公开(公告)号：US20220197026A1

公开(公告)日：2022-06-23

申请号：US17645212

申请日：2021-12-20

Applicant: DigiLens Inc.

Inventor： Alastair John Grant ,  Richard Bergstrom ,  Roger Allen Conley Smith ,  Michiel Koen Callens ,  Nicholas Sherwood ,  Nima Shams ,  Milan Momcilo Popovich

IPC: G02B27/01 ,  F21V8/00

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.