Ruifeng Optoelectronics MiniLED team, together with southern university of science and technology, the State Key Laboratory of Advanced Display and Optoelectronic Technology of the Hong Kong University of Science and Technology, published online in the internationally renowned academic journal "Nanomaterials ( 2021, 11(12), 3304", published online entitled "Investigation of Enhanced Ambient in New Micro/MiniLED Displays" Contrast Ratio in Novel Micro/Mini-LED Displays) (this paper belongs to the special issue of Quantum Dots and MiniLED Display 2.0).
The academic editor of the paper is Iván Mora-Seró, the Department of Electrical and Electronic Engineering of Southern University of Science and Technology, the State Key Laboratory of Advanced Display and Optoelectronic Technology of the Hong Kong University of Science and Technology, and Han Tingting, Director of Ruifeng Optoelectronics MiniLED Team, as the corresponding author.
In recent years, displays have not been limited to mobile phones, TVs, and tablets. Many emerging applications, such as immersive stage performances, AR glasses, and smartwatches, require good outdoor display quality and stability. Ambient light contrast ratio (ACR) refers to the contrast between the brightness and darkness of the display display reflected in a certain ambient illumination, which is an important factor reflecting the display. ACR has been widely used to estimate the readability of transflective liquid crystal displays (LCDs) in sunlight.
Usually LCD products are often less effective in outdoor displays because of their low light efficiency, and this concept has also been extended to other flat panel displays (FDS), such as OLED. OLEDs are not suitable for outdoor applications because of their relatively low efficiency and rapid degradation rate at large current densities, which can easily lead to insufficient brightness.
In addition, the instability of organic materials makes it impossible to expose them to surrounding environments such as high temperature or high humidity conditions. In recent years, LED displays have attracted great attention in many fields due to their superior characteristics such as self-illumination, high brightness and high efficiency, low power consumption, long life and a wide range of working application environments, and are considered to be promising candidates for the next generation of displays. As self-illuminating devices, MiniLED and Micro LED have the 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.
From the perspective of the development of MiniLED and Micro LED displays, the panel screen of MiniLED displays has gradually increased, while the pixel pitch of Micro LED displays tends to decrease. As a result, ambient contrast ratio (ACR) becomes critical for advanced outdoor displays, including transparent displays, portable displays, and more.
The paper describes the ACR of a typical flat panel display, while LED-based displays show clear advantages. Micro-LED displays with different pitches of 10 μm, 15 μm, 30 μm and 60 μm were manufactured and characterized, and various MiniLED and Micro LED (provided by Fraser Optoelectronics) panels were systematically studied and analyzed from the aspects of brightness, reflection phenomena and ACR to reveal their great potential in outdoor applications. Through a series of experiments and comparisons, three methods to further improve the LED panel ACR are proposed: optical method, anti-reflection film and structural optimization. (Source: Ruifeng Optoelectronics)
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