Data line drivers with column initialization transistor
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United States of America Patent
Stats
-
Nov 11, 1997
Grant Date -
N/A
app pub date -
Mar 6, 1995
filing date -
Mar 6, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A video display driver applies a video signal to column electrodes of a liquid crystal display. The display driver includes a reference ramp generator and column data line drivers. A reference ramp signal is combined with the video signal and applied to an input of a comparator. The comparator controls a first transistor that couples a data ramp signal to a given column of pixels. The first transistor at least partially initializes a voltage developed in the given column of pixels prior to an instant when the data ramp signal begins upramping. A second transistor that is coupled in parallel with the first transistor insures that the column voltage is fully initialized.
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