Diffractive optical waveguide

CN224328257UActive Publication Date: 2026-06-05SHANGHAI NORTH OCEAN TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHANGHAI NORTH OCEAN TECH CO LTD
Filing Date
2025-05-23
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

The height difference of existing surface relief diffraction waveguides causes light scattering, affecting the imaging effect.

Method used

An auxiliary structure is added to the edge of the grating structure, designed to gradually decrease in height away from the grating edge, to create a height-gradient transition region and bridge the height difference between the grating and the waveguide surface.

Benefits of technology

By reducing light scattering, the modulation transfer function (MTF) of the image is significantly improved, resulting in clearer and sharper image display and enhanced imaging performance and visual experience.

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Abstract

The application discloses a diffractive optical waveguide, which comprises a waveguide substrate, the waveguide substrate is provided with at least a coupling-in grating and a coupling-out grating, and light is totally reflected and transmitted towards the coupling-out grating after being coupled into the waveguide substrate from the coupling-in grating; a first auxiliary structure is arranged on the local edge of the coupling-in grating close to the coupling-out grating, the first auxiliary structure has a gradually decreasing height away from the edge of the coupling-in grating; and a second auxiliary structure is arranged on the local edge of the coupling-out grating close to the coupling-in grating, the second auxiliary structure has a gradually decreasing height away from the edge of the coupling-out grating. The diffractive optical waveguide has a better imaging effect.
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