• Title, Summary, Keyword: LCD

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

  • Kim, Jae-Chul
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.12
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    • pp.2747-2754
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    • 2012
  • This thesis explains the development of multiple LCD system with the additional function to maximize the utilization of PC contents. The newly developed system is composed of host LCD and slave LCD. Host LCD decodes and outputs the image and voice of NTSC, PAL, SECAM signals. It also converts the decoded signals into LVDS signals before transmitting them to slave LCD stage. In addition, the installation of CF Memory and USB Memory helps display multi-media data. Unlike the host LCD, since not including the tuner and memory part, the slave LCD can't receive TV signals and play video signals. It only has the function to receive LVDS image signals and display on a LCD panel. This newly developed multi-LCD system has competitiveness in various aspects. With its simple structure, the failure rate, price and display power are relatively low due to its simplification of the control part. It has price and functional competitiveness as the product whose host LCD can control the entire slave LCD in terms of channel, volume, and video output.

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

  • Kouh, Hoon-Joon;Jang, Kyung-Soo;Oh, Ju-Young
    • The Journal of the Korea Contents Association
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    • v.10 no.5
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    • pp.62-69
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    • 2010
  • LCD panel need BLU(Back Light Unit) that is outside source of light because can not emit light voluntarily. BLU is used in LCD module and is used in tester that examine LCD panel's badness. Lately, BLU had changed from CCFL(Cold Cathode Fluorescent Lamp) to LED(Light-Emitting Diode) fast. CCFL need extra-high tension power and produce much heat and is difficult to keep fixed brightness. LED is few electric power wastage and keeps fixed brightness. But, BLU that is used to detector that examine the LCD module is using CCFL until recently. This paper develops LED BLU that can examine LCD panel's badness. Also, this manufactures LED BLU to 24 inch size to examine all LCD panels(12~24 inch), and develops so that LED BLU may operate according to LCD panel's size.

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
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1251-1254
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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 mode, "wake" and "sleep". The degradation of the circuit is retarded since the bias stress is removed during the sleep mode. It has been successfully integrated in 14.1-in. XGA LCD Panel, showing enhanced stability.

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