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    Area of Science:

    • Optoelectronics
    • Display Technology
    • Semiconductor Devices

    Background:

    • Micro-light emitting diodes (micro-LEDs) offer high efficiency through sidewall emission.
    • Material differences between red (AlGaInP) and blue/green (InGaN) micro-LEDs lead to mismatched angular light distributions.
    • This mismatch causes visually noticeable color shifts in RGB micro-LED displays.

    Purpose of the Study:

    • To analyze and understand the angular emission distributions of different colored micro-LEDs.
    • To propose and validate a novel micro-LED device structure for mitigating color shift.
    • To maintain high light extraction efficiency while correcting angular distribution discrepancies.

    Main Methods:

    • Experimental characterization of angular emission patterns for red, green, and blue micro-LEDs.
    • Optical simulations to model and verify light distribution behavior.
    • Design and fabrication of a modified micro-LED structure incorporating a top black matrix and taper angle.

    Main Results:

    • Accurate agreement achieved between simulated and experimental angular distributions for RGB micro-LEDs.
    • The proposed device structure significantly reduced color shift in micro-LED displays.
    • The modified structure maintained a reasonably high light extraction efficiency.

    Conclusions:

    • The developed micro-LED structure effectively addresses the color shift issue caused by material-dependent angular distributions.
    • This advancement is crucial for achieving accurate color reproduction in next-generation RGB micro-LED displays.
    • The integration of a black matrix and taper angle presents a viable solution for uniform color performance.