We present studies of the color uniformity and thermal stability of a flexible and transparent ${32}\times {32}$ mini-LED array on polyethylene terephthalate (PET) substrate up to a brightness rating of 5000 nits at room temperature, whose brightness is required for outdoor display applications. Surprisingly, even at 5000 nits, the temperature variation on the surface of the LED array is less than 9 °C, despite the relatively low thermal diffusivity of the polymer substrates. The average surface temperature was 33 °C. This indicates that the heat dissipation of the fabricated LED array is superior with even a polymer substrate. Further, the narrow electroluminescent (EL) emissions from the mini-LED array help to realize wider color gamut than Rec. 2020 color gamut in display applications. The color differences from the EL spectra were calculated at three different brightness. The calculated values are far less than the color discrimination threshold of the human eye corresponding to 0.005 at all testing brightness and meet the display industry requirement for color difference.

中文翻译：

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柔性透明 InGaN/GaN 多量子阱 Mini-LED 阵列的色差和热稳定性

我们研究了聚对苯二甲酸乙二醇酯 (PET) 基板上的柔性透明 ${32}\times {32}$ mini-LED 阵列的颜色均匀性和热稳定性，室温下亮度等级高达 5000 尼特，其亮度是户外显示应用所必需的。令人惊讶的是，即使在 5000 尼特时，LED 阵列表面的温度变化也小于 9°C，尽管聚合物基板的热扩散率相对较低。平均表面温度为 33 °C。这表明即使是聚合物基板，所制造的 LED 阵列的散热性能也非常出色。此外，来自迷你 LED 阵列的窄电致发光 (EL) 发射有助于实现比 Rec 更宽的色域。2020 显示应用中的色域。EL 光谱的颜色差异是在三种不同亮度下计算的。在所有测试亮度下，计算值均远小于0.005对应的人眼颜色辨别阈值，满足显示行业对色差的要求。