Method of driving optical modulation device

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

1995-06-05

1999-03-23

Chow, Dennis-Doon

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 96, 345208, G09G 336

Patent

active

058866809

ABSTRACT:
A liquid crystal apparatus comprises a liquid crystal device comprising a group of scanning electrodes and a group of signal electrodes intersecting each other to form an electrode matrix, and a chiral smectic liquid crystal disposed in a non-helical alignment state so as to form a picture element at each intersection of the scanning electrodes and the signal electrodes. Drive means are provided for: (a) applying a scanning selection signal and a scanning non-selection signal to the scanning electrodes, the scanning selection signal comprising a voltage of one polarity and a voltage of the other polarity, respectively with reference to a voltage level of the scanning nonselection signal, and being applied in a period for selecting one scanning electrode, (b) in a period of applying the voltage of one polarity, applying signals to the signal electrodes for causing one orientation state of the chiral smectic liquid crystal, so as to non-selectively erase the picture elements on a scanning electrode to which the scanning selection signal is applied, and (c) periodically applying the scanning selection signal to the scanning electrodes.

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