Luminescent solid state status indicators

Details Luminescent solid state status indicators Luminescent solid state status indicators

1974-12-24

1976-06-15

Curtis, Marshall M.

Communications: electrical

Systems

Call station

340248C, 340253A, 324133, G08B 2100

Patent

active

039640396

ABSTRACT:
A luminescent solid state status indicator including at least first and second light emitting diodes of different colors which may be mounted on a single header. One side of each of the diodes is connected in common to one side of a source of energizing voltage subject to variation in magnitude. The other sides of the diodes are interconnected with the electrodes of a transistor which has one electrode connected to the other side of the DC energizing voltage. The transistor is adapted selectively to energize the first and second light emitting diodes to display colors corresponding respectively to discrete magnitudes of said energizing voltage.

REFERENCES:
patent: 3300659 (1967-01-01), Watters
patent: 3813664 (1974-05-01), Geyer
patent: 3863150 (1975-01-01), Cebuliak

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