• 제목, 요약, 키워드: LCD

검색결과 3,548건 처리시간 0.047초

Development of the advanced transflective LCDs with high optical performance

  • Lee, Jong-Hwae;Park, Ku-Hyun;Kim, Hyun-Ho;Yoon, Jae-Kyung;Park, Ki-Bok;Shin, Hyun-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1330-1332
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    • 2007
  • We have newly developed transflective LCDs with a specific sub-pixel and the single cell gap structure. In our structure, the overall transmittance and reflectance has become higher than typical transflective LCDs. Furthermore, it can simplify the fabrication process of the transflective LCDs.

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A Novel Light Guide Plate with Micro-prisms for an Edge-lit LED Backlight

  • Kwon, Jae-Joong;Kim, Hyoung-Joo;Shim, Sung-Kyu;Baek, Seung-In;Hwang, In-Sun;Jang, Tae-Seok
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1193-1195
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    • 2008
  • We propose a novel light guide plate for an edge-lit LED backlight. Properly designed micro-prisms enable light to go out of the LGP in near vertical direction and luminance fluctuations in front of the LEDs to be invisible.

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The fabrication of TFTs for LCD using the 3mask process

  • Yoo, Soon-Sung;Cho, Heung-Lyul;Kwon, Oh-Nam;Nam, Seung-Hee;Chang, Yoon-Gyoung;Kim, Ki-Yong;Cha, Soo-Yeoul;Ahn, Byung-Chul;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.948-951
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    • 2005
  • New technology that reduces photolithography process steps from 4 to 3 in fabrication of TFT LCD is introduced. The core technology for 3mask-TFTs is the lift-off process [1], by which the PAS and PXL layer are formed simultaneously. To evaluate the stability of this lift-off process, outgases from photo resist on a substrate during ITO deposition and the quality of ITO film were analyzed and the conventional photo resist stripper machine which operates lift-off process was examined to see its ability to reduce particle problems of the machine. Through the development of total process and design for TFTs using this 3mask technology, panels in TN and IPS modes which exhibit same performances of a display using a conventional process were achieved. In addition, this process was already verified in the mass production line and now some products are being produced by the 3mask technology.

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Novel Driving Scheme to remove residual image sticking in AMOLED

  • Parikh, Kunjal;Choi, Joon-Hoo;Cho, Kyu-Sik;Huh, Jong-Moo;Park, Kyong-Tae;Jeong, Byoung-Seong;Park, Yong-Hwan;Kim, Tae-Youn;Lee, Baek-Woon;Kim, Chi-Woo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.553-556
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    • 2008
  • We hereby report novel driving scheme to eliminate effect of "residual" image sticking (RRI) problem which arises due to hysteresis problem in Thin Film Transistor (TFT) in AMOLED Displays. The driving scheme applies "black" voltage after every data voltage period in order to drive AMOLED in uni-direction. The system can be easily implemented with 120 Hz driving scheme which is well matured in AMLCD industries. Our analyses show systematic evaluation of the problem and thereby solving it by simple methods which will be significantly effective of driving OLED towards mass manufacturing stage.

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Electro-mechanical Analyses of Thin Film Transistors for Flexible Displays

  • Saran, Neerja;Roh, Nam-Seok;Kim, Sang-Il;Lee, Woo-Jae;Kim, Jong-Seong;Hwang, Tae-Hyung;Hong, Seok-Joon;Kim, Myeong-Hee;Lim, Soon-Kwon;Souk, Jun-Hyung
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.670-673
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    • 2008
  • Good mechanical properties of thin-film transistors on plastic substrates are an essential parameter in the development of robust flexible displays. In this paper, a careful investigation is carried out on TFT backplane on plastic substrates under cyclic bending conditions. Bending modes of tensile and compressive as well as parallel and perpendicular orientation-dependent bending of channel have been analyzed carefully. This analysis will be helpful in knowing the electro-mechanical performance boundaries of the TFT devices so as to determine the bending limitations of our flexible displays.

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a-Si TFT Integrated Gate Driver Using Multi-thread Driving

  • Jang, Yong-Ho;Yoon, Soo-Young;Park, Kwon-Shik;Kim, Hae-Yeol;Kim, Binn;Chun, Min-Doo;Cho, Hyung-Nyuck;Choi, Seung-Chan;Moon, Tae-Woong;Ryoo, Chang-Il;Cho, Nam-Wook;Jo, Sung-Hak;Kim, Chang-Dong;Chung, In-Jae
    • Journal of Information Display
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    • v.7 no.3
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    • pp.5-8
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    • 2006
  • A novel a-Si TFT integrated gate driver circuit using multi-thread driving has been developed. The circuit consists of two independent shift registers alternating between the two modes, "wake" and "sleep". The degradation of the circuit is retarded because the bias stress is removed during the sleep mode. It has been successfully integrated in 14.1-in. XGA LCD Panel, showing enhanced stability.

Novel AC bias compensation scheme in hydrogenated amorphous silicon TFT for AMOLED Displays

  • Parikh, Kunjal;Chung, Kyu-Ha;Choi, Beom-Rak;Goh, Joon-Chul;Huh, Jong-Moo;Song, Young-Rok;Kim, Nam-Deog;Choi, Joon-Hoo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1701-1703
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    • 2006
  • Here we describe a novel driving scheme in the form of negative AC bias stress (NAC) to compensate shift in the threshold voltage for hydrogenated amorphous silicon (${\alpha}$-Si:H) thin film transistor (TFT) for AMOLED applications. This scheme preserves the threshold voltage shift of ${\alpha}$-Si:H TFT for infinitely long duration of time(>30,000 hours) and thereby overall performance, without using any additional TFTs for compensation. We briefly describe about the possible driving schemes in order to implement for real time AMOLED applications. We attribute most of the results based on concept of plugging holes and electrons across the interface of the gate insulator in a controlled manner.

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LVDS를 이용한 daisy-chain 방식의 다중 LCD 시스템 개발 (Multiple LCD System Development of daisy-chain Method using LVDS)

  • 김재철
    • 한국정보통신학회논문지
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    • v.16 no.12
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    • pp.2747-2754
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    • 2012
  • 본 논문에서 PC 컨텐츠의 활용을 극대화시키는 부가기능을 갖는 다중 LCD(Liquid Crystal Display) 시스템을 개발하였다. 이는 host LCD와 slave LCD로 구성되어 있다. Host LCD는 NTSC(National Television System Committee), PAL(Phase Alternation Line), SECAM(S$\acute{e}$quentiel couleur avec m$\acute{e}$moire) 신호를 받아 영상 및 음성을 데코딩하여 출력한다. 이 데코딩된 신호들을 LVDS(Low Voltage Differential Signaling) 신호로 변환하여 slave LCD단으로 전송을 하는 기능을 갖는다. 그리고 CF 메모리, USB 메모리등을 장착하여 멀티미디어 데이터를 출력하도록 한다. Slave LCD는 host LCD와 달리 튜너부분이 없고 메모리 장착이 되지 않아 자체 TV 신호 수신 및 영상 신호 재생을 하지 못한다. 다만, LVDS 영상 신호를 받아 LCD 팬널에 출력하는 기능만 갖도록 한다. 본 논문에서 개발한 다중 LCD 시스템은 제품이 단순하여 상대적으로 고장률이 낮고, 가격이 저렴하고 제어부분의 간소화로 디스플레이의 전력이 낮으며, host LCD의 채널, 볼륨 및 영상 출력에 대하여 전체 slave LCD를 제어할 수 있는 제품으로서의 가격 및 기능 경쟁력을 갖추고 있다.

LCD 패널의 불량을 검출하는 검사용 LED BLU 개발 (Development of a LED BLU Tester Detecting the Errors of LCD Panels)

  • 고훈준;장경수;오주영
    • 한국콘텐츠학회논문지
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    • v.10 no.5
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    • pp.62-69
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    • 2010
  • LCD 패널은 자체적으로 발광할 수 없어 외부 광원인 BLU가 필요하다. BLU는 LCD 모듈에 포함되어 사용되고 LCD 패널의 불량을 검사하는 테스터에서도 사용된다. 최근에는 BLU가 CCFL에서 LED로 빠르게 변화되고 증가해왔다. CCFL은 초고압 전원이 필요하고, 열도 많이 발생하며, 일정한 휘도를 유지하기가 어렵다. LED는 전력소모량이 적고, 일정한 휘도를 유지한다. 그러나 현재 테스터에서 사용되는 BLU는 CCFL을 사용하고 있다. 본 연구에서는 LCD 패널의 불량을 검사할 수 있는 검사용 LED BLU를 개발한다. 또한 12~24인치의 LCD 패널을 모두 검사할 수 있도록 LED BLU를 24인치 크기로 제작하고 LCD패널의 크기에 따라 LED BLU가 동작하도록 개발한다.

The acceptable limit of the contrast ratio of LCD TV based on human visual system

  • Shin, Kwang-Hoon;Moon, Jong-Won;Park, Sun-Ah;Ahn, Ji-Young;Kang, Dong-Woo;Shin, Hyun-Ho
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1497-1499
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    • 2007
  • Visual perception experiments were conducted to determine the acceptable limit of the contrast ratio of LCD TV under the watching condition. The results showed that the corresponding contrast ratio should be below 10,000:1 at the 3H(height of screen) distance in the living room environment.

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