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KR970007426A - Ferroelectric Nematic Liquid Crystal Display - Google Patents

Ferroelectric Nematic Liquid Crystal Display Download PDF

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Publication number
KR970007426A
KR970007426A KR1019950021314A KR19950021314A KR970007426A KR 970007426 A KR970007426 A KR 970007426A KR 1019950021314 A KR1019950021314 A KR 1019950021314A KR 19950021314 A KR19950021314 A KR 19950021314A KR 970007426 A KR970007426 A KR 970007426A
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South Korea
Prior art keywords
liquid crystal
crystal display
substrates
display device
crystal layer
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KR1019950021314A
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Korean (ko)
Inventor
윤종용
삼성전관 주식회사
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윤종용
삼성전관 주식회사
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Priority to KR1019950021314A priority Critical patent/KR970007426A/en
Priority to GB9615197A priority patent/GB2303464A/en
Priority to CN96112274A priority patent/CN1165311A/en
Priority to DE19629551A priority patent/DE19629551A1/en
Priority to JP8192230A priority patent/JPH0933957A/en
Publication of KR970007426A publication Critical patent/KR970007426A/en

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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
    • G02F1/137—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
    • G02F1/141—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 using ferroelectric liquid crystals
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • 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
    • G02F1/1396—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 liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell

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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)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)

Abstract

본 발명은 액정 표시 장치에 관한 것으로서, 더욱 상세하게는, 강유전성 네마틱 액정 물질을 이용한 액정 표시 장치에 관한 것이다. 본 발명은 전압이 인가될 수 있는 두 투명 기판의 사이에 강유전성 네마틱 액정 물질, 특히 액정 방향자에 평행한 자발 분극을 가지는 강유전성 네마틱 액정 물질로 된 액정층으로 이루어져 있다. 특히 이 액정 물질이 양의 유전을 이방성을 가지는 경우에는, 전기장에 평행하려는 액정 자체의 성질과 영구 분극에 의한 효과가 중첩되어 일반적으로 네마틱 액정보다 작은 전기장으로도 액정을 구동할 수 있으며, 종래의 강유전성 스멕틱 C*액정에서 문제점으로 지적되고 있는 배향의 문제도 쉽사리 해결할 뿐 아니라, 동작 속도 또한 빨라진다.The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device using a ferroelectric nematic liquid crystal material. The present invention consists of a liquid crystal layer made of a ferroelectric nematic liquid crystal material, in particular a ferroelectric nematic liquid crystal material having spontaneous polarization parallel to the liquid crystal director, between two transparent substrates to which voltage can be applied. In particular, when the liquid crystal material has a positive dielectric anisotropy, the property of the liquid crystal itself to be parallel to the electric field and the effect of permanent polarization overlap, so that the liquid crystal can be driven with an electric field generally smaller than the nematic liquid crystal. The problem of orientation, which has been pointed out as a problem in ferroelectric Smectic C * liquid crystal, is not only easily solved, but also the operation speed is increased.

Description

강유전성 네마틱 액정 표시 장치Ferroelectric Nematic Liquid Crystal Display

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제1도(가) 및 (나)는 종래 기술 및 본 발명의 실시예에 따른 액정 표시장치의 단면도로서, (가)는 "OFF" 상태를 나타낸 것이고, (나)는 "ON" 상태를 나타낸 것이며, 제2도는 본 발명의 실시예에 따른 액정 표시 장치에서 인가된 전압에 따른 빛의 투과율의 변화를 나타낸 그래프이다.1 (a) and (b) are cross-sectional views of a liquid crystal display according to a prior art and an embodiment of the present invention, (a) shows an "OFF" state, and (b) shows an "ON" state. 2 is a graph showing a change in light transmittance according to a voltage applied in a liquid crystal display according to an exemplary embodiment of the present invention.

Claims (18)

전압이 인가될 수 있는 한쌍의 투명 기판, 그리고 상기 두 기판의 사이에 있는 강유전성 네마틱 액정 물질로 된 액정층을 포함하는 액정 표시 장치.A liquid crystal display comprising a pair of transparent substrates to which a voltage can be applied, and a liquid crystal layer of ferroelectric nematic liquid crystal material between the two substrates. 제1항에서, 상기 액정층의 액정 물질은 액정 방향자와 평행한 자발 분극을 가지고 있는 강유전성 네마틱 물질인 액정 표시 장치.The liquid crystal display of claim 1, wherein the liquid crystal material of the liquid crystal layer is a ferroelectric nematic material having spontaneous polarization parallel to the liquid crystal director. 제2항에서, 상기 액정층의 물질은 양의 유전율 이방성을 가지고 있는 액정 표시 장치.The liquid crystal display of claim 2, wherein the material of the liquid crystal layer has a positive dielectric anisotropy. 제1항 내지 제3항 중 어느 한 항에서, 상기 두 기판은 수평 배향 처리되어 있는 액정 표시 장치.The liquid crystal display device of claim 1, wherein the two substrates are horizontally aligned. 제4항에서, 상기 두 기판의 수평 배향 방향은 0 내지 360°어긋나 있어 그 각도만큼 액정 방향자가 회전해 있는 액정 표시 장치.5. The liquid crystal display of claim 4, wherein the horizontal alignment directions of the two substrates are shifted by 0 to 360 ° such that the liquid crystal director is rotated by the angle. 제1항 내지 제3항 중 어느 한 항에서, 상기 액정층의 피치 조절을 위하여 상기 액정층에 카이랄 첨가제가 포함되어 있는 액정 표시 장치.The liquid crystal display device according to claim 1, wherein a chiral additive is included in the liquid crystal layer to adjust the pitch of the liquid crystal layer. 제6항에서, 상기 액정 물질의 액정 방향자는 상기 액정층 전체를 통하여 0 내지 360°회전해 있는 액정 표시 장치.The liquid crystal display of claim 6, wherein the liquid crystal director of the liquid crystal material is rotated from 0 to 360 ° through the entire liquid crystal layer. 제5항 또는 제7항에 있어서, 상기 두 기판 사이의 간격을 상기 액정층의 피치로 나눈 값이 0.0에서 1.0사이인 액정 표시 장치.The liquid crystal display device according to claim 5 or 7, wherein a value obtained by dividing the distance between the two substrates by the pitch of the liquid crystal layer is between 0.0 and 1.0. 제8항에서, 상기 두 기판 사이의 간격과 상기 액정층의 피치의 비가 1 : 4인 액정 표시 장치.The liquid crystal display of claim 8, wherein a ratio of the interval between the two substrates and the pitch of the liquid crystal layer is 1: 4. 제9항에서, 상기 액정층의 액정 물질의 광학적 이방성과 상기 기판 사이의 간격의 곱이 0.1에서 2.0㎛인 액정 표시 장치.The liquid crystal display of claim 9, wherein a product of the optical anisotropy of the liquid crystal material of the liquid crystal layer and the gap between the substrates is 0.1 to 2.0 μm. 제5항, 제7항 또는 제9항에 있어서, 상기 두 기판에 각각 부착되어 있는 편광자를 더 포함하는 액정 표시 장치.10. The liquid crystal display device according to claim 5, 7, or 9, further comprising polarizers respectively attached to the two substrates. 제11항에서, 상기 두 편광자의 편광축은 상기 액정층의 액정 분자의 회전 각도만큼 어긋나 있는 액정 표시 장치.The liquid crystal display of claim 11, wherein the polarization axes of the two polarizers are shifted by a rotation angle of the liquid crystal molecules of the liquid crystal layer. 제11항에서, 상기 두 편광자의 평광축은 상기 액정층의 액정 분자의 회전 각도에 ±90°더한 각도만큼 어긋나 있는 액정 표시 장치.The liquid crystal display of claim 11, wherein the planar axis of the two polarizers is shifted by an angle of ± 90 ° to the rotation angle of the liquid crystal molecules of the liquid crystal layer. 제11항에서, 상기 두 편광자의 편광축은 서로 평행한 액정 표시 장치.The liquid crystal display of claim 11, wherein the polarization axes of the two polarizers are parallel to each other. 제11항에서, 상기 두 편광자의 편광축은 서로 직교하는 액정 표시 장치.The liquid crystal display of claim 11, wherein the polarization axes of the two polarizers are perpendicular to each other. 제1항 내지 제3항, 제5항 및 제7항 중 어느 한 항에서, 상기 두 기판 중 한 기판 또는 두 기판 모두에 위상차판이 부착되어 있는 액정 표시 장치.The liquid crystal display device according to any one of claims 1 to 3, 5 and 7, wherein a retardation plate is attached to one or both of the two substrates. 제1항 내지 제3항, 제5항 및 제7항 중 어느 한 항에서, 상기 두 기판 중 한 기판에 빛을 발하는 발광 수단이 부착되어 있는 액정 표시 장치.The liquid crystal display device according to any one of claims 1 to 3, 5 and 7, wherein light emitting means for emitting light is attached to one of the two substrates. 제1항 내지 제3항, 제5항 및 제7항 중 어느 한 항에서, 상기 두 기판 중 한 기판에 반사판이 부착되어 있는 액정 표시 장치.The liquid crystal display device according to any one of claims 1 to 3, 5 and 7, wherein a reflecting plate is attached to one of the two substrates. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019950021314A 1995-07-20 1995-07-20 Ferroelectric Nematic Liquid Crystal Display KR970007426A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1019950021314A KR970007426A (en) 1995-07-20 1995-07-20 Ferroelectric Nematic Liquid Crystal Display
GB9615197A GB2303464A (en) 1995-07-20 1996-07-19 Ferroelectric nematic liquid crystal display
CN96112274A CN1165311A (en) 1995-07-20 1996-07-20 Ferroelectric Nematic Liquid Crystal Display
DE19629551A DE19629551A1 (en) 1995-07-20 1996-07-22 Ferroelectric nematic liquid crystal display
JP8192230A JPH0933957A (en) 1995-07-20 1996-07-22 Liquid-crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019950021314A KR970007426A (en) 1995-07-20 1995-07-20 Ferroelectric Nematic Liquid Crystal Display

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KR970007426A true KR970007426A (en) 1997-02-21

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JP (1) JPH0933957A (en)
KR (1) KR970007426A (en)
CN (1) CN1165311A (en)
DE (1) DE19629551A1 (en)
GB (1) GB2303464A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19980033499A (en) * 1998-04-18 1998-07-25 이신두 Reflective liquid crystal display with twisted nematic hybrid orientation
KR19990027489A (en) * 1997-09-30 1999-04-15 윤종용 Vertically oriented twisted nematic liquid crystal display with ferroelectric liquid crystal
KR100683646B1 (en) * 2000-04-06 2007-02-20 삼성에스디아이 주식회사 A smart card having a display unit using ferroelectric liquid crystal
KR101333614B1 (en) * 2010-06-25 2013-11-27 엘지디스플레이 주식회사 Liquid crystal display device

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100320102B1 (en) * 1998-11-21 2002-04-22 김원대 Vertically Aligned Helix-Deformed Liquid Crystal Display
CN104520763B (en) 2012-06-25 2017-12-05 汉阳大学校产学协力团 Liquid crystal display device
WO2014003399A1 (en) * 2012-06-25 2014-01-03 한양대학교 산학협력단 Liquid crystal composition
KR20140001071A (en) 2012-06-25 2014-01-06 한양대학교 산학협력단 Liquid crystal compound
CN106773154A (en) * 2016-11-22 2017-05-31 福州大学 A kind of liquid crystal director rapid measurement device and its implementation
EP4256001A1 (en) 2020-12-02 2023-10-11 Merck Patent GmbH Ferroelectric nematic liquid crystalline medium
CN116507694A (en) 2020-12-02 2023-07-28 默克专利股份有限公司 Liquid crystal compound
US20250013114A1 (en) * 2021-11-10 2025-01-09 The Regents Of The University Of Colorado, A Body Corporate Mixture including ferroelectric nematic phase and methods of forming and using same
WO2023133356A2 (en) * 2022-01-10 2023-07-13 The Regents Of The University Of Colorado, A Body Corporate Composite materials based on ferroelectric nematic liquid crystals and devices including same
TW202411403A (en) 2022-05-31 2024-03-16 德商馬克專利公司 Ferroelectric nematic liquid crystalline medium
US20240094584A1 (en) * 2022-09-06 2024-03-21 Meta Platforms Technologies, Llc Optical dimming devices with chiral ferroelectric nematic liquid crystal
CN117331260B (en) * 2023-11-20 2024-06-14 南京邮电大学 Method for realizing microsecond electro-optic response of low driving electric field in ferroelectric nematic liquid crystal

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61137127A (en) * 1984-12-07 1986-06-24 Hitachi Ltd Liquid crystal display element
JPS62194224A (en) * 1986-02-20 1987-08-26 Sharp Corp Twisted nematic type liquid crystal display element
JP2551848B2 (en) * 1989-07-25 1996-11-06 セイコープレシジョン株式会社 Ferroelectric liquid crystal panel
US5539555A (en) * 1990-07-20 1996-07-23 Displaytech, Inc. High contrast distorted helex effect electro-optic devices and tight ferroelectric pitch ferroelectric liquid crystal compositions useful therein

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR19990027489A (en) * 1997-09-30 1999-04-15 윤종용 Vertically oriented twisted nematic liquid crystal display with ferroelectric liquid crystal
KR19980033499A (en) * 1998-04-18 1998-07-25 이신두 Reflective liquid crystal display with twisted nematic hybrid orientation
KR100683646B1 (en) * 2000-04-06 2007-02-20 삼성에스디아이 주식회사 A smart card having a display unit using ferroelectric liquid crystal
KR101333614B1 (en) * 2010-06-25 2013-11-27 엘지디스플레이 주식회사 Liquid crystal display device

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GB9615197D0 (en) 1996-09-04
CN1165311A (en) 1997-11-19
JPH0933957A (en) 1997-02-07
GB2303464A (en) 1997-02-19
DE19629551A1 (en) 1997-01-23

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