Drive circuit for matrix display device

Details Drive circuit for matrix display device Drive circuit for matrix display device

1986-11-24

1988-05-24

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

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

340784, 340801, 340802, 377129, 377 76, 377115, G09G 336

Patent

active

047469153

ABSTRACT:
A drive circuit for sequentially driving electrodes of a matrix display device such as a liquid crystal display panel comprises a shift register divided into a plurality of groups of shift register stages and means for selectively applying a first clock signal and a second signal to the groups of stages, so that the groups become successively operative and so that power consumption of the currently inoperative groups is minimized. The second signal can comprise a low-frequency refresh clock signal, in the case of a dynamic type of shift register, or a DC potential in the case of static-type shift registers. During changeover between adjacent groups of shift register stages, the first clock signal is applied simultaneously to both groups, in order to ensure stable operation.

REFERENCES:
patent: 3577086 (1971-05-01), Kliman
patent: 3912950 (1975-10-01), Tada
patent: 4542301 (1985-09-01), Narabu
patent: 4612659 (1986-09-01), Starke
CMOS Cookbook, Lancaster; Howard W. Sams; 1977, pp. 266-269.

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