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Patent EP0434033A2 successfully refreshed from Google Patents.
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EP0434033A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal display device

Assignee: Seiko Epson Corp
•
Filing: 1990-12-19
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Granted: —
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Expires: 2010-12-19
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Abstract

Abstract A liquid crystal display device comprises a liquid crystal panel (201) provided with a pair of substrates (202, 203) sandwiching a liquid crystal layer therebetween, a scanning electrode group (Y1-Y6) on one of said substrates, a signal electrode group (X1-X6) on the other of said substrates, a pixel being formed at each crossing point between a scanning electrode and a signal electrode, and means (205, 213) for applying a scanning voltage wave to at least one end of said scanning electrode group and for applying a signal voltage wave to at least one end of said signal electrode group to display images and characters (display pattern) and for superimposing a correcting voltage to the scanning voltage wave and/or the signal voltage wave in accordance with the display pattern. Additional means (104) are provided for varying the value and/or the time of application of said correcting voltage in accordance with the pixel positions from said at least one end of said scanning electrode group and/or in accordance with the pixel positions from said at least one end of the signal electrode group. Thereby the evenness of the display can be remarkably improved.

Inventors

  • 👤 Yamazaki C/O Seiko Epson Corporation Katsunori

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 01:09
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3674; G09G3/3681; G09G2320/00; G09G2320/02; G09G2320/0209; G09G2320/04; G09G2320/041

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 182 words
A liquid crystal display device, comprising: a liquid crystal panel (201; 801) provided with a pair of substrates (202, 203) sandwiching a liquid crystal layer therebetween, a scanning electrode group (Y1-Y6) on one of said substrates, a signal electrode group (X1-X6) on the other of said substrates, a pixel being formed at each crossing point between a scanning electrode and a signal electrode, means (205, 213; 905, 213) for applying a scanning voltage wave to at least one end of said scanning electrode group and for applying a signal voltage wave to at least one end of said signal electrode group to display images and characters (display pattern) and for superimposing a correcting voltage to the scanning voltage wave and/or the signal voltage wave in accordance with the display pattern, and means (104; 804) for varying the value and/or the time of application of said correcting voltage in accordance with the pixel positions from said at least one end of said scanning electrode group and/or in accordance with the pixel positions from said at least one end of the signal electrode group.
Claim 2
Dependent Claim 40 words
The liquid crystal display device according to claim 1, wherein the value and/or the application time of said correcting voltage is selectively varied for each electrode of said scanning electrode group and/or for each electrode of said signal electrode group.
Claim 3
Dependent Claim 95 words
The liquid crystal display device according to claim 2, wherein a selective voltage is successively and periodically applied to each electrode of said scanning electrode group (Y1-Y6), a non-selective voltage being applied to the other electrodes of said scanning electrode group, and wherein said correcting voltage is superimposed on the non-selective voltage, the voltage times time area of the correcting voltage being separately controlled for each scanning electrode (Y1-Y6) depending on the display pattern and the distance between the respective scanning electrode and said at least one driving end of the signal electrode group (X1-X6).
Claim 4
Dependent Claim 86 words
The liquid crystal display device according to claim 2 or 3, wherein a selective voltage is successively and periodically applied to each scanning electrode (Y1-Y6), the correcting voltage being superimposed on said selective voltage and the voltage times time area of the correcting voltage being individually controlled for each scanning electrode depending on the lighting or non-lighting status of the pixels on a respective scanning electrode and the distance between each of said pixels and said at least one driving end of the scanning electrode group.

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