KR20090072871A - Alignment layer for liquid crystal display and light aligning method thereof - Google Patents

Alignment layer for liquid crystal display and light aligning method thereof Download PDF

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KR20090072871A
KR20090072871A KR1020070141116A KR20070141116A KR20090072871A KR 20090072871 A KR20090072871 A KR 20090072871A KR 1020070141116 A KR1020070141116 A KR 1020070141116A KR 20070141116 A KR20070141116 A KR 20070141116A KR 20090072871 A KR20090072871 A KR 20090072871A
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layer
sensitivity material
alignment
liquid crystal
crystal display
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KR101396108B1 (en
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우정원
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엘지디스플레이 주식회사
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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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
    • G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
    • 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
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0257—Reduction of after-image effects

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  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)
  • Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)

Abstract

An alignment layer and a photo-induced method for setting up the pre-tilt of a liquid crystal molecule in a liquid crystal display are provided to improve the reliability of photo-induced treatment by stabilizing the bulk layer of an organic alignment layer. An alignment layer(22) includes a surface layer having the high photosensitivity and a bulk layer having the photosensitivity lower than the surface layer. The surface layer includes the high sensitivity material capable of photodecomposition. The bulk layer is positioned between the surface layer and substrate. The bulk layer includes the reduction in which the photolysis is doubtful than the high sensitivity material and the surface energy is greater than the high sensitivity material is material.

Description

액정표시장치의 배향막과 그 광 배향방법{Alignment layer for Liquid Crystal Display and Light Aligning Method thereof}Alignment layer for liquid crystal display and light alignment method

본 발명은 액정표시장치에서 액정분자들의 프리틸트를 설정하기 위한 배향막과 그 광 배향방법에 관한 것이다. The present invention relates to an alignment film for setting the pretilt of liquid crystal molecules in a liquid crystal display device and a light alignment method thereof.

액티브 매트릭스(Active Matrix) 구동방식의 액정표시장치는 스위칭 소자로서 박막트랜지스터(Thin Film Transistor : 이하 "TFT"라 함)를 이용하여 화상을 표시하고 있다. 이 액정표시장치는 음극선관(Cathode Ray Tube, CRT)에 비하여 소형화가 가능하여 휴대용 정보기기, 사무기기, 컴퓨터 등에서 표시기에 응용됨은 물론, 텔레비젼에도 응용되어 빠르게 음극선관을 대체하고 있다. An active matrix liquid crystal display device displays an image using a thin film transistor (hereinafter, referred to as TFT) as a switching element. The liquid crystal display device can be miniaturized compared to a cathode ray tube (CRT), which is applied to a display device in portable information equipment, office equipment, computer, etc., and is also rapidly replaced by a cathode ray tube.

액정표시장치의 제조공정에서, 배향막의 제조공정은 폴리이미드 등의 유기막을 러빙포로 러빙하여 배향막을 형성한다. 이러한 러빙처리는 러빙포에 의한 오염 이 많고, 러빙에 의해 TFT, 컬러필터 등의 화소 어레이 소자들이형성된 기판에 정전기를 유발하여 소자에 데미지를 초래하고, 생산성을 떨어뜨리고 있다. In the manufacturing process of the liquid crystal display device, the manufacturing process of the alignment film forms an alignment film by rubbing an organic film such as polyimide with a rubbing cloth. Such rubbing treatments are highly polluted by rubbing cloths, and cause rubbing to cause static electricity to the substrate on which pixel array elements such as TFTs and color filters are formed by rubbing, resulting in damage to the elements, and reducing productivity.

이러한 러빙방법의 문제를 개선하기 위하여, 비접촉 액정 배향 기술이 제안되고 있고, 그 중 하나로 광배향 처리가 알려져 있다. 광배향 처리는 투명 기판 상에 형성된 유기 배향막에 편광 자외선을 조사하여 그 유기 배향막을 구성하는 분자에 자외선의 편광 방향에 따른 화학변화를 일으키게 해 그것에 의해 유기 배향막에 액정 배향의 방향성과 프리틸트각을 설정한다. 따라서, 광배향 처리는 러빙에 의한 오염이나 화소 어레이 소자에 대한 정전 데미지를 줄일 수 있고 또한 불량율을 낮추어 생산성을 높일 수 있다. In order to improve the problem of this rubbing method, the non-contact liquid crystal aligning technique is proposed, and the photo-alignment process is known as one of them. The photo-alignment treatment irradiates the organic alignment film formed on the transparent substrate with polarized ultraviolet light to cause a chemical change depending on the polarization direction of the ultraviolet rays to the molecules constituting the organic alignment film, thereby providing the organic alignment film with the orientation and pretilt angle of the liquid crystal alignment. Set it. Therefore, the photo-alignment process can reduce contamination due to rubbing or electrostatic damage to the pixel array element, and can increase productivity by lowering a defective rate.

그런데 광배향 처리는 많은 장점에도 불구하고 실용화되지 않고 있다. 광배향 처리를 한 유기 배향막이 형성된 액정표시장치에서 동일 화상을 장시간 표시하고 그 화상의 표시를 멈추어도 표시되었던 화상의 잔상이 남는다. 이러한 현상의 원인은 광배향 처리로 인하여 유기 배향막의 화학적, 물리적 결함이 초래되었기 때문이다. 이를 도 1을 결부하여 설명하면, 기판(11) 상에 폴리이미드(Polyimide) 계열의 1,2,3,4-시클로부탄테트라카르복실산 2무수물(Cyclobutane-1,2,3,4-tetracarboxylic dianhydride , CBDA)을 코팅하여 유기막(12)을 형성하고, 그 유기막에 편광 자외선(UV)을 조사하면 그 유기막의 표면 뿐만 아니라 그 아래의 벌크층(bulk)까지 UV 편광에 반응한다. CBDA는 광에 노출되면 광반응에 의해 분자 구조의 링이 깨지면서 그 구조가 변화된다. 이러한 CBDA의 화학적 변화에 의해, 유기막(12)의 표면은 배향 처리면이 되나 그 아래의 벌크층은 결함이 발생된다. 이러한 벌크층의 결함은 배향 처리면을 안정하게 지지하지 못하기 때문에 액정의 배향을 불균일하게 하고 잔상의 원인으로 작용한다. However, photo-alignment treatment has not been put to practical use despite its many advantages. In the liquid crystal display device in which the organic alignment film subjected to the photo-alignment process is formed, the same image is displayed for a long time and the image remaining after the image is displayed remains even when the image is stopped. The reason for this phenomenon is that the photo-alignment treatment caused chemical and physical defects of the organic alignment layer. Referring to FIG. 1, the polyimide-based 1,2,3,4-cyclobutanetetracarboxylic dianhydride (Cyclobutane-1,2,3,4-tetracarboxylic) on the substrate 11 is described. dianhydride (CBDA) is coated to form an organic film 12. When the organic film is irradiated with polarized ultraviolet (UV) light, not only the surface of the organic film but also the bulk layer below it reacts with UV polarization. When exposed to light, CBDA changes its structure by breaking the ring of molecular structure by photoreaction. Due to the chemical change of CBDA, the surface of the organic film 12 becomes an alignment treatment surface, but the bulk layer below it causes defects. Since the defect of the bulk layer does not stably support the alignment treatment surface, the alignment of the liquid crystal becomes uneven and acts as a cause of the afterimage.

따라서, 본 발명의 목적은 상기 종래 기술의 문제점들을 해결하고자 안출된 발명으로써 광배향 처리된 유기 배향막의 벌크층을 안정화하여 광 배향처리의 신뢰성을 향상시키도록 한 액정표시장치의 배향막과 그 광 배향방법을 제공하는데 있다. Accordingly, an object of the present invention is to solve the problems of the prior art, and to stabilize the bulk layer of the photoalignment-treated organic alignment layer to improve the reliability of the photoalignment process, the alignment layer of the liquid crystal display device and its optical alignment. To provide a method.

상기 목적을 달성하기 위하여, 본 발명의 실시예에 따른 액정표시장치의 배향막은 광분해가 가능한 고감도 재료를 포함한 표면층, 및 상기 표면층과 기판 사이에 위치하고 상기 고감도 재료보다 광분해가 어렵고 상기 고감도 재료보다 표면 에너지가 큰 저감도 재료를 포함한 벌크층을 포함한다. In order to achieve the above object, the alignment layer of the liquid crystal display according to the embodiment of the present invention is a surface layer including a high sensitivity material capable of photolysis, and located between the surface layer and the substrate is difficult to photolysis than the high sensitivity material and surface energy than the high sensitivity material It includes a bulk layer containing a large low sensitivity material.

본 발명의 실시예에 따른 액정표시장치의 배향막의 광 배향방법은 광분해가 가능한 고감도 재료와 상기 고감도 재료보다 광분해가 어렵고 상기 고감도 재료보다 표면 에너지가 큰 저감도 재료의 혼합용액을 기판 상에 코팅하는 단계; 상기 혼합용액을 건조시켜 상기 고감도 재료와 상기 저감도 재료의 층 분리를 유도하여 기판 상에 유기막을 형성하는 단계; 및 상기 유기막 상에 편광 자외선을 조사한다. The photo-alignment method of the alignment layer of the liquid crystal display device according to an embodiment of the present invention is to coat a mixed solution of a high sensitivity material capable of photolysis and a low sensitivity material that is difficult to photolysis than the high sensitivity material and has a surface energy greater than the high sensitivity material on a substrate. step; Drying the mixed solution to induce layer separation of the high sensitivity material and the low sensitivity material to form an organic film on a substrate; And polarized ultraviolet light is irradiated onto the organic layer.

본 발명의 실시예에 따른 액정표시장치의 배향막과 그 광 배향방법은 광분해가 쉽고 표면 에너지가 작은 고감도재료와 상대적으로 광분해가 어렵고 표면 에너지가 큰 저감도 재료를 혼합한 다음, 그 혼합용액을 건조하는 과정에서 고감도 재료와 저감도 재료의 층분리를 유도함으로써 유기 배향막의 벌크층을 안정화하여 광 배향처리의 신뢰성을 향상시킬 수 있다. The alignment layer of the liquid crystal display device and the optical alignment method according to the embodiment of the present invention are mixed with a high sensitivity material that is easy to decompose and has a low surface energy and a low sensitivity material that is relatively difficult to decompose and has a large surface energy, and then dry the mixed solution. By inducing the layer separation of the high sensitivity material and the low sensitivity material in the process of stabilizing the bulk layer of the organic alignment layer can improve the reliability of the photo alignment process.

이하, 도 2 내지 도 7을 참조하여 본 발명의 바람직한 실시예에 대하여 설명하기로 한다. Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 2 to 7.

도 5를 참조하면, 본 발명의 실시예에 따른 액정표시장치의 배향막(22)은 광감도가 높은 표면층(22A)과, 표면층(22A)에 비하여 광감도가 낮은 벌크층(22B)을 포함한다. Referring to FIG. 5, the alignment layer 22 of the liquid crystal display according to the exemplary embodiment of the present invention includes a surface layer 22A having high light sensitivity and a bulk layer 22B having low light sensitivity compared to the surface layer 22A.

표면층(22A)은 폴리이미드 계열의 재료 중에서 자외선에 노출될 때 분자구조의 링이 깨지기 쉽고 표면 에너지가 작은 광분해성 고감도 재료로 형성된다. 벌크층(22B)은 폴리이미드 계열의 재료 중에서 분자구조의 링이 안정화된 분자구조를 갖고 있어 자외선에 노출되더라도 광분해가 어렵고 표면 에너지가 큰 저감도 재료로 형성된다. The surface layer 22A is formed of a photodegradable high-sensitivity material having a small ring energy and a brittle ring of the molecular structure when exposed to ultraviolet rays among polyimide-based materials. The bulk layer 22B has a molecular structure in which the ring of the molecular structure is stabilized among polyimide-based materials, and thus, the bulk layer 22B is formed of a low-sensitivity material that is difficult to decompose even when exposed to ultraviolet rays and has a large surface energy.

배향막(22)에 자외선이 조사되면 표면층(22A)은 광분해가 되면서 배향처리되는 반면, 벌크층(22B)은 광분해가 미미하여 안정된 구조를 유지한다. When the alignment layer 22 is irradiated with ultraviolet rays, the surface layer 22A undergoes photolysis while being oriented, while the bulk layer 22B maintains a stable structure due to slight photolysis.

표면층(22A)의 재료는 광감도가 높은 폴리이미드 계열의 CBDA에 표면 에너지 가 작은 분자들이 결합된 재료들이다. 예를 들면, 표면층(22A)의 재료로는 도 3과 같이 광 감도가 높은 CBDA에 파라-페닐렌디아민(p-Phenylenediamine)이 결합된 사이클로부탄테트라카르복시디언하이드리드(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(1,4-aniline)]), CBDA에 디아미노디페닐메탄(4,4'-Diaminodiphenylmethane)이 결합된 사이클로부탄테트라카르복시디언하이드리드-메틸렌디아닐린(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(4,4'-methylenedianiline)]), CBDA에 아미노일라민(4'-amino[1,1'-biphenyl]-4-ylamine)이 결합된 사이클로부탄테트라카르복시디언하이드리드-바이페닐디아민(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(4,4'biphenyldiamine)]), CBDA에 옥시디아닐린(4,4'-Oxydianiline)이 결합된 사이클로부탄테트라카르복시디언하이드리드-옥시디아닐린(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(4,4'oxydianiline)]), CBDA에 디아미노벤조페논(4,4'-Diaminobenzophenone)이 결합된 사이클로부탄테트라카르복시디언하이드리드-바이페닐디아민(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(4,4'biphenyldiamine)], CBDA에 디아미노옥타플로러바이페닐(Diaminooctafluorobiphenyl)이 결합된 사이클로부탄테트라카르복시디언하이드리드-옥타플로러바이페닐디아민(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(2,2',3,3',5,5',6,6'-octafluoro-4,4'-biphenyldiamine)]), CBDA에 디아미노바이트리플로러바이페닐(Diamino-bitrifluoromethyl-biphenyl)이 결합된 사이클로부탄테트라카르복시디언하이드리드-디플로러메틸바이페 닐(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(2,2'trifluoromethyl-4,4'-biphenyl)]), CBDA에 디아미노디플로러바이페닐(Diaminodifluorobiphenyl)이 결합된 사이클로부탄테트라카르복시디언하이드리드-디플로러-바이페닐(Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(2,2'-difluoro-4,4'-biphenyl)]) 중에서 선택 가능하다. The material of the surface layer 22A is a material in which molecules having a small surface energy are bonded to a polyimide CBDA having high photosensitivity. For example, as a material of the surface layer 22A, cyclobutanetetracarboxylic dianhydride (P (Cyclobutanetetracarboxylic dianhydride) in which para-phenylenediamine is bonded to CBDA having high light sensitivity as shown in FIG. - alt - (1,4-aniline) ]), diaminodiphenyl methane in CBDA (4,4'-diaminodiphenylmethane) fitted with a cyclobutane tetracarboxylic carboxy Meridian hydride-methylenedianiline (Polyimide: [(Cyclobutanetetracarboxylic dianhydride) - alt - (4,4'-methylenedianiline) ]), the amino CBDA one suramin (4'-amino [1,1'-biphenyl ] -4-ylamine) fitted with a cyclobutane tetracarboxylic carboxy Meridian hydride-biphenyl diamine (Polyimide: [(Cyclobutanetetracarboxylic dianhydride) - alt - (4,4'biphenyldiamine)]), oxydianiline (4,4'-oxydianiline) fitted with a cyclobutane tetracarboxylic carboxy Meridian hydride in CBDA - oxydianiline ( Polyimide: [(Cyclobutanetetracarboxylic dianhydride) - alt - (4,4'oxydianiline)]), CBDA Diamino benzophenone (4,4'-Diaminobenzophenone) fitted with a cyclobutane tetracarboxylic carboxy Meridian hydride-biphenyl diamine (Polyimide: [(Cyclobutanetetracarboxylic dianhydride) - alt - (4,4'biphenyldiamine)], in dia mino CBDA octahydro peulroreo biphenyl diamine (Polyimide - octahydro peulroreo biphenyl fitted with a cyclobutane tetracarboxylic carboxy Meridian hydride (Diaminooctafluorobiphenyl): [(Cyclobutanetetracarboxylic dianhydride ) - alt - (2,2 ', 3,3', 5,5 ', 6,6'-octafluoro-4,4'-biphenyldiamine)]) and cyclobutanetetracarboxianhydride-difluoromethylbiphenyl with CBDA bound to diamino-bitrifluoromethyl-biphenyl (Polyimide: [(Cyclobutanetetracarboxylic dianhydride) - alt - (2,2'trifluoromethyl-4,4'-biphenyl)]), in CBDA diaminodiphenyl peulroreo the combined biphenyl (Diaminodifluorobiphenyl) cyclobutane tetracarboxylic carboxy Meridian hydride - Deployer-Biphenyl (Polyi) mide: [(Cyclobutanetetracarboxylic dianhydride) - (2,2'-difluoro-4,4'-biphenyl) - alt] is able to employ).

벌크층(22B)의 재료는 광감도가 낮고 표면에너지가 낮은 폴리이미드 계열 재료로 선택된다. 분자구조에서 링이 구조적으로 안정화되고 표면에너지가 낮은 폴리이미드계열의 재료로는 도 4와 같이 피로멜리틱디언하이드리드(Pyromellitic dianhydride) 또는, 도 5와 같은 사이클로헥산디언하이드리드(Cyclohexanedianhydride) 등이 있다. 도 4를 참조하면, 벌크층(22B)의 재료로는 피로멜리틱디언하이드리드(Pyromellitic dianhydride)에 파라페닐렌디아민(p-Phenylenediamine)이 결합된 피로멜리틱디언하이드리드-아닐린(Polyimide:[(pyromellitic dianhydride)-alt-(1,4-aniline)]), 피로멜리틱디언하이드리드(Pyromellitic dianhydride)에 디아미노페닐메탄(4,4'-Diaminodiphenylmethane)이 결합된 피로멜리틱디언하이드리드-메틸렌디아닐린(Polyimide:[(pyromellitic dianhydride)-alt-(4,4'-methylenedianiline)]), 피로멜리틱디언하이드리드(Pyromellitic dianhydride)에 아미노일라민(4'-amino[1,1'-biphenyl]-4-ylamine)이 결합된 피로멜리틱디언하이드리드-바이페닐디아민(Polyimide:[(pyromellitic dianhydride)-alt-(4,4'-biphenyldiamine)]), 피로멜리틱디언하이드리드(Pyromellitic dianhydride)에 옥시디아닐린(4,4'- Oxydianiline)이 결합된 피로멜리틱디언하이드리드-옥시디아닐린(Polyimide:[(pyromellitic dianhydride)-alt-(4,4'oxydianiline)]이 선택될 수 있다. 또한, 분자구조에서 링이 구조적으로 안정화되고 표면에너지가 낮은 폴리이미드계열의 재료로는 도 5와 같이 사이클로헥산디안하이드리드(Cyclohexanedianhydride)에 파라페닐렌디아민(p-Phenylenediamine)이 결합된 사이클로헥산테트라카르복시-아닐린(Polyimide:[(1,2,4,5-cyclohexanetetracarboxylic dianhydride dianhydride)-alt-(1,4-aniline)]), 사이클로헥산디안하이드리드(Cyclohexanedianhydride)에 디아미노디페닐메탄(4,4'-Diaminodiphenylmethane )이 결합된 사이클로헥산테트라카르복시-메틸렌디아닐린(Polyimide:[(1,2,4,5-cyclohexanetetracarboxylic dianhydride dianhydride)-alt-(4,4'-methylenedianiline)]), 사이클로헥산디안하이드리드(Cyclohexanedianhydride)에 아미노일라민(4'-amino[1,1'-biphenyl]-4-ylamine )이 결합된 사이클로헥산테트라카르복시-바이페닐디아민(Polyimide:[(1,2,4,5-cyclohexanetetracarboxylic dianhydride dianhydride)-alt-(4,4'-biphenyldiamine)]), 사이클로헥산디안하이드리드(Cyclohexanedianhydride)에 옥시디아닐린(4,4'-Oxydianiline)이 결합된 사이클로헥산테트라카르복시-옥시디아닐린(Polyimide:[(1,2,4,5-cyclohexanetetracarboxylic dianhydride)-alt-(4,4'-oxydianiline)])이 선택될 수 있다. The material of the bulk layer 22B is selected as a polyimide-based material having low light sensitivity and low surface energy. In the molecular structure, polyimide-based materials having a structurally stabilized ring and low surface energy include pyromellitic dianhydride as shown in FIG. 4, or cyclohexanedianhydride as shown in FIG. have. Referring to FIG. 4, the material of the bulk layer 22B is pyromellitic dianhydride-aniline (p-Phenylenediamine) coupled to pyromellitic dianhydride. (pyromellitic dianhydride) - alt - ( 1,4-aniline)]), pyromellitic Meridian hydride (pyromellitic dianhydride) to the diamino diphenyl methane (a 4,4'-Diaminodiphenylmethane) coupled pyromellitic Meridian hydride - methylenedianiline (Polyimide: [(pyromellitic dianhydride) - alt - (4,4'-methylenedianiline)]), pyromellitic Meridian amino days suramin (4'-amino [1,1'- the hydride (pyromellitic dianhydride) biphenyl] mellitic tick Meridian a hydride -4-ylamine) is coupled fatigue-biphenyl diamine (Polyimide: [(pyromellitic dianhydride) - alt - (4,4'-biphenyldiamine)]), pyromellitic Meridian hydride (pyromellitic dianhydride combined with oxydianiline (4,4'-Oxydianiline), pyromelliticdianhydride-oxydianiline (Polyimide: [(p yromellitic dianhydride) - alt -. ( 4,4'oxydianiline)] may be selected In addition, the material of the ring is stabilized by structural low surface energy polyimide series in the molecular structure as shown in FIG cyclohexane dianhydride Hyde the para-phenylenediamine (p-phenylenediamine) is coupled to the lead (Cyclohexanedianhydride) cyclohexane tetra-carboxy-aniline (Polyimide: [(1,2,4,5-cyclohexanetetracarboxylic dianhydride dianhydride) - alt - (1,4-aniline) ]), Cyclohexanetetracarboxylic-methylenedianiline with diaminodiphenylmethane (4,4'-Diaminodiphenylmethane) bonded to cyclohexanedianhydride (Polyimide: [(1,2,4,5-cyclohexanetetracarboxylic) dianhydride dianhydride) - alt - (a 4,4'-methylenedianiline)]), cyclohexane dianhydride hydride (Cyclohexanedianhydride) amino days suramin (4'-amino [1,1'-biphenyl ] -4-ylamine) coupled to Cyclohexanetetracarboxy-biphenyldiamine (Poly imide: [(1,2,4,5-cyclohexanetetracarboxylic dianhydride dianhydride) - alt - (4,4'-biphenyldiamine)]), oxydianiline (4,4'-Oxydianiline) in cyclohexane dianhydride hydride (Cyclohexanedianhydride) the combined cyclohexane tetra-carboxy-oxydianiline (Polyimide: [(1,2,4,5-cyclohexanetetracarboxylic dianhydride) - alt - (4,4'-oxydianiline)]) may be selected.

도 6은 표면층(22A)의 재료로 선택된 Polyimide:[(Cyclobutanetetracarboxylic dianhydride)-alt-(2,2'- trifluoromethyl-4,4'-biphenyl)]-co-[(Cyclobutanetetracarboxylic dianhydride)-alt-(1,4-aniline)]과, 벌크층(22B)의 재료로 선택된 Polyimide:[(1,2,4,5-cyclohexanetetracarboxylic dianhydride dianhydride)-alt-(4,4'-methylenedianiline)]-co-[(pyromellitic dianhydride)-alt-(4,4'-oxydianiline)]의 분자 구조를 보여 주는 도면이다. 6 is selected as the material of the surface layer (22A) Polyimide: [(Cyclobutanetetracarboxylic dianhydride) - alt - (2,2'- trifluoromethyl-4,4'-biphenyl)] - co - [(Cyclobutanetetracarboxylic dianhydride) - alt - (1 , 4-aniline)], and Polyimide material is selected as the bulk layer (22B): [(1,2,4,5- cyclohexanetetracarboxylic dianhydride dianhydride) - alt - (4,4'-methylenedianiline)] - co - [( a view showing the molecular structure of (4,4'-oxydianiline)] - pyromellitic dianhydride) - alt.

도 7은 본 발명의 실시예에 따른 배향막의 광배향방법을 보여 준다.7 shows a photoalignment method of an alignment layer according to an embodiment of the present invention.

도 7을 참조하면, 탱크 내에 표면층(22A)의 재료로 선택된 고감도 재료와 벌크층(22B)의 재료로 선택된 저감도 재료가 혼합된 용액을 저장한다. 이 탱크 내에서 고감도 재료와 저감도 재료는 임의로 섞여 있다. 이 혼합용액을 기판(21) 상에 코팅하고 대략 40℃~100℃ 정도의 온도에서 혼합용액을 건조하면, 그 건조과정에서 표면 에너지가 큰 저감도 재료는 표면 에너지가 낮은 고감도 재료 아래에 배치되어 저감도 재료와 고감도 재료의 층이 분리되며 또한, 휘발성 용매들이 증발한다. Referring to FIG. 7, a solution containing a mixture of a high sensitivity material selected as the material of the surface layer 22A and a low sensitivity material selected as the material of the bulk layer 22B is stored in the tank. In this tank, a high sensitivity material and a low sensitivity material are mixed arbitrarily. When the mixed solution is coated on the substrate 21 and the mixed solution is dried at a temperature of about 40 ° C. to 100 ° C., a low-sensitivity material having a large surface energy is disposed under a high-sensitivity material having a low surface energy during the drying process. The layers of low and high sensitivity materials are separated and volatile solvents also evaporate.

이어서, 본 발명의 실시예에 따른 배향막의 광배향방법은 대략 200℃~250℃ 사이의 온도에서 층 분리된 고감도 재료와 저감도 재료를 경화시킨 후에 편광 자외선을 조사한다. 편광 자외선에 노출될 때, 표면층(22A)의 고감도 재료는 광분해되는 반면, 표면층(22A)과 기판(21) 사이의 벌크층(22B)을 이루는 저감도 재료는 광분해되지 않는다. 따라서, 벌크층(22B)은 결함이 발생되지 않으므로 구조적으로 안정한 상태를 유지하여 표면층(22A)을 지지한다. Subsequently, the optical alignment method of the alignment layer according to the embodiment of the present invention irradiates polarized ultraviolet rays after curing the high-sensitivity material and the low-sensitivity material separated from each other at a temperature between about 200 ° C and 250 ° C. When exposed to polarized ultraviolet light, the high sensitivity material of the surface layer 22A is photolyzed while the low sensitivity material which forms the bulk layer 22B between the surface layer 22A and the substrate 21 is not photolyzed. Therefore, since the bulk layer 22B does not generate a defect, it maintains a structurally stable state and supports the surface layer 22A.

이상 설명한 내용을 통해 당업자라면 본 발명의 기술사상을 일탈하지 아 니하는 범위에서 다양한 변경 및 수정이 가능함을 알 수 있을 것이다. 따라서, 본 발명의 기술적 범위는 명세서의 상세한 설명에 기재된 내용으로 한정되는 것이 아니라 특허 청구의 범위에 의해 정하여져야만 할 것이다.Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

도 1은 종래의 배향막에서 광분해에 의해 초래되는 벌크층의 결함을 보여 주는 단면도. 1 is a cross-sectional view showing a defect of a bulk layer caused by photolysis in a conventional alignment film.

도 2는 본 발명의 실시예에 따른 액정표시장치의 배향막 구조를 보여 주는 단면도. 2 is a cross-sectional view illustrating a structure of an alignment layer of a liquid crystal display according to an exemplary embodiment of the present invention.

도 3은 표면층에 적용 가능한 재료의 예를 보여 주는 도면. 3 shows an example of a material applicable to a surface layer.

도 4는 벌크층에 적용 가능한 재료의 예를 보여 주는 도면.4 shows an example of a material applicable to a bulk layer.

도 5는 벌크층에 적용 가능한 재료의 다른 예를 보여 주는 도면. 5 shows another example of a material applicable to a bulk layer.

도 6은 표면층의 재료와 벌크층의 재료를 보여 주는 도면. 6 shows the material of the surface layer and the material of the bulk layer.

도 7은 본 발명의 실시예에 따른 배향막의 광 배향방법을 보여 주는 도면. 7 is a view showing a photo alignment method of the alignment film according to an embodiment of the present invention.

〈도면의 주요 부분에 대한 부호의 설명〉<Explanation of symbols for main parts of drawing>

21 : 기판 22 : 배향막21 substrate 22 alignment film

22A : 표면층 22B : 벌크층22A: Surface layer 22B: Bulk layer

Claims (4)

광분해가 가능한 고감도 재료를 포함한 표면층과,A surface layer containing a photosensitive high sensitivity material, 상기 표면층과 기판 사이에 위치하고 상기 고감도 재료보다 광분해가 어렵고 상기 고감도 재료보다 표면 에너지가 큰 저감도 재료를 포함한 벌크층을 포함하는 것을 특징으로 하는 액정표시장치의 배향막.And a bulk layer between the surface layer and the substrate, the bulk layer including a low-sensitivity material that is less photodegradable than the high-sensitivity material and has a higher surface energy than the high-sensitivity material. 제 1 항에 있어서,The method of claim 1, 상기 표면층과 상기 저감도 재료는 폴리이미드 계열의 재료를 포함하는 것을 특징으로 하는 액정표시장치의 배향막.The surface layer and the low sensitivity material include a polyimide-based material, an alignment layer of a liquid crystal display device. 광분해가 가능한 고감도 재료와 상기 고감도 재료보다 광분해가 어렵고 상기 고감도 재료보다 표면 에너지가 큰 저감도 재료의 혼합용액을 기판 상에 코팅하는 단계;Coating on the substrate a mixed solution of a high sensitivity material capable of photolysis and a low sensitivity material that is more difficult to photolysis than the high sensitivity material and has a higher surface energy than the high sensitivity material; 상기 혼합용액을 건조시켜 상기 고감도 재료와 상기 저감도 재료의 층 분리를 유도하여 기판 상에 유기막을 형성하는 단계; 및Drying the mixed solution to induce layer separation of the high sensitivity material and the low sensitivity material to form an organic film on a substrate; And 상기 유기막 상에 편광 자외선을 조사하는 것을 특징으로 하는 액정표시장치의 배향막의 광 배향방법.Polarizing ultraviolet light is irradiated on the said organic film, The photo-alignment method of the alignment film of the liquid crystal display device. 제 3 항에 있어서,The method of claim 3, wherein 상기 표면층과 상기 저감도 재료는 폴리이미드 계열의 재료를 포함하는 것을 특징으로 하는 액정표시장치의 배향막의 광 배향방법.And the surface layer and the low sensitivity material comprise a polyimide-based material.
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Publication number Priority date Publication date Assignee Title
US8809864B2 (en) 2011-06-27 2014-08-19 Samsung Display Co., Ltd. Liquid crystal display and method for manufacturing the same
KR20150034476A (en) * 2013-09-26 2015-04-03 삼성디스플레이 주식회사 Liquid crystal photo alignment agent, liquid crystal display device including the same and method of manufacturing the same

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KR100720085B1 (en) * 1999-07-27 2007-05-18 삼성전자주식회사 A manufacturing method of thin film transistor substrate for liquid crystal display
JP2002287151A (en) * 2001-01-17 2002-10-03 Matsushita Electric Ind Co Ltd Liquid crystal display element and manufacturing method therefor
KR100508102B1 (en) * 2002-10-22 2005-08-18 엘에스전선 주식회사 Composition for liquid crystal alignment composed of compounds of photosensitive polymers and non-photosensitive polymers, preparation method of the film for photoinduced liquid crystal thereby and the liguid crystal cell comprising the film
KR20070122467A (en) * 2005-03-01 2007-12-31 다이니폰 인사츠 가부시키가이샤 Film with alignment film and optical device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8809864B2 (en) 2011-06-27 2014-08-19 Samsung Display Co., Ltd. Liquid crystal display and method for manufacturing the same
US8912026B2 (en) 2011-06-27 2014-12-16 Samsung Display Co., Ltd. Liquid crystal display and method for manufacturing the same
KR20150034476A (en) * 2013-09-26 2015-04-03 삼성디스플레이 주식회사 Liquid crystal photo alignment agent, liquid crystal display device including the same and method of manufacturing the same

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