Display device including a liquid crystal screen with...

G - Physics – 09 – G

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G09G 3/36 (2006.01)

Patent

CA 2698633

The general field of the invention is that of display devices comprising a liquid-crystal matrix screen composed of elementary pixels, said screen comprising at least a first electrode used as voltage reference and called the "backplane", a second electrode in the form of a matrix electronic network delivering the drive voltages for controlling the pixels and control electronics for said electrodes, said screen being used in the so-called "normally black" mode, that is to say that in the absence of applied voltages, the optical transmission of the pixels is substantially zero. In the device according to the invention, the "backplane" drive voltage is a variable periodic voltage, the amplitude of variation of this voltage being sufficient so that in the absence of voltage on the second electrode, the optical transmission of the pixels is sufficient to be detected by an observer.

Le domaine général de l'invention est celui des dispositifs de visualisation comprenant un écran matriciel à cristaux liquides composé de pixels élémentaires, ledit écran comprenant au moins une première électrode utilisée comme référence de tension et appelée "backplane", une seconde électrode en forme de réseau électronique matriciel délivrant les tensions de commande des pixels et une électronique de commande desdites électrodes, ledit écran étant utilisé dans le mode dit "normaly black", c'est-à-dire qu'en l'absence de tensions appliquées, la transmission optique des pixels est sensiblement nulle. Dans le dispositif selon l'invention, la tension de commande de la "backplane" est une tension périodique variable, l'amplitude de variation de cette tension étant suffisante pour qu'en l'absence de tension sur la seconde électrode, la transmission optique des pixels soit suffisante pour être détectée par un observateur.

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