• Title, Summary, Keyword: LCD

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Analysis of Thermal Distribution inside LCD Monitor by Development of Prediction Formula for Inner Temperature (내부 온도 추정식 개발에 의한 LCD 모니터 내부의 열분포 분석)

  • Oh, S.J.;Ko, H.S.;Chung, D.H.
    • 유체기계공업학회:학술대회논문집
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    • pp.487-488
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    • 2006
  • In these days, demand of a LCD monitor is remarkably increasing with development of the LCD technology. However, there are thermal problems for improvement of efficiency for the LCD monitor. Thus, this research analyzed thermal problems such as convection and conduction heat transfer characteristics in the LCD monitor using an infrared (IR) camera. Also, the results of the outer side of the front LCD panel using the IR camera have been compared with the results of the inner side of the front panel using T-type thermocouples. The equations have been derived for the temperature distribution of the inner side of the front LCD panel by a multiple regression method including variables for ambient temperature, humidity and temperature differences between the front and back panels of the LCD monitor.

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2.8 inch QVGA System On Panel LCD Employing Advanced CMOS LTPS Technology

  • Yoon, Ji-Mo;Yoo, Juhn-S.;Yu, J.S.;Kim, E.;Son, C.Y.;Park, J.K.;Yoo, Y.S.;Lim, K.M.;Kim, C.D.;Chung, I.J.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.285-288
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    • 2005
  • A 2.8 inch fully integrated SOP employing a high performance LTPS CMOS TFT technology has been developed for mobile display applications. The LCD module is directly interfaced with 3V 6-bit RGB source via timing control circuitry. The integrated data driver comprises a 6-bit hybrid type DAC with low power analog buffer.

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Integrated Gate Driver Circuit Using a-Si TFT with AC-Driven Dual Pull-down Structure

  • Jang, Yong-Ho;Yoon, Soo-Young;Kim, Binn;Chun, Min-Doo;Cho, Hyung-Nyuck;Cho, Nam-Wook;Sohn, Choong-Yong;Jo, Sung-Hak;Choi, Seung-Chan;Kim, Chang-Dong;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.944-947
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    • 2005
  • Highly stable gate driver circuit using a-Si TFT has been developed. The circuit has dual-pull down structure, in which bias stress to the TFTs is relieved by alternating applied voltage. The circuit has been successfully integrated in 4-in. QVGA and 14-in. XGA TFT-LCD with a normal a-Si process, which are stable for over 2,000 hours at $60^{\circ}C$. The enhancement of stability of the circuit is attributed to retarded degradation of pull-down TFTs by AC driving.

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The World's Largest 100inch TFT-LCD for HDTV and Public Display Application

  • Kang, I.B.;Jin, H.C.;Lee, S.H.;Jang, E.S.;Moon, H.M.;Oh, C.H.;Yeo, S.D.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.281-285
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    • 2006
  • Recently LG.Philips LCD (hereafter "LPL") has announced the development of the world's largest 100-inch TFT-LCD with Advanced Super IPS technology. This magnificent LCD achieves the feature of a full high definition resolution $1920{\times}1080(16:9)$, 600nit brightness, 3000:1 dynamic contrast ratio, 92% color gamut, 180 degree viewing angle, and 5msec response time at all grays, targeted for HDTV and public display applications. Some unique technologies such as Cu bus line, advanced wide view polarizer, and high color gamut lamp were applied. A new stitching free technology was developed to overcome the size limitation of photo mask in both the TFT and CF processes. The size of the panel (100-inch) based on the wide format (16:9) is determined by the maximum efficiency of world's $1^{st}$ seventh generation line (glass size:$1950{\times}2250mm$) in LPL's Paju display cluster. In this paper, we will discuss the issues of 100-inch TFT-LCD.

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The Perception Limit of LCD TV's Motion-Blur Levels Based on Human Visual System at Moving Pictures

  • Shin, Kwang-Hoon;Ahn, Ji-Young;Kim, Ki-Duk;Shin, Hyun-Ho;Chung, In-Jae
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1306-1310
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    • 2006
  • We conducted visual perception experiments to determine the perception limits of motion blur based on human visual system at LCD TV's moving pictures. The motion blur can be expressed Blurred Edge Width (BEW). The results showed that the BEW of moving pictures should be below 3.4pixels (visual angle 4.2') at 3H distance in a living room environment.

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Oxide Semiconductor TFTs for the Next Generation LCD-TV Applications

  • Lee, Je-Hun;Kim, Do-Hyun;Yang, Dong-Ju;Hong, Sun-Young;Yoon, Kap-Soo;Hong, Pil-Soon;Jeong, Chang-Oh;Lee, Woo-Geun;Song, Jin-Ho;Kim, Shi-Yul;Kim, Sang-Soo;Son, Kyoung-Seok;Kim, Tae-Sang;Kwon, Jang-Yeon;Lee, Sang-Yoon
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1203-1207
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    • 2008
  • For a large sized, ultra definition (UD) and high refresh rate for motion blur free AMLCD TVs, amorphous IGZO thin film transistor (TFT) are applied and investigated in terms of threshold voltage ($V_{th}$) shift influenced by active layer thickness uniformity, source drain etching technology, heat treatment and passivation condition. Optimizing above parameters, we fabricated the world's largest 15 inch XGA AMLCD successfully.

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Detection of TFT-LCD Defects Using Independent Component Analysis (독립성분분석을 이용한 TFT-LCD불량의 검출)

  • Park, No-Kap;Lee, Won-Hee;Yoo, Suk-In
    • Journal of KIISE:Software and Applications
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    • v.34 no.5
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    • pp.447-454
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    • 2007
  • TFT-LCD(Thin Film transistor liquid crystal display) has become actively used front panel display technology with increasing market. Intrinsically there is region of non uniformity with low contrast that to human eye is perceived as defect. As the gray level difference between the defect and the background is hardly distinguishable, conventional thresholding and edge detection techniques cannot be applied to detect the defect. Between the patterned and un-patterned LCD defects, this paper deals with un-patterned LCD defects by using independent component analysis, adaptive thresholding and skewness. Our method showed strong results even on noised LCD images and worked successfully on the manufacturing line.

A Study of Efficient LCD Brightness Control Technique in the Mobile Embedded System (모바일 제품의 효율적인 LCD 밝기 조절 기법에 관한 연구)

  • Kim, Jong-Dae;Kim, Young-Kil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.1
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    • pp.129-137
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    • 2010
  • There are a lot of multimedia functions getting included in mobile devices recently, not only simple audio but visual functions as well, such as video playing, game and web browsing. Such the visual multimedia functions brought the strong requirement for much bigger LCD Display and high resolution. And the brightness of LCD is also one of major requirements and it is required to be more bright. However, LCD brightness is limited to increase because of power consumption. It occupies nearly 30% of the whole system power. This thesis suggests an effective and simple method of adjusting the LCD backlight brightness, considering a characteristic of battery and user pattern.