LED lighting device and LCD device using the same
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United States of America Patent
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Apr 14, 2009
Grant Date -
Sep 13, 2007
app pub date -
Jan 18, 2007
filing date -
Mar 9, 2006
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An LED lighting device can compensate a brightness change and a color change caused by a temperature change and exhibit an in-plane uniform luminance and color. A lighting device includes: at least one line connected in parallel, a constant voltage source for applying a constant voltage to the line, an ON/OFF controller, and a current detector for measuring a value of current flowing in the line. The line 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. According to the current value of each of the lines measured by the current detector, the ON/OFF controller controls the ON/OFF period of the switch of each of the lines.
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Cited Art Landscape
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