Apparatus and method for driving liquid crystal

Details Apparatus and method for driving liquid crystal Apparatus and method for driving liquid crystal

1996-11-25

1997-10-28

Wu, Xiao

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 99, G09G 336

Patent

active

056821760

ABSTRACT:
In order to drive a liquid crystal panel without causing flickering or noise on a screen, an analog signal (R) is input to sample and hold circuits SH through an amplifier 14. When the first half of the clock signals is input, the voltage values of the analog signal which are held in the corresponding circuits SH1 . . . SH(n/2) are added up in an adder 16, divided by n/2 in a divider 18, and output to a circuit SH(n/2+1). When the second half of the clock signals is input, the voltage values which are held in the corresponding circuits SH(n/2+2) . . . SH(n+1) are added up in an adder 16', divided (by n/2) in a divider 18', and output to a circuit SH(n+2). The outputs from the circuits SH(n/2+1) and SH(n+2) are summed in an adder 24 and divided by 2 in a divider 26. A driver circuit applies a voltage to the corresponding electrode of a liquid crystal panel according to the output from the divider 26.

REFERENCES:
patent: 4694349 (1987-09-01), Takeda et al.
patent: 5166670 (1992-11-01), Takeda et al.
patent: 5252957 (1993-10-01), Itakura

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