• Title/Summary/Keyword: OLED

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2.2" Digital driving AMOLED One-chip Solution for Mobile Application

  • Bae, Han-Jin;Kim, Seung-Tae;Lim, Ho-Min;Ha, Won-Kyu;Lee, Jae-Do;Kim, Ji-Hun;Kim, Hak-Su;Han, Chang-Wook;Tak, Yoon-Heung;Ahn, Byung-Chul
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.127-130
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    • 2008
  • A 2.2" QVGA($320{\times}240$) 262,114 color AMOLED module has been developed using digital driving methodology. In this paper, we discuss the development of diver IC which is applied to Digital AMOLED module. Technologies for low cost IC structure and image quality enhancement are presented.

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Novel tandem white OLED panel architecture for wide color gamut and viewing angle

  • Lee, Sung-Hun;Kim, Mu-Gyeom;Song, Jung-Bae;Kim, Sang-Yeol;Tamura, Shinichiro;Kang, Sung-Kee;Kim, Jong-Min;Lee, Sung-Soo;Choi, Jun-Ho;Ha, Jae-Kook;Chu, Chang-Woong;Kim, Chi-Woo;Lee, Jin-Seok
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1112-1115
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    • 2008
  • A very high current efficiency of 28 cd/A for three-mode microcavity tandem WOLED was successfully demonstrated. The 101 % of NTSCu'v' ratio of this white OLED with LCD color filter was achieved. In addition to wide color gamut, the highest delta (u'v') of respective RGB colors among the viewing angles 0 and 60 degree is just 0.042 and that of white color is less than 0.02.

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1.5' Full Color ECR(Enhanced Contrast Ratio) OLED Using Black Layer Technology

  • Kang, Seong-Jong;E, Jung-Yoon;Roh, Byeong-Gyu;Lee, Jong-Ho;Kim, Woo-Young
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1394-1397
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    • 2005
  • Hyundai LCD Inc. and LUXELL Technologies Inc. have jointly developed a 1.5" passive matrix full color OLED display ($132{\times}RGB{\times}96$, 111ppi) with characteristics of enhanced contrast ratio using black layer technology. This prototype ECR OLED was fabricated with the structure of ITO/HIL/HTL/RGB EML/HBL/ETL/LiF/Black Layer/Cathode and showed significant improvement of contrast ratio comparing with that of non-filtered OLED as well as compatible with circular polarizer OLED

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Highly stable Zn-In-Sn-O TFTs for the Application of AM-OLED Display

  • Ryu, Min-Ki;KoPark, Sang-Hee;Yang, Shin-Hyuk;Cheong, Woo-Seok;Byun, Chun-Won;Chung, Sung-Mook;Kwon, Oh-Sang;Park, Eun-Suk;Jeong, Jae-Kyeong;Cho, Kyoung-Ik;Cho, Doo-Hee;Lee, Jeong-Ik;Hwang, Chi-Sun
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.330-332
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    • 2009
  • Highly stable bottom gate thin film transistors(TFTs) with a zinc indium tin oxide(Zn-In-Sn-O:ZITO) channel layer have been fabricated by rf-magnetron co-sputtering using a indium tin oxide(ITO:90/10), a tin oxide and a zinc oxide targets. The ZITO TFT (W/L=$40{\mu}m/20{\mu}m$) has a mobility of 24.6 $cm^2$/V.s, a subthreshold swing of 0.12V/dec., a turn-on voltage of -0.4V and an on/off ratio of >$10^9$. When gate field of $1.8{\times}10^5$ V/cm was applied with source-drain current of $3{\mu}A$ at $60^{\circ}C$, the threshold voltage shift was ~0.18 V after 135 hours. We fabricated AM-OLED driven by highly stable bottom gate Zn-In-Sn-O TFT array.

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PM OLED Fabrication with New Method of Metal Cathode Deposition Using Shadow Mask

  • Lee, Ho-Chul;Kang, Seong-Jong;Yi, Jung-Yoon;Kim, Ho-Eoun;Kwon, Oh-June;Hwang, Jo-Il;Kim, Jeong-Moon;Roh, Byeong-Gyu;Kim, Woo-Young
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.987-989
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    • 2006
  • 1.52" $130(RGB){\times}130$ full color PM OLED device with $70\;{\mu}m{\times}210\;{\mu}m$ of sub-pixel pitch was fabricated using shadow mask method for metal cathode deposition. Instead of conventional patterning process to form cathode separator via photolithography, regularly patterned shadow mask was applied to deposit metal cathode in this OLED display. Metal cathode was patterned via 2-step evaporation using shadow mask with shape of rectangular stripe and its alignment margin is $2.5\;{\mu}m$. Technical advantages of this method include reduction of process time according to skipping over photolithographic process for cathode separator and minimizing pixel shrinkage caused by PR cathode separator as well as improving lifetime of OLED device.

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Image Sticking Evaluation Methods for OLED TV Applications

  • Lee, Hun-Jung;Choi, Dong-Wook;Lee, Eun-Jung;Kim, Su-Young;Shin, Mi-Ok;Yang, Sun-A;Lee, Seung-Bae;Lee, Han-Yong;Berkeley, Brian H.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1077-1080
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    • 2009
  • In this paper, we propose a new method for measuring image sticking of an OLED display using a human visual test. We determined that the perceptual image sticking threshold is 2% of luminance difference at 200 nits and 1% at 100 nits, respectively. Color shift must also be considered when evaluating image sticking, as a ${\Delta}$(u', v') shift of just over 0.002 can be recognized regardless of background brightness. Perception of image sticking is affected by the background level, test pattern, and ambient illumination conditions. The evaluation standard must consider both luminance variation and color shift simultaneously.

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Enhancing Lifetime of White OLED Device by Minimizing Operating Voltage Increase

  • Lee, Sung-Soo;Choi, Jun-Ho;Ha, Jae-Kook;Lee, Sang-Pil;Kim, Seong-Min;Choi, Ji-Hye;Lee, Soo-Yeon;Kim, Hyo-Seok;Chu, Chang-Woong;Shin, Sung-Tae;Kim, Chi-Woo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1658-1660
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    • 2007
  • We fabricate green device having unique life time characteristics of operating voltage reduction with time, ${\Delta}V_{op}$ <0. A green device needs lower voltage than initial voltage for sustaining constant current as life time goes on. It means there are two possible reasons; one is interface modification between anode and HIL due to oxygen plasma treatment and the other is bulk property modification due to combination of new green host and new green dopant. From these materials and oxygen plasma treatment, we can make white OLED device having the characteristics of low ${\Delta}V_{op}$ increasing.

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Current Status of International Standardization for OLED Lighiting (OLED 조명의 국내외 표준화 현황)

  • Cho, D.H.;Lee, J.I.;Chu, H.Y.
    • Electronics and Telecommunications Trends
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    • v.27 no.1
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    • pp.113-121
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    • 2012
  • OLED는 두 개의 전극 사이에 유기물층을 배열하고 전계를 가하여 주입된 전자와 정공이 유기물 내에서 재결합하여 형성되는 여기자가 기저상태로 떨어지면서 빛을 내는 소자이다. 최근 OSRAM, Philips, LG화학, Panasonic 등의 기업에서 매우 우수한 특성을 보이는 OLED 패널 광원을 발표하고 있어 가까운 장래에 예전에 볼 수 없던 디자인의 OLED 조명이 일반조명 시장에 나올 것으로 예상됨에 따라 표준화 활동도 활발해지고 있다. OLED 조명은 기존 조명과 형태 및 특성이 다르기 때문에 기존 조명의 규격 사항을 그대로 적용할 수 없으며, 새로운 OLED 조명 표준 제정은 필수이다. 또한 국제표준화기구의 인증 마크의 유무는 자사 제품의 우수성과 안전성을 홍보하는 수단이고 해외로 진출하기 위해서는 해외의 주요 인증 획득이 필수적인 요소이므로 올바른 OLED 조명 표준 제정과 시험 방법 정립을 통하여 OLED 조명 제품의 국내외 신뢰를 확보하는 데 노력해야 할 것이다.

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Large-Sized AMOLED for TV Application

  • Chu, Chang-Woong;Chung, Jin-Koo;Lee, Dong-Won;Ha, Jae-Kook;Choi, Jun-Ho;Lee, Sung-Soo;Lee, Joo-Hyeon;Lee, Sang-Pil;Shin, Sung-Tae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.39-42
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    • 2007
  • Since the scalability of OLED process is crucial factor for large-sized TV manufacturing, various technologies are reviewed based on the published information. Despite of recent technology advancement enabling high color purity, large-sized AMOLED, a lot of problems to solve still exist to enter the large-sized display market. Here, Samsung will discuss what has to be concerned for large panel and how far the OLED technologies need to go more for the large-sized AMOLED TV marketplace.

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Compensation of OLED Degradation by AMOLED Pixel Circuit

  • Choi, Sang-Moo;Goo, Bon-Seok;Kang, Jin-Goo;Kim, Keum-Nam;Kim, Yang-Wan;Choi, Woong-Sik;Kim, Byung-Hee
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.466-469
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    • 2009
  • The life time of AMOLED displays has been dependent on OLED materials up to this point. In particular, image sticking (burn-in) has been one of the most critical issues for AMOLEDs. This paper proposes image sticking compensation AMOLED pixel circuits to address the problem without requiring process or material improvements to the OLED itself. We verified the performance of those circuits by simulation and actual panel implementation.

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