Light emitting element driving device and portable apparatus...

Details Light emitting element driving device and portable apparatus... Light emitting element driving device and portable apparatus...

2007-01-02

2007-01-02

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Plural load device systems

C315S323000, C315S18500S, C362S800000, C362S802000, C362S806000

Reexamination Certificate

active

11078046

ABSTRACT:
A driving device for driving multiple (R-, G-, and B-) groups of LEDs operative at different voltages, utilizing a battery supplying a power supply voltage of a step-up voltage. Under normal operating conditions, R-LEDs are driven by the battery voltage, but G- and B-LEDs are driven by the step-up voltage. The battery voltage is monitored to ensure that all the LEDs are driven by the step-up voltage when the battery voltage has lowered below a predetermined level, thereby reducing the power loss by the LEDs while emitting light and extending the permissible range of the battery voltage.

REFERENCES:
patent: 2004/0036418 (2004-02-01), Rooke et al.
patent: 2005/0088207 (2005-04-01), Rader et al.
patent: 2002-214677 (2002-07-01), None

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