×

Diffractive optical elements with varying direction for depth modulation

  • US 9,864,208 B2
  • Filed: 07/30/2015
  • Issued: 01/09/2018
  • Est. Priority Date: 07/30/2015
  • Status: Active Grant
First Claim
Patent Images

1. An optical system, comprising:

  • a substrate of optical material;

    a first diffractive optical element (DOE) disposed on the substrate, the first DOE having an input surface and configured as an in-coupling grating to receive one or more optical beams as an input; and

    a second DOE disposed on the substrate and configured for pupil expansion of the one or more optical beams along a first direction,wherein at least a portion of the second DOE includes two or more regions in which a depth modulation direction is constant within a region and changes at each transition between regions, the depth modulation direction described by a steepest change of grating depth in the second DOE, andwherein the two or more regions in the second DOE do not include multi-level grating features.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×