Driver integrated circuits for active matrix type liquid crystal

Details Driver integrated circuits for active matrix type liquid crystal Driver integrated circuits for active matrix type liquid crystal

1992-10-06

1994-11-08

Weldon, Ulysses

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 89, 345211, G09G 336

Patent

active

053631188

ABSTRACT:
Provided is a novel multi-level driver system for driving active matrix circuits accommodated in liquid crystal display devices. The novel driver circuit structure permits a high gray level display without a substantial enlargement of the circuit scales and the number of external voltage supplies. The voltage levels supplied by the external voltage supplies are varied during writing performance of the voltage level. Logic circuits fetches digital data from a latch circuit and select any one of plural timing control signals. An analog switch is operated by output signals from the logic circuits. The variable voltage level is transmitted through the analog circuit to each pixel capacitor. The timing control of the switching performance determines resultant voltage level to be stored in the pixel capacitor. The gray levels are associated with the total number of voltage levels. The number of gray levels is equivalent to the number of the external voltage supplies multiplied by the number of variable voltage levels controlled by the switching performance of the analog switch.

REFERENCES:
patent: 4766430 (1988-08-01), Gillette et al.
patent: 5061920 (1991-10-01), Nelson
patent: 5122792 (1992-06-01), Stewart
patent: 5162786 (1992-11-01), Fukuda
patent: 5196738 (1993-03-01), Takahara et al.
"13.1: A 1 Mega-Pixel Color a-Si TFT Liquid-Crystal Display", SID 88 Digest, 1988, by D. Castleberry et al., pp. 232-235.
"27.4: CMOS Driver LSIs for Megapixel Multi-Color TFT-LCDs", SID 91 Digest, 1991, by K. Hyugaji et al., pp. 543-546.

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