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Controlling method and system for LED-based backlighting source

  • US 7,317,288 B2
  • Filed: 09/02/2005
  • Issued: 01/08/2008
  • Est. Priority Date: 09/02/2005
  • Status: Active Grant
First Claim
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1. A method to improve the brightness uniformity in a light source having a plurality of light-emitters divided into a plurality of emitter groups, each group driven by an electrical current to produce light having a light intensity level, said method comprising the steps of:

  • embedding frequency information in the electrical currents driving the light-emitters in each emitter group;

    sensing the light produced by the emitter groups for providing a signal indicative of the sensed light, the sensed light having the embedded frequency information;

    determining from the signal the light intensity level of each emitter group based on the embedded frequency information; and

    adjusting the electrical currents driving the emitter groups based on the determined light intensity level.

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