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Large-size PVG-based waveguide simulation and uniformity optimization for AR-HUD.

Ran Wei, Canran Yang, Chuang Wang

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    |November 14, 2024
    PubMed
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    Researchers developed a new simulation method for polarization volume grating (PVG) waveguide technology in augmented reality head-up displays (AR-HUDs). This method optimizes large-size diffractive displays for improved uniformity and efficiency in AR applications.

    Area of Science:

    • Optics and Photonics
    • Display Technology
    • Optical Engineering

    Background:

    • Polarization volume gratings (PVGs) are diffractive optical elements increasingly used in augmented reality (AR) near-eye displays (NEDs).
    • PVG-based AR head-up displays (AR-HUDs) face challenges with large exit pupils and uniform efficiency.
    • A systematic simulation method for these large-scale PVG applications is currently lacking.

    Purpose of the Study:

    • To introduce a novel simulation analysis method for large-size PVG-based waveguide technology tailored for AR-HUD applications.
    • To address the need for systematic simulation in designing efficient and uniform large-aperture diffractive waveguides for AR-HUDs.

    Main Methods:

    • Development of a unique simulation analysis method utilizing large-size PVG waveguide technology.

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  • Implementation of a self-built particle swarm optimization (PSO) algorithm for waveguide structure optimization.
  • Simulation performed on a 290 mm × 160 mm × 3 mm waveguide with a 600 mm eye relief distance.

    • Main Results:

    • Achieved binocular field of view uniformity of 35.37% within a 100 mm × 50 mm eye box.
    • Attained monocular uniformity values of 31.65% and 32.48%.
    • Demonstrated the effectiveness of the PSO algorithm in optimizing waveguide parameters for uniformity.

    Conclusions:

    • The proposed simulation method provides a viable approach for designing large-size diffractive waveguides for AR-HUDs.
    • The results offer guidance for enhancing uniformity and efficiency in future AR-HUD optical systems.
    • This work contributes to the advancement of AR display technology through optimized diffractive optical elements.