Grating waveguide device and waveguide system based on PVG technology

By using polarized volume grating (PVG) technology and waveguide devices with high refractive index materials in AR devices, the rainbow pattern phenomenon caused by ambient light interference is solved, and high-quality image display is achieved, which is suitable for augmented reality display devices under complex ambient light conditions.

CN120010043AActive Publication Date: 2025-05-16SOUTHEAST UNIV
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Patent Information

Application Number
CN202510490977.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-18
Publication Date
2025-05-16
Estimated Expiration
2045-04-18

AI Technical Summary

Technical Problem

The rainbow pattern caused by ambient light interference in augmented reality (AR) devices leads to image display distortion and interference, and the prior art is difficult to completely eliminate this problem.

Method used

Polarized volume grating (PVG) technology is used to form a periodic refractive index modulation structure through the photooriented and self-assembly process of liquid crystal materials. Combined with a waveguide device of high-refractive index materials, multiple total internal reflection propagation is achieved, and the propagation path of light is accurately controlled to avoid ambient light interference.

Benefits of technology

Significantly suppress the rainbow pattern caused by ambient light, improve image display quality and optical performance, and ensure high-definition, distortion-free visual experience under complex ambient light conditions.

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Abstract

The invention discloses a grating waveguide device and waveguide system based on a polarization volume grating technology, and belongs to the technical field of augmented reality display. The device comprises a waveguide substrate and a grating structure, the grating structure adopts a liquid crystal material to form a periodic refractive index modulated PVG through a light-induced orientation and self-assembly process, the polarization state of a light beam can be selectively regulated and controlled, and the rainbow pattern phenomenon caused by ambient light diffraction is inhibited. The efficient diffraction and total internal reflection transmission of the multi-wavelength light beam are realized by optimizing the grating period, the Bragg inclination angle and the waveguide matrix parameters and combining Zemax simulation to optimize the light beam propagation path. The waveguide system can be matched with AR glasses, a head-mounted display and other devices, the intensity of the rainbow lines is remarkably reduced under the complex ambient light condition, and high-definition and distortion-free visual experience is provided.
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