Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1993-10-21
1995-04-04
Weldon, Ulysses
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
343 90, 343211, G09G 336
Patent
active
054041503
ABSTRACT:
In order to improve the contrast of a liquid crystal display device by the voltage equalization method, scanning side electrodes totaling D in number are scanned in line sequential fashion while applying a voltage between each selected scanning side electrode and each signal side electrode, the voltage applied being controlled in such a way that, during a total of D times of scanning of the scanning side electrodes for production of one frame, when a particular scanning side electrode and a particular signal side electrode are simultaneously in a select state, a voltage Vop is applied to the corresponding liquid crystal, and when the scanning side electrodes respectively are in a non-select state, which occurs the remaining (D-1) times for each of the scanning side electrodes, a voltage whose polarity is reversed in response to the select and non-select states of the signal side electrodes and whose absolute value is represented by .vertline.Vop/B.vertline., where B is the bias ratio, is applied to the corresponding liquid crystal. The bias ratio B can be varied to adjust the contrast of the liquid crystal display device, and it is possible to improve the contrast by increasing the bias ratio.
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Goon Gin
Sharp Kabushiki Kaisha
Weldon Ulysses
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