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    Area of Science:

    • Optics and Photonics
    • Display Technology
    • 3D Imaging

    Background:

    • Holographic displays offer realistic 3D visualization but face challenges in achieving wide viewing angles and high resolution.
    • Current systems often require complex optical setups and high-performance spatial-light modulators (SLMs).
    • Combining spatial and time-multiplexing techniques presents a potential solution for overcoming these limitations.

    Purpose of the Study:

    • To propose and demonstrate a holographic display system that combines spatial and time-multiplexing.
    • To achieve a wide horizontal viewing angle (VA) for holographic three-dimensional (3D) displays.
    • To reduce the requirements for the number and frame rate of SLMs and the optical system's numerical aperture.

    Main Methods:

    • The system utilizes multiple planar-aligned spatial-light modulators (SLMs).
    • A shiftable cylindrical lens creates an "equivalent SLM" by seamlessly linking horizontal images from tiled SLMs in a time-sequential manner.
    • A simplified optical structure requiring only one parallel incident beam is employed.

    Main Results:

    • The proposed system successfully realizes a wide horizontal-viewing-angle holographic 3D display.
    • Experimental implementation using two 60Hz phase SLMs achieved a horizontal viewing angle (VA) of 27.5°.
    • The system demonstrates feasibility with low requirements on SLM count, frame rate, and optical numerical aperture.

    Conclusions:

    • The combined spatial- and time-multiplexing approach offers an effective solution for wide-viewing-angle holographic 3D displays.
    • The developed system simplifies optical structure and reduces hardware demands.
    • This method paves the way for more accessible and practical holographic display technologies.