Data line drivers with common reference ramp display
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United States of America Patent
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-
Sep 23, 1997
Grant Date -
N/A
app pub date -
Dec 4, 1996
filing date -
Mar 6, 1995
priority date (Note) -
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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. Each data line driver includes a switching arrangement coupled to a first capacitance for storing a portion of the video signal in the first capacitance. A first terminal of the first capacitance is coupled to the reference ramp generator for combining a reference ramp signal with the stored video signal and for applying the combined signal to an input of a comparator. The comparator controls a transistor that couples a data ramp signal to a given column of the pixels. The reference ramp generator is coupled to the input of the comparator in a non-switched manner such that no switching transistor is interposed in a signal path between the reference ramp generator and the input of the comparator.
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