Liquid crystal video display device having pulse-width modulated "ON" signal for gradation display
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United States of America Patent
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-
May 10, 1988
Grant Date -
N/A
app pub date -
Jan 30, 1987
filing date -
Feb 6, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides, in an active matrix liquid crystal display device of the type including non-linear elements, for the application of an ON pulse-width modulation signal by the data line driving circuit at the rearward end of each selected period, during which the voltage corresponding to the duty-cycle of the selected signal is applied to the liquid crystal layer. The result is accurate reproduction of gray-scale images in the display under conditions of high duty-cycle driving. Further, cross-talk between columns caused by the data signal is controlled by supplying a signal voltage which eliminates the residual charges in the liquid crystal layer at the end of each selected period.
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