Grating waveguide for augmented reality

Abstract

The invention discloses a grating waveguide for augmented reality, and the grating waveguide comprises a display light source, a waveguide element disposed opposite to the display light source, and acoupling element provided on the waveguide element, wherein the coupling element includes a first coupling-in grating and a first coupling-out grating, the waveguide element, the first coupling-in grating and the first coupling-out grating are all in curved structures and have the same curvature, and the light emitted by the display light source realizes total reflection in the waveguide element after passing through the waveguide element and the first coupling-in grating, and is incident into the field of vision of the observe after passing through the first coupling-out grating and the waveguide element. The invention adopts a curved grating waveguide and uses a curved waveguide structure to achieve the purpose of expanding the visible area of the optical waveguide, thereby effectively improving the sharpness of the edge of the screen, enhancing the sense of presence, and adapting the effect of the diopter adjustment lens.

Description

technical field [0001] The invention relates to the technical field of augmented reality, in particular to a grating waveguide for augmented reality. Background technique [0002] As a wearable smart device, smart glasses based on augmented reality (Augmented Reality) have attracted much attention in recent years. AR glasses enhance the user's perception of the world by displaying virtual information that matches the real world. Among them, the AR lens as an optical display element is a key technical point. The combined structure of gratings and optical waveguides is a highly respected optical display solution for AR lenses. [0003] At present, the grating waveguide structure suitable for mass replication production is the combined structure of surface relief grating and glass optical waveguide. Akonia, Dispelix, waveoptics, Microsoft and other companies and research institutions are developing this solution. The structure of the traditional scheme is as follows figure ...

AI Technical Summary

Problems solved by technology

The common grating waveguide plate structure is limited by the refractive index of the waveguide material, and the viewing angle of the AR lens with this structure needs to be improved

In addition, due to the flat panel structure, the distance between each pixel on the image plane and the human eye is not equal, and the fidelity and immersion of the display effect are poor.

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