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METHOD FOR REDUCING HOT SPOTS IN LIGHT GUIDE PLATES

  • US 20130329452A1
  • Filed: 06/12/2012
  • Published: 12/12/2013
  • Est. Priority Date: 06/12/2012
  • Status: Abandoned Application
First Claim
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1. A method of reducing hot spots in a light guide plate, the light guide plate comprising:

  • an input surface for receiving light from a plurality of discrete light sources, an output surface for emitting light, a bottom surface opposing to the output surface, and an end surface opposing to the input surface,wherein the direction from the input surface to the end surface is defined as Y-axis, the direction that is perpendicular to the Y-axis and parallel to the discrete light sources is defined as X-axis, the output surface having a plurality of elongated grooves running parallel to the Y-axis and extending from the input surface corresponding to Y=0 to the end surface, the bottom surface having a core zone extending from a predetermined line corresponding to Y=Y1 to the end surface and a mixing zone extending from Y=0 to Y=Y1; and

    distributing a set of lenses in the core zone and a set of micro-lenses in the mixing zone, wherein the density of the set of micro-lenses stays constant in the X-axis, and a size and density of the micro-lenses is selected to redirect the light from the discrete light sources toward the Y-axis and provide a ratio L1/L0 that is between 0.9 and 1.1 for any Y≧

    Y1.

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