LED lighting device and LCD device using the same

Details LED lighting device and LCD device using the same LED lighting device and LCD device using the same

2011-04-26

2011-04-26

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Current and/or voltage regulation

C315S247000, C315S224000, C315S274000, C315S312000

Reexamination Certificate

active

07932681

ABSTRACT:
A lighting device includes at least two lines connected in parallel, a constant current source for applying a constant current to at least one of the at least two lines, an ON/OFF controller, and a voltage detector for measuring a value of voltage flowing in each line of the at least two lines. Each line of the at least two lines is formed by one or more light-emitting diodes and a switch for turning ON/OFF the current flowing in the light-emitting diodes connected in series, and according to the voltage value of each line of the at least two lines measured by the voltage detector, the ON/OFF controller controls the duty ratio of the one or more light-emitting diodes of each line in accordance with the voltage measured.

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patent: 2007-165832 (2007-06-01), None

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