CPC G02B 27/0172 (2013.01) [G02B 27/283 (2013.01); G06T 19/006 (2013.01); G02B 2027/0118 (2013.01)] | 25 Claims |
1. An eyepiece waveguide for an augmented reality display system, the eyepiece waveguide comprising:
an optically transmissive substrate having a first surface and a second surface;
an input coupling grating (ICG) region formed on or in one of the surfaces of the substrate, the ICG region being configured to receive an input beam of light and to couple the input beam into the substrate as a guided beam;
a first combined pupil expander-extractor (CPE) grating region formed on or in the first surface of the substrate, the first CPE grating region being positioned to receive the guided beam from the ICG region and to create a first plurality of diffracted beams at a plurality of distributed locations, and to out-couple a first plurality of output beams,
wherein the first CPE grating region is a first two-dimensional (2D) CPE grating region; and
a second CPE grating region formed on or in the second surface of the substrate, the second CPE grating region being positioned to receive the guided beam from the ICG region and to create a second plurality of diffracted beams at a plurality of distributed locations, and to out-couple a second plurality of output beams,
wherein the second CPE grating is a second 2D CPE grating region.
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