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Waveguides with improved intensity distributions

  • US 10,067,347 B2
  • Filed: 04/13/2016
  • Issued: 09/04/2018
  • Est. Priority Date: 04/13/2016
  • Status: Active Grant
First Claim
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1. An apparatus for use in replicating an image associated with an input-pupil to an output-pupil, the apparatus comprising:

  • an optical waveguide including input-coupler, one or more intermediate-components and an output-coupler;

    the input-coupler configured to couple light corresponding to the image associated with the input pupil into the optical waveguide and diffract the light corresponding to the image in at least two different directions so that light corresponding to the image is diffracted toward each of the one or more intermediate-components;

    the one or more intermediate-components configured to;

    perform odd-order pupil expansion on the light corresponding to the image that travels in the first direction from the input-coupler to the one intermediate-component by way of total internal reflection (TIR);

    perform even-order pupil expansion on the light corresponding to the image that travels in the second direction from the input-coupler to the one intermediate-component by way of TIR; and

    the output-coupler configured to couple the light corresponding to the image, that has travelled from the one or more intermediate-components to the output-coupler by way of TIR, out of the optical waveguide so that the light corresponding to the image is viewable from the output-pupil.

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