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Optical displays

  • US 8,233,204 B1
  • Filed: 09/30/2009
  • Issued: 07/31/2012
  • Est. Priority Date: 09/30/2009
  • Status: Active Grant
First Claim
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1. An apparatus for providing an optical display, comprising:

  • an optical substrate for propagating light received from a light source;

    a first set of one or more switchable diffractive elements in the substrate; and

    a second set of one or more switchable diffractive elements in the substrate, each diffractive element in the second set corresponding to a diffractive element in the first set, each of the diffractive elements in the first and second sets configured to switch between on and off states, one of the states for diffracting light and the other state for allowing light to pass through, each of the first set of diffractive elements configured to diffract the light at an angle for propagation in the substrate, and each of the second set of diffractive elements configured to diffract the light for display.

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