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Optical displays

  • US 10,509,241 B1
  • Filed: 08/21/2014
  • Issued: 12/17/2019
  • Est. Priority Date: 09/30/2009
  • Status: Active Grant
First Claim
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1. An apparatus for providing light from a light source to an eye location, comprising:

  • a substrate having a first glass layer and a second glass layer;

    a first set of fold gratings disposed between the first glass layer and the second glass layer in the substrate arranged to receive light from the light source and to diffract the received light in a first direction as first diffracted light for propagation in the substrate; and

    a second set of output gratings disposed between the first glass layer and the second glass layer in the substrate arranged to receive the first diffracted light and to diffract the first diffracted light in a second direction as second diffracted light to the eye location, wherein the first direction is different from the second direction, wherein the first set of fold gratings, the second set of output gratings, the first glass layer and the second glass layer are part of a same waveguide structure.

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