Seoul Viosys Overcomes Efficiency Challenges of Micro LED to be a Game-Changer of Display Industry and Starts Mass Production

ANSAN, South Korea – Seoul Viosys (KOSDAQ: 092190), the leading global compound semiconductor device provider and a subsidiary of Seoul Semiconductor, announced Seoul Viosys and the Santa Barbara’s Solid State Lighting & Energy Electronics Center (SSLEEC) team led by Nobel Prize-winning physics Professor Shuji Nakamura, of University of California, Santa Barbara (UCSB) succeeded in developing blue and green micro LEDs with 1 μm diameter and addressed issues related to red micro LEDs of less than 70 μm, which could not be mass-produced due to a decrease in External Quantum Efficiency (EQE). Seoul Viosys has started mass production and expects it will be a game-changer in the global display industry.

Seoul Viosys and SSLEEC team have overcome the challenges of decrease in External Quantum Efficiency and production yield and Seoul Viosys is successfully mass-producing products (MC04, MC02) to which 70μm red micro LED is applied. In addition, it is preparing to release 30μm one-pixel Micro LED products in the second half of 2021 and 10μm one-pixel Micro LED products in 2022.

Seoul Viosys supported the SSLEEC team for 20 years to develop micro LEDs with a diameter of 1μm and made it possible to produce ultra-small micro LED solutions and improve the brightness by increasing the External Quantum Efficiency of red Micro LEDs by 150%, which had been limited to apply because the smaller the size, the lower the light-emitting efficiency. (Thesis Name: Optics Express 5787, Vol. 28, No. 4 (2020) / Appl. Phys. Lett. 116, 071102 (2020))

Accordingly, Seoul Viosys is expecting a rapid commercialization of all display applications such as smartphones, ARs and VRs through improved micro LED technology.

“According to our principle to supply new products first to the companies that respect intellectual property rights, we will first supply the new ultra-small size 10μm and 30μm one-pixel Micro LEDs to the customers who have purchased our products (MC04, MC02, Wicop MINI, etc.) and are using them,” said an official of Seoul Viosys.

Seoul Viosys regularly presents the results of its joint research with Professor Shuji Nakamura of UCSB at new technology seminars for researchers of Seoul Semiconductor and Seoul Viosys. Micro LED online seminar video held on July 2 is now available on Seoul Semiconductor’s YouTube channel. Please visit https://bit.ly/2UxRhLS.

※ External Quantum Efficiency (EQE): The ratio of the number of photons emitted by the LED divided by the number of injected electrical charges

(a) Electroluminescence (EL) Wavelength Spectrum of Red Micro LED (b) Blue and green Micro LEDs with a diameter of 1 μm viewed under an electron microscope

* Only part of the seminar has been excerpted and disclosed here due to time and security concerns. If necessary, please contact the sales department.

Reference: TrendForce, a Taiwanese market research institute, predicted in a recent report that the annual sales of Micro LED chips for TVs will increase to an annual average of 250% from 2021 to 2025. It expected that the size of the market, which was only USD 23 million in 2021, will increase 150 times in just five years.

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