Driving circuit for a matrix type display device

Details Driving circuit for a matrix type display device Driving circuit for a matrix type display device

1990-01-26

1992-05-05

Oberley, Alvin E.

Communications: electrical

Visual indication

Movable

340784, 358236, G09G 300

Patent

active

051111950

ABSTRACT:
A driving circuit for a matrix type display device in which a plurality of picture elements are arranged in a matrix is disclosed. The driving circuit comprises a video signal output circuit for supplying video signals through output portions to the display device at each horizontal scan. The video signal output circuit comprises for each of the output portions: a comparison circuit for comparing the level of a video signal to be output, with the level of the output portion which is caused by the video signal output at the previous horizontal scan; and an output level control circuit for, when the level of said video signal to be output is higher than the level of the output portion, raising the level of said output portion to the level substantially identical with the level of the video signal to be output, and, when the level of said video signal to be otuput is lower than the level of the output portion, lowering the level of said output portion to the level substantially identical with the level of the video signal to be output.

REFERENCES:
patent: 4205311 (1980-05-01), Kutaragi
patent: 4523232 (1985-06-01), Kameda et al.
patent: 4525710 (1985-06-01), Hoshi et al.
patent: 4570115 (1986-02-01), Misawa et al.
patent: 4694349 (1987-09-01), Takeda et al.
patent: 4769639 (1988-09-01), Kawamura et al.
patent: 4781437 (1988-11-01), Shields et al.
European Search Report for EPC Application No. 90/300939.8, dated Apr. 30, 1990.

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