LED driving device

Details LED driving device LED driving device

2006-01-24

2006-01-24

Chang, Kent (Department: 2675)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C315S291000, C315S307000, C323S364000, C340S815400, C340S815450, C340S815520, C345S083000, C345S084000, C345S098000, C372S038030

Reexamination Certificate

active

06989807

ABSTRACT:
A LED driving device includes a plurality of LEDs, a voltage detecting circuit, and a current switching circuit. When the voltage detecting circuit detects the different voltage level of power source without coupling to a filtering capacitor, it sends a signal to the current switching circuit and then the current switching circuit is automatically activated to electrically rearrange the configuration of LEDs with a predetermined current value by lighting the greatest number of LEDs that improving the power factor and efficiency.

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patent: 2002/0140379 (2002-10-01), Chevalier et al.
patent: 2004/0046673 (2004-03-01), Kovarik et al.

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