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EP0433999A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal display

Assignee: Stanley Electric Co Ltd
•
Filing: 1990-12-18
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Granted: —
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Expires: 2010-12-18
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Abstract

Abstract Disclosed is a homeotropic liquid crystal display which comprises a pair of substrates and a nematic liquid crystal layer disposed between the pair of substrate to form a cell. The substrates have tilt orientation directions parallel to each other which are capable of orientating liquid crystal molecules homeotropically or pseudo-homeotropically at an angle range of from 0̸° to about 20̸° . The nematic liquid crystal layer has negative dielectric anisotropy and contains no or a very small amount of chiral molecules. The cell has a response time shorter than the driving frame time, and a small gap and low viscosity so that the liquid crystal layer is not twisted at an "OFF" state but is spontaneously twisted only in an "ON" state in which a pulse voltage is applied to the cell.

Inventors

  • 👤 Jean-Frederic Clerc

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 05:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/139; G02F1/1393; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133742; G02F1/13712; G02F1/1396

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 126 words
A liquid crystal display comprising: a pair of substrates having tilt orientation directions parallel to each other and being capable of orientating liquid crystal molecules homeotropically or pseudo-homeotropically at an angle range of from 0̸° to about 20̸° ; and a layer of nematic liquid crystal molecules disposed between said pair of substrate to form a cell, having negative dielectric anisotropy and containing no or a very small amount of chiral molecules, in which said cell has a response time shorter than the driving frame time and has a small gap and low viscosity so that said liquid crystal layer is not twisted at an "OFF" state but is spontaneously twisted only in an "ON" state in which a pulse voltage is applied to said cell.
Claim 2
Dependent Claim 48 words
A liquid crystal display according to Claim 1, further comprising: a first linear polarizer having a polarization direction parallel to the tilt orientation direction of one of said substrates; and a second linear polarizer having a polarization direction perpendicularly crossing the polarization direction of said first linear polarizer.
Claim 3
Dependent Claim 50 words
A method of driving a liquid crystal display as defined in Claim 1 or 2, said method comprising the steps of applying a constant voltage signal to the liquid crystal layer at the "OFF" time, and applying a voltage pulse signal to the liquid crystal layer at the "ON" time.

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