JPS57201218A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPS57201218A
JPS57201218A JP8579481A JP8579481A JPS57201218A JP S57201218 A JPS57201218 A JP S57201218A JP 8579481 A JP8579481 A JP 8579481A JP 8579481 A JP8579481 A JP 8579481A JP S57201218 A JPS57201218 A JP S57201218A
Authority
JP
Japan
Prior art keywords
liquid crystals
liquid crystal
transparent
display device
crystal display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP8579481A
Other languages
Japanese (ja)
Inventor
Niro Motoki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Citizen Holdings Co Ltd
Citizen Watch Co Ltd
Original Assignee
Citizen Holdings Co Ltd
Citizen Watch Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Citizen Holdings Co Ltd, Citizen Watch Co Ltd filed Critical Citizen Holdings Co Ltd
Priority to JP8579481A priority Critical patent/JPS57201218A/en
Publication of JPS57201218A publication Critical patent/JPS57201218A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13476—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which at least one liquid crystal cell or layer assumes a scattering state

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE:To maintain the brightness of a display surface and to increase contrast in a storage type liquid crystal display device by superposing two liquid crystal layers consisting essentially of nematic liquid crystals exhibiting hysteresis characteristics and cholesteric liquid crystals on top and bottom. CONSTITUTION:The liquid crystals 18, 19 obtained by adding cholesteric liquid crystals to mixed liquid crystals of an (n) type nematic liquid crystal and a (p) type nematic liquid crystal are used as the liquid crystals having a storage effect utilizing hysteresis characteristics. Such cells are superposed on top and bottom. The cells have transparent substrates 15, 16, 17 and transparent electrodes 11, 12 and 13, 14 which face to each other are disposed on the transparent substrates. While no voltage is applied, the liquid crystals 18, 19 are transparent and the light transmittances thereof are 80% and the brightness of conventional devices is maintained. When voltage is applied, they assume a light scattering state and the light transmittances drop to 25%. The contrast ratio is increased to 80%/25%, that is, 3.2, which is about 2 times higher than that in the prior art.
JP8579481A 1981-06-05 1981-06-05 Liquid crystal display device Pending JPS57201218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8579481A JPS57201218A (en) 1981-06-05 1981-06-05 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8579481A JPS57201218A (en) 1981-06-05 1981-06-05 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPS57201218A true JPS57201218A (en) 1982-12-09

Family

ID=13868787

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8579481A Pending JPS57201218A (en) 1981-06-05 1981-06-05 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPS57201218A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0259058A2 (en) * 1986-08-20 1988-03-09 Fujitsu Limited Projection-type multi-colour liquid crystal display device
US4941737A (en) * 1987-10-07 1990-07-17 Sharp Kabushiki Kaisha Liquid-crystal display device using twisted nematic liquid crystal molecules
US6781666B2 (en) * 1999-07-16 2004-08-24 Minolta Co., Ltd. Liquid crystal display and method to manufacture the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0259058A2 (en) * 1986-08-20 1988-03-09 Fujitsu Limited Projection-type multi-colour liquid crystal display device
EP0259058B1 (en) * 1986-08-20 1994-02-16 Fujitsu Limited Projection-type multi-colour liquid crystal display device
US4941737A (en) * 1987-10-07 1990-07-17 Sharp Kabushiki Kaisha Liquid-crystal display device using twisted nematic liquid crystal molecules
US6781666B2 (en) * 1999-07-16 2004-08-24 Minolta Co., Ltd. Liquid crystal display and method to manufacture the same

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