• Title/Summary/Keyword: LCD

Search Result 3,524, Processing Time 0.033 seconds

Development of Driver IC on TFT-based Liquid Crystal Display

  • Pan, Po-Chuan;Koo, Horng-Show
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2005.07a
    • /
    • pp.381-384
    • /
    • 2005
  • Driver IC is one of the key components on the LCD monitor and LCD/TV. The function of the driver IC is to transfer and forward the input signals to LCD panel module. Inside driver IC, there are several operating units which process the input signals and generate the appropriate size and resolution to the LCD panel module. LCD panel module will display these input signals. However, there are some difficulties which driver IC designer, LCD monitor and LCD/TV maker will face. Thus, this article addresses the function and difficulties on driver IC.

  • PDF

Study on Defect Cell Extraction of TFT-LCD Panel (TFT-LCD 결함패턴 추출에 관한 연구)

  • Cho, Jae-Soo;Ha, Gwang-Sung;Lee, Jin-Wook;Kim, Dong-Hyun;Jeon, Edward
    • Proceedings of the KIEE Conference
    • /
    • 2007.10a
    • /
    • pp.151-152
    • /
    • 2007
  • 본 논문은 TFT-LCD 영상에서 결함을 자동검색하여 결함이 있는 LCD 영상의 경우 결함이 있는 LCD 패턴을 정확하게 추출해 내는 방법을 제안하였다. TFT-LCD 영상에서 결함이 있는 LCD 패턴 검색은 세단계로 이루어진다. 1단계는 먼저 입력영상에서 LCD 패턴영상의 특징을 이용하여 각 LCD 패턴의 기준점을 찾는다. 2단계는 1단계에서 찾은 여러 기준점 중에서 필터링과정을 통하여 정확한 한 개의 기준점을 최종 선택한다. 마지막으로 3단계에서는 최종적으로 선택된 기준점을 이용하여 결함정의(결함중심 및 결함사이즈)를 이용하여 결함이 포함되어 있는 LCD 패턴을 추출한다. 제안된 결함패턴 추출 알고리즘의 정확성은 컴퓨터 시뮬레이션을 통하여 그 효용성을 증명하였다.

  • PDF

Structural Analysis of LCD Monitor (LCD 모니터의 구조해석)

  • Lee, Jong-Sun
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.14 no.9
    • /
    • pp.4191-4196
    • /
    • 2013
  • In this paper, structural analysis was made on two cases in order to develop free rotational method and rotational angle in LCD monitor. The configuration of LCD monitor in field was modeled by using 3-D design program CATIA V5 and structural analysis was done to the modeled LCD in order to obtain stress, strain and total deformation by using ANSYS finite element analysis program.

The Optimization of Indium Zinc Oxide Thin Film Process in Color Filter on Array structure

  • Lee, Je-Hun;Kim, Jin-Suek;Jeong, Chang-Oh;Kim, Shi-Yul;Lim, Soon-Kwon;Souk, Jun-Hyung
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 2004.08a
    • /
    • pp.1244-1247
    • /
    • 2004
  • For obtaining the best panel quality of color filter on array(COA) architecture in TFF LCD, we investigated the influence of deposition temperature, $O_2$ flow, thickness on the optical transmittance, wet etching and adhesion properties of IZO deposited onto each color photo resist(red, green, blue). Average transmittance of the pixel single layer in the visible range(between 380 and 780nm) was mainly affected by thickness and showed maximum at 1250 ${\AA}$ while the thickness showing peak transparency in each R, G, B wavelength was different. The relation was calculated by using bi-layer transmission and reflectance model, which corresponded to experimental data very well. The adhesion of IZO deposited on each color PR was found to have enhanced value except red PR case, compared to that of IZO which was deposited on $SiN_x$. Wet etching pattern linearity was decreased as the thickness increased. The thickness of IZO was one of vital factors in order to optimize overall pixel process for fabricating COA structure.

  • PDF

Innovative application of Quality Cost System in LCD Industry (LCD 산업에서 품질코스트시스템의 혁신적 활용 연구)

  • Oh, Sang-Young;Park, Jong-Woon
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.9 no.1
    • /
    • pp.195-201
    • /
    • 2008
  • LCD Enterprises introduce quality management strategy to survive in rapid change of production situation. Especially in LCD industry, competitiveness is more needed ever before in the decrease of investment resulted from frequent business fluctuations and in the appearance of the third competitor. In order to overcome this situation, the quality cost system should be implemented as it is suited to a company, but few companys introduce and apply the quality cost system in LCD industry. Thus, Critical factors for outstanding LCD company to apply successfully quality cost system are studied in this paper. The level of importance of the factors is measured be weighted value analysis and a way to maximize the effect of applying quality cost system in LCD industry is proposed by the order of importance.

Aberration Extraction Algorithm for LCD Defect Detection (대면적 LCD 결함검출을 위한 수차량 추출 알고리즘)

  • Ko, Jung-Hwan;Lee, Jung-Suk;Won, Young-Jin
    • 전자공학회논문지 IE
    • /
    • v.48 no.4
    • /
    • pp.1-6
    • /
    • 2011
  • In this paper we show the LCD simulator for defect inspection using image processing algorithm and neural network. The defect inspection algorithm of the LCD consists of preprocessing, feature extraction and defect classification. Preprocess removes noise from LCD image, using morphology operator and neural network is used for the defect classification. Sample images with scratch, pinhole, and spot from real LCD color filter image are used. From some experiments results, the proposed algorithms show that defect detected and classified in the ratio of 92.3% and 94.5 respectively. Accordingly, in this paper, a possibility of practical implementation of the LCD defect inspection system is finally suggested.

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
    • /
    • 2008.10a
    • /
    • pp.1203-1207
    • /
    • 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.

  • PDF

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
    • /
    • 2006.08a
    • /
    • pp.281-285
    • /
    • 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.

  • PDF

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
    • /
    • 2005.07b
    • /
    • pp.944-947
    • /
    • 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.

  • PDF

Development of Automatic Gamma Control System for mobile LCD Applications (모바일 LCD 응용을 위한 자동 감마 제어 시스템 개발)

  • Ryu, Jee-Youl;Noh, Seok-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2007.10a
    • /
    • pp.754-757
    • /
    • 2007
  • This paper presents automatic LCD gamma control system using gamma curve optimization. It controls automatically gamma adjustment registers in mobile LCD driver IC to reduce average gamma error and adjusting time. The proposed gamma system contains module-under-test (MUT, LCD module), PC installed with program, multimedia display tester for measuring luminance, and control board for interface between PC and LCD module. We have developed a new algorithm using 6-point programmable matching technique with reference gamma curve. Developed algorithm and program are generally applicable for most of the LCD modules.

  • PDF