3 stack Archives ⋆ OLED

OLED TV continuing to evolve

2018년 3월 16일/0 코멘트/카테고리: 미분류 /작성자: OLEDNET

At the ‘4th 2018 OLED Korea Conference’ hosted by UBI research on March 7-8, Dr. Han Chang-Wook, Chief Research Fellow of LG Display, made a presentation for the development process of OLED TVs and emphasized the image quality of OLED, design flexibility and expandability.

At first, Dr. Han introduced three core technologies including TFT technology, OLED stack technology, and compensation circuit design applied to OLED TVs. He said, “We changed the TFT as top gate coplanar structure for UHD implementation in bottom gate TFT applied to FHD.” He also mentioned “We changed the WRGB OLED pixel structure from 2 stack structure to 3 stack structure to improve the luminance and color reproduction ratio, and designed the compensation circuit so that it does not affect the OLED even on 8K large screen.”

He commented, “Unlike LCDs that control pixels with local dimming, OLEDs have pixel dimming controls, which allows for full black representation and less halo effects”

Explaining that OLED allows greater design flexibility and expandability because of the self-illuminating properties that does not require backlight, he referred to the mirror display and transparent display applicable to indoors, and the world’s first 88 inch 8K OLED TV and 65 inch rollable OLED TV exhibited at CES 2018.

Dr. Han said “We expect large OLED panel production to be tripled, compared to 2016, with the expansion of production lines and yield improvement in 2018. In addition, the company will be able to ship over 6 million large area OLED panels by 2020 through the expansion of its Paju and Guangzhou plants.” He also announced that the company will increase continuously the production for OLED panels, which were 5% of the total display panels in 2016, by 40% by 2020.

진화를 거듭하고 있는 OLED TV

2018년 3월 15일/0 코멘트/카테고리: 세트 /작성자: OLEDNET

3월 7일 유비리서치가 주최한 ‘2018 OLED 코리아 컨퍼런스’에서 LG Display의 한창욱 수석연구위원은 OLED TV의 발전 과정을 소개하며 OLED의 화질(image quality)과 디자인 유연성(design flexibility), 확장성(expandability)을 강조하였다.

먼저 한 수석연구원은 OLED TV에 적용 된 TFT 기술과 OLED stack 기술, 보상회로 설계 등 3가지 핵심 기술들을 소개하였다. 한 수석연구원은 “FHD에 적용 된 bottom gate TFT에서 UHD 구현을 위해 top gate coplanar 구조로 TFT를 변경하였다”고 설명하였으며, “휘도와 색재현율 향상을 위해 2 stack 구조에서 3 stack 구조로 WRGB OLED 화소 구조를 변경하였으며 8K 대형 화면에서도 OLED에 영향이 없도록 보상 회로를 설계하였다”고 밝혔다.

이어서 한 수석연구원은 OLED의 최대 장점으로 “local dimming으로 화소를 제어하는 LCD와 다르게 OLED는 pixel dimming으로 화소를 제어하기 때문에 완벽한 블랙 표현이 가능하고 윤곽선 주변이 빛나보이는 halo effect가 적다”고 강조했다.

또한, OLED는 back light가 필요 없는 자발광 디스플레이기 때문에 디자인 구현과 확장성이 가능하다고 설명했다. 그 예로 실내에서 적용 가능 한 mirror display와 transparent display를 언급했으며 CES 2018에서 선보인 세계 최초의 88 inch 8K OLED TV와 65 inch rollable OLED TV를 언급하였다.

한편, 한창욱 수석연구원은 “2018년에는 생산라인 확대와 수율 개선을 통해 대형 OLED 패널 생산량이 2016년보다 3배 수준으로 늘어날 것으로 예상된다. 또한 파주와 광저우 공장 증설을 통해 2020년에는 600만장 이상의 대형 OLED 패널 출하가 가능할 것”이라 밝혔다. 또한, 2016년 전체 디스플레이의 5% 수준이었던 OLED 패널 생산량을 2020년까지 40% 이상 끌어올리겠다고 밝혔다.

LG Display, announcement on development trend for OLED TV and latest WOLED device for lighting in IDW 2016

2016년 12월 23일/0 코멘트/카테고리: 포커스온 /작성자: OLEDNET

In IDW(International Display Workshops) 2016 held in Fukuoka Japan from December 7~9, LG Display announced on the development trend for OLED TV and latest WOLED device for lighting, and mentioned that the color area of latest WOLED device for OLED TV increased from 114% to 129% compared to sRGB, and 90% to 99% compared to DCI. In the paper, 3 stack structured 55” UHD OLED TV shows 150cd/m2 in full white screen, 500cd/m2 of luminance in peak white screen, and showed that it lowered the power consumption by 20% compared with 2 stack structure.

Also by introducing WOLED for lighting, LG Display mentioned that lighting WOLED has 3 stack tandem structure with green-red/blue/green-red, where WOLED for OLED TV has 3 stack tandem structure with blue/yellow-green/blue. It showed high efficiency of 90lm/w by applying Ag cathode and light extraction film which the reflectivity is high, and the color temperature is 2,850K which is in the warm white range, CRI showed characteristics of 88. This OLED light will start its production in 3rd quarter of 2017 in 5 generation line.

Meanwhile, LG display exhibited 800 nit 65” UHD OLED TV during OLED summit 2016 held last September in San Diego where they gained much interest compared to 65” curved QD-LCD TV quality, and it is expected that they will introduce OLED TV with improved luminance with more than 1,000 nits next year.

태그 보관용: 3 stack

글