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Variable brightness LCD backlight

  • US 10,043,457 B2
  • Filed: 02/18/2009
  • Issued: 08/07/2018
  • Est. Priority Date: 08/31/2004
  • Status: Active Grant
First Claim
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1. A method for displaying a display image on a backlit display device, the method comprising:

  • generating a source image comprised of a plurality of pixels, wherein each pixel in the source image has an associated initial brightness level;

    determining a first backlight input for a first backlight that illuminates pixels of the display device and a second backlight input for a second backlight that illuminates pixels of the display device based on a first brightness profile, a second brightness profile, and the source image, wherein the first brightness profile comprises a mapping of non-uniform brightness of the first backlight as a function of pixel position and wherein the second brightness profile comprises a mapping of non-uniform brightness of the second backlight as a function of pixel position;

    modifying a first intensity of the first backlight and a second intensity of the second backlight based on the first backlight input and the second backlight input; and

    computing an LCD input image that is based on the first backlight input, the second backlight input, the first brightness profile, the second brightness profile, and the source image.

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