Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-06-14
1995-04-11
Brier, Jeffery A.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345196, G09G 336
Patent
active
054063043
ABSTRACT:
A full color liquid crystal driver which includes a line memory for dividing an input video signal for each horizontal scan period into n groups and expanding each divided signal to n folds, n amplifiers for amplifying the output signals of the line memory to be voltages necessary to drive a liquid crystal display element, and n signal output circuits. Given that the number of horizontal pixels of the liquid crystal display element is x and the horizontal scan period is t, the necessary operation frequency for the amplifiers and signal output circuits becomes 1/(n(t/x)), which is lower by 1
than the operation frequency necessary for the amplifiers and signal output circuits of prior art. In the case where the number of horizontal pixels is significantly increased in a conventional active matrix type liquid crystal display element, providing full color display requires very-fast amplifiers and very-fast signal output circuits for applying a voltage to the liquid crystal display element. The present invention can still use amplifiers and signal output circuits both functioning at the normal speed to easily drive a liquid crystal display element having a vast number of horizontal scan period.
REFERENCES:
patent: 4799057 (1989-01-01), Takeda et al.
patent: 4859998 (1989-08-01), Kawamura et al.
patent: 5157386 (1992-10-01), Uchida et al.
patent: 5170155 (1992-12-01), Plus et al.
patent: 5170158 (1992-12-01), Shinya
"4.3 inch Full Color LCD Module", Osamu Suegawa et al, Technical Report Vol. 41, No.5/1988.
Au A.
Brier Jeffery A.
NEC Corporation
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