Ar near-eye display method with reduced rainbow artifacts

By employing a two-dimensional diffractive waveguide matrix and a position-wavelength-emission angle mapping model in AR near-eye display devices, the problems of rainbow light and field of view occlusion were solved, achieving effective suppression of rainbow light and virtually no field of view occlusion, thus improving display quality and production yield.

CN122131493APending Publication Date: 2026-06-02GUANGZHOU GUDONG INTELLIGENT TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGZHOU GUDONG INTELLIGENT TECHNOLOGY CO LTD
Filing Date
2026-03-27
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Existing diffractive waveguide technology has a series of problems in terms of rainbow light suppression, field of view obstruction, and thin and light design. It is difficult to effectively reduce the visibility of rainbow light while maintaining the thin and light structure of the waveguide, while avoiding obstructing the user's field of view and taking into account the feasibility of mass production.

Method used

Multiple diffractive waveguides are used to form a two-dimensional matrix, which is distributed in the area above the lens. The exit angle of beams of different wavelengths is controlled by the position-wavelength-exit angle mapping model, so that the exit angle deviation on the exit pupil plane is dispersed in two-dimensional space. Combined with the periodic design of the coupling in, turning and coupling out gratings, the efficient transmission and uniform distribution of the beam are ensured, and the assembly error is compensated by the calibration step.

Benefits of technology

It significantly reduces the perceptibility of rainbow light, improves the color purity and imaging quality of displayed images, reduces sensitivity to assembly precision, and improves production yield and user viewing experience.

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Abstract

This invention discloses an AR near-eye display method that reduces rainbow light, belonging to the field of augmented reality near-eye display technology. It solves the problem of significant rainbow light and visual obstruction caused by existing diffraction waveguides. In this method, the RGB beam emitted from the display optical engine is coupled into a diffraction waveguide matrix distributed in the area above the lens. The emission angle of each diffraction waveguide is controlled according to a pre-established position-wavelength-emission angle mapping model θ(x,y,λ)=θ0+γ·(x+y)·(λ-λ0), so that the emission angle deviation of different wavelengths is dispersed in two-dimensional space. The projected area of ​​the diffraction waveguide matrix occupies ≤2% of the lens. This AR near-eye display method that reduces rainbow light can significantly suppress rainbow light and is mainly used in head-mounted AR glasses to achieve a thin, lightweight, low-artifact, high-quality display.
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