及其制备方法
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