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Degrees of freedom for diffraction elements in wave expander

  • US 10,241,346 B2
  • Filed: 05/07/2016
  • Issued: 03/26/2019
  • Est. Priority Date: 05/07/2016
  • Status: Active Grant
First Claim
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1. A near-eye display device comprising:

  • an imager to generate an image based on light from a light source; and

    a waveguide to input a light wave representing the image received from the imager and to output the light wave representing the image toward an optical receptor of a user of the near-eye display device, the waveguide including a plurality of diffractive optical elements (DOEs) in a common light path from an input of the waveguide to an output of the waveguide, the DOEs including a plurality of periodic diffraction patterns, each of the periodic diffraction patterns being represented by a corresponding diffraction pattern vector, the periodic diffraction patterns being such that a vector summation of the diffraction pattern vectors of the plurality of DOEs equals zero,wherein the plurality of DOEs include;

    a first DOE to receive the light wave incident upon the first DOE in a first direction and redirect the light wave;

    a second DOE to receive the light wave from the first DOE and expand the light wave in a second direction, the light wave being reflected by a periodic diffraction pattern of the second DOE for an even integer number of times; and

    a third DOE to further expand the light wave in a third direction and redirect the expanded light wave toward the optical receptor of the user in the first direction.

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