Abstract
Micro-LED (light-emitting diode) is a potentially disruptive display technology, while power consumption is a critical issue for all display devices. In this paper, we develop a physical model to evaluate the power consumption of micro-LED displays under different ambient lighting conditions. Both power efficiency and ambient reflectance are investigated in two types of full color display structures: red/green/blue (RGB) micro-LEDs, and blue-LED pumped quantum dots color-conversion. For each type of display with uniform RGB chip size, our simulation results indicate that there exists an optimal LED chip size, which leads to 30–40% power saving. We then extend our model to analyze different RGB chip sizes, and find that with optimized chip sizes an additional 12% average power saving can be achieved over that with uniform chip size.
Highlights
Micro-LED displays with high peak luminance, true dark state, high resolution, wide color gamut and long lifetime are emerging as next-generation displays [1,2,3,4]
Because the power consumption is defined as the luminance intensity divided by power efficiency, we can find the optimal LED chip size when the ratio of g(x) to f (x) has a minimum
With the same analysis process, we find the optimal LED chip size for 3840 × 2160 smartphone is 6x FOR
Summary
Micro-LED displays with high peak luminance, true dark state, high resolution, wide color gamut and long lifetime are emerging as next-generation displays [1,2,3,4]. Red LEDs are typically fabricated by growing AlGaInP epilayers on GaAs substrates, while green and blue LEDs are produced by depositing InGaN epilayers on sapphire substrates In such a RGB display panel, millions of micro-LED chips are transferred from the corresponding semiconductor wafers to the display substrate through mass transfer processes [5,6,7]. Density stays at peak EQE, while the luminance is modulated by changing the duty ratio in each frame In this thispaper, paper, evaluate the power consumption bothoftypes of micro-LED displays, In wewe evaluate the power consumption of bothoftypes micro-LED displays, including including chips andpumped blue LEDs color conversion, different lighting.
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