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2023-03-22
Micro LED reduces heat generation by 40%! This research is supported by Samsung
According to Korean media, Li Guangjiong, President of the Korean Academy of Science and Technology (KAIST), announced on the 22nd that the team led by Professor Sang Hyun Kim of the Department of Electrical and Electronic Engineering has solved the problem of reduced efficiency in the miniaturization trend of Micro LED devices by changing the "epitaxial structure".
The KAIST research team introduced that to manufacture Micro LEDs, the epitaxial structure of gallium nitride crystals stacked on the wafer must be cut through an etching process to form pixels. The etching process is accompanied by a plasma based process, which can lead to defects on the pixel side.
The smaller the pixel size and the higher the resolution, the greater the adverse impact of these defects, and the greatly reduced efficiency of Micro LED devices. In the past, as epitaxial structures grew, defects were then subjected to post processing, and this improvement was limited.
KAIST research team has re studied the phenomenon of device efficiency decline during miniaturization. Professor Sang Hyun Kim believes that efficiency decline is an obstacle to miniaturization of Micro LEDs, which can be solved through epitaxial structure design.
Therefore, the research team designed a structure that is completely insensitive to lateral defects.
This structure is a method of preventing electrons from deflecting to one side by adjusting the thickness of quantum potential barriers. Compared to previous structures, this structure can reduce the heat generated when driving displays by about 40%, solving the problem of reduced efficiency caused by miniaturization of Micro LED devices. This is of great significance for the research on commercialization of ultra high resolution Micro LED displays.
It is reported that this study was published in the international journal Nature Communications on March 17th.
It is worth noting that this research was conducted with the support of Samsung Future Technology Development Center. According to experts, Display understands that KAIST also disclosed a research achievement supported by Samsung's Future Technology Development Center in 2022.
This achievement belongs to the research team led by Professor Sang Hyun Kim of KAIST School of Electrical and Electronic Engineering, and was published in July 2022.
It is reported that this research achievement is a 3D stacked integrated red Micro LED, and a 1600 PPI equivalent Micro LED display has been successfully developed, which can be used in AR/VR.
The monolithic 3D aggregation method used in the research provides guidance for the development of the next generation of ultra high resolution displays. Professor Sang-Hyun Kim said that in the future, similar processes can be applied to produce full-color displays that include red, green, and blue light.
