Research and development of new technology, successful breakthrough of MicroLED display resolution limits

According to Business Korea, Korean research team KAIST has come up with a technology that could break the resolution limit of Micro LED displays.The new technology is expected to be used to produce small high-resolution displays for devices such as VR/AR.

KAIST announced Thursday that a research team led by professor Kim sang-hyun of the department of electronic engineering has developed a technology that USES semiconductor manufacturing to produce more than 63,500 pixels per inch.

Micro LED displays use micron-sized inorganic light-emitting diodes as pixels.For this reason, the red, green and blue (RGB) pixels must be closely aligned, but the LED materials that produce the three RGB colors are different, so each LED must be transcribed to the display substrate.

However, many technical difficulties will arise in this process, such as the size limitation of LED transfer head, mechanical accuracy and reduced yield, so it is difficult to apply this technology to ultra-high resolution displays.

Now, KAIST's research team has developed a new method for producing high-resolution Micro LED display devices.They stack active layers of red, green and blue leds in a 3D space before using a semiconductor patterning process.To address issues such as color interference and the efficiency of each tiny pixel during the vertical stacking of RGB leds, the team placed filter-like insulation on the bonding surface, eliminating 97 percent of the red and blue interference light.Finally, the team managed to achieve a high resolution of more than 60,000 pixels per inch, increasing the efficiency of the microleds.