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Reflector and cover glass for substrate guided HUD

  • US 8,830,588 B1
  • Filed: 03/28/2012
  • Issued: 09/09/2014
  • Est. Priority Date: 03/28/2012
  • Status: Active Grant
First Claim
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1. A head up display comprising:

  • a substrate waveguide, configured for use as a combiner, the substrate waveguide receiving collimated light at an input and providing the collimated light to an output, the collimated light traveling from the input to the output within the substrate waveguide by total internal reflection, wherein an input diffraction grating is disposed in a first area at the input and an output diffraction grating is disposed in a second area at the output; and

    a plate covering at least a portion of the second area, wherein the output diffraction grating is disposed parallel to a face of the substrate waveguide at the second area, wherein the plate is disposed parallel to the output diffraction grating.

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