G - Physics – 09 – G
Patent
G - Physics
09
G
G09G 3/36 (2006.01) G02F 1/1343 (2006.01) G02F 1/1345 (2006.01)
Patent
CA 2275176
A control circuit for providing a common electrode voltage for a liquid crystal display dynamically controls the voltage applied to the common electrode according to various factors that effect the capacitance across the liquid crystal layer. The common electrode control circuit dynamically adjusts the common electrode voltage according to the current maximum and minimum display voltages. In addition, the common electrode control circuit adjusts the common electrode: voltage according to the gate-to-source parasitic capacitance, as well as temperature fluctuations. Thus, the control circuit compensates for the most significant factors which may cause the inadvertent accumulation of a charge across the liquid crystal layer.
La présente invention concerne un circuit de commande fournissant une tension d'électrode commune à un afficheur à cristaux liquides et régulant la tension appliquée à l'électrode commune en fonction de différents facteurs affectant la capacitance dans la totalité de la couche de cristaux liquides. Le circuit de commande d'électrode commune ajuste dynamiquement la tension d'électrode commune en fonction des tensions maximale et minimale courantes d'affichage. En outre, le circuit de commande d'électrode commune ajuste la tension de l'électrode commune en fonction, non seulement de la capacitance parasite grille-à-grille, mais également des fluctuations de température. Cela permet au circuit de commande de corriger les facteurs les plus importants susceptibles de provoquer l'accumulation indésirable de charge dans la totalité de la couche de cristaux liquides.
Dickey Bill A.
Wood Teddy J.
Honeywell Inc.
Smart & Biggar
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