Apparatus for driving multi-color LED strings
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United States of America Patent
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Feb 9, 2016
Grant Date -
Aug 7, 2014
app pub date -
Feb 2, 2013
filing date -
Feb 2, 2013
priority date (Note) -
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Abstract
An apparatus comprises red, green and blue LED strings each having a corresponding switching circuit. Each LED string is divided into a plurality of LED segments. The three LED strings are connected in parallel or in series. Each LED string may be connected in series with a respective current source or share a common current source. A controller controls each switching circuit so that the number of LED segments connected in series in the red, green or blue LED string can be respectively controlled according to a color setting signal and the voltage level of an input voltage. A first control method is provided for controlling the apparatus having a constant input voltage and a second control method is provided for controlling the apparatus having a periodically time-varying input voltage.
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