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Ruifeng Optoelectronic Mini LED team, together with Southern University of Science and Technology and the State Key Laboratory of Advanced Display and Optoelectronic Technology of Hong Kong University of Science and Technology, has published the work of the internationally famous academic journal Nanomaterials (2021, 11(12), 3304), An Investigation of Enhanced Ambient Contrast Ratio in Novel Micro/Mini-LED Displays was published online Displays, part of the special issue of Quantum Dots and Mini LED Displays 2.0. The academic editors of the paper are Ivan Mora-Sero, the Department of Electrical and Electronic Engineering, Southern University of Science and Technology, and the State Key Laboratory of Advanced Display and Optoelectronics Technology, Hong Kong University of Science and Technology. Tingting Han, director of Ruifeng Optoelectronics Mini LED Team, is the corresponding author.

In recent years, displays are not limited to mobile phones, TVS, and tablets. Many emerging applications such as immersive stage shows, AR glasses, and smartwatches require good outdoor display quality and stability. Ambient light contrast (ACR) refers to the contrast degree of the light and dark of the display screen under a certain ambient light illumination, which is an important factor to reflect the display. ACR has been widely used to estimate the readability of semi-reflective liquid crystal displays (LCDS) in sunlight. Usually LCD products are not ideal for outdoor display because of their low light efficiency. This concept is also extended to other flat panel displays (FPD), such as OLeds. OLED is not suitable for outdoor applications due to its relatively low efficiency and fast degradation rate at large current densities, which easily leads to insufficient brightness. In addition, the instability of organic materials prevents them from being exposed to ambient conditions such as high temperatures or high humidity. In recent years, LED displays have attracted great attention in many fields due to their superior characteristics such as spontaneous light, high brightness and high efficiency, low power consumption, long life and a wide range of working application environments, and are considered as highly promising candidates for next-generation displays. As self-lighting devices, mini-LED and micro-LED have significant advantages of high brightness, high contrast and good stability, which are more suitable for low-power applications and are expected to perform well in outdoor applications.

The development of Mini-LED display and micro-LED display

From the development of mini-LED and micro-LED displays, the panel screen of mini-LED display gradually increases, while the pixel spacing of micro-LED display tends to decrease. Therefore, ambient contrast (ACR) becomes critical for advanced outdoor displays (including transparent displays, portable displays, etc.). The paper presents ACR for typical flat panel displays, while LED-based displays show clear advantages. Micro-led displays with different spacing of 10 μm, 15 μm, 30 μm and 60 μm were manufactured and characterized. Various mini-LED and micro-LED panels (provided by Ruifeng Optoelectronics) were systematically studied and analyzed in terms of brightness, reflection phenomenon and ACR. To reveal their great potential for outdoor applications. Through a series of experiments and comparisons, three methods are proposed to further improve the ACR of LED panels: optical method, antireflection film and structure optimization.

Basic Information of the paper

Journal title: Nanomaterials

Authors: Ke Zhang1,2, Tingting Han3, Wai-keung Cho2, Hoi-sing Kwok2, Zhaojun Liu1,2,*

Units:

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

Academic Editor: Ivan Mora-Sero

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

Paper links: https://www.mdpi.com/2079-4991... (Click on the link for direct access to the paper!)