Method and apparatus for driving optical modulation device

Details Method and apparatus for driving optical modulation device Method and apparatus for driving optical modulation device

1987-11-03

1990-05-22

Miller, Stanley D.

Communications: electrical

Land vehicle alarms or indicators

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

350333, 340784, G02F 113

Patent

active

049272438

ABSTRACT:
In an optical modulation device, a matrix of pixels are formed at intersections of scanning lines and data lines so as to assume either a first optical state or a second optical state. In a first phase, a voltage V.sub.R of one polarity is applied to the pixels on a selected scanning line to provide the first optical state. In a second phase, the pixels on the selected scanning line are selectively supplied with a voltage V.sub.B.sup.2 of the other polarity inverting the first optical state to the second optical state or a voltage V.sub.B.sup.1 of the other polarity not changing the first optical state. Herein, the minimum of the durations of single-polarity voltages is defined as .DELTA.t, and a voltage at which the optical conversion from the first to the second optical state or vice versa is saturated based on the minimum application time .DELTA.t is defined as a saturation threshold voltage Vsat. Then, the application time of the voltage V.sub.R exceeds the minimum application time .DELTA.t, and a pixel supplied with the voltage V.sub.B.sup.1 in the second phase is supplied with a voltage V.sub.R, the maximum amplitude of which does not exceed the saturation threshold voltage Vsat in terms of absolute values, in the first phase.

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