Coupling-in device design method and coupling-in device

CN119310736APending Publication Date: 2025-01-14CETHIK GRP
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Patent Information

Application Number
CN202411655698.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-19
Publication Date
2025-01-14

AI Technical Summary

Technical Problem

In the prior art, parallel beams at different angles of the micro-light machine interact with IG inconsistent times, resulting in poor angle uniformity and brightness uniformity.

Method used

By calculating the diffraction angle, translation distance and number of times the beam interacts with the IG element in the optical waveguide, partition modulation is performed to optimize the type and parameters of the grating to ensure that the beams at different angles have good brightness and uniformity after passing through the IG area.

Benefits of technology

It effectively improves the angle uniformity and brightness uniformity of parallel beams in different angles of the micro-light machine in the coupled device, ensuring the light field uniformity and brightness uniformity in the Eyebox.

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Abstract

The invention provides a coupling-in device design method and a coupling-in device, and the method comprises the steps: calculating the diffraction angle of a light beam in an optical waveguide according to the incident angle and the central wavelength of the light beam, and the period and the refractive index of an IG element, the incident angle being the included angle between the light beam emitted by a low-light machine and the IG element; according to the thickness and the diffraction angle of the optical waveguide, calculating the translation distance when the incident beam interacts with the IG element again after primary total reflection; according to the diameter and the distance of the IG element, the number of times of interaction between the incident beam and the IG element area is calculated; according to the number of times, the IG element is partitioned, and partitioned modulation is carried out, so that it is guaranteed that the parallel light beams at different angles have good brightness and uniformity after passing through the IG area.
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