At UBI Research’s ‘2022 OLED Korea Conference Tutorial’ held on April 6th-8th, Dr. Jae-Jin Yoo from the Department of Electrical and Computer Engineering at Seoul National University gave a presentation on, ‘An Overview of OLED Materials and Devices’.

Dr. Yoo explained the paradigm and market prospect of OLED for mobile devices, the structure of each layer, and the light emitting material. Although LCD is still leading the market by introducing mini-LED and other technologies, it is predicted that OLED will lead the display market in the future.

Dr. Yoo explained that among the latest technologies, “LTPO TFT is a technology newly applied to mobile by supplementing the shortcomings of LTPS TFT and oxide TFT process. LTPO TFT is a double-designed display with low electron mobility but no leakage current by changing at least one transistor to oxide in the LTPS TFT process”. He also explained, “In still images, LTPS TFT needs to be driven at 60Hz to maintain the brightness of the screen due to high leakage current, but for oxide TFTs, 1Hz operation is possible because of low leakage current.” Dr. Yoo added, “Although there is an issue that the process of LTPO TFT is more complicated than that of LTPS TFT, it can reduce the total power of mobile devices by 10~15% and it has the advantage that it can be


applied to AOD (Always on Display).” 

Next, introducing the OLED deposition method and vapor deposition machine, he explained that if the 8.5 generation vertical deposition method, which is currently an issue for IT, is commercialized, it has many advantages in terms of productivity and is a much anticipated technology.

‘2022 OLED Korea Conference’ was a conference for exchange of ideas, business relationships, and partnerships with renowned speakers from major companies in the display industry from all over the world. ‘2022 OLED Korea Conference’ held a business conference on the 7th and 8th, beginning with a tutorial on April 6th.