红、绿、蓝 Mini-LED 发光特性对色域的影响

摘要：色域在显示器中至关重要。在与工作温度相似的温度下研究了红色、绿色和蓝色倒装芯片微型发光二极管 (LED)(100 μm × 200 μm) 的光-电流-电压 (L–I–V) 特性。理想因子和外部量子效率 (EQE) 的温度依赖性都表明红色 mini-LED中的非辐射损耗较高。我们还通过捕获空间发射映射来说明过驱动电流下红色 mini-LED 的强烈横向发光强度波动。确定了温度和驱动电流对 mini-LED 色度坐标的影响。此外，我们提出了一种驱动电流算法，以最大化不同温度下三色混合光的色域。结果表明，对于自发光 mini-LED 显示器的应用，最大色域对绿色发射更敏感，而增强红色 mini-LED 中的辐射复合可以大大提高净性能。
关键词：显示器、微型发光二极管 (LED)、色域。
期刊：TRANSACTIONSON ELECTRONDEVICES
DOI:10.1109/TED.2019.2906321
设备：GaiaField

The Impact of Luminous Properties of Red, Green, and Blue Mini-LEDs on the Color Gamut

Abstract：The color gamut is crucial in a display. The light-current-voltage (L–I–V) characteristics of red, green, and blue flip chip miniature light-emitting diodes (LEDs) (100 μm × 200 μm) were investigated at temperatures similar to those used in operation.
Both the ideal factor and the temperature dependence of the external quantum efficiency (EQE) indicate higher non-radiative losses in the red mini-LEDs. We also illustrate the intense lateral luminous intensity fluctuations of the red mini-LEDs under overdrive currents by capturing spatial emission mapping. The effect of temperature and driving current on the chromaticity coordinates of the mini-LED was determined. In addition, we propose a driving current algorithm to maximize the color gamut of trichromatic mixed light at different temperatures. The results show that for the application of self-illuminating mini-LED displays, the maximum color gamut is more sensitive to green emission, while enhancing the radiative recombination in the red mini-LED can greatly improve the net performance.
Index Terms：Displays ,mini-light-emitting diode(LEDs), color gamut.