Continuously variable color optical device

Details Continuously variable color optical device Continuously variable color optical device

1989-03-13

1990-10-23

Oberley, Alvin E.

Communications: electrical

Land vehicle alarms or indicators

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

340701, 340767, 3408151, G09G 314

Patent

active

049655612

ABSTRACT:
A variable color optical device comprises three light emitting diodes for emitting upon activation light signals of respectively different primary colors and means for blending the light signals to obtain a composite light signal of a composite color. The light emitting diodes are substantially simulteneously activated by pulses of a substantially constant amplitude. Color control selectively controls the durations of the pulses to control the portions of the primary colors, to thereby control the color of the composite light signal emitted from the optical device.

REFERENCES:
patent: 3740570 (1973-06-01), Kaelin et al.
patent: 3840873 (1974-10-01), Usui
patent: 3924227 (1975-12-01), Stolov
patent: 4488149 (1984-12-01), Givens, Jr.
patent: 4845481 (1989-07-01), Havel
IBM Technical Disclosure Bulletin, "Electroluminescent Display", R. W. Landauer, vol. 8, No. 11, Apr. 1966.
Bill Wagner, "2-Color LED+Driver=Versatile Visual Effects", Oct. 20, 1980, EDN, vol. 25, No. 19.

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