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Related Experiment Video

Updated: Jan 19, 2026

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Angular color variation in micron-scale light-emitting diode arrays.

Shu-Mei Yang, Po-Hsun Wang, Chia-Hsin Chao

    Optics Express
    |September 13, 2019
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    Summary

    This study developed a simulation for micron-scale light-emitting diode (LED) arrays, enhancing light extraction efficiency by up to 113.55% with substrate patterning. Results confirm simulation accuracy for miniLED and microLED devices.

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    Area of Science:

    • Optoelectronics
    • Photonics
    • Semiconductor device physics

    Background:

    • Micron-scale light-emitting diode (LED) arrays are crucial for advanced display technologies.
    • Optimizing light distribution and efficiency in miniLED and microLED devices is an ongoing challenge.
    • Substrate properties significantly impact LED performance, but their effects on light distribution require detailed investigation.

    Purpose of the Study:

    • To develop a simulation scheme for analyzing the light distribution of full-color micron-scale LED arrays.
    • To numerically evaluate the influence of substrate thickness, patterning, and cutting angle on light field pattern, light extraction efficiency (LEE), and color variation.
    • To validate simulation results through experimental comparison with miniLED and microLED devices.

    Main Methods:

    • Development of a novel simulation scheme for light distribution analysis in micron-scale LED arrays.
    • Numerical evaluation of substrate parameters including thickness, patterning, and cutting angle.
    • Experimental validation using 225 × 125 µm² miniLED and 80 × 80 µm² microLED devices.

    Main Results:

    • Simulations showed significant improvements in light extraction efficiency (LEE) with substrate use (up to 67.75% increase).
    • An additional patterned design on green and blue chips further boosted LEE by 113.55%.
    • Experimental results closely matched simulation predictions for both miniLED and microLED devices, with low large angle color variation (Δu'v' as low as 0.015).

    Conclusions:

    • The developed simulation scheme accurately predicts light distribution and efficiency in micron-scale LED arrays.
    • Substrate engineering, including patterning, offers a viable strategy for substantially enhancing LEE in miniLED and microLED devices.
    • Optimized substrate design can lead to improved color uniformity and overall device performance.