Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1997-12-15
2000-05-02
Chow, Dennis-Doon
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, 349128, G09G 336
Patent
active
060578173
ABSTRACT:
A liquid crystal cell includes scanning and signal electrodes, and a bistable nematic liquid crystal material sealed therein. The material has liquid crystal molecules alignable in first and second metastable aligned states by selective application of twist select voltages smaller than a reset voltage after application of the reset voltage. A tilt angle of the liquid crystal molecules is controlled in the first and second metastable aligned states in accordance with an effective value of a voltage applied between the opposing electrodes. A row driver, in accordance with display data, supplies a reset potential for applying the reset voltage between the electrodes, and a write-period voltage for designating a period for applying a voltage with an effective value according to the display data between the electrodes, to scanning electrodes. A data driver, in accordance with the display data, supplies a metastable-aligned-state selecting voltage for selectively applying a first metastable-aligned-state selecting voltage and a second metastable-aligned-state selecting voltage between the electrodes, and a write voltage corresponding to the voltage with the effective value according to the display data, to the signal electrodes in synchronism with the reset voltage and said write-period voltage.
REFERENCES:
patent: 3837730 (1974-09-01), Hatfield et al.
patent: 4239345 (1980-12-01), Berreman et al.
patent: 5900852 (1999-05-01), Tanaka et al.
Mannoji Toshihiro
Ono Toshiomi
Sato Soichi
Yoshida Tetsushi
Casio Computer Co. Ltd.
Chow Dennis-Doon
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