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Method and apparatus for generating input images for holographic waveguide displays

  • US 10,241,330 B2
  • Filed: 06/29/2015
  • Issued: 03/26/2019
  • Est. Priority Date: 09/19/2014
  • Status: Active Grant
First Claim
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1. An image generation device comprising:

  • a spatial light modulator (SLM) having a light modulating surface;

    a source emitting a first wavelength light;

    a beam deflector for forming said first wavelength light into a scanned beam having a scanned beam angle;

    an illumination waveguide containing at least one switchable grating disposed in at least one layer;

    an image transport waveguide overlaying the light modulating surface of said SLM and containing at least one switchable grating disposed in at least one layer; and

    a coupler for directing said scanned beam into a first set of total internal reflection (TIR) paths in said illumination waveguide,said at least one switchable grating in said illumination waveguide diffracting light out of said first set of TIR paths onto said SLM,said SLM modulating light diffracted from said illumination waveguide with image information that varies with the scanned beam angle to form image-modulated light and reflecting the image-modulated light through said illumination waveguide onto said image transport waveguide, andsaid at least one switchable grating in said image transport waveguide diffracting said image-modulated light into a second set of TIR paths in said image transport waveguide.

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