KR100513650B1 - LCD Display - Google Patents
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- KR100513650B1 KR100513650B1 KR10-1998-0021950A KR19980021950A KR100513650B1 KR 100513650 B1 KR100513650 B1 KR 100513650B1 KR 19980021950 A KR19980021950 A KR 19980021950A KR 100513650 B1 KR100513650 B1 KR 100513650B1
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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
- G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
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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
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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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
- G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Geometry (AREA)
- Liquid Crystal (AREA)
Abstract
본 발명은 응답 속도를 개선함과 아울러, 컬러 쉬프트 및 시야각을 개선시킬 수 있는 액정 표시 장치를 개시한다. 개시된 본 발명의 액정 표시 장치는, 상하 기판이 소정거리를 두고 대향배치되며, 대향면에는 전극들이 구비된다. 상하 기판 사이에는 수개의 분자를 포함하는 액정이 포함된다. 상하 기판의 전극 상부 각각에 서로 상하 대응을 이루면서 적어도 하나 이상의 경사 구조물이 배치된다. 또한, 상기 경사 구조물 표면에 배향막이 배치된다. 여기서, 전극들 사이에 전계가 형성되지 않는 경우에는, 상기 액정 분자들은 경사 구조물의 경사면 표면과 수직을 이루도록 배열되며, 전극들 사이에 전계가 형성되는 경우에는, 상기 액정 분자들은 전계와 그것의 광축이 수직 또는 평행을 이루도록 배열되면서, 전극 표면에 광축이 수직 또는 평행하도록 배열되는 것을 특징으로 한다.The present invention discloses a liquid crystal display device capable of improving response speed and improving color shift and viewing angle. In the disclosed liquid crystal display device, the upper and lower substrates are disposed to face each other at a predetermined distance, and the opposite surfaces are provided with electrodes. A liquid crystal containing several molecules is included between the upper and lower substrates. At least one or more inclined structures are disposed on the upper and lower electrodes of the upper and lower substrates, respectively. In addition, an alignment layer is disposed on the inclined structure surface. Here, when no electric field is formed between the electrodes, the liquid crystal molecules are arranged to be perpendicular to the inclined surface of the inclined structure, and when an electric field is formed between the electrodes, the liquid crystal molecules are formed with the electric field and its optical axis. While being arranged to be vertical or parallel, the optical axis is arranged to be perpendicular or parallel to the electrode surface.
Description
본 발명은 액정 표시 장치에 관한 것으로, 보다 구체적으로는 응답 속도를 개선시키면서 시야각 및 컬러 쉬프트를 개선시킬 수 있는 액정 표시 장치에 관한 것이다.The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of improving a viewing angle and color shift while improving a response speed.
현재 많이 이용되는 TN(twist nematic) 모드는 근본적으로 좁은 시야각 특성과 늦은 응답 특성 특히 그레이 스케일 동작 등과 같은 문제점을 갖는다.TN (twist nematic) mode, which is widely used today, has problems such as fundamentally narrow viewing angle characteristics and late response characteristics, especially gray scale operation.
이에 따라, 종래에는 높은 수행 능력과 넓은 시야각 및 빠른 응답 특성을 갖는 광학 보상 굴절 모드(Optically Compensated birefringence:이하 OCB) 모드 액정 표시 장치가 제안되었다.Accordingly, in the related art, an optically compensated birefringence (OCB) mode liquid crystal display having high performance, a wide viewing angle, and fast response characteristics has been proposed.
이러한 OCB 모드는 도 1a에 도시된 바와 같이, 하부 기판(1) 상부에 화소 전극(2)이 형성되고, 하부 기판(1)과 대향하는 상부 기판(5)의 내측면에는 상대 전극(6)이 형성된다. 화소 전극(2) 및 상대 전극(6)의 표면에는 배향막(3,7)이 각각 형성된다. 여기서, 배향막(3,7)은 수평 배향막이고, 응답 속도를 개선시키기 위하여, 초기 프리틸트각(pretilt angle)이 5도 정도가 되도록 러빙처리된다. In the OCB mode, as illustrated in FIG. 1A, the pixel electrode 2 is formed on the lower substrate 1, and the counter electrode 6 is formed on the inner surface of the upper substrate 5 facing the lower substrate 1. Is formed. Alignment films 3 and 7 are formed on the surfaces of the pixel electrode 2 and the counter electrode 6, respectively. Here, the alignment films 3 and 7 are horizontal alignment films, and in order to improve the response speed, rubbing treatment is performed such that the initial pretilt angle is about 5 degrees.
이러한 구조를 갖는 액정 표시 장치는, 화소 전극(2)과 상대 전극(6)사이에 전계가 형성되기 이전에는, 배향막(3,7)의 영향으로 액정 분자는 π 형태 즉, 기판측 액정 분자(8)는 기판과 소정각을 이루며 배열되면서, 액정층(8) 중앙에는 액정 분자(8a)의 장축이 기판면과 거의 수직을 이루도록 배열된다.In the liquid crystal display having such a structure, before the electric field is formed between the pixel electrode 2 and the counter electrode 6, the liquid crystal molecules are in the? Form, i.e., the substrate-side liquid crystal molecules ( 8) is arranged at a predetermined angle with the substrate, in the center of the liquid crystal layer 8 is arranged such that the major axis of the liquid crystal molecules 8a is substantially perpendicular to the substrate surface.
한편, 화소 전극(2)과 상대 전극(6) 사이에 전계가 형성되면, 액정 분자(8a)들은 유전율 이방성이 양인 경우, 도 1b와 같이, 기판면에 수직을 이루도록 배열된다. On the other hand, when an electric field is formed between the pixel electrode 2 and the counter electrode 6, the liquid crystal molecules 8a are arranged to be perpendicular to the substrate surface as shown in FIG. 1B when the dielectric anisotropy is positive.
상기한 OCB 모드의 액정 표시 장치는 비교적 큰 프리틸트각에 의하여, TN모드 보다는 빠른 응답 속도를 갖는다.The liquid crystal display of the OCB mode described above has a faster response speed than the TN mode due to a relatively large pretilt angle.
그러나, 상기와 같이 큰 프리틸트각을 부여하기 위하여는 배향막에 강한 러빙 공정을 진행하여야 하므로, 배향막에 손상이 발생되기 쉽다.However, in order to impart a large pretilt angle as described above, a strong rubbing process must be performed on the alignment film, so that damage to the alignment film is likely to occur.
또한, 상하 기판의 배향막을 정확히 대칭을 이루도록 러빙하기 어렵다.In addition, it is difficult to rub the alignment film of the upper and lower substrates so as to be exactly symmetrical.
따라서, 본 발명의 목적은 러빙없이도 프리틸트각을 부여하여 응답 속도를 개선시킬 수 있는 액정 표시 장치를 제공하는 것이다.Accordingly, an object of the present invention is to provide a liquid crystal display device capable of improving the response speed by providing a pretilt angle without rubbing.
상기한 본 발명의 목적을 달성하기 위하여, 본 발명의 일 실시예에 따르면, 상하 기판은 소정거리를 두고 대향배치되며, 대향면에는 전극들이 구비된다. 상하 기판 사이에는 수개의 분자를 포함하는 액정이 포함된다. 상하 기판의 전극 상부 각각에 서로 상하 대응을 이루면서 적어도 하나 이상의 경사 구조물이 배치된다. 또한, 상기 경사 구조물 표면에 배향막이 배치된다. 여기서, 전극들 사이에 전계가 형성되지 않는 경우에는, 상기 액정 분자들은 경사 구조물의 경사면 표면과 수직을 이루도록 배열되며, 전극들 사이에 전계가 형성되는 경우에는, 상기 액정 분자들은 전계와 그것의 광축이 수직 또는 평행을 이루도록 배열되면서, 전극 표면에 광축이 수직 또는 평행하도록 배열되는 것을 특징으로 한다.In order to achieve the above object of the present invention, according to an embodiment of the present invention, the upper and lower substrates are disposed to face a predetermined distance, the electrode is provided on the opposite surface. A liquid crystal containing several molecules is included between the upper and lower substrates. At least one or more inclined structures are disposed on the upper and lower electrodes of the upper and lower substrates, respectively. In addition, an alignment layer is disposed on the inclined structure surface. Here, when no electric field is formed between the electrodes, the liquid crystal molecules are arranged to be perpendicular to the inclined surface of the inclined structure, and when an electric field is formed between the electrodes, the liquid crystal molecules are formed with the electric field and its optical axis. While being arranged to be vertical or parallel, the optical axis is arranged to be perpendicular or parallel to the electrode surface.
본 발명에 의하면, 전극 상부에 적어도 하나 이상의 경사 구조물을 대칭적으로 배치시키므로써, 별도의 프리틸트각을 부여하지 않고도 액정 분자들을 휘어지도록 배열시킨다. According to the present invention, by arranging at least one inclined structure symmetrically on the electrode, the liquid crystal molecules are arranged to bend without imparting a separate pretilt angle.
(실시예)(Example)
이하 첨부한 도면에 의거하여 본 발명의 바람직한 실시예를 자세히 설명하도록 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
첨부한 도면 도 2a 및 도 2b는 본 발명의 일 실시예에 따른 액정 표시 장치의 단면도이고, 도 3a 및 도 3b는 본 발명의 다른 실시예에 따른 액정 표시 장치의 단면도이다.2A and 2B are cross-sectional views of a liquid crystal display according to an exemplary embodiment of the present invention, and FIGS. 3A and 3B are cross-sectional views of a liquid crystal display according to another exemplary embodiment of the present invention.
본 발명은 배향막의 러빙 공정을 배제하면서도 큰 프리틸트각을 부여하여 응답 속도를 개선시키기 위하여, 액정 표시 장치의 기판 내측면 각각에 경사 구조물을 배치시킨다.In order to improve response speed by providing a large pretilt angle while eliminating the rubbing process of the alignment layer, the inclined structure is disposed on each of the inner side surfaces of the substrate of the liquid crystal display device.
즉, 도 2a를 참조하여, 하부 기판(10)과 상부 기판(15)은 소정 거리를 두고 대향 배치되어 있다. 하부 기판(10)의 내측면에는 화소 전극(11)이 배치되고, 상부 기판(15)의 내측면에는 상대 전극(16)이 배치된다.That is, referring to FIG. 2A, the lower substrate 10 and the upper substrate 15 are disposed to face each other at a predetermined distance. The pixel electrode 11 is disposed on the inner surface of the lower substrate 10, and the counter electrode 16 is disposed on the inner surface of the upper substrate 15.
화소 전극(11)의 표면과 상대 전극(16)의 표면에는 경사 구조물(12,17)이 배치된다. 이때, 경사 구조물(12,17)은 폴리머와 같은 유기 절연막으로 형성되며, 예를들어, 직각 삼각형 형태를 갖는다. 상하 기판(11,15)에 형성되는 경사 구조물(12,17)은 동일 사이즈를 가지며, 밑변이 전극(11,16) 표면에 배치되고, 높이축이 서로 대응되도록 배치된다. 이때, 경사 구조물의 높이는 하기 식 1의 투과율 공식에서 최대 투과율을 만족할 수 있도록 한다. 즉, 경사 구조물 사이의 거리(d)와 액정의 복굴절율(Δn)과의 곱을 입사광의 파장(λ)으로 나눈 값(dΔn/λ)이 2분의 1이 되도록, 경사 구조물(12,17)의 높이를 결정한다.Inclined structures 12 and 17 are disposed on the surface of the pixel electrode 11 and the surface of the counter electrode 16. At this time, the inclined structures 12 and 17 are formed of an organic insulating film such as a polymer, and have, for example, a right triangle shape. The inclined structures 12 and 17 formed on the upper and lower substrates 11 and 15 have the same size, and the bottom sides are disposed on the surfaces of the electrodes 11 and 16 and the height axes thereof correspond to each other. At this time, the height of the inclined structure to satisfy the maximum transmittance in the transmittance formula of Equation 1 below. That is, the value obtained by dividing the distance (d) and the wavelength of the incident light (λ) the product of the liquid crystal birefringence (Δ n) of between inclined structure (d Δ n / λ), inclined structure so that the one-two minutes of (12 , 17) is determined.
T≒T0 sin2(2χ)·sin2(π·Δnd/λ)..............(식 1)T ≒ T 0 sin 2 (2χ) · sin 2 (π · Δ nd / λ) .............. (Equation 1)
T: 투과율T: transmittance
T0 : 참조(reference)광에 대한 투과율T 0 : Transmittance for reference light
χ: 액정 분자의 광축과 편광자의 편광축이 이루는 각χ: angle formed between the optical axis of the liquid crystal molecules and the polarization axis of the polarizer
Δn : 굴절율 이방성 Δ n: refractive index anisotropy
d : 경사 구조물간의 거리d: distance between inclined structures
λ: 입사되는 광 파장λ: incident light wavelength
경사 구조물(12,17)의 빗변에 배향막(13,18)이 코팅된다. 이때, 배향막(13,18)은 러빙 처리가 되지 않은 수직 배향막이다.The alignment layers 13 and 18 are coated on the hypotenuses of the inclined structures 12 and 17. At this time, the alignment films 13 and 18 are vertical alignment films which are not subjected to the rubbing treatment.
그리고, 도면에는 도시되지 않았지만, 하부 기판(10)의 외측면에는 편광자가 배치되고, 상부 기판(15)의 외측면에는 분해자가 배치된다. 여기서 편광자의 편광축과 분해자의 흡수축은 서로 직교되도록 배치된다.Although not shown in the drawings, a polarizer is disposed on an outer surface of the lower substrate 10, and a decomposer is disposed on an outer surface of the upper substrate 15. Here, the polarization axis of the polarizer and the absorption axis of the decomposer are arranged to be orthogonal to each other.
이와같은 구성을 갖는 액정 표시 장치는 화소 전극(11)과 상대 전극(16) 사이에 전계가 형성되지 않으면, 액정 분자(20a)들은 배향막(13,18)의 영향으로, 배향막(13,18) 표면에 대하여 수직으로 배열된다. 이때, 배향막(13,18)은 경사 구조물(12,17)의 빗변에 배치되므로, 결과적으로 액정 분자(20a)들은 경사 구조물(12,17)의 빗변에 수직 형태로 배치된다. 따라서, 전계가 형성되지 않을경우의 액정 분자(20a)들은 경사 구조물에 의하여 밴드(bend) 배열을 하게 된다.In the liquid crystal display having such a configuration, when no electric field is formed between the pixel electrode 11 and the counter electrode 16, the liquid crystal molecules 20a are influenced by the alignment layers 13 and 18. Arranged perpendicular to the surface. In this case, since the alignment layers 13 and 18 are disposed on the hypotenuses of the inclined structures 12 and 17, the liquid crystal molecules 20a are disposed in a perpendicular form to the hypotenuses of the inclined structures 12 and 17. Therefore, the liquid crystal molecules 20a when the electric field is not formed are arranged in a band by the inclined structure.
그러므로, 편광자를 통하여 직선 편광된 광은 액정(20)을 지나면서 편광 상태가 바뀌어서 분해자를 통과하게 된다.Therefore, the linearly polarized light through the polarizer changes the polarization state while passing through the liquid crystal 20 and passes through the decomposer.
한편, 화소 전극(11)과 상대 전극(16) 사이에 전계(E)형성되면, 액정 분자(20a)들은 경사 구조물(12,17)과 상관없이 화소 전극(11) 및 상대 전극(16)의 표면에 법선 형태로 배열된다(유전율 이방성이 양인 액정을 사용했을 경우).On the other hand, when the electric field E is formed between the pixel electrode 11 and the counter electrode 16, the liquid crystal molecules 20a may be formed of the pixel electrode 11 and the counter electrode 16 regardless of the inclined structures 12 and 17. It is arranged on the surface in a normal form (when using a liquid crystal having a positive dielectric anisotropy).
따라서, 편광자를 통과한 광은 액정(20)을 통과하면서 편광 상태가 변화되지 않아, 분해자를 통과하지 못한다.Therefore, the light passing through the polarizer does not change the polarization state while passing through the liquid crystal 20, and thus cannot pass through the decomposer.
도 3a는 하나의 단위 화소에 적어도 하나이상 예를들어 두개의 경사 구조물을 대칭 배치시킨 것으로, 도면에서와 같이, 단위화소당 경사 구조물(12a,12b,17a,17b)이 기판면에 대하여 각각 대칭되면서, 상하 대응되도록 배치된다. 그리고, 경사 구조물(12a, 12b, 17a, 17b) 표면에 수직 배향막(13,17)이 배치된다.3A illustrates that at least one, for example, two inclined structures are symmetrically arranged in one unit pixel. As shown in the drawing, the inclined structures 12a, 12b, 17a, and 17b per unit pixel are symmetrical with respect to the substrate surface. While being disposed so as to correspond up and down. The vertical alignment layers 13 and 17 are disposed on the surfaces of the inclined structures 12a, 12b, 17a, and 17b.
그러면, 전계가 형성되기 이전에는, 액정 분자들(20a)은 경사 구조물(12a, 12b, 17a, 17b) 표면에 대하여 수직을 이루도록 배열된다. 이때, 하나의 단위 화소당 경사 구조물이 적어도 하나 이상 대칭되도록 배열되어 있으므로, 도 3a와 같이 서로 반대쪽으로 휘어지면서 배열된다. 따라서, 단위화소내에는 서로 두 방향을 취하는 이중 도메인(D1,D2)이 형성된다.Then, before the electric field is formed, the liquid crystal molecules 20a are arranged to be perpendicular to the surfaces of the inclined structures 12a, 12b, 17a, and 17b. In this case, since at least one inclined structure per unit pixel is arranged to be symmetrical, it is arranged while being bent in opposite directions as shown in FIG. 3A. Therefore, the dual domains D1 and D2 are formed in the unit pixels, which take two directions with each other.
이에따라, 편광자를 통하여 직선 편광된 광은 액정(20)을 지나면서 편광 상태가 바뀌어서 분해자를 통과하게 된다. 이때, 이중 도메인(D1,D2)이 형성되므로, 액정 분자의 굴절율 이방성이 보상되어, 컬러 쉬프트 및 시야각을 넓힐 수 있다.Accordingly, the linearly polarized light through the polarizer changes the polarization state while passing through the liquid crystal 20 to pass through the decomposer. In this case, since the dual domains D1 and D2 are formed, the refractive index anisotropy of the liquid crystal molecules may be compensated, thereby widening the color shift and the viewing angle.
한편, 화소 전극(11)과 상대 전극(16) 사이에 전계(E)형성되면, 액정 분자(20a)들은 경사 구조물(12a,12b,17a,17b)과 상관없이 화소 전극(11) 및 상대 전극(16)의 표면에 법선 형태로 배열된다(유전율 이방성이 양인 액정을 사용했을 경우).On the other hand, when the electric field E is formed between the pixel electrode 11 and the counter electrode 16, the liquid crystal molecules 20a are irrespective of the inclined structures 12a, 12b, 17a, and 17b. It is arranged in the normal form on the surface of (16) (when using the liquid crystal which has a positive dielectric anisotropy).
따라서, 편광자를 통과한 광은 액정(20)을 통과하면서 편광 상태가 변화되지 않아, 분해자를 통과하지 못한다.Therefore, the light passing through the polarizer does not change the polarization state while passing through the liquid crystal 20, and thus cannot pass through the decomposer.
본 실시예에서는 단위화소당 하나의 경사 구조물을 형성하였을 경우와 단위화소당 두 개의 경사 구조물을 형성하였을 경우를 설명하였다. 하지만, 상기 실시예에 국한되지 않고, 다수개의 경사 구조물을 형성하여 멀티 도메인을 형성할 수 있다.In this embodiment, the case where one inclined structure is formed per unit pixel and the case where two inclined structures are formed per unit pixel are described. However, the present invention is not limited to the above embodiment, and a plurality of inclined structures may be formed to form a multi domain.
이상에서 자세히 설명된 바와 같이, 본 발명에 의하면, 전극 상부에 적어도 하나 이상의 경사 구조물을 대칭적으로 배치시키므로써, 별도의 프리틸트각을 부여하지 않고도 액정 분자들을 휘어지도록 배열시킨다.As described in detail above, according to the present invention, by arranging at least one or more inclined structures on the electrode symmetrically, the liquid crystal molecules are arranged to bend without giving a separate pretilt angle.
이에따라, 별도의 러빙 공정이 요구되지 않는다.Accordingly, no separate rubbing process is required.
또한, 두 개이상의 경사 구조물을 대칭적으로 배치시켰을 경우, 멀티 도메인을 형성할 수 있어, 컬러 쉬프트 현상을 방지하고, 시야각을 넓힐 수 있다.In addition, when two or more inclined structures are arranged symmetrically, multi-domains can be formed, thereby preventing color shift and widening the viewing angle.
기타, 본 발명은 그 요지를 일탈하지 않는 범위에서 다양하게 변경하여 실시할 수 있다. In addition, this invention can be implemented in various changes within the range which does not deviate from the summary.
도 1a 및 도 1b는 종래의 OCB모드의 액정 표시 장치의 단면도.1A and 1B are cross-sectional views of a conventional liquid crystal display in OCB mode.
도 2a 및 도 2b는 본 발명의 일 실시예에 따른 액정 표시 장치의 단면도.2A and 2B are cross-sectional views of a liquid crystal display according to an exemplary embodiment of the present invention.
도 3a 및 도 3b는 본 발명의 다른 실시예에 따른 액정 표시 장치의 단면도.3A and 3B are cross-sectional views of a liquid crystal display according to another exemplary embodiment of the present invention.
(도면의 주요 부분에 대한 부호의 설명)(Explanation of symbols for the main parts of the drawing)
10 : 하부 기판 11 : 화소 전극10 lower substrate 11 pixel electrode
12,12a,12b,17,17a,17b : 경사 구조물12,12a, 12b, 17,17a, 17b: sloped structure
13,18 : 배향막 15 : 상부 기판13,18: alignment layer 15: upper substrate
16 : 상대 전극 20 : 액정16 counter electrode 20 liquid crystal
20a : 액정 분자20a: liquid crystal molecules
Claims (2)
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| KR10-1998-0021950A KR100513650B1 (en) | 1998-06-12 | 1998-06-12 | LCD Display |
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| KR100513650B1 true KR100513650B1 (en) | 2005-12-02 |
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| KR20000040123A (en) * | 1998-12-17 | 2000-07-05 | 김영환 | Liquid crystal display device |
| US7697096B2 (en) | 2003-12-03 | 2010-04-13 | Samsung Electronics Co., Ltd. | Liquid crystal display and panel therefor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0534695A (en) * | 1991-08-02 | 1993-02-12 | Seiko Epson Corp | Liquid crystal display element and manufacture of it |
| JPH06194654A (en) * | 1992-12-24 | 1994-07-15 | Casio Comput Co Ltd | Liquid crystal display element |
| JPH0784244A (en) * | 1993-09-16 | 1995-03-31 | Sharp Corp | Liquid crystal display element and its production |
| JPH09146095A (en) * | 1995-11-17 | 1997-06-06 | Sharp Corp | Liquid crystal display device and its production |
| KR19990052392A (en) * | 1997-12-22 | 1999-07-05 | 김영환 | LCD in Vertical Orientation Mode |
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1998
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0534695A (en) * | 1991-08-02 | 1993-02-12 | Seiko Epson Corp | Liquid crystal display element and manufacture of it |
| JPH06194654A (en) * | 1992-12-24 | 1994-07-15 | Casio Comput Co Ltd | Liquid crystal display element |
| JPH0784244A (en) * | 1993-09-16 | 1995-03-31 | Sharp Corp | Liquid crystal display element and its production |
| JPH09146095A (en) * | 1995-11-17 | 1997-06-06 | Sharp Corp | Liquid crystal display device and its production |
| KR19990052392A (en) * | 1997-12-22 | 1999-07-05 | 김영환 | LCD in Vertical Orientation Mode |
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