WO2015190711A1 - Couche d'alignement de cristaux liquides, élément d'affichage à cristaux liquides l'utilisant, et son procédé de fabrication - Google Patents

Couche d'alignement de cristaux liquides, élément d'affichage à cristaux liquides l'utilisant, et son procédé de fabrication Download PDF

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Publication number
WO2015190711A1
WO2015190711A1 PCT/KR2015/004781 KR2015004781W WO2015190711A1 WO 2015190711 A1 WO2015190711 A1 WO 2015190711A1 KR 2015004781 W KR2015004781 W KR 2015004781W WO 2015190711 A1 WO2015190711 A1 WO 2015190711A1
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WIPO (PCT)
Prior art keywords
liquid crystal
group
crystal display
acid
substrate
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PCT/KR2015/004781
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English (en)
Korean (ko)
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이준협
손인태
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명지대학교 산학협력단
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Publication of WO2015190711A1 publication Critical patent/WO2015190711A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
    • C09K19/54—Additives having no specific mesophase characterised by their chemical composition
    • C09K19/56—Aligning agents
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers

Definitions

  • the present invention relates to a liquid crystal alignment layer, a liquid crystal display device using the same, and a method for manufacturing the same. More particularly, a liquid crystal alignment layer capable of uniformly arranging liquid crystal molecules of a liquid crystal layer without a conventional polyimide alignment layer, and a liquid crystal display using the same. A device and a method of manufacturing the same.
  • a liquid crystal display is composed of a liquid crystal display panel displaying an image by using light transmittance of liquid crystal and a backlight assembly providing light.
  • the liquid crystal display panel generally includes a TFT array substrate, a color filter layer substrate facing the array substrate, and a liquid crystal layer interposed between the array substrate and the color filter layer substrate.
  • an alignment layer polymer layer is used to form an initial alignment of liquid crystal molecules in a state in which no voltage is supplied to the display device.
  • a polyimide-based polymer is mainly used, and a polymer solution is formed in a thin film form on each of the array and color filter layer substrates before liquid crystal injection and then formed through a heat treatment and baking process.
  • the conventional alignment layer process requires a separate thin film forming step before injecting the liquid crystal, and has a disadvantage in that it takes a complicated and time-consuming process through the multi-step drying and curing process when firing the thin film.
  • problems such as unevenness may occur due to thickness unevenness of the thin film.
  • the present invention provides a liquid crystal alignment layer that uniformly arranges the liquid crystal molecules of the liquid crystal layer without a conventional polyimide alignment layer.
  • the present invention provides a low-cost, high-speed response liquid crystal display device and a method of manufacturing the same, which can realize excellent display characteristics without a conventional polyimide alignment layer.
  • a TFT array substrate comprising: mixing an organic molecule and a liquid crystal represented by Formula 1 to produce an organic molecule liquid crystal mixture (step 1); Dropping the organic liquid crystal mixture on one surface of the array substrate or the color filter substrate (step 2); Bonding the two substrates so that the organic molecular liquid crystal mixture is positioned between the two substrates (step 3); And a step (step 4) of heat treating the bonded substrate and cooling to room temperature.
  • a is a functional group capable of hydrogen bonding
  • b is a cyclic compound
  • c is an alkyl group.
  • the organic molecules represented by Chemical Formula 1 may have a flexible alkyl group (part C) capable of interacting with the liquid crystal molecules of the liquid crystal layer at one end thereof, a hydrogen bonding unit (part a) bonded to the substrate at the other end thereof, and a center spacer. It may have a structure in which a rigid ring structure (part b) which provides stability of liquid crystal alignment is combined.
  • the organic molecule may include a functional group capable of forming a non-covalent bond with the substrate.
  • the non-covalent bond may be a hydrogen bond.
  • the alkyl group of the organic molecule may interact with the liquid crystal molecules of the liquid crystal layer to vertically align the liquid crystal molecules, and the functional group capable of hydrogen bonding may form a hydrogen bond with an ITO electrode or glass of the substrate to form a hydrogen bond. It can be fixed, and the ring structure can stabilize the liquid crystal alignment.
  • a is selected from the group consisting of a hydroxyl group, an amine group, a pyrimidine group and a carboxylic acid group,
  • the organic molecules may be mixed in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the liquid crystal. More preferably, it may be included in 0.1 to 0.5 parts by weight.
  • the initial liquid crystal alignment force is lowered, and light leakage occurs on a black screen.
  • the organic molecules are more than 10 parts by weight, the initial liquid crystal alignment force is too high, so that the response characteristics of the liquid crystal molecules are decreased when voltage is applied. Problems may arise.
  • the organic molecules are mixed in an amount of 0.1 to 0.5 parts by weight, the initial liquid crystal alignment force and the liquid crystal response characteristics during the electric field are optimized, thereby providing excellent black display characteristics and moving image response characteristics.
  • the coalescing may be performed by a sealant.
  • the heat treatment may be performed for 30 to 120 minutes at a temperature of 80 ⁇ 120 °C.
  • the organic molecules may be uniformly arranged over the substrate area, thereby manufacturing a liquid crystal display device in which screen smears due to uneven alignment do not occur.
  • a hydrogen bond may be formed between the organic molecule and the substrate.
  • step 3 the liquid crystal alignment layer for vertically or horizontally aligning the liquid crystal molecules with respect to the substrate by the organic molecules can be formed.
  • the organic molecule is 4- (4-heptylphenyl) benzoic acid (4- (4-heptylphenyl) benzoic acid), 4'-methyl-4-biphenylcarboxylic acid (4'-methyl-4-biphenylcarboxylic acid) , 4-n-octylbenzoic acid (4-n-octylbenzoic acid), p-toluic acid, 4-pentylphenol, 4-dodecylaniline (4-dodecylaniline) , 4-decylpyridine, trans-4-n-pentylcyclohexanecarboxylic acid, 4- (4-heptylcyclohexyl) benzoic acid (4- ( At least one selected from the group consisting of 4-heptylcyclohexyl) benzoic acid) and 4 '-(4-pentylcyclohexyl) biphenyl-4-carboxylic acid (4'-(4-pentylcyclo
  • a TFT array substrate Color filter substrates; And a liquid crystal layer interposed between the array substrate and the color substrate, wherein the liquid crystal alignment layer is formed between the liquid crystal layer and at least one substrate selected from the group consisting of the array substrate and the color filter substrate.
  • the liquid crystal alignment layer is formed of an organic molecule represented by Chemical Formula 1, wherein the liquid crystal alignment layer is bonded to a substrate by a non-covalent bond, and the organic molecules vertically or horizontally align the liquid crystal molecules in the liquid crystal layer.
  • a liquid crystal display device can be provided.
  • a is a functional group capable of hydrogen bonding
  • b is a cyclic compound
  • c is an alkyl group.
  • the organic molecules represented by Chemical Formula 1 may have a flexible alkyl group (part C) capable of interacting with the liquid crystal molecules of the liquid crystal layer at one end thereof, a hydrogen bonding unit (part a) bonded to the substrate at the other end thereof, and a center spacer. It may have a structure in which a rigid ring structure (part b) which provides stability of liquid crystal alignment is combined.
  • a is selected from the group consisting of a hydroxyl group, an amine group, a pyrimidine group and a carboxylic acid group,
  • the organic molecule is 4- (4-heptylphenyl) benzoic acid (4- (4-heptylphenyl) benzoic acid), 4'-methyl-4-biphenylcarboxylic acid (4'-methyl-4-biphenylcarboxylic acid) , 4-n-octylbenzoic acid (4-n-octylbenzoic acid), p-toluic acid, 4-pentylphenol, 4-dodecylaniline (4-dodecylaniline) , 4-decylpyridine, trans-4-n-pentylcyclohexanecarboxylic acid, 4- (4-heptylcyclohexyl) benzoic acid (4- (4-heptylcyclohexyl) benzoic acid) and 4 '-(4-pentylcyclohexyl) biphenyl-4-carboxylic acid (4'-(4-pentylcyclohexyl) biphenyl-4
  • the non-covalent bond may be a hydrogen bond.
  • a liquid crystal alignment layer used in the liquid crystal display device consisting of organic molecules represented by the following formula (1), the organic molecules are bonded to an adjacent substrate by a non-covalent bond, the organic molecules are vertical liquid crystal molecules Orientation or horizontal alignment can provide the liquid crystal aligning layer characterized by the above-mentioned.
  • a is a functional group capable of hydrogen bonding
  • b is a cyclic compound
  • c is an alkyl group.
  • the organic molecules represented by Chemical Formula 1 may have a flexible alkyl group (part C) capable of interacting with the liquid crystal molecules of the liquid crystal layer at one end thereof, a hydrogen bonding unit (part a) bonded to the substrate at the other end thereof, and a center spacer. It may have a structure in which a rigid ring structure (part b) which provides stability of liquid crystal alignment is combined.
  • a is selected from the group consisting of a hydroxyl group, an amine group, a pyrimidine group and a carboxylic acid group,
  • the organic molecule is 4- (4-heptylphenyl) benzoic acid (4- (4-heptylphenyl) benzoic acid), 4'-methyl-4-biphenylcarboxylic acid (4'-methyl-4-biphenylcarboxylic acid) , 4-n-octylbenzoic acid (4-n-octylbenzoic acid), p-toluic acid, 4-pentylphenol, 4-dodecylaniline (4-dodecylaniline) , 4-decylpyridine, trans-4-n-pentylcyclohexanecarboxylic acid, 4- (4-heptylcyclohexyl) benzoic acid (4- (4-heptylcyclohexyl) benzoic acid) and 4 '-(4-pentylcyclohexyl) biphenyl-4-carboxylic acid (4'-(4-pentylcyclohexyl) biphenyl-4
  • the non-covalent bond may be a hydrogen bond.
  • liquid crystal molecules can be uniformly arranged without a conventional polyimide alignment layer and excellent electro-optic characteristics can be realized.
  • FIG. 1 is a schematic diagram of a liquid crystal display device according to an exemplary embodiment of the present invention.
  • FIG. 2 is a result of analyzing a black screen degree of a liquid crystal display device (Example 1 and Comparative Example), which is not applied with a backlight, by using a DSLR camera.
  • Example 3 is a graph showing transmittance curves according to voltages of liquid crystal display devices according to Example 1 and Comparative Examples.
  • Example 4 is a graph showing the results of measuring the liquid crystal reaction rate of the liquid crystal display device according to Example 1 and Comparative Example.
  • Example 5 is a result of analyzing the black screen degree of the liquid crystal display (Example 2 and Comparative Example) that is not applied voltage while the backlight is turned on using a DSLR camera.
  • Example 6 is a graph showing transmittance curves according to voltages of liquid crystal display devices according to Example 2 and Comparative Examples.
  • Example 7 is a graph showing the results of measuring the liquid crystal reaction rate of the liquid crystal display device according to Example 2 and Comparative Example.
  • the liquid crystal display device 100 of the present invention will be described with reference to FIG. 1.
  • the liquid crystal display device 100 includes a liquid crystal layer between the color filter substrate 110 and the TFT array substrate 120.
  • a liquid crystal alignment layer made of organic molecules 140 is formed between the liquid crystal layer 130 and the substrates 110 and 120 of the liquid crystal display device 100.
  • the organic molecule 140 has a flexible alkyl group 143 which interacts with the liquid crystal 130 of the liquid crystal layer at one end thereof, a hydrogen bonding unit 141 which bonds with the substrate at the other end thereof, and a liquid crystal alignment at the center spacer thereof.
  • Rigid ring structure 142 is combined to impart stability.
  • the alkyl group 143 of the organic molecule 140 interacts with the liquid crystal molecules of the liquid crystal layer to vertically align the liquid crystal molecules, and the hydrogen bonding unit 141 hydrogen bonds with the ITO electrode or glass of the substrate to form an organic molecule. And fixed to the substrate, the ring structure 142 stabilizes the liquid crystal alignment.
  • a non-covalent organic molecule 4- (4-heptylphenyl) benzoic acid (4- (4-heptylphenyl) benzoic acid), was added to a host liquid crystal having a dielectric constant anisotropy ( ⁇ ) of -3.3. At this time, the organic molecules were added 0.1 part by weight based on 100 parts by weight of the liquid crystal. Then, the mixture was stirred at 70 ° C. for about 10 minutes to allow the organic molecules to be completely dissolved in the host liquid crystal and mixed. In the mixing method, the organic molecules are preferably added in an amount of 0.01 to 10 parts by weight, and more preferably 0.1 to 0.5 parts by weight, based on 100 parts by weight of the liquid crystal.
  • the organic molecule liquid crystal mixture was evenly dropped on the lower TFT array substrate having the pixel electrode ITO or the upper color filter substrate having the common ITO, and the two substrates were bonded together using a sealant.
  • the liquid crystal display cell is heat-treated in a high temperature oven at 100 ° C. for about 1 hour and then cooled to room temperature to allow organic molecules to undergo non-covalent hydrogen bonding with the substrate, and at the same time, the liquid crystal molecules are oriented vertically by the organic molecules.
  • a liquid crystal display device was manufactured by forming a liquid crystal alignment layer.
  • the organic molecule liquid crystal mixture was evenly dropped on the lower TFT array substrate having the pixel electrode ITO or the upper color filter substrate having the common ITO, and the two substrates were bonded together using a sealant.
  • the liquid crystal display cell is heat-treated in a high temperature oven at 100 ° C. for about 1 hour and then cooled to room temperature to allow organic molecules to undergo non-covalent hydrogen bonding with the substrate, and at the same time, the liquid crystal molecules are oriented vertically by the organic molecules.
  • a liquid crystal display device was manufactured by forming a liquid crystal alignment layer.
  • the orientation force and the electro-optical characteristics of the liquid crystal display device according to Example 1 were measured. First, as a result of comparing black display degree at OV in which no voltage was applied to the liquid crystal element, the liquid crystal display cell according to Example 1 was vertically aligned to the same level as the liquid crystal display cell (comparative example) to which the existing polyimide alignment layer was applied. And black screen without light leakage (see FIG. 2).
  • the liquid crystal display cell according to Example 1 exhibited V-T characteristics similar to those of a conventional cell (comparative example), and it was confirmed that gray scale expression according to voltage was possible.
  • the liquid crystal response time (response time) of the liquid crystal display device was measured and the results are shown in FIG. 4.
  • the rising time (toning time) was 16 ms
  • the falling time (falling time, Toff) was 6 ms
  • the rising time was 24 ms.
  • the polling time was 6 ms. Therefore, it can be seen that a high-speed liquid crystal reaction speed equivalent to that of the existing liquid crystal device can be realized.
  • the alignment force and electro-optical characteristics of the liquid crystal display device according to Example 2 were measured. First, as a result of comparing black display degree at OV in which no voltage was applied to the liquid crystal device, the liquid crystal display cell according to Example 2 was vertical to the same level as the liquid crystal display cell (comparative example) to which the existing polyimide alignment layer was applied. It showed the orientation and implemented a black screen without light leakage as a whole (see FIG. 5).
  • the liquid crystal display cell according to Example 2 exhibited V-T characteristics similar to those of conventional cells (conventional), and thus, gray scales were expressed according to voltage.
  • the response time of the liquid crystal display (response time) of the liquid crystal display device was measured and the results are shown in FIG. 7.
  • the rising time was 32 ms and the polling time was 6 ms.
  • the polling time was 6 ms.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mathematical Physics (AREA)
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Abstract

Cette invention concerne une couche d'alignement de cristaux liquides et un procédé de fabrication d'un élément d'affichage à cristaux liquides l'utilisant et, plus particulièrement, une couche d'alignement de cristaux liquides, qui peut agencer de manière uniforme les molécules cristallines liquides d'une couche de cristaux liquides sans aucun film d'alignement en polyimide existant, et un procédé de fabrication d'un élément d'affichage à cristaux liquides l'utilisant. Cette invention peut agencer de manière uniforme les molécules cristallines liquides d'une couche de cristaux liquides sans aucun film d'alignement en polyimide existant et peut mettre en œuvre d'excellentes caractéristiques électro-optiques.
PCT/KR2015/004781 2014-06-10 2015-05-13 Couche d'alignement de cristaux liquides, élément d'affichage à cristaux liquides l'utilisant, et son procédé de fabrication WO2015190711A1 (fr)

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KR1020140070335A KR101607479B1 (ko) 2014-06-10 2014-06-10 액정 배향층, 이를 이용한 액정표시소자 및 이의 제조방법
KR10-2014-0070335 2014-06-10

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN108873535A (zh) * 2018-05-31 2018-11-23 友达光电股份有限公司 液晶显示面板

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KR102637055B1 (ko) 2016-08-09 2024-02-15 삼성디스플레이 주식회사 액정 표시 장치 및 그 제조 방법

Citations (4)

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US3848966A (en) * 1973-10-15 1974-11-19 Gen Motors Corp Homeotropic alignment additive for liquid crystals
KR20130110172A (ko) * 2010-09-25 2013-10-08 메르크 파텐트 게엠베하 호메오트로픽 정렬을 갖는 액정 디스플레이 및 액정 매질
KR20140045535A (ko) * 2011-07-07 2014-04-16 메르크 파텐트 게엠베하 액정 매질
KR20140047589A (ko) * 2011-02-05 2014-04-22 메르크 파텐트 게엠베하 호메오트로픽 정렬을 갖는 액정 디스플레이

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JP4274713B2 (ja) 2001-09-11 2009-06-10 シャープ株式会社 液晶表示装置および光学素子、並びにこれらの製造方法
KR101046926B1 (ko) 2004-08-12 2011-07-06 삼성전자주식회사 액정표시장치의 액정 배향막용 조성물
KR100782436B1 (ko) 2005-12-30 2007-12-05 제일모직주식회사 액정 배향제

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3848966A (en) * 1973-10-15 1974-11-19 Gen Motors Corp Homeotropic alignment additive for liquid crystals
KR20130110172A (ko) * 2010-09-25 2013-10-08 메르크 파텐트 게엠베하 호메오트로픽 정렬을 갖는 액정 디스플레이 및 액정 매질
KR20140047589A (ko) * 2011-02-05 2014-04-22 메르크 파텐트 게엠베하 호메오트로픽 정렬을 갖는 액정 디스플레이
KR20140045535A (ko) * 2011-07-07 2014-04-16 메르크 파텐트 게엠베하 액정 매질

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108873535A (zh) * 2018-05-31 2018-11-23 友达光电股份有限公司 液晶显示面板
CN108873535B (zh) * 2018-05-31 2021-07-06 友达光电股份有限公司 液晶显示面板

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