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LED BACKLIGHT DRIVER SYNCHRONIZATION AND POWER REDUCTION

  • US 20100020004A1
  • Filed: 07/23/2008
  • Published: 01/28/2010
  • Est. Priority Date: 07/23/2008
  • Status: Active Grant
First Claim
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1. An apparatus for providing a LED backlight to a LCD display screen, comprising:

  • N LED strings, wherein N is an integer greater than or equal to two;

    a first circuit operable to synchronize a LED clock signal to a LCD timing signal; and

    a second circuit operable to generate N PWM drive signals synchronized with the LED clock signal, wherein the N PWM drive signals are phase offset from each other by a multiple of 360/N degrees and used to drive respective ones of the N LED strings.

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