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[IMID 2018] LG Display, showcased 2-stack RGB OLED for automobile OLED with improved life span.

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At IMID 2018 held in BEXCO, Busan on August 29, Kim Kwan-Soo, research fellow of LG Display presented about a new OLED technology for automotive displays.

Kim said that RGB OLEDs applied to mobile devices and WRGB OLEDs applied to TVs do not satisfy customers’ needs in terms of life span. To solve this issue, he introduced 2 stack RGB OLED in which RGB OLED has the same tandem structure as WRGB.

Because 2 stack RGB OLED can be thick due to adding a layer of CCL (charge generation layer) to the multi-layer structure, HTL is made thinner than before and the charge balance of the emitting layer is optimized.

As a result, the 2-stack RGB OLED shows 1.5 ~ 2 times higher emitting efficiency than the 1-stack RGB OLED. Its lifetime is increased by 4 times on T80 basis.

However, the 2-stack structure has a disadvantage in that it has higher power consumption than the general structure. Thus, it is necessary to make efforts to solve this disadvantage.

[iMiD 2017] JOLED announces printing-type OLED development trend and future road map

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At the ‘IMID 2017 Business Forum’ held in COEX, Seoul from 18th to 19th, Toshiaki Arai, chief technologist of JOLED announced JOLED’s printing technology and future road map.

<JOLED’s Toshiaki Arai chief technologist>

Toshiaki Arai, chief technologist stated that a stable jetting technology at 220 ppi level has been currently secured; high resolution OLED with more than 300 ppi has been developed at Gen 8.5 but there are some issues such as jetting accuracy and stability.

Toshiaki Arai introduced TG-TAOS (top gate-transparent amorphous oxide semiconductors) TFT, which will contribute to saving the unit cost of OLED with excellent performance at low price.

He also announced the future strategy of JOLED, stressing that, instead of small and large OLED dominated by South Korean companies, the middle-sized OLED for tablet and monitor with more than 200 ppi. Joled is the only OLED panel maker that unveiled its 21.6 inch 4K RGB OLED in 2017, using printing process, and has pilot launched.

<JOLED’s 21.6 inch 4K OLED in application of printing method>

On the other hand, according to the Nihon Keizai newspaper in Japan, JOLED is reported to have invested 100 billion yen in mass production of printing-type OLED. In addition, Toshiaki Arai stated that the OLED test samples manufactured by printing process have been provided since this April and the mass production will realize in the second half of 2018.

[IMID 2017] JOLED, printing 방식의 OLED 개발 동향과 미래 로드맵 발표

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지난 18일부터 19일까지 서울 코엑스에서 열린 ‘IMID 2017 Business Forum’에서 JOLED의 Toshiaki Arai chief technologist는 JOLED의 printing 기술과 향후 로드맵 등을 발표하였다.

<JOLED의 Toshiaki Arai chief technologist>

Toshiaki Arai chief technologist는 현재 220 ppi 수준에서 안정적인 jetting 기술을 확보하였다고 밝히며, Gen 8.5에서 300 ppi 이상의 고해상도 OLED도 개발하고 있으나 jetting 정확도와 안정성 등의 이슈가 있다고 언급했다. 이어서 printing OLED에 적용 될 TG-TAOS(top gate-transparent amorphous oxide semiconductor) TFT를 소개하며 낮은 가격으로 충분한 성능을 발휘하기 때문에 OLED 원가 절감에 기여할 것이라고 밝혔다.

이어서 Toshiaki Arai chief technologist는 JOLED의 미래 전략을 소개하며 한국 기업이 주도하고 있는 소형과 대형 OLED 대신 200 ppi 이상의 tablet과 monitor용 중형 OLED에 먼저 집중할 것을 밝혔다. JOLED는 OLED panel 업체 중 유일하게 2017년에 printing 공정을 이용하여 21.6 inch 4K RGB OLED를 공개하였으며 이를 시험 출하 하기도 하였다.

<Printing 방식을 적용한 JOLED의 21.6 inch 4K OLED>

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