Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-03-06
1997-09-30
Peng, John K.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345104, 345204, G02F 1133
Patent
active
056730632
ABSTRACT:
A video display driver applies a video signal to pixels arranged in columns and rows of a liquid crystal display. A given column or data line driver includes a field effect transistor that operates as a comparator. The comparator is responsive to the video signal and to a reference ramp signal. A triggering voltage of the comparator is automatically and periodically adjusted. A drain voltage of the transistor that is equal to a threshold voltage of the transistor is developed in a stray capacitance, during the automatic adjustment period. A pulse signal, is coupled via the capacitance to increase the drain voltage. The drain voltage is applied to a gate electrode of a second field effect transistor that applies a data ramp voltage to the pixels. The pulse signal provides a small amount of drive in the second transistor.
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(RCA 87891) U.S. Ser. No. 08/399,012, filed Mar.-6-95 by S. Weisbrod, entitled Data Line Drivers with Column Initilization Transistor.
(RCA 87577) U.S. Ser. No. 08/399,009, filed Mar.-6-95 by R.I.A. Huq, et al., entitled Data Line Drivers with Common Reference Ramp Display.
(RCA 87876) U.S. Ser. No. 08/398,822, filed Mar.-6-95 by A.G.F. Dingwall, et al., entitled An Amplifier with Pixel Voltage Compensation For A Display.
Henig Sammy S.
Kovacs Peter
Laks Joseph J.
Peng John K.
Thomson Consumer Electronics S.A.
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