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EP0349415A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method and device for controlling a matrix screen displaying gray levels

Assignee: Commissariat à l'Énergie Atomique et Aux Énergies Alternatives
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Filing: 1989-06-27
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Granted: —
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Expires: 2009-06-27
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Abstract

Abstract Translated from French Selon l'invention, on envoie sur les colonnes de l'écran, au cours du temps de ligne T, des signaux d'activation pendant un temps qui dépend du niveau de gris i du point image considéré et qui vaut (T/N). Nil avec 0≦i≦m≦N, les Nil formant une suite strictement croissante de i, de premier terme nul et de dernier terme inférieur ou égal à N. Les Nil sont choisis de façon à obtenir une répartition déterminée pour les intensités lumineuses des différents niveaux de gris. According to the invention, activation columns are sent to the columns of the screen, during the line time T, for a time which depends on the gray level i of the image point considered and which is equal to (T / N) . Nile with 0 ≦ i ≦ m ≦ N, the Niles forming a strictly increasing sequence of i, with first zero term and last term less than or equal to N. The Niles are chosen so as to obtain a determined distribution for the light intensities of the different levels of gray. Application à la commande d'écrans matriciels à micropointes ou à cristaux liquides. Application to the control of microtip or liquid crystal matrix screens.

Inventors

  • 👤 Anne Ghis

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 21:23
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/22; G09G3/3685; G09G2310/00; G09G2310/02; G09G2310/0264; G09G2310/027; G09G2320/00; G09G2320/06; G09G2320/0693; G09G3/2007; G09G3/2014

Claims Analysis

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References Cited (Backward Citations)

US4193095A Cited
EP0051521A1 Cited
DE3329130A1 Cited
US4554539A Cited
EP0193728A2 Cited
GB2188183A Cited

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