Method and apparatus for driving ferroelectric liquid crystal, o

Details Method and apparatus for driving ferroelectric liquid crystal, o Method and apparatus for driving ferroelectric liquid crystal, o

1987-07-21

1988-08-23

Miller, Stanley D.

Communications: electrical

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Internal alarm or indicator responsive to a condition of the...

350341, 350333, 340765, 340804, G02F 113

Patent

active

047657200

ABSTRACT:
An optical modulation device comprises first electrodes and second electrodes disposed opposite to and intersecting with the signal electrodes, and an optical modulation material providing a first and a second orientation state depending on an electric field applied thereto disposed between the first electrodes and the second electrodes, a pixel being formed at each intersection of the first electrodes and the second electrodes so as to form a matrix of pixels as a whole. The optical modulation device is driven by applying an alternating address voltage signal comprising a fore pulse and a rear pulse to an addressed electrode among the first electrodes; and applying, to the second electrodes, a first voltage signal for orienting the pixels on the addressed electrode to the first orientation state in phase with the fore pulse, and a second voltage signal for providing a pixel among the pixels on the addressed electrode with a prescribed areal ratio between the first and second orientation states in the pixel depending on given gradation data; the first and second voltage signals being set to have substantially the same absolute value.

REFERENCES:
patent: 4508429 (1985-04-01), Nagae et al.
patent: 4548476 (1985-10-01), Kaneko
patent: 4563059 (1986-01-01), Clark et al.
patent: 4655561 (1987-04-01), Kanbe et al.
patent: 4709995 (1987-12-01), Kuribayashi et al.
patent: 4711531 (1987-12-01), Masubuchi

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