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Super achromatic wide-angle quarter-wave plates using multi-twist retarders.

Lingshan Li, Michael J Escuti

    Optics Express
    |March 17, 2021
    PubMed
    Summary

    This study introduces a novel multi-twist retarder (MTR) quarter-wave plate (QWP) for advanced displays. This new QWP offers superior achromaticity and a wide viewing angle, crucial for virtual reality and augmented reality applications.

    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Display Technology

    Background:

    • Quarter-wave plates (QWPs) are essential for color uniformity and image resolution in virtual reality (VR) and augmented reality (AR) displays.
    • Existing achromatic wide-angle QWPs are often complex and have limited performance.
    • Previous multi-twist retarder (MTR) QWPs showed promise but struggled with polarization control in blue-violet light for LED-based systems.

    Purpose of the Study:

    • To theoretically investigate a new type of MTR QWP with enhanced achromaticity and wide-angle performance.
    • To address the limitations of previous MTR QWPs in blue-violet light spectrum.
    • To enable precise polarization control for next-generation AR/VR headsets.

    Main Methods:

    • Theoretical investigation of a novel MTR QWP design.

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  • Analysis of achromaticity across the violet to red spectrum.
  • Evaluation of viewing angle performance up to ±45°.
  • Assessment of reflection luminance leakage.

    • Main Results:

    • Achieved super achromaticity from violet to red with an average ellipticity of 43°.
    • Maintained a wide viewing angle up to ±45° for precise polarization control.
    • Reported low average reflection luminance leakage of 0.15% and maximum leakage of 0.23%.

    Conclusions:

    • The proposed MTR QWP offers significant improvements in achromaticity and wide-angle performance for AR/VR displays.
    • This design enables precise polarization control within the field-of-view of current headsets.
    • The low leakage characteristics make it a promising component for reducing polarization issues and enhancing image resolution in future displays.