LED driver circuit

Details LED driver circuit LED driver circuit

1985-10-09

1988-05-10

Curtis, Marshall M.

Communications: electrical

Visual indication

Movable

340761, 340762, G09G 332

Patent

active

047438975

ABSTRACT:
An LED driver circuit including a current source for generating constant drive current to a plurality of series connected LEDs, circuitry for selectively enabling and disabling predetermined ones of the LEDs and further circuitry for disabling the current source in the event none of the LEDs are enabled. The LED driver circuit is of simple design and low cost, and is characterized by low power consumption due to the current source being disabled in the event none of the LEDs are enabled.

REFERENCES:
patent: 3548403 (1970-12-01), Johnson
patent: 4017847 (1977-04-01), Burford et al.
patent: 4112424 (1978-09-01), Lapeyre
patent: 4198629 (1980-04-01), Marion

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