Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-12-14
1997-06-17
Bayerl, Raymond J.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 96, 345209, G09G 336
Patent
active
056401744
ABSTRACT:
A method for driving a liquid crystal display device including a TFT liquid crystal display panel. The TFT liquid crystal display panel includes a plurality of pixel electrodes, a common electrode opposing the pixel electrodes, and a liquid crystal layer disposed between the pixel electrodes and the common electrode. The method includes the steps of generating a plurality of positive gradation voltages with a first voltage dividing resistor circuit, the first voltage dividing resistor circuit being a single series circuit formed by a plurality of resistors connected in series, each of the positive gradation voltages being higher than a midpoint voltage Vasc, generating a plurality of negative gradation voltages with a second voltage dividing resistor circuit, the second voltage dividing resistor circuit being a single series circuit formed by a plurality of resistors connected in series, each of the negative gradation voltages being lower than the midpoint voltage Vasc and being paired with a respective one of the positive gradation voltages, thereby providing a plurality of paired positive and negative gradation voltages, and applying the positive gradation voltages and the negative gradation voltages to the pixel electrodes in accordance with a display signal representing information to be displayed on the TFT liquid crystal display panel. Respective averages of the paired positive and negative gradation voltages are positive, and increase with respect to a reference voltage VC as respective differences between the paired positive and negative gradation voltages decrease, the reference voltage VC being lower than the midpoint voltage Vasc.
REFERENCES:
patent: 4789223 (1988-12-01), Kashara et al.
patent: 5250937 (1993-10-01), Kikuo et al.
Hitachi LED Driver Data Book, Hitachi, Ltd., Mar. 1990, pp. 650-665 (Japanese edition) and pp. 910-929 (English edition).
Nikkei Electronics, Nikkei McGraw-Hill, Sep. 10, 1994, pp. 211-240 (in Japanese).
Iwamoto Ken-ichi
Kamei Tatsuo
Ohwada Jun-ichi
Owaki Yoshio
Bayerl Raymond J.
Hitachi , Ltd.
Hitachi Device Engineering & Co., Ltd.
Luu Matthew
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