Tri-state function indicator

Details Tri-state function indicator Tri-state function indicator

1987-08-13

1989-06-06

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

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

340782, 34081503, 362800, G05G 314

Patent

active

048375659

ABSTRACT:
In order to indicate a function status which can be one of three states, upon detecting a first state, a bicolor LED is lighted with a first color; upon detecting a second state, the LED is lighted with a second color; and upon detecting a third state, the LED is alternately lighted with said first and said second colors at a sufficiently high rate to cause the color of the LED to appear as a third color.

REFERENCES:
patent: 3840858 (1974-10-01), Usui
patent: 3840873 (1974-10-01), Usui
patent: 4420711 (1983-12-01), Takahashi et al.
patent: 4488149 (1984-12-01), Givens, Jr.
patent: 4491974 (1985-01-01), Bouchant
patent: 4734619 (1988-03-01), Haval
Kraus; "Two LEDs blend and blink to indicate six states"; Ideas for Design; Electronic Design; Aug./5/82; p. 72; vol. 30, No. 16.
Ralphsnyder; "2-color LED X 3 bits=8 visual effects"; Design Ideas; vol. 26, No. 14; Jul./22/81; pp. 382-383.

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