Data line drivers with column initialization transistor

Details Data line drivers with column initialization transistor Data line drivers with column initialization transistor

G - Physics

09

G

G09G 3/36 (2006.01)

Patent

CA 2169795

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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