• Title/Summary/Keyword: OLED

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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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Evaluation of Carbonation Characteristic for Concrete using OLED Waste Glass Powder (OLED 페유리 미분말을 혼화재로 활용한 콘크리트의 탄산화 특성 평가)

  • Kim, Jae-Don;Jang, Il-Young
    • Journal of the Korean Society of Industry Convergence
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    • v.23 no.6_2
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    • pp.1111-1117
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    • 2020
  • In this study, the carbonation characteristics of concrete according to the mixture of OLED waste glass were evaluated. Replacement capacities of OLED waste glass were 0%, 10%, 20%, and 30% of cement, and they were named OG 0, OG 10, OG 20, and OG 30. As a result of the compressive strength test, OG 0 without replacing OLED waste glass showed high intensity until the 14th. However, the higher the replacement rate of OLED waste glass, the higher the compressive strength of 28 days. In addition, the speed of carbonation was faster with the higher the replacement rate of OLED waste glass, and the accelerated carbonation experiment was about three times faster than the natural carbonation test. In conclusion, the carbonation characteristics of OLED concrete are expected to be positive in terms of atmospheric CO2 absorption.

Comparative Investigation on the Light Emitting Characteristics of OLED Devices with a Single Layer of Alq3 and a Double Layer of Rubrene/Alq3

  • Jeong, Geon-Su;Lee, Bung-Ju;Kim, Hui-Seong;;Sin, Baek-Gyun
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.246.2-246.2
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    • 2014
  • Green-light emitting OLED with single layer of Alq3 and orange-light emitting OLED with double layer of rubrene/Alq3 as EML were fabricated and characterized comparatively. The two OLED devices were based on an anode of ITO, HTL of TPD, and cathode of Al, respectively. The green light emitting OLED was then prepared with Alq3 as both ETL and EML, while the orange-light emitting OLED was prepared with rubrene deposited on Alq3. All the component layers of the OLED devices were deposited by a thermal evaporation technique in vacuum. Photoluminescence characteristics of the EML layers were investigated. Electrolumiscence characteristics of the OLED devices were comparatively investigated.

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Frequency Response Characteristics of Fluorescent OLED with Alternating Current Driving Method (교류구동방식에 의한 형광 OLED의 주파수 응답 특성)

  • Seo, Jung-Hyun;Ju, Sung-Hoo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.32 no.1
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    • pp.40-46
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    • 2019
  • To study the frequency response characteristics of alternating-current-driven organic light-emitting diodes (OLEDs), we fabricated blue-fluorescent OLEDs and analyzed their electroluminescent characteristics according to the alternating current voltage and frequency. The luminance-frequency characteristics of alternating-current-driven OLED was similar to that of a low-pass filter, and the luminance of high-voltage OLED decreased at higher frequency than low-voltage OLED. The luminance characteristics of the OLED according to the frequency is due to the capacitive reactance in the OLED, generated during the alternating current driving. The frequency response characteristics of the OLED according to the voltage is due to the decrease in internal resistance of the organic layer. In addition, the negative voltage component of the alternating current did not affect the frequency response of the OLED. Therefore, the electroluminescent characteristics of OLED with an alternating current power of 60 Hz are not influenced by the frequency.

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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Electroluminescent Characteristics of Fluorescent OLED with Alternating Current Forward Bias (교류 순방향 바이어스에 따른 형광 OLED의 전계 발광 특성)

  • Seo, Jung-Hyun;Ju, Sung-Hoo
    • Journal of the Korean institute of surface engineering
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    • v.50 no.5
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    • pp.398-404
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    • 2017
  • In order to study the AC driving mechanism for OLED lighting, the fluorescent OLEDs were fabricated and the electroluminescent characteristics of the OLEDs by AC forward bias were analyzed. In the case of the driving method of OLED by AC forward bias under the same voltage and the same current density, degradation of luminescent characteristics for elapsed time progressed faster than in the case of the driving method by DC bias. These phenomena were caused by the peak voltage of AC forward bias which is ${\sqrt{2}}$ times higher than the DC voltage. In addition, the degradation of the OLED was accelerated because the AC forward bias had come close to the upper limit of the allowable voltage range even though the peak voltage didn't exceed the allowable range of the OLED. However, the fabricated fluorescent OLED showed little degradation of OLED characteristics due to AC forward bias from 0 V to 6.04 V. Therefore, OLED lighting by AC driving will become commercialized if sufficient luminance is realized at a voltage at which the characteristics of the OLED are not degradation by the AC driving method.

5-TFT OLED Pixel Circuit Compensating Threshold Voltage Variation of p-channel Poly-Si TFTs (p-채널 다결정 실리콘 박막 트랜지스터의 문턱전압 변동을 보상할 수 있는 5-TFT OLED 화소회로)

  • Chung, Hoon-Ju
    • The Journal of the Korea institute of electronic communication sciences
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    • v.9 no.3
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    • pp.279-284
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    • 2014
  • This paper proposes a novel OLED pixel circuit to compensate the threshold voltage variation of p-channel low temperature polycrystalline silicon thin-film transistors (LTPS TFTs). The proposed 5-TFT OLED pixel circuit consists of 4 switching TFTs, 1 OLED driving TFT and 1 capacitor. One frame of the proposed pixel circuit is divided into initialization period, threshold voltage sensing and data programming period, data holding period and emission period. SmartSpice simulation results show that the maximum error rate of OLED current is -4.06% when the threshold voltage of driving TFT varies by ${\pm}0.25V$ and that of OLED current is 9.74% when the threshold voltage of driving TFT varies by ${\pm}0.50V$. Thus, the proposed 5T1C pixel circuit can realize uniform OLED current with high immunity to the threshold voltage variation of p-channel poly-Si TFT.

The Detection of Promising R&D Fields m OLED Illumination Industry (OLED 조명산업 내 R&D 유망 분야 발굴)

  • Sim, Jin-Bo;Kim, You-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.11B
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    • pp.1403-1412
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    • 2011
  • This study performed a detecting research of promising R&D field utilizing intuitive methodology regarding OLED illumination industry. For this, 69 professionals of the illumination industry in Korea were composed as a panel to hold an in-depth interview and survey for 1 month. The study classified the OLED illumination industry as 4 fields of panel, material/component for panel, manufacturing equipment, and lighting system, and selected core technology for each field, and divided it into a total of 14 possible fields for R&D. As a result of evaluating the technological competitive power for each field, the field in Korea which received the highest technological competitive power was OLED panel, and contrarily, technological competitive power of material/component for OLED panel showed the lowest, which requires improvement Meanwhile, evaluating economical aspect, conformity to policy, and effectiveness of R&D in general, 7 promising R&D fields were selected. The 4 core technologies of OLED panel, which are, white, transparent, color change and flexible OLED manufacturing technology were evaluated as the most promising fields, and next, organic material for surface light source, material/component for substrate and equipment for forming large sized substrate were evaluated as promising fields.

Improved Method for Angle-of-View Measurement of Display Devices

  • Lee, Eun-Jung;Chong, Jong-Ho;Yang, Sun-A;Lee, Hun-Jung;Shin, Mi-Ok;Kim, Su-Young;Choi, Dong-Wook;Lee, Seung-Bae;Lee, Han-Yong;Berkeley, Brian H.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.979-982
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    • 2009
  • With increasing demand for better FPD image quality, better evaluation metrics and advanced display quality measurement methods are required to meet these needs. There are many measurement methods to evaluate viewing angle of the various different display devices. However, these methods, which include luminance drop, color shift, and contrast ratio decrease, are imperfect considering that human perception does not completely correlate to these methods. In this paper, we propose a new method for measuring perceptual angle of FPDs considering human visual perception, which uses color space of the color appearance model.

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Implementation of a Mouse with an OLED display for a Customized Advertisement Based on the Internet (인터넷 기반 수요자 맞춤형 광고를 위한 OLED 디스플레이 장착 마우스의 구현)

  • Lee, Sun-Hwan;Lee, Hyuek-Jae
    • Journal of the Institute of Convergence Signal Processing
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    • v.12 no.1
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    • pp.50-55
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    • 2011
  • In this paper, we propose and demonstrate an effective video advertising method for on-line shopping malls. For the Internet advertising, we make a mouse with a small OLED display that can communicate with PC's Internet network. Without displaying the teasing Pop-ups on the PC's monitor, the advertising for a shopping mall is directly sent to the OLED display on the mouse. Also, the proposed method has merits of sending the advertising based on customer's preference by using IP multicasting, which the customer can select an advertising category in advance. When the customer want to buy an item on the OLED display, the detail advertising can be immediately accessed through a Web browser on PC's monitor by pushing a special button on the mouse.