Waveguide-Based Displays Incorporating Evacuated Periodic Structures

Abstract

Disclosed herein is a waveguide based display including: an optically transparent substrate; an input grating including an evacuated periodic structure (EPS) supported by the substrate, wherein the input grating diffracts light into total internal reflection (TIR) within the substrate; a fold grating comprising an EPS or a volume Bragg grating (VBG), wherein the fold grating receives the TIR light and expands the TIR light in a first direction; and an output grating including an EPS or a VBG. The output grating receives the expanded light and outputs the light and the input grating is spatially separated from the fold grating and the output grating.

Dependencies are inferred from the claim text.