Seiko Epson Kabushiki Kaisha

Kabushiki Kaisha Seiko Epson

Yoshiro Uchikawa

Kikuo Oguchi

Satoru Yazawa

Yoichi Wakai

Hiroaki Ikejiri

Masahide Isuda

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.

Liquid crystal video display device having pulse-width modulated 'ON'

The invention relates to a system for driving a liquid crystal matrix display for use in a television wherein the signal applied to each pixel is inverted at a rate not greater than that necessary to scan a single pixel but greater than the rate necessary to cause crosstalk and in any event greater than the rate necessary to scan a line of pixels without inverting.

System for driving a liquid crystal matrix display so as to avoid

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Suwa, Japan

Yoshiro Uchikawa