Two-dimensional grating, optical waveguide and AR glasses

Abstract

The embodiment of the invention relates to the technical field of optics, in particular to a two-dimensional grating, an optical waveguide and AR glasses. The embodiment of the invention provides a two-dimensional grating, an optical waveguide and AR glasses. The two-dimensional grating comprises at least one period, on one hand, the proportion of the long side size to the short side size of the two-dimensional grating in each period increases the diversity of the light beam expansion propagation direction, and on the other hand, the grating structure and the size can be freely designed in each period, so that the design diversity is increased, the designed grating structure is applied to the optical waveguide and the AR glasses, and the problems of exit pupil uniformity and view field uniformity in the optical waveguide and the AR glasses are solved.

Description

technical field [0001] Embodiments of the present invention relate to the field of optical technology, and in particular to a two-dimensional grating, an optical waveguide, and AR glasses. Background technique [0002] AR glasses based on optical waveguides are currently one of the most promising AR glasses for large-scale applications. Due to its small structure, light weight and powerful optical functions, the optical waveguide is the core device for realizing portable AR glasses. At present, the optical waveguide based on relief grating is the mainstream choice for the optical waveguide of AR glasses. The current solution paths for embossed grating waveguides mainly include waveguide solutions based on one-dimensional gratings and waveguide solutions based on two-dimensional gratings. Based on the one-dimensional grating waveguide solution, there will be an expansion area, which will occupy a large part of the area, and when the field of view increases, the expansion ar...

AI Technical Summary

Problems solved by technology

[0003] In the current two-dimensional grating-based optical waveguide scheme, the diffraction order of the grating is fixed, resulting in fixed expansion and outcoupling forms of the grating waveguide in the outcoupling region, and the design form is relatively simple

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