Continuously variable color display device

Details Continuously variable color display device Continuously variable color display device

1986-10-24

1989-07-04

Brigance, Gerald L.

Communications: electrical

Land vehicle alarms or indicators

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

340701, 340767, 3408151, G09G 314

Patent

active

048454818

ABSTRACT:
A variable color display device comprises a plurality of display areas arranged in a 7-segment font. Each display area includes at least two light emitting diodes for emitting upon activation light signals of respectively different primary colors and means for blending the light signals within the display area to obtain a composite light signal of a composite color. The light emitting diodes are selectively activated by pulses of substantially constant amplitude to display desired characters. 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.

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.
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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