Investigation of Enhanced Ambient Contrast Ratio in Novel Micro/Mini-LED Displays

Ke Zhang; Tingting Han; Wai-Keung Cho; Hoi-Sing Kwok; Zhaojun Liu

doi:10.3390/nano11123304

Investigation of Enhanced Ambient Contrast Ratio in Novel Micro/Mini-LED Displays

Nanomaterials (Basel). 2021 Dec 6;11(12):3304. doi: 10.3390/nano11123304.

Authors

Ke Zhang^{1

2}, Tingting Han³, Wai-Keung Cho², Hoi-Sing Kwok², Zhaojun Liu^{1

2}

Affiliations

¹ Department of Electrical and Electronic Engineering, Southern University of Science and Technology, Shenzhen 518055, China.
² State Key Laboratory of Advanced Displays and Optoelectronics Technologies, The Hong Kong University of Science and Technology, Hong Kong 999077, China.
³ Shenzhen Refond Optoelectronics Co., Ltd., Shenzhen 518055, China.

Abstract

In recent years, ambient contrast ratio (ACR) has become very critical for advanced outdoor displays, including transparent displays, portable displays, and so on. In this work, the ACR of typical flat panel displays was introduced, while LED-based displays showed distinctive advantages. Micro-LED displays with a different pitch of 10 μm, 15 μm, 30 μm, and 60 μm were fabricated and characterized. Various mini-LED and micro-LED panels were systematically investigated in the aspect of brightness, reflection phenomenon, and ACR to reveal their enormous potential for outdoor applications. Through a series of experiments and comparisons, three methods were proposed to further improve the ACR of LED-based panels, including optical method, antireflection coating, and structure optimization.

Keywords: ambient contrast ratio; emissive display; mini-LED and micro-LED display.

Abstract

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