• Title, Summary, Keyword: LCD

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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
    • 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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Novel PVA pixel design for mobile application with excellent off-axis image quality

  • Kim, Jae-Hyun;Kim, Gee-Bum;Choi, Ji-Youn;Jang, Yong-Kyu;Ahn, Seon-Hong;Kim, Kyeong-Hyeon;Kim, Sang-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.295-298
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    • 2008
  • We developed a novel PVA pixel design for mobile application with excellent off-axis image quality and optical performance by introducing Active Level Shift technology and optimizing pixel structure. Our new pixel design enables better off-axis image quality without sacrificing other optical properties compared with a conventional mPVA structure.

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IPS-Mode Dynamic LCD-TV Realization with Low Black Luminance and High Contrast by Adaptive Dynamic Image Control Technology

  • Oh, E.Y.;Baik, S.H.;Sohn, M.H.;Kim, K.D.;Hong, H.J.;Bang, J.Y.;Kwon, K.J.;Kim, M.H.;Jang, H.;Yoon, J.K.;Chung, I.J.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.799-802
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    • 2004
  • In this paper, the active backlight control technology with data processing algorithm was developed in order to improve image quality for IPS-mode LCD-TV applications. The image blinking problem caused by repeatedly abrupt change of the backlight luminance was solved by algorithms-Fba(Flexible Boundary algorithm) and Cfa(Cumulative Feedback algorithm)-and the optimized number and space of backlight dimming steps based on perception. In the IPS-mode 42" TFT-LCD panel, the dynamic contrast ratio can be more than twice the typical level by means of lower block luminance and higher white luminance. Additionally, Power consumption and LCD temperature was decreased.

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Smart LCD using a-Si photo sensor

  • Hong, Sung-Jin;Kim, Jin-Hong;Shin, Kyung-Ju;Chai, Chong-Chul;Choi, Jung-Ye;Park, Cheol-Woo;Suk, Jun-Hyung
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.280-284
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    • 2005
  • Recently, the demands of the high quality LCD display device have increased. We have developed the smart LCD that photo sensor is integrated in. Amorphous silicon TFTs have photo leakage current characteristics when the channel of TFTs are lighted on. This characteristic has applied in our device. We expect that photo sensor integrated LCDs have lots of merits in mobile display device, note PC panel and LCD TV.

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Noble measurement method for color breakup artifact in FPDs

  • Lee, Jong-Seo;Jun, Tae-Jong;Lee, Joo-Young;Han, Jung-Suk;Souk, Jun-H
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.92-97
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    • 2006
  • Motion artifact of Display devices has a huge interest from industries and users recently. Among those artifacts, color break up (CBU) is one of the key degrading characteristic in field sequential type displays. Unfortunately, there are no objective measurement methods for CBU. Here we introduce two different kinds of CBU and its measurement methods. The CBU characteristic of LCD, DLP, and PDP was measured and compared.

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Driving Methods of LCD-TV Using a-Si:H TFT Integrated Gate Drivers

  • Lee, Chang-Soo;Lee, Min-Cheol;Lee, Yong-Soon;Bae, Yu-Han;Kim, Young-Su;Moon, Seung-Hwan;Kim, Nam-Deog;Kim, Sang-Soo
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.280-283
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    • 2008
  • LCD-TV applications were successfully implemented using integrated gate drivers. Integrated gate drivers have been implemented on a HD panel for 60Hz operation and on a FHD panel for 120Hz operation. It is found that the integrated gate driver reduces the flicker of a panel.

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Liquid Chromatography-Solid Phase Extraction-NMR (LC-SPE-NMR) Analysis of Liquid Crystalline Mixtures

  • Park, Gregory Hyung-Jin;Park, Ae-Na;Rho, Kyung-Rae;Shin, Jong-Ho;Kim, Yeong-Jeon;Jo, Sung-Chan;Oh, Weon-Sik
    • Journal of the Korean Magnetic Resonance Society
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    • v.15 no.1
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    • pp.14-24
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    • 2011
  • We have performed Liquid Chromatography-Solid Phase Extraction-NMR (LC-SPE-NMR) analysis for liquid crystalline mixture and elucidated the structures of selected components by NMR spectra. Combining the results of one-dimensional 1H experiments as well as homonuclear and heteronuclear two-dimensional experiments, we could analyze the molecular structure of the liquid crystal singles whose structure had not been interpretable by mass spectrometry alone.

White LED Local Dimming Backlight for Aggressive Power Saving and Artifact Minimizing

  • Yeo, Dong-Min;Kwon, Yong-Hoon;Kang, Eui-Jeong;Park, Se-Ki;Yang, Byung-Choon;Kim, Gi-Cherl;Jang, Tae-Seok
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1156-1159
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    • 2008
  • Local dimming driving has advantages in reducing power consumption and improving contrast ratio(CR). In an LED backlight unit(BLU), many small LED blocks are implemented in 2-dimmensional space, and luminance of the blocks is controlled by a local dimming algorithm. However, such a BLU can induce various recognizable artifacts. A new novel algorithm is proposed for exact block luminance calculation to correct local dimming artifacts. Also we discuss modified low-gray-level dimming to achieve much aggressive power saving in a local dimming BLU system.

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Development of World's Largest 21.3' LTPS LCD using Sequential Lateral Solidification(SLS) Technology

  • Kang, Myung-Koo;Kim, Hyun-Jae;Chung, Jin-Koo;Kim, Dong-Beom;Lee, Su-Kyung;Kim, Cheol-Ho;Chung, Woo-Seok;Hwang, Jang-Won;Joo, Seung-Yong;Meang, Ho-Seok;Song, Seok-Chun;Kim, Chi-Woo;Chung, Kyu-Ha
    • Journal of Information Display
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    • v.4 no.4
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    • pp.4-7
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    • 2003
  • The world largest 21.3" LTPS LCD has been successfully developed using SLS crystallization technology. Integration of gate circuit, transmission gate and level shifter was successfully performed in a large area display. Uniform and high performance of high quality grains of SLS technology make it possible to realize a uniform large size LTPS TFT-LCD with half the number of data driver IC's that is typically used in a-Si LCD. High aperture ratio of 65 % was achieved using an organic inter insulating method which lead to a high brightness of 500 cd/$cm^2$.