KAIST Breakthroughs Resolution Limitation of Micro LED Displays with its New Technology

The Korea Advanced Institute of Science and Technology (KAIST) has developed a new technology which overcomes the bottleneck of Micro LED display resolution, reported Business Korea. The new technology will support the production of small size Micro LED displays with high resolution targeting AR and VR applications.

In January 6, KAIST announced that Professor Kim Sang-hyun and his research team of the Department of Electrical and Electronic Engineering have developed a Micro LED display with a resolution of 63,500 pixel per inch (ppi) with semiconductor fabrication technology.

(Image: Pixabay)

Micro LED displays use micron size inorganic LED as a pixel and RGB pixels must be arranged densely to achieve high performance display. However, RGB LEDs are made from different materials and they have to be transferred separated onto display backplane.

Given the size and the materials of Micro LED chips, the manufacture process becomes very challenging. The size limitation of the LED transfer head, the mechanical accuracy limitation, as well as the yield issue, are all barriers of Micro LED display production. As a result, it is difficult to apply the technology for ultra-high resolution displays.

The KAIST research team developed a method for production ultra-high resolution Micro LED displays. The researchers used substrate bonding technology to 3D stack RGB LED active layers. Then they put an insulating film with filter function on the bonding surface, eliminating 97% of red-blue interference light.

They team further investigate the LED pixels systematically with photoluminescence analysis and computer simulation to improve the efficiency of Micro LED.

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