Control circuit of area control driving circuit for LED light source and controlling method thereof
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United States of America Patent
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Jul 12, 2011
Grant Date -
Nov 20, 2008
app pub date -
Sep 6, 2007
filing date -
May 15, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A control circuit of a driving circuit for controlling a light emitting diode (LED) light source having a plurality of areas is provided. The control circuit includes the error amplifiers receiving a feed back current signal and a external reference voltage, and generating an error signal; a buffer register receiving a serial digital signal and generating the parallel digital signals; a work register receiving the parallel digital signals and a trigger signal, and outputting the parallel digital signals when the trigger signal is at a relatively high level; and a switch module having the power switches, each of which receives the error signal and the parallel digital signal for generating a driving signal to control a driving current of a specific area of the light source, in order to control the brightness in each area of the LED light source.
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