Near to eye projection systems

Abstract

AR displays experience limited FOV, low efficiency and high weight partly due to the use of SRGs. Investigated here are improvements to HUDs, replacing gratings with novel structures and high throughput fabrication. Design and fabrication improved upon current systems for diffractive elements and materials. Fabrication produced these in a high transparency, high refractive index glass. Structures were evaluated and improvements over conventional gratings found, enabling improved optics for novel augmented reality devices.A new type of diffractive structure was produced, demonstrating to our knowledge the structure of this kind in transparent materials. Silicon oxynitride deposition for low-absorption hydrogen-free layers with a tuneable refractive index range greater than other methods, was demonstrated at ambient temperatures.<br/