Display driver with duty cycle control

Details Display driver with duty cycle control Display driver with duty cycle control

1993-11-04

1995-09-19

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345212, G09G 300

Patent

active

054519799

ABSTRACT:
A display sign includes a matrix of LED lights which are energized from an unregulated power supply during periodic duty cycles. The duty cycles are adjusted by a programmed microprocessor such that the power supply is not overloaded when a large number of LEDs are energized, and such that excessive power is not applied to the LEDs when a small number of LEDs are energized and the power supply voltage increases.

REFERENCES:
patent: 4441106 (1984-04-01), Jackson
patent: 4514727 (1985-04-01), Van Antwerp
patent: 4642524 (1987-02-01), Eaton et al.
patent: 4887074 (1989-12-01), Simon et al.
patent: 4897639 (1990-01-01), Kanayama
patent: 5184114 (1993-02-01), Brown
patent: 5218352 (1993-06-01), Endoh et al.
patent: 5247286 (1993-09-01), Ishikawa
patent: 5278542 (1994-01-01), Smith et al.

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