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Redundant operation of a backlight unit of a display device under a shorted LED condition

  • US 9,076,357 B2
  • Filed: 11/16/2012
  • Issued: 07/07/2015
  • Est. Priority Date: 11/16/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • controlling at least one light-emitting diode (LED) string of a backlight unit in a first mode, wherein the LED string comprises a plurality of LEDs electrically connected in series, such that all of the LEDs of the LED string are controlled to each provide a first light output, wherein the combined first light output from all of the LEDs provides a target luminance output for the LED string;

    determining whether a shorted LED failure condition occurs in any of the LEDs in the LED string; and

    in response to detecting a shorted LED failure condition across at least one of the LEDs in the LED string, controlling at least one other LED string in a second mode to compensate for the shorted LED failure condition such that the remaining operational LEDs of the LED string are controlled to each provide the first light output, and LEDs of the at least one other LED string are each controlled to provide a second light output greater than the first light output, wherein the second light output of the LEDs of the at least one other LED string compensates for a difference between the target luminance output for the LED string and the combined first light output from the remaining operational LEDs of the LED string.

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