KR970706519A - VIEWING ANGLE ENHANCEMENT FOR VERTICALLY ALIGNED CHOLESTERIC LIQUID CRYSTAL DISPLAYS - Google Patents

VIEWING ANGLE ENHANCEMENT FOR VERTICALLY ALIGNED CHOLESTERIC LIQUID CRYSTAL DISPLAYS

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KR970706519A
KR970706519A KR1019970702096A KR19970702096A KR970706519A KR 970706519 A KR970706519 A KR 970706519A KR 1019970702096 A KR1019970702096 A KR 1019970702096A KR 19970702096 A KR19970702096 A KR 19970702096A KR 970706519 A KR970706519 A KR 970706519A
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liquid crystal
layer
display
electrode
oriented
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KR1019970702096A
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KR100339471B1 (en
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브루스 케이. 윙커
레오나드 지. 헤일
도널드 비. 테이버
윌리엄 제이. 거닝 Ⅲ
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존 제이. 데인켄
로크웰 인터내셔널 코포레이션
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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
    • 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
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • 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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells

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

Abstract

수직 배향 콜레스테릭 액정 디스플레이 시스템(500)은 시야각에 대해 크게 변화하는 고콘트라스트비 및 계조 트랜스미션을 제공한다. 본 발명의 디스플레이는 광학 보상기 및 디스플레이의 계조 안정성을 개선시키는 새로운 셀 설계를 포함한다. 디스플레이 보상기는 네가티브 C-판(510) 및 포지티브 A-판(550)으로 구성된다. A-판은 디스플레이의 편광자 트랜스미션축을 따라 배향된다. 이러한 보상기를 이용하여 얻어지는 시야각은 크로스된 편광자 자체만의 시야각보다 훨씬 넓어진다. 디스플레이의 액정셀 설계는 상두께가 비교적 작은 2개의 경사 도메인을 포함한다. 액정 키랄 도판트 농도는 0.2-0.32의 셀갭 대 피치비를 제공하도록 조정된다. 디스플레이 편광자(505,555)는 45°및 135°로 배향되며, 평균 액정 디렉터는 90°로 배향된다. 각 화소전극(525,540)은 액티브 화소 영역내에 측면 전계를 제공하는 수평 스트라이프를 포함한다. 측면 전계는 액정 분자들을 대략 90°및 270°로 반대 방향으로 배향된 2개의 경사 도메인들로 분리한다. 상기 결과의 계조 반응은 다른 경사 도메인들에서의 반응이 전체화소에 걸쳐 평균화되기 때문에 각 화소에서 재생 가능하고 시야각이 비교적 균일하게 된다. 또한, 측면전계는 전위가 먼저 셀에 인가되어, 디스플레이의 턴-온 지연 시간을 감소시킬때 존재하는 불안정성을 제거한다.The vertically-aligned cholesteric liquid crystal display system 500 provides a high contrast ratio and gradation transmission that varies greatly with respect to the viewing angle. The display of the present invention includes a novel cell design that improves the gradation stability of optical compensators and displays. The display compensator consists of a negative C-plate 510 and a positive A-plate 550. The A-plate is oriented along the polarizer transmission axis of the display. The viewing angle obtained with this compensator is much wider than the viewing angle of the crossed polarizer itself. The liquid crystal cell design of the display includes two gradient domains with relatively small phase thicknesses. The liquid crystal chiral dopant concentration is adjusted to provide a cell gap to pitch ratio of 0.2-0.32. The display polarizers 505,555 are oriented at 45 ° and 135 °, and the average liquid crystal director is oriented at 90 °. Each pixel electrode 525, 540 includes a horizontal stripe that provides a lateral electric field within the active pixel region. The lateral electric field separates the liquid crystal molecules into two inclined domains oriented in opposite directions at approximately 90 and 270 degrees. The resultant gradation response is reproducible in each pixel and the viewing angle becomes relatively uniform since the reactions in the different graded domains are averaged over all the pixels. In addition, the side field eliminates the instability that exists when the potential is first applied to the cell to reduce the turn-on delay time of the display.

Description

수직 배향 콜레스테릭 액정 디스플레이의 시야각 향상(VIEWING ANGLE ENHANCEMENT FOR VERTICALLY ALIGNED CHOLESTERIC LIQUID CRYSTAL DISPLAYS)VIEWING ANGLE ENHANCEMENT FOR VERTICALLY ALIGNED CHOLESTERIC LIQUID CRYSTAL DISPLAYS

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is a trivial issue, I did not include the contents of the text.

제5도는 본 발명에 따른 수직 배향 콜레스테릭 디스플레이셀의 단면도, 제6도는 제5도의 전극 구조의 확대평면도, 및 제7도는 제5도의 액정 디스플레이셀의 확대 단면도이다.FIG. 5 is a cross-sectional view of the vertically-aligned cholesteric display cell according to the present invention, FIG. 6 is an enlarged plan view of the electrode structure of FIG. 5, and FIG. 7 is an enlarged sectional view of the liquid crystal display cell of FIG.

Claims (10)

(a) 다수의 층표면들에 의해 한정되는 액정층으로서; (1)(A) 가티브 유전 이방성, (B) 약 1.5 이하의 K33/K11탄성정수비, (C) 및 약 300-500nm 사이의 상지연을 가지며; (2) 다수의 액정분자를 포함하고, 상기 층표면들에 인접한 액정 분자가 호메오트로피컬형으로 배향되며; (3) 약 0.2-0.35 사이의 셀갭 대 피치비를 얻기에 충분한 농도의 키랄 도판트를 더 포함하며; (4)(a) 상기 액정 분자가 다수의 경사 도메인으로 구성되는 액정층; (b) 상기 액정층의 제1주면에 인접한 제1전극; (c) 상기 액정층의 제2주면에 인접하고, 전위 소스에 접속될때 상기 제1전극과 함께 상기 액정층에 걸쳐 전계를 인가하게 되는 제2전극; 및 (d) 상기 전계에 대해 하나 이상의 측면 성분들을 제공하는 다수의 불연속점들을 포함하며, 상기 하나 이상의 측면 성분들은 각각 상기 경사 도메인들 중 적어도 하나에 대한 방위를 한정하는 상가 제1전극과 제2전국 중 하나 또는 모두를 포함하는, 액정 디스플레이의 액정셀.(a) a liquid crystal layer defined by a plurality of layer surfaces; (A) a dielectric anisotropy, (B) a K 33 / K 11 elastic constant ratio of about 1.5 or less, (C) and a phase delay between about 300-500 nm; (2) a plurality of liquid crystal molecules, wherein liquid crystal molecules adjacent to the layer surfaces are oriented in a homeotropic manner; (3) a chiral dopant of sufficient concentration to obtain a cell gap to pitch ratio of between about 0.2-0.35; (4) A liquid crystal display comprising: (a) a liquid crystal layer in which the liquid crystal molecules are constituted by a plurality of inclined domains; (b) a first electrode adjacent to a first major surface of the liquid crystal layer; (c) a second electrode adjacent to a second main surface of the liquid crystal layer and adapted to apply an electric field across the liquid crystal layer together with the first electrode when connected to a potential source; And (d) a plurality of discontinuities providing one or more lateral components for the electric field, wherein the one or more side components each have a first valence first electrode defining an orientation relative to at least one of the tilt domains, A liquid crystal cell of a liquid crystal display comprising one or both of the whole country. (a) 다수의 층표면들에 의해 한정되며 네가티브 유전 이방성을 갖는 액정층으로서; (1) 다수의 경사 도메인들로 구성되어, 상기 층표면들에 인접한 액정 분자가 호메오트로피컬형으로 배향되는 다수의 액정 분자; (2) 약 0.2-0.35 사이의 셀갭 대 피치비를 얻기에 충분한 농도의 키랄 도판트를 포함하는 액정층; (b) 상기 액정층의 제1주면에 인접한 제1전극; 및 (c) 상기 액정층의 제2주면에 인접하고, 전위 소스에 접속될때 상기 제1전극과 함께 상기 액정츠에 걸쳐 전압을 인가하게 되는 제2전극을 포함하는 액정 디스플레이의 액정셀.(a) a liquid crystal layer defined by a plurality of layer surfaces and having negative dielectric anisotropy; (1) a plurality of liquid crystal molecules composed of a plurality of tilted domains, wherein liquid crystal molecules adjacent to the layer surfaces are oriented in a homeotropic manner; (2) a liquid crystal layer comprising a chiral dopant of sufficient concentration to obtain a cell gap to pitch ratio of between about 0.2-0.35; (b) a first electrode adjacent to a first major surface of the liquid crystal layer; And (c) a second electrode adjacent to a second major surface of the liquid crystal layer and adapted to apply a voltage across the liquid crystal with the first electrode when connected to a potential source. 제2항에 있어서, 상기 제1전극과 제2전극 중 하나 또는 그들이 상기 전계에 대해 하나 이상의 측면 성분들을 제공하는 하나 이상의 불연속점들을 포함하는 액정 디스플레이 액정셀.3. The liquid crystal display liquid crystal cell according to claim 2, wherein one of the first electrode and the second electrode or one or more discontinuities at which they provide one or more side components with respect to the electric field. 제3항에 있어서, 상기 경사 도메인들의 방위는 상기 측면 성분들에 의해 상기 전계에 대해 한정되는 액정 디스플레이의 액정셀.4. The liquid crystal cell of claim 3, wherein the orientation of the tilt domains is defined with respect to the electric field by the side components. 제3항 또는 4항에 있어서, 상기 층표면에 인접한 액정분자들이 호메오트로피컬형으로 배향되는 액정 디스플레이의 액정셀.The liquid crystal cell according to claim 3 or 4, wherein the liquid crystal molecules adjacent to the layer surface are oriented in a homeotropic manner. 제2항에 있어서, 상기 액정층의 상지연은 약 300-550nm 사이인 액정 디스플레이의 액정셀.3. The liquid crystal cell of claim 2, wherein the phase delay of the liquid crystal layer is between about 300-550 nm. 제2항에 있어서, 상기 액정 디스플레이가 노멀리 블랙 디스플레인 액정 디스플레이의 액정셀.The liquid crystal cell of claim 2, wherein the liquid crystal display is a normally black display. 제2항에 있어서, 상기 액정층의 K33/K11탄성정수비가 약 1.5 이하인 약정 디스플레이의 액정셀.The liquid crystal cell of claim 2, wherein the K 33 / K 11 elastic constant ratio of the liquid crystal layer is about 1.5 or less. (a) 편광자 층; (b) 검광자 층; (c) 청구항 1,2,3,4,5,6,7, 또는 8 중 하나에 따른 액정셀; 및 (d) 상기 편광자와 검광자 사이에 배치되어 하나 이상의 네가티브 복굴절 C-판 층을 포함하는 하나 이상의 보상층을 포함하는 액정 디스플레이.(a) a polarizer layer; (b) an analyzer layer; (c) a liquid crystal cell according to any one of claims 1, 2, 3, 4, 5, 6, 7, or 8; And (d) at least one compensation layer disposed between the polarizer and analyzer and comprising at least one negative birefringent C-plate layer. 제9항에 있어서, 상기 보상층이 하나 이상의 포지티브 복굴절 A-판 층을 더 포함하는 액정 디스플레이.10. The liquid crystal display of claim 9, wherein the compensation layer further comprises at least one positive birefringent A-plate layer. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: It is disclosed by the contents of the first application.
KR1019970702096A 1994-09-30 1995-09-28 Viewing angle enhancement for vertically aligned cholesteric liquid crystal displays KR100339471B1 (en)

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US31347894A 1994-09-30 1994-09-30
US08/313,478 1994-09-30
PCT/US1995/012499 WO1996010774A1 (en) 1994-09-30 1995-09-28 Viewing angle enhancement for vertically aligned cholesteric liquid crystal displays

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KR100495795B1 (en) * 1997-12-05 2005-09-30 삼성전자주식회사 Liquid crystal display
KR100590744B1 (en) * 1998-10-30 2006-10-13 삼성전자주식회사 A color filter substrate, a manufacturing method thereof, and a liquid crystal display including the color filter substrate.

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GB2321529A (en) 1997-01-24 1998-07-29 Sharp Kk Broadband cholesteric optical device
US6061108A (en) * 1997-01-24 2000-05-09 Sharp Kabushiki Kaisha Broadband cholesteric polarizer and an optical device employing the same
JPH10319235A (en) * 1997-05-16 1998-12-04 Nitto Denko Corp Polarizing element, lighting device, and liquid crystal display device
AU6912798A (en) * 1997-06-10 1998-12-30 Lg. Philips Lcd Co., Ltd. Liquid crystal display with wide viewing angle and method for making it
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