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Diffractive waveguide providing structured illumination for object detection

  • US 10,409,144 B2
  • Filed: 08/07/2017
  • Issued: 09/10/2019
  • Est. Priority Date: 10/09/2009
  • Status: Active Grant
First Claim
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1. Apparatus for projecting an image onto a surface comprising:

  • a first light source emitting light of a first wavelength;

    first and second multiplicities of separately switchable grating elements;

    transparent substrates sandwiching said grating elements providing a first light guide; and

    a means for coupling said first wavelength light into a total internal reflection path in said first light guide,each said grating element having a diffracting state and a non-diffracting state, wherein each element of said first multiplicity of grating elements when in its diffracting state diffracts said first wavelength light to form a focused first image region of predefined geometry and luminance distribution on said image surface,wherein each element of said first multiplicity of grating elements encodes wave-front amplitude and phase information corresponding to said geometry and luminance distribution,wherein each said element of said second multiplicity of grating elements provides a first unique speckle state under a first applied voltage and a second unique speckle state under a second applied voltage.

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