LED emitting device and driving method thereof
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United States of America Patent
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Aug 26, 2014
Grant Date -
Aug 9, 2012
app pub date -
Jan 19, 2012
filing date -
Feb 7, 2011
priority date (Note) -
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Abstract
The present invention relates to an LED light emitting device and a driving method thereof. The LED light emitting device supplies a power supply voltage to at least two LED channels. The LED light emitting device samples channel voltages of the at least two LED channels to detect a minimum voltage from among the sampled voltages, and amplifies a difference between the detected minimum voltage and a predetermined reference voltage to generate an error amplifying signal. The LED light emitting device generates an enable signal having a duty extended by a predetermined delay period from a duty of a dimming signal for controlling light emission periods of the at least two LED channels. In this instance, the error generator is operable by the enable signal.
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