JPS5746227A - Liquid crystal indicator - Google Patents

Liquid crystal indicator

Info

Publication number
JPS5746227A
JPS5746227A JP12270880A JP12270880A JPS5746227A JP S5746227 A JPS5746227 A JP S5746227A JP 12270880 A JP12270880 A JP 12270880A JP 12270880 A JP12270880 A JP 12270880A JP S5746227 A JPS5746227 A JP S5746227A
Authority
JP
Japan
Prior art keywords
liquid crystal
layer
contrast
twisted
layers
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.)
Granted
Application number
JP12270880A
Other languages
Japanese (ja)
Other versions
JPH0139084B2 (en
Inventor
Fumiaki Funada
Yutaka Ishii
Masataka Matsuura
Tomio Wada
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP12270880A priority Critical patent/JPS5746227A/en
Publication of JPS5746227A publication Critical patent/JPS5746227A/en
Publication of JPH0139084B2 publication Critical patent/JPH0139084B2/ja
Granted 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
    • G02F1/13471—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 all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • 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

Abstract

PURPOSE:To elevate a display contrast, by reversing the twisted direction of a 2-layer twisted pneumatic liquid crystal cell, between 2 layers, so that the visual angle ranges for giving a contrast after converting the orientation are made to conform to each other, and adequately selecting the product of double refraction DELTAn and layer thickness (d). CONSTITUTION:As for an upper liquid crysral layer 2a and a lower liquid crystal layer 2b, the layer thickness da, db is about 6mum, their twisted directions are reverse to each other, and in the figure, the liquid crystal layer 2a shows twist in the right direction, and the liquid crystal layer 2b shows twist in the left direction. When the orientation processing as shown in the figure is executed, and a tilt angle is selected within the range of about 2-5 deg., both the directions being satisfactory in a contrast of each liquid crystal cell coincide with each other, and the angle of rotation becomes 0 deg. extending over a visible light wavelength range, by 2 layers of liquid crystal, therefore, an interference color in the background is little, and a display contrast becomes satisfactory. As for the product of layer thickness of the liquid crystal layer, and double refraction, it is desirable that it is within the range between 0.36mum and 0.65mum in the respective layers, and the ratio of the respective values is >=0.8 and <=1.2.
JP12270880A 1980-09-03 1980-09-03 Liquid crystal indicator Granted JPS5746227A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12270880A JPS5746227A (en) 1980-09-03 1980-09-03 Liquid crystal indicator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12270880A JPS5746227A (en) 1980-09-03 1980-09-03 Liquid crystal indicator

Publications (2)

Publication Number Publication Date
JPS5746227A true JPS5746227A (en) 1982-03-16
JPH0139084B2 JPH0139084B2 (en) 1989-08-18

Family

ID=14842637

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12270880A Granted JPS5746227A (en) 1980-09-03 1980-09-03 Liquid crystal indicator

Country Status (1)

Country Link
JP (1) JPS5746227A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5790618A (en) * 1980-11-28 1982-06-05 Hitachi Ltd Liquid crystal display element
JPS59128522A (en) * 1983-01-14 1984-07-24 Hitachi Ltd Liquid crystal display device
US5067795A (en) * 1986-03-24 1991-11-26 Gianni Bulgari S.P.A. Adjustable transparency spectacles

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5477358A (en) * 1993-06-21 1995-12-19 Case Western Reserve University Chiral nematic liquid crystal display with homeotropic alignment and negative dielectric anisotropy

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5790618A (en) * 1980-11-28 1982-06-05 Hitachi Ltd Liquid crystal display element
JPH0324652B2 (en) * 1980-11-28 1991-04-03 Hitachi Ltd
JPS59128522A (en) * 1983-01-14 1984-07-24 Hitachi Ltd Liquid crystal display device
US5067795A (en) * 1986-03-24 1991-11-26 Gianni Bulgari S.P.A. Adjustable transparency spectacles

Also Published As

Publication number Publication date
JPH0139084B2 (en) 1989-08-18

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