• Title/Summary/Keyword: LCD

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Development of OCB mode with impulsive driving scheme for improving moving picture quality

  • Kim, J.L.;Lee, C.H.;Park, S.Y.;Yoo, S.W.;Oh, J.H.;Lee, S.H.;Chai, C.C.;Park, C.W.;Ban, B.S.;Ahn, S.H.;Hong, M.P.;Chung, K.H.;Lim, S.K.;Kim, K.H.;Souk, J.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1049-1052
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    • 2004
  • In general, contrary to the CRTs with impulsive emission, liquid crystal displays have motion artifacts such as blurring. ghost image, decrease of dynamic CR(contrast ratio), and stroboscopic motion due to hold type driving method. In this paper, to improve motion picture quality of LCDs. impulsive driving method of black data insertion was applied to the OCB mode which is well known for its fast LC response time and wide viewing angle properties. Subject evaluation was carried out with CRT, TN, SIPS(Super IPS). and impulsive driving OCB. Moving picture image quality near CRT was obtained in impulsive OCB driving mode

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An Internal Touch Screen Panel Using Standard a-Si:H TFT LCD process

  • You, Bong-Hyun;Lee, Byoung-Jun;Lee, Ki-Chan;Han, Sang-Youn;Koh, Jai-Hyun;Takahashi, Seiki;Berkeley, Brian H.;Kim, Nam-Deog;Kim, Sang-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.250-253
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    • 2008
  • A touch screen panel embedded 12.1-inch TFT LCD employing a standard a-Si:H TFT process has been successfully developed. Compared with conventional external touch screen panels, the new internal TSP exhibits a clearer image and improved touch feeling. Our new internal proposed TSP can be fabricated with low cost.

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A Novel Pixel structure suitable for color scanner embedded TFT-LCD

  • Choo, Kyo-Seop;Kang, Hee-Kwang;Yu, Jun-Hyeok;Do, Mi-Young;Choo, Kyo-Hyuck;Lee, Deuk-Su;Kang, In-Byeong;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1327-1329
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    • 2007
  • We developed a 4 inch (qVGA, 320x240) a-Si TFT LCD which has the function of color scanner. We have designed the novel pixel structure and got good scanning quality with minimum aperture loss. In this new pixel, the sensor capacitance was increased in double without decreasing the aperture loss.

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Backlight for Large-area LCD-TVs using Light Emitting Diodes

  • Choi, Jong-Hyun;Chu, Haang-Rhym;Bang, Ju-Young;Park, Hee-Jeong;Hong, Hee-Jung;Lim, Moo-Jong;Oh, Eui-Yeol;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1153-1156
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    • 2005
  • A backlight for large-area LCD (Liquid Crystal Display)-TVs has been developed using Light Emitting Diodes (LEDs). Performances of the backlight and the methods driving the LEDs are introduced in this research. A spectral relationship between the LEDs and the color filters of a panel were investigated as well. In order to realize a CRT like dynamic effect, the area-focused luminance control (AFLC) technology was adopted in developing the backlight. Thus, a possibility of applying the LEDs to the backlight for large-area LCD-TVs was systematically proved.

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Area-Focused Luminance Control Backlight for LCD TV applications

  • Hong, Hee-Jung;Kwon, Kyung-Joon;Choi, Jong-Hyun;Lee, Si-Hoon;Hwang, Hak-Mo;Lim, Moo-Jong;Oh, Eui-Yeol;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1157-1160
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    • 2005
  • In order to improve the image quality of a large size LCD-TV, the Area-Focused Luminance Control (AFLC) technology with data processing algorithm has been developed. The AFLC backlight consists of 16 U-shaped lamps, and controllable areas are divided into 8 blocks. Based on the AFLC technology, the backlight luminance of each block is automatically and separately controllable. Consequently, the contrast ratio is greatly enhanced whereas the corresponding power consumption is decreased as compared with those of conventional backlights.

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All Layer Printed TFT-LCD Device by Large Area UV-Imprinting Lithography

  • Chang, Jae-Hyuk;Lee, Seung-Jun;Park, Dae-Jin;Bae, Joo-Han;Lee, Sung-Hee;Kim, Jang-Kyum;Kim, Kyu-Young;Bae, Jung-Mok;Kim, Bo-Sung;Lim, Soon-Kwon
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1115-1117
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    • 2009
  • Resist patterning of all layers in TFT and BM layer in CF were carried out using UV-imprinting Lithography to make a 12.1 inch TFT-LCD panel at the resolution of 1280 ${\times}$ 800 lines (125 ppi). Technical challenges and solutions for resist patterning by UV-imprinting are shown in this article.

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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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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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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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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.