Light emitting alarm board

Details Light emitting alarm board Light emitting alarm board

1989-04-11

1990-03-13

Crosland, Donnie L.

Communications: electrical

Condition responsive indicating system

With particular system function

340461, 340781, 313503, 313506, 428690, 428917, G08B 2500, B60Q 100

Patent

active

049086030

ABSTRACT:
A light-emitting alarm board uses thin-film EL elements which emit light of different colors individually or simultaneously, depending on the voltages applied thereon, thereby serving as display lamps for indicating the conditions of operation of a system being monitored.

REFERENCES:
patent: 4666793 (1987-05-01), Hirate
patent: 4717606 (1988-01-01), Hale
patent: 4717858 (1988-01-01), Tanaka et al.
patent: 4727004 (1988-02-01), Tanaka et al.
patent: 4730146 (1988-03-01), Maser et al.
patent: 4741976 (1988-05-01), Eguchi et al.

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