Optical waveguide and head-mounted display device

Abstract

The application discloses an optical waveguide and a head-mounted display device, and relates to the technical field of optical waveguides.The optical waveguide comprises a waveguide substrate, an in-coupling grating and an out-coupling grating, and the in-coupling grating and the out-coupling grating are arranged in the waveguide substrate; wherein the curvature radius of a first grating boundary of the out-coupling grating is less than or equal to a preset curvature radius threshold, the preset curvature radius threshold is set according to the half-length size of the in-coupling grating, and the first grating boundary is a boundary of the out-coupling grating that is located on a first effective light path area between the in-coupling grating and the out-coupling grating, wherein the first effective light path area refers to a light path area formed by an incident light beam that is coupled into the waveguide substrate from the in-coupling grating and is coupled out of the waveguide substrate through the out-coupling grating.The application can effectively suppress the generation of dispersion phenomenon, so as to improve the imaging clarity and the visual experience of a user.

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