Matrix display devices with interconnected diode ring circuit pr

Details Matrix display devices with interconnected diode ring circuit pr Matrix display devices with interconnected diode ring circuit pr

1989-01-13

1990-12-18

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

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

340765, 340719, 350333, G09G 336

Patent

active

049789511

ABSTRACT:
An active, matrix addressed display device comprising an array of display elements (37), e.g. liquid crystal display elements, each connected in series with a diode ring type non-linear device (31) between associated row and column address conductors (34, 35). The non-linear device comprises two parallel conduction paths each containing at least three series-connected diode elements (e.g. A1-E1, A2-E2) which permit current flow in a respective direction. The conduction paths share one or more intermediate diode elements (e.g. B1 or B1-D1). The one or more intermediate diode elements may be interconnected, either individually or as a group, in parallel with diode element(s) (e.g. B2 or B2-D2 respectively) of the other conduction path thereby providing alternative branches for fault tolerance but using fewer diode elements than usual for such purposes. Alternatively, the one or more intermediate diode elements (e.g. B1-D2) of one conduction path may be interconnected in series between two diode elements (A2, B2) of the second conduction path so as to form the sole path between those two elements, thereby reducing the number of diode elements required for each non-linear element.

REFERENCES:
patent: 4223308 (1980-09-01), Baraff et al.
patent: 4251136 (1981-02-01), Miner et al.
patent: 4642620 (1987-02-01), Togashi et al.
patent: 4666252 (1987-05-01), Yaniv et al.
patent: 4748445 (1988-05-01), Togashi et al.
patent: 4794385 (1988-12-01), Kuijk

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