Display apparatus

Communications: electrical – Continuously variable indicating – With meter reading

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340784, G09G 102

Patent

active

051701588

ABSTRACT:
A display device has a driver circuit for driving data lines in a matrix display panel according to input digital signals. The driver circuit includes a number of digital-to-analog (D/A) converters, which number is less than the number of pixels contained in one horizontal scanning line. The D/A converters are repeatedly used to sequentially convert portions of the input digital image signal corresponding to one horizontal scanning line. The analog signals obtained by each D/A conversion are retained by a sample-and-hold circuit. When storage for one horizontal scanning line is completed, the signals are simultaneously delivered to the data lines. Therefore the display device can be reduced to a small circuit size. Also the offset voltage of the sample-and-hold circuitry can be reduced, since the outputs from the D/A converters can be sampled at an interval longer than the interval between pixels in the input digital signals.

REFERENCES:
patent: 4210934 (1980-07-01), Kutaragi
patent: 4257068 (1981-03-01), Johnston
patent: 4571584 (1986-02-01), Suzuki
patent: 4574282 (1986-03-01), Crossland et al.
patent: 4646074 (1987-02-01), Hashimoto
patent: 4742346 (1988-05-01), Gillette et al.
patent: 4748510 (1988-05-01), Umezawa
patent: 4870399 (1989-09-01), Carlson
OKI Semiconductor Handbook, "MSM 5280/5281GS--The Segment driver for TFT-LCD".
SID 88 Digest (pp. 232-234), "A1 Mega-Pixel Color a-Sift Liquid-Crystal Display" Castlebery et al, 1988.
Electronics Update, 1989, LSIH 5027A/5028, Japanese Translation.

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