Light emitting diode control device

Details Light emitting diode control device Light emitting diode control device

2006-05-23

2006-05-23

Philogene, Haissa (Department: 2828)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C315S291000, C315S169300, C315S312000, C340S475000, C340S870030, C340S870030

Reexamination Certificate

active

07049752

ABSTRACT:
A control device of LEDs includes a lighting-up circuit and a lighting-out circuit, both of which generate pulse signals being pulse-width modulated by varying cycles and corresponding duty ratios based on an input signal during a start-up period and a falling period, respectively. The control device then provides LEDs with the electric current relative to the pulse signals. Both of the lighting-up circuit and lighting-out circuit vary the cycles and corresponding duty ratios of the pulse signals, so that a luminance variation characteristic of the LEDs becomes nonlinear, leading to being approximated to a luminance variation characteristic of an electric bulb.

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patent: 6628252 (2003-09-01), Hoshino et al.
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patent: 6844760 (2005-01-01), Koharagi et al.
patent: A-2001-244087 (2001-09-01), None

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