Driving circuit of a liquid crystal display

Details Driving circuit of a liquid crystal display Driving circuit of a liquid crystal display

1990-11-28

1992-11-10

Weldon, Ulysses

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340793, G09G 336

Patent

active

051627868

ABSTRACT:
A driving circuit of a liquid crystal display for driving source lines of an active-matrix type liquid crystal display having a thin film transistor matrix array comprising a shift register circuit for sequentially storing digital video signals for one line, each of the digital video signals being comprised of pixel data of a series of predetermined bits, a latch circuit for holding for one horizontal period the digital video signals for one line stored in the shift register circuit, a conversion circuit for classifying each pixel data constituting the digital video signals for one line outputted from the latch circuit into upper and lower bits, selecting adjacent two different DC voltages according to a value designated by the upper bits, performing pulse width modulation between the two different DC voltages according to a value designated by the lower bits and supplying analog video signals to the corresponding source lines of the matrix array, and a comparison data generating circuit for outputting comparison data which has bits by number equal to that of the lower bits and is compared with the lower bits to the conversion circuit.

REFERENCES:
patent: 4210934 (1980-07-01), Kutaragi
patent: 4590457 (1986-05-01), Amir
patent: 4743096 (1988-05-01), Wakai et al.
patent: 4859998 (1989-08-01), Kawamura et al.
"Electronic Circuits" Donald L. Shilling McGraw-Hill Book Company 1979 pp. 664-665.

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