Drive circuit for ferroelectric liquid crystal shutter
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United States of America Patent
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Jan 16, 2001
Grant Date -
N/A
app pub date -
Aug 25, 1997
filing date -
Feb 25, 1995
priority date (Note) -
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Abstract
In order to overcome problems with residual d.c. offset, and input signals with arbitrary timing, a drive circuit for a ferroelectric liquid crystal device includes a counter arranged for counting between first and second predetermined values in response to an input signal. The counter is designed so as to count in a first direction in response to a positive edge of the input signal and in a second direction in response to a negative edge of the input signal. Gating and latching circuits are responsive to the counting of the counter and the direction of count so as to provide appropriate positive or negative output voltage pulses for driving a ferroelectric liquid crystal device. An output stage comprising a bridge circuit is coupled via a step up transformer to the display device.
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