Large-angle oblique incidence near-to-eye display system and hologram generation method

By constructing a virtual oversampling grid and using the Shifted angular spectrum method for light field propagation calculation, combined with a phase prediction neural network, the problem of insufficient sampling bandwidth caused by the limited pixel spacing of the spatial light modulator under large-angle oblique incidence conditions is solved, achieving efficient hologram generation and image quality improvement.

CN122085531APending Publication Date: 2026-05-26SHANGHAI JIAOTONG UNIV
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Patent Information

Application Number
CN202610457042.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-08
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing technologies, the limited pixel spacing of spatial light modulators under large-angle oblique incidence conditions results in insufficient physical sampling bandwidth, which in turn causes spectral aliasing, bandwidth truncation, and significant degradation of high-frequency details and contrast in reconstructed images.

Method used

A method for generating holograms from off-axis projection at large angles of oblique incidence is proposed. This method involves obtaining the initial phase distribution of a reflective silicon-based liquid crystal spatial light modulator, constructing a virtual oversampling grid, building a modulated light field on the extended high-resolution grid, superimposing the linear phase term corresponding to the oblique incidence, performing propagation calculations using the Shifted angular spectrum method, and reconstructing the light field distribution by combining it with a phase prediction neural network.

Benefits of technology

While maintaining high quality, it significantly improves computational efficiency and accelerates generation capabilities, enabling rapid hologram generation and enhancing image computational efficiency and generation speed.

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Abstract

The invention relates to a wide-angle oblique incidence-oriented near-to-eye display system and a hologram generation method, and the method comprises the steps: obtaining the initial phase distribution of a reflection-type silicon-based liquid crystal spatial light modulator plane, and enabling the initial phase distribution to have a physical resolution; a virtual oversampling grid is constructed, the initial phase distribution is mapped to an expanded high-resolution grid, and the sampling interval of the expanded high-resolution grid is smaller than the physical sampling interval; constructing a modulation light field on the expanded high-resolution grid, and superposing a linear phase term corresponding to oblique incidence; carrying out propagation calculation on the modulated light field by adopting a Shifted angular spectrum method to obtain high-resolution light field distribution of a target plane; the high-resolution light field distribution of the target plane is mapped back to the physical resolution through average downsampling, a reconstructed image is obtained, and the method has the advantages that on the premise that high quality is kept, the calculation efficiency and the generation acceleration capacity are greatly improved, and the technical effect that hologram generation is rapidly completed is achieved.
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