Explore Luminance Attenuation and Optical Crosstalk of RGB Mini Light-Emitting Diode Via Microscopic Hyperspectral Imaging
IEEE Journal of the Electron Devices Society(2022)
摘要
In this article, we experimentally and quantitatively investigate the luminance attenuation for red, green, and blue mini light-emitting diodes (LEDs), and the optical crosstalk in the RGB mini-LED array under different working currents via the microscopic hyperspectral imaging technique. The evaluation metrics of luminance attenuation for one single mini-LED subpixel and luminance influence among all three colored mini-LEDs are well defined to quantitatively describe the optical crosstalk among three mini-LED subpixels in the array. We also compare the size-dependent behaviors of luminance attenuation for blue and green mini-LEDs with an emission peak of about 465 nm and 529 nm, respectively. The minimum pixel pitch of blue and green mini-LEDs with different chip sizes is obtained through optical simulation based on LightTools software, so that the optical crosstalk can be reduced. Finally, we believe that this study could provide a useful guidance for selecting suitable working current conditions while driving the mini-LED display with suitable pixel size and pixel pitch to reduce both the optical and color crosstalk in the mini-LED display.
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关键词
Optical crosstalk, Attenuation, Light emitting diodes, Current density, Optical imaging, Optical attenuators, Indexes, Mini-LED, microscopic hyperspectral imaging, optical crosstalk, luminance attenuation
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