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Controlling light sources of a directional backlight

  • US 10,062,357 B2
  • Filed: 05/17/2013
  • Issued: 08/28/2018
  • Est. Priority Date: 05/18/2012
  • Status: Expired due to Fees
First Claim
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1. A method of controlling an array of light sources of a directional backlight that comprises a waveguide having an input end and the array of light sources disposed at different input positions in a lateral direction across the input end of the waveguide, the light sources associated with various widths in the lateral direction, the waveguide further comprising first and second, opposed guide surfaces for guiding light along the waveguide, the waveguide being arranged to direct input light from the light sources as output light through the first guide surface into optical windows in output directions distributed in a lateral direction to a normal to the first guide surface that are dependent on the input positions;

  • the method comprising selectively operating the light sources to direct light into varying optical windows, the light sources being controlled to output light with luminous fluxes, scaled inversely by the width associated with the respective light sources, that vary across the array of light sources, wherein a first light source in the array is controlled to output light with a first scaled luminous flux, the first light source being associated with a first width, and wherein a second light source in the array is controlled to output light with a second scaled luminous flux less than the first scaled luminous flux, the second light source being associated with a second width narrower than the first width.

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