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EP0528685A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Ferroelectric liquid crystal display device

Assignee: Sharp Corp
•
Filing: 1992-08-19
•
Granted: —
•
Expires: 2012-08-19
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Abstract

Abstract A ferroelectric liquid crystal display device comprising a substrate (1) of a plurality of scanning electrodes (8) and a plurality of signal electrodes (6) in the form of a matrix, a switching device formed at each intersecting point of the electrodes , a liquid crystal cell injected with a ferroelectric liquid crystal (13) and a drive controlling means which can apply a signal having a polarity opposite to that of the signal corresponding to a required display from the signal electrode (6) in synchronization with the signal that is applied from the scanning electrode (8) to turn the switching device ON; apply a signal corresponding to the required display from the signal electrode (6) in synchronization with the signal that is applied again from the scanning electrode (8) after a predetermined period of time to turn the switching device ON; and apply a signal from the signal electrode (6) so that the voltage applied to the liquid crystal device may be zero in synchronization with the signal that is applied again from the scanning electrode (8) after a predetermined period of time to turn the switching device ON.

Inventors

  • 👤 Mitsu Hiro Koden

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 09:09
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3648; G09G3/3651; G02F1/13; G02F1/137; G09G2310/00; G09G2310/06; G09G2320/00; G09G2320/02; G09G2320/028

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 191 words
A ferroelectric liquid crystal display device comprising a substrate (1) of a plurality of scanning electrodes (8) and a plurality of signal electrodes (6) in the form of a matrix, a switching device formed at each intersecting point of the electrodes , a liquid crystal cell injected with a ferroelectric liquid crystal (13) and a drive controlling means; wherein said drive controlling means can apply a signal having a polarity opposite to that of the signal corresponding to a required display from the signal electrode (6) in synchronization with that the signal is applied from the scanning electrode (8) to turn the switching device ON; apply a signal corresponding to the required display from the signal electrode (6) in synchronization with the signal that is applied again from the scanning electrode (8) after a predetermined period of time to turn the switching device ON; and apply a signal from the signal electrode so that the voltage applied to the liquid crystal (13) may be zero in synchronization with that the signal is applied again from the scanning electrode (8) after a predetermined period of time to turn the switching device ON.
Claim 2
Dependent Claim 18 words
A liquid crystal display device according to claim 1, wherein said switching device is a thin film transistor.
Claim 3
Dependent Claim 42 words
A liquid crystal display device according to claim 1, wherein said ferroelectric liquid crystal (13) forms a liquid crystal layer of a chevron structure showing uniform orientation in which doglegged direction in the chevron structures is the same as a rubbing axis.

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