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Updated: Oct 12, 2025

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Ultrathin miniLED backlight system using optical film with microstructures.

Qibin Feng, Huili Xiao, Ling Yang

    Applied Optics
    |November 22, 2021
    PubMed
    Summary

    MiniLED backlight units (BLUs) offer improved display contrast and reduced thickness. This study introduces a novel total-inner-reflection design for miniLED BLUs, enhancing uniformity and practicability.

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    Area of Science:

    • Optics and Photonics
    • Display Technology
    • Materials Science

    Background:

    • Miniature Light Emitting Diodes (miniLEDs) are increasingly used in backlight units (BLUs) for displays.
    • Current miniLED BLUs often rely on diffuser films and secondary lenses, adding thickness and complexity.
    • Improving display contrast and reducing device thickness are key goals in display technology.

    Purpose of the Study:

    • To propose a novel design method for miniLED BLUs based on total internal reflection.
    • To optimize the microstructure profile for maximum reflected ray power.
    • To evaluate the uniformity and practicability of the designed miniLED BLU.

    Main Methods:

    • A total-inner-reflection-based design approach was developed for microstructures.

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  • Microstructure profiles were optimized to maximize the power of reflected rays.
  • Simulations and experimental tests were conducted to assess performance.

    • Main Results:

    • The designed miniLED BLU achieved satisfactory uniformity at a source-screen gap of 1 mm.
    • The proposed method avoids the need for diffuser films and secondary lenses.
    • The design resulted in an ultrathin backlight unit.

    Conclusions:

    • The total-inner-reflection-based design method offers a practical solution for miniLED BLUs.
    • This approach enables thinner and more uniform displays.
    • The designed miniLED BLU demonstrates high practicability due to its ultrathin profile and relaxed positioning requirements.