Display device drive circuit

Details Display device drive circuit Display device drive circuit

1986-12-19

1988-08-23

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

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

340767, 340784, 340805, 340800, 358241, 358236, G09G 336

Patent

active

047664304

ABSTRACT:
A drive circuit for a liquid crystal display includes a counter for each column of the display. The counters are set with brightness counts to establish the grey scales for the pixels. The counters turn transfer gates on when a count is present and off when the count is zero. An analog generator biases the columns through the transfer gates so that each column is biased to a level determined by the brightness count of the respective counter.

REFERENCES:
patent: 4180813 (1979-12-01), Yoneda
patent: 4210934 (1980-07-01), Kutaragi
patent: 4353062 (1982-10-01), Lorteije et al.
patent: 4427978 (1984-01-01), Williams
patent: 4429305 (1984-01-01), Hosokawa et al.
patent: 4554539 (1985-11-01), Graves
patent: 4571584 (1986-12-01), Suzuki

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