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System and Method for Managing Backlight Luminance Variations

  • US 20110163691A1
  • Filed: 11/24/2010
  • Published: 07/07/2011
  • Est. Priority Date: 05/21/2008
  • Status: Active Grant
First Claim
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1. A method for controlling luminance variations in LED assemblies having a plurality of LEDs divided into two or more controllable regions, the method comprising:

  • driving a first and second LED region at preferred power levels;

    measuring the temperature at the first and second LED regions;

    calculating the temperature difference (Δ

    T1-2) between the first and second LED regions;

    comparing Δ

    T1-2 with a predetermined temperature difference Δ

    T; and

    increasing power to the LED region having the higher temperature measurement if Δ

    T1-2 is greater than Δ

    T orcontinuing with preferred power levels if Δ

    T1-2 is less than Δ

    T.

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