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Dual-color frontlit displays with near uniform color mixing

  • US 10,725,230 B1
  • Filed: 04/18/2017
  • Issued: 07/28/2020
  • Est. Priority Date: 04/18/2017
  • Status: Active Grant
First Claim
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1. A device comprising:

  • a light emitting diode (LED) array comprising a first LED that emits light having a first color and a second LED that emits light having a second color; and

    a light guide comprising a surface having a first portion adjacent to the first LED and a second portion adjacent to the second LED, wherein the first portion comprises a first plurality of binary element surface features formed on the surface, and the second portion comprises a second plurality of binary element surface features formed on the surface;

    wherein the first plurality of binary element surface features comprises a first binary element with a first central axis that is substantially parallel to a first direction of light emitted from the first LED, and a second binary element with a second central axis that is substantially perpendicular to a second direction of light emitted from the second LED, wherein the first central axis and the second central axis form an obtuse angle; and

    wherein the second plurality of binary element surface features comprises a third binary element, and a fourth binary element; and

    wherein the first plurality of binary element surface features and the second plurality of binary element surface features comprise raised linear protrusions.

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