Method of driving optical modulation device

Details Method of driving optical modulation device Method of driving optical modulation device

1995-06-05

1997-12-09

Chow, Dennis-Doom

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 95, G09G 336

Patent

active

056965265

ABSTRACT:
A liquid crystal apparatus comprises a liquid crystal device including scanning electrodes and signal electrodes intersecting each other, and a chiral smectic liquid crystal disposed therebetween. The chiral smectic liquid crystal assumes a first orientation state when supplied with a pulse voltage of one polarity exceeding a first threshold voltage, a second orientation state when supplied with a pulse voltage of the other polarity exceeding a second threshold voltage, and a third orientation state when released from application of the pulse voltage of one or the other polarity. Drive means periodically applies the scanning selection signal to the scanning electrodes, and controls the application of the scanning selection signal, the scanning non-selection signal and the data signals so as to apply the data signals in synchronism with the scanning selection signal, thereby applying the pulse voltage of one or the other polarity as a combination of the information signal and the one or the other voltage signal of the scanning selection signal to the chiral smectic liquid crystal. Drive means also applies an auxiliary signal in combination with the scanning non-selection signal to suppress a change into the third orientation state of the chiral smectic liquid crystal.

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