Roger A Conley

US Patent:

20220197026, Jun 23, 2022

Filed:

Dec 20, 2021

Appl. No.:

17/645212

Inventors:

- Sunnyvale CA, US
Richard Bergstrom - Hayward CA, US
Roger Allen Conley Smith - Sunnyvale CA, US
Michiel Koen Callens - Sunnyvale CA, US
Nicholas Sherwood - Sunnyvale CA, US
Nima Shams - Sunnyvale CA, US
Milan Momcilo Popovich - Leicester, GB

Assignee:

DigiLens Inc. - Sunnyvale CA

International Classification:

G02B 27/01
F21V 8/00

Abstract:

Methods and apparatus for eye-glow suppression in waveguide systems is disclosed herein. Some embodiments of the methods and the apparatus include a source of image modulated light; a waveguide having an eye-facing surface and an external surface facing the outside world; an input coupler for coupling the light into a total reflection internal path in the waveguide; at least one grating for providing beam expansion and extracting light from the waveguide towards an eyebox; a polymer grating structure comprising a modulation depth and a grating pitch. The modulation depth is greater than the grating pitch across at least a portion of the polymer grating structure. Advantageously, the polymer grating structure is configured to diffract light entering the waveguide from the outside world or stray light generated within the waveguide away from optical paths that are refracted through the external surface into the outside world.