KR100243999B1 - Manufacturing method of liquid crystal display device with wide viewing angle - Google Patents
Manufacturing method of liquid crystal display device with wide viewing angle Download PDFInfo
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- KR100243999B1 KR100243999B1 KR1019960066367A KR19960066367A KR100243999B1 KR 100243999 B1 KR100243999 B1 KR 100243999B1 KR 1019960066367 A KR1019960066367 A KR 1019960066367A KR 19960066367 A KR19960066367 A KR 19960066367A KR 100243999 B1 KR100243999 B1 KR 100243999B1
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- liquid crystal
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- display device
- viewing angle
- alignment
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 53
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims abstract description 13
- 230000001427 coherent effect Effects 0.000 claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 4
- 210000004027 cell Anatomy 0.000 claims 2
- 210000002858 crystal cell Anatomy 0.000 claims 1
- 239000005264 High molar mass liquid crystal Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 8
- 239000004642 Polyimide Substances 0.000 description 6
- 229920001721 polyimide Polymers 0.000 description 6
- 229920001002 functional polymer Polymers 0.000 description 5
- 230000007547 defect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000007699 photoisomerization reaction Methods 0.000 description 1
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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
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- Nonlinear Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
본 발명은 광기능성 고분자 액정배향막을 갖는 액정 표시소자에 관한 것으로, 특히 광기능성 고분자 액정배향막의 배향방향을 주기적으로 방향을 달리하는 멀티 도메인 형태로 제조함으로서, 시야각을 크게 증가시킨 액정 표시소자를 제조하는 방법에 관한 것이다. 특히, 상기 광기능성 고분자 액정배향막의 배향영역을 멀티 도메인 형태로 형성하는 방법으로 광기능성 고분자 액정 배향막을 갖는 액정 표시소자를 제조하고, 그 액정 표시소자의 한쪽 유리기판 상부로부터 간섭성이 있는 두 개 이상의 빛을 노광시켜 액정배향막을 멀티 도메인으로 형성함으로서 시야각을 넓힌 액정 표시소자를 제공한다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a photofunctional polymer liquid crystal alignment film. In particular, the liquid crystal display device having a large viewing angle is manufactured by manufacturing the alignment direction of the photofunctional polymer liquid crystal alignment film in a multi-domain form in which the direction is periodically varied. It is about how to. In particular, a liquid crystal display device having a photofunctional polymer liquid crystal alignment layer is manufactured by forming an alignment region of the photofunctional polymer liquid crystal alignment layer in a multi-domain form, and two coherent substrates are formed from one upper glass substrate of the liquid crystal display element. A liquid crystal display device having a wider viewing angle is provided by exposing the above light to form a liquid crystal alignment film in a multi-domain.
Description
본 발명은 액정 표시소자에 관한 것으로, 특히 액정 표시소자에 사용되는 광기능성 고분자 액정 배향막에 간섭성이 있는 두 개 이상의 빛을 노광하여 액정 배향막의 광기능성 고분자가 서로 다른 배향방향을 갖는 영역을 생성시킴으로써 액정의 배향상태를 멀티 도메인으로 만들므로서 시야각을 넓힌 액정 표시소자의 제조방법에 관한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and in particular, to expose a photofunctional polymer liquid crystal aligning film used in a liquid crystal display device to expose two or more interfering lights, thereby generating a region in which the optical functional polymers of the liquid crystal alignment film have different alignment directions. The present invention relates to a method for manufacturing a liquid crystal display device having a wide viewing angle while making the alignment state of the liquid crystal into a multi-domain.
일반적으로 액정 표시소자는 도1에 도시된 바와 같이 두개의 유리기판(11,12) 각각의 한면에 투명전극(13,14)과 광기능성 고분자 또는 폴리이미드를 사용하여 액정배향막(15,16)을 순차적으로 형성한 후, 상기 액정배향막(15,16)을 편광된 빛이나 러빙에 의해 일정한 방향으로 배향시킨다. 다음에 상기 액정배향막(15,16)이 마주보도록 실링을 실시하여 셀을 제조하고, 상기 셀 내부의 공간에 액정(17)을 주입한 후, 밀봉함으로써 액정 표시소자를 제조하였다.In general, as shown in FIG. 1, the liquid crystal display device uses the transparent electrodes 13 and 14 and the photofunctional polymer or polyimide on one surface of each of the two glass substrates 11 and 12. After sequentially forming, the liquid crystal alignment layers 15 and 16 are aligned in a predetermined direction by polarized light or rubbing. Next, the cell was manufactured by sealing the liquid crystal alignment layers 15 and 16 so as to face each other, and after the liquid crystal 17 was injected into the space inside the cell, a liquid crystal display device was manufactured by sealing.
그러나 상술한 액정 표시소자는 유리기판 상에 형성되는 액정배향막의 배향방향이 단방향 또는 양방향으로 배향되기 때문에 셀 내부의 액정 배향방향도 역시 단 방향 또는 양방향으로 배향되어 구동시 시야각이 좁다는 문제점이 있었다.However, the liquid crystal display device described above has a problem in that the alignment direction of the liquid crystal alignment layer formed on the glass substrate is oriented in one direction or in both directions, so that the liquid crystal alignment direction inside the cell is also oriented in one direction or in both directions, so that the viewing angle is narrow during driving. .
이를 해결하기 위하여 액정 표시소자의 시야각을 넓히기 위한 종래의 방법으로 액정 표시소자의 폴리이미드 배향막을 배향방향이 다른 영역을 주기적으로 갖는 멀티 도메인 형태로 형성하여 액정의 배향을 멀티 도메인 형태로 형성함으로써 구동시 시야각을 넓혔다. 상기 폴리이미드 배향막을 배향방향이 다른 영역을 주기적으로 갖는 멀티 도메인형태로 제조하는 방법은 투명전극이 형성되어 있는 유리기판 상부에 폴리이미드 배향막을 형성하고, 상기 폴리이미드 배향막을 일정한 방향으로 배향시키는 과정에서 다영역으로 패턴화된 마스크를 부착하거나 분리시키면서 러빙 공정을 실시하여 배향방향을 달리하는 영역을 주기적으로 갖는 멀티 도메인 형태의 러빙된 배향막을 형성하였다.In order to solve this problem, the polyimide alignment layer of the liquid crystal display device is formed in a multi-domain form having a region having a different alignment direction periodically, and the liquid crystal alignment is formed in a multi-domain form. Widened viewing angle In the method of manufacturing the polyimide alignment layer in a multi-domain form periodically having regions having different alignment directions, a process of forming a polyimide alignment layer on the glass substrate on which the transparent electrode is formed and orienting the polyimide alignment layer in a predetermined direction A rubbing process was performed while attaching or detaching a patterned mask to a multi-region at to form a multi-domain rubbed alignment film having regions having different orientation directions periodically.
상술한 배향방향을 멀티 도메인 형태로 배향시킨 폴리이미드 배향막을 형성하기 위한 방법은 다영역으로 패턴회된 마스크를 사용하기 때문에 러빙에 의한 표면 불균일을 필수적으로 유발하게 된다. 따라서 액정 표시소자에 많은 결함이 발생하여 수율이 떨어진다는 문제점이 있다. 또한, 패턴화된 마스크 패턴을 부착 또는 분리하면서 러빙방향을 달리하여 여러번 러빙을 실시해야 하기 때문에 제조공정이 복잡해진다는 문제점도 있다.The method for forming the polyimide alignment layer in which the above-mentioned orientation direction is oriented in a multi-domain form uses a mask patterned in multiple regions, thereby necessarily causing surface unevenness due to rubbing. Therefore, a large number of defects occur in the liquid crystal display, resulting in a poor yield. In addition, there is a problem that the manufacturing process is complicated because the rubbing direction has to be performed several times while attaching or detaching the patterned mask pattern.
따라서 본 발명은 상기 문제점을 해결하기 위하여 액정 표시소자의 액정 배향막을 광기능성 고분자를 사용하여 제조하고, 액정을 주입한 다음, 한쪽의 유리기판 상부로부터 간섭성이 있는 두 개 이상의 빛을 조사하므로써 광기능성 고분자 액정배향막에 서로다른 배향방향을 갖는 영역을 주기적으로 생성시켜 셀 내부의 액정을 멀티 도메인으로 배향한 액정 표시소자를 제조하는 방법을 제공하는 것을 목적으로 한다.Accordingly, in order to solve the above problems, the present invention provides a liquid crystal alignment layer of a liquid crystal display device by using a photofunctional polymer, injects liquid crystal, and then irradiates two or more coherent lights from one glass substrate to the top. It is an object of the present invention to provide a method of manufacturing a liquid crystal display device in which liquid crystal molecules in a cell are aligned in a multi-domain by periodically generating regions having different alignment directions in a functional polymer liquid crystal alignment film.
도1은 일반적인 광기능성 고분자 액정 배향막을 이용한 액정 표시소자의 구조를 나타낸 단면도.1 is a cross-sectional view showing the structure of a liquid crystal display device using a general optical functional polymer liquid crystal alignment film.
도2는 본 발명에 따라 액정 표시소자의 시야각을 넓히기 위하여 광기능성 액정 배향막에 두 개의 간섭성 빛을 조사하는 공정을 나타낸 단면도.FIG. 2 is a cross-sectional view illustrating a process of irradiating two coherent lights onto a photofunctional liquid crystal alignment layer to widen a viewing angle of a liquid crystal display device according to the present invention; FIG.
도3은 도2의 두 개의 간섭성 빛에 노광되어 배향영역이 멀티 도메인형태로 형성된 액정배향막을 나타낸 평면도.FIG. 3 is a plan view showing a liquid crystal alignment film in which an alignment region is formed in a multi-domain form by exposure to two coherent lights of FIG.
〈도면의주요부분에대한부호의설명〉〈Description of the symbols for the main parts of the drawings〉
11,12 : 유리기판 13,14 : 투명전극11,12 glass substrate 13,14 transparent electrode
15,16 : 광기능성 배향막 17 : 액정15,16: photofunctional alignment layer 17: liquid crystal
18,19 : 간섭성 있는 광이성화 빛살18,19: coherent photoisomerization light
20 : 간섭무늬20: interference pattern
본 발명은 액정 표시소자의 시야각을 넓히기 위하여 액정을 배향하기 위한 배향막으로 광기능성 고분자를 사용하며, 광기능성 고분자를 사용하여 형성된 액정배향막에 간섭성을 가지는 두 개이상의 빛을 조사하여 액정배향막을 배향방향이 다른 영역을 주기적으로 갖는 멀티 도메인 형태의 액정 배향막을 형성하고, 그 액정배향막에 의해 액정의 배향을 멀티 도메인 형태로 배향시킨 액정 표시소자에 관한 것이다.The present invention uses a photo-functional polymer as an alignment layer for aligning the liquid crystal in order to widen the viewing angle of the liquid crystal display device, and aligns the liquid crystal alignment layer by irradiating two or more lights having coherence to the liquid crystal alignment layer formed using the photo-functional polymer. The liquid crystal aligning film of the multidomain form which has the area | region which differs in a direction periodically is formed, and this liquid crystal aligning film relates to the liquid crystal display element which orientated the liquid crystal in the multidomain form.
이하, 첨부된 도면을 참조로 하여 본 발명을 상세히 설명하기로 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
도1은 본 발명에 따라 액정 표시소자의 시야각을 넓히기 위해 유리기판 상부로부터 간섭성 있는 두 개의 빛을 조사하는 공정을 나타낸 것으로써, 액정 표시소자는 두장의 유리기판(11,12) 각각의 마주보는 면에 투명전극(13,14)이 형성되어 있으며, 상기 투명전극(11,12) 상부에는 광기능성 고분자를 사용하여 광배향막(15,16)이 형성되어 있다. 그리고 투명전극(15,16)과 광배향막(13,14)이 형성된 두장의 유리기판(11,12)을 광배향막(15,16)이 마주보도록 실링하여 셀을 형성한 다음, 상기 광배향막(15,16)의 배향을 멀티 도메인으로 형성하기 위하여 한쪽의 유리기판(12) 상부로부터 간섭성 있는 두 개의 빛(18,19)을 조사하는 공정을 나타낸 것이다.1 shows a process of irradiating two coherent lights from an upper portion of a glass substrate in order to widen the viewing angle of the liquid crystal display device according to the present invention, wherein the liquid crystal display device faces each of the two glass substrates 11 and 12. Transparent electrodes 13 and 14 are formed on the viewing surface, and optical alignment layers 15 and 16 are formed on the transparent electrodes 11 and 12 by using a photofunctional polymer. The glass substrates 11 and 12 having the transparent electrodes 15 and 16 and the optical alignment layers 13 and 14 formed thereon are formed so as to face each other so that the optical alignment layers 15 and 16 face each other, thereby forming a cell. The process of irradiating two coherent lights 18 and 19 from the top of one glass substrate 12 in order to form the orientation of 15 and 16 into a multi-domain.
상기와 같이 간섭성 있는 두 개의 빛(18,19)을 조사하게 되면 먼저 광배향막(15,16)의 광고분자들이 빛의 간섭에 따라 배향방향이 다른 영역을 주기적으로 형성하게 된다. 이때, 상기 멀티 도메인 형태로 제조된 배향막을 갖는 셀 내부에 액정(17)을 주입하게 되면 배향막(15,16)의 각 배향영역에 따라 액정이 배열된다. 그러면 각각의 액정배향 영역(도메인)은 단일 영역으로는 단일 배향성을 갖는 반면 이웃한 도메인들과는 도3에 도시된 바와 같이 90도의 배향각의 차이를 나타내게 된다. 따라서 액정 도메인들은 빛의 회절 현상을 유발하게되어 입사되는 빛의 진행방향에 수직한 방향의 진행성분을 얻게되어 결국 시야각을 넓히게 되는 것이다. 상술한 것과 같은 도메인 패턴을 2차원으로 구성하면 액정 디스플레이의 시야각을 상하,좌우 모두 넓힐수 있게 된다.When the two coherent lights 18 and 19 are irradiated as described above, advertisement molecules of the photo alignment layers 15 and 16 periodically form regions having different alignment directions depending on the interference of light. In this case, when the liquid crystal 17 is injected into the cell having the alignment layer manufactured in the multi-domain form, the liquid crystal is arranged according to each alignment region of the alignment layers 15 and 16. Then, each liquid crystal alignment region (domain) has a single orientation in a single region, but exhibits a difference of 90 degrees of alignment angle with neighboring domains as shown in FIG. 3. Accordingly, the liquid crystal domains cause diffraction of light to obtain a traveling component perpendicular to the direction of incident light, thereby widening the viewing angle. When the domain pattern as described above is configured in two dimensions, the viewing angle of the liquid crystal display can be widened up, down, left and right.
본 발명에 따른 간섭성 빛을 이용하여 시야각을 넓힌 액정 표시소자는 종래의 러빙된 배향막을 갖는 액정 표시소자 보다 광 시야각이 넓고 균일한 표시소자를 제조할 수 있다.A liquid crystal display device having a wider viewing angle using coherent light according to the present invention can produce a display device having a wider viewing angle and a uniformity than a liquid crystal display device having a conventional rubbed alignment layer.
또한 종래의 러빙방법을 사용할 때 보다 제조공정을 단순화하여 빠른 시간 내에 제조할 수 있으며, 간섭무늬의 간격을 조절함으로써 도메인의 크기를 임의로 조절하는 것이 가능하다.In addition, when using the conventional rubbing method can be manufactured in a short time by simplifying the manufacturing process, it is possible to arbitrarily adjust the size of the domain by adjusting the interval of the interference fringe.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950009327A (en) * | 1993-09-18 | 1995-04-21 | 이헌조 | Method for forming photopolymer alignment layer for liquid crystal display device (LCD) |
| JPH07248499A (en) * | 1994-03-09 | 1995-09-26 | Toshiba Corp | Liquid crystal display element |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR950009327A (en) * | 1993-09-18 | 1995-04-21 | 이헌조 | Method for forming photopolymer alignment layer for liquid crystal display device (LCD) |
| JPH07248499A (en) * | 1994-03-09 | 1995-09-26 | Toshiba Corp | Liquid crystal display element |
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