O2Micro(R) International Limited was issued 20 claims under United States patent number 8,120,280 for its Circuits and Methods for LED control.
This invention controls the power delivered to the LED string to achieve the predetermined brightness, including proper dimming control."O2Micro's invention provides a user-friendly dimming control frequency to LED lighting applications," remarked Dr. Yung Lin, executive vice president, O2Micro.
Source:
http://en.cnledw.com/nd8833.htm
