Method of driving optical modulation device using ferroelectric

Details Method of driving optical modulation device using ferroelectric Method of driving optical modulation device using ferroelectric

1984-04-10

1987-04-07

Corbin, John K.

350333, G02F 113

Patent

active

046555617

ABSTRACT:
A driving method for an optical modualtion device is applicable to driving of an optical modulation device, e.g. a liquid crystal device having a matrix electrode arrangement comprising a group of scanning electrodes, a group of signal electrodes oppositely spaced from the group of scanning electrodes, and an optical modulation material (e.g. a liquid crystal) showing bistability with respect to an electrical field applied thereto disposed between the groups of scanning electrodes and signal electrodes. The driving method is featured by applying a voltage allowing the liquid crystal having bistability to be oriented to a first stable state (one optically stable state) between a selected scanning electrode of the group of scanning electrodes and a selected signal electrode of the group of signal electrodes, and by applying a voltage allowing the liquid crystal having bistability to be oriented to a second stable state (the other optically stable state) between the selected scanning electrodes and non-selected signal electrodes; or by applying a voltage allowing the optical modulation material having bistabity to be oriented to a first stable state between a selected scanning electrode and the group of signal electrodes, applying a voltage allowing the liquid crystal oriented to the first stable state to be oriented to a second stable state between the selected scanning electrode and a selected signal electrode, and applying a voltage set to a value between a threshold voltage -V.sub.th2 (for the second stable state) and a threshold voltage V.sub.th1 (for the first stable state ) between non-selected scanning electrodes and the group of signal electrodes.

REFERENCES:
patent: 4367924 (1983-01-01), Clark et al.
patent: 4419664 (1983-12-01), Crossland et al.
patent: 4508429 (1985-04-01), Nagae et al.
patent: 4529271 (1985-07-01), Berreman et al.
patent: 4548476 (1985-10-01), Kaneko
patent: 4563059 (1986-01-01), Clark et al.

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