Liquid crystal video display device having pulse-width modulated

Details Liquid crystal video display device having pulse-width modulated Liquid crystal video display device having pulse-width modulated

1987-01-30

1988-05-10

Miller, Stanley D.

G02F 113

Patent

active

047430966

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.

REFERENCES:
patent: 4508429 (1985-04-01), Nagae et al.
patent: 4523811 (1985-06-01), Ota
patent: 4548476 (1985-10-01), Kaneko
patent: 4701025 (1987-10-01), Endo et al.
patent: 4701026 (1987-10-01), Yazaki et al.
Donald E. Castleberry-Varistor-Controlled Liquid-Crystal Displays--Aug., 1979--6 pages--#1123.
Seigo Togashi et al.--A 210 X 228 Matrix LCD Controlled By Double Stage Diode Rings--4 pages--#141.
David R. Baraff et al.--The Optimization of Metal-Insulator-Metal Nonlinear Devices for Use in Multiplexed Liquid Crystal Displays--4 pages--#736.
Kenji Niwa et al.--LCTV Adressed by MIM Devices--4 pages--#304.

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