Matrix display device

Details Matrix display device Matrix display device

1987-07-24

1988-04-05

Dixon, Harold

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

340781, 34082581, G09G 310

Patent

active

047361379

ABSTRACT:
In a matrix display device, a signal drive circuit comprises selection means for sequentially selecting at least one of display information signals corresponding to a plurality of signal electrodes when at least one of a plurality of scan electrodes is selected, hold means for holding the display information signal selected by the selection means until selection of at least corresponding scan electrode is completed, and voltage conversion means for selecting one of a plurality of voltage levels in accordance with the display information signal held by the hold means and supplying the selected voltage level to the signal electrodes. Since the display information signal is held by the hold means until the selection of at least corresponding scan electrode is completed, one of the plurality of voltage levels is always applied to the signal electrodes and the switching elements do not assume the high impedance state. Accordingly, ununiformity in display image is prevented and a large size matrix display device is provided.

REFERENCES:
patent: 3343128 (1967-09-01), Rogers
patent: 4042854 (1977-08-01), Luo et al.
patent: 4112333 (1978-09-01), Asars
patent: 4622590 (1986-11-01), Togashi
Liquid Crystal Matrix Display by Lechner et al, Proc. of IEEE Nov. 1971 vol. 59, No. 11 pp. 1566-1579.

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