The development of MicroLED technology is closely watched: Professor at Korea University

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PlayNitride leader in technology development

Image: TheElec

Research on MicroLED technology was active in the United States, Taiwan and Europe, while no South Korean companies or institutes were carried out, a South Korean professor noted during a conference on the display industry in Seoul.

Speaking at the SID 2022 review workshop, Hong Moon-pyo, a professor at Korea University, said local industry should continue to monitor MicroLED technology development to gauge how to respond.

MicroLED uses LED chips smaller than 100 micrometers in the form of pixels on the display panel.

South Korean companies Samsung and LG Electronics are launching street signs and televisions using this technology.

However, the core technologies to make these products have been led by Taiwanese companies such as PlayNitride, Hong noted.

MicroLED could have an advantage over competing technologies such as LCD and OLED by making the panel larger, transparent or ultra-small, the professor claimed.

LCD and OLED screens will require glass substrates to grow to around 100 inches in size, but MicroLED doesn’t need that and can use smaller sized tiles to be assembled at that size, Hong said.

MicroLED is also of great interest for ultra-small displays that could be used in augmented and virtual reality devices, he said.

Companies such as PlayNitride were also continuing to develop technologies for the transfer process in MicroLED production, the professor said.

During production, micrometer-sized LEDs are transferred to the substrate, a difficult process that determines the yield and cost of the panels.

Hong noted that the Taiwanese company has the most comprehensive technology in MicroLED production process. PlayNitride currently transfers LED chips to a carrier before transferring them to the substrate, a technology the company calls chip-in-carrier, or CoC.

Pixel combination and inspection is done on the carrier before they are transferred to the backplane substrate, Hong said, allowing the company to easily replace defective chips on the carrier beforehand. .

At the same time, when MicroLED was first commercialized, the transfer process was a big hassle, but it only accounts for 10% of the cost, the professor said.

Interest in fundamental technology around micrometer-sized LED chips is growing, he added.

Still, South Korean companies are ahead of their Chinese and Taiwanese rivals when using OLED technologies.

저작권자 © THE ELEC, Korea Electronics Industry Media 무단전재 및 재배포 금지

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