• Title, Summary, Keyword: TFT-LCD

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Hardware Design of 240*320 TFT-LCD Controller (240*320 TFT-LCD의 컨트롤러 하드웨어 설계)

  • Sung, Kwang-Ju;Ha, Chang-Soo;Choi, Byeong-Yoon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.167-169
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    • 2010
  • This paper describes hardware design and FPGA verification of TFT-LCD controller used in mobile devices widely. TFT-LCD controller outputs pixel's color information red, green, blue and Hsync, Vsync synchronization signals. We used verilog-hdl to describe TFT-LCD controller and simulated it using modelsim software and verified it's exact operation on Xilinx FPGA. Framebuffer made up Block RAM form in FPGA and TFT-LCD displayed image file.

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A Comparative Study on the Quantitative Analysis of the Flicker Phenomena in the Amorphous-Silicon and Poly-Silicon TFT-LCDs (비정질 및 다결정 실리콘 TFT-LCD에서의 플리커(flicker) 현상 비교 분석 연구)

  • Son, Myung-Sik;Song, Min-Soo;Yoo, Keon-Ho;Jang, Jin
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.40 no.1
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    • pp.20-28
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    • 2003
  • In this paper, we present results of the comparative analysis of the flicker phenomena in the poly-Si TFT-LCD and a-Si:H TFT-LCD arrays for the development and manufacturing of wide-area and high-quality TFT-LCD displays. We used four different types of TFTs; a-Si:H TFT, excimer laser annealed (ELA) poly-Si TFT, silicide mediated crystallization (SMC) poly-Si TFT, and counter-doped lateral body terminal (LBT), poly-Si TFT. We defined the electrical quantity of the flicker so that we could compare the flickers quantitatively for four different 40" UXGA TFT-LCDs. We identify three factors contributing to the flicker, such as charging time, kickback voltage and leakage current, and analyze how much each of three factors give rise to the flincker in the different TFT-LCD arrays. In addition, we suggest and show that, in the case of the poly-Si TFT-LCD arrays, the low-level (minimum) gate voltages should be carefully chosen to minimize the flicker because of their larger leakage currents compared with a-Si TFT-LCD arrays.

TFT-LCD Defect Detection Using Double-Self Quotient Image (이중 SQI를 이용한 TFT-LCD 결함 검출)

  • Park, Woon-Ik;Lee, Kyu-Bong;Kim, Se-Yoon;Park, Kil-Houm
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.6
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    • pp.604-608
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    • 2008
  • The TFT-LCD image allows non-uniform illumination variation and that is one of main difficulties of finding defect region. The SQI (self quotient image) has the HPF (high pass filter) shape and is used to reduce low frequency-lightness component. In this paper, we proposed the TFT-LCD defect-enhancement algorithm using characteristics of the SQI, that is the SQI has low-frequency flattening effect and maintains local variation. The proposed method has superior flattening effect and defect-enhancement effect compared with previous the TFT-LCD image preprocessing.

Development of a 30-in. wide-QXGA+ TFT-LCD for High-Information-Content Displays

  • Choi, H.C.;Hong, S.G.;Lim, B.H.;Lee, S.W.;Yeo, S.D.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.19-22
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    • 2004
  • A 30-inch WQXGA+ TFT-LCD Monitor has been developed based on in-plane switching mode with multi-domain. This product adopts Cu electrode which, in spite of low resistivity, was not applied to TFT LCD products because of productivity and reliability problems etc. This low resistivity material makes it possible to clear the problem caused by line delay in such high resolution TFT-LCDs. As a results of successful adoption of innovative materials and technologies, our world's largest TFT-LCD Monitor has best performance for high information display.

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ASG(Amorphous Silicon TFT Gate driver circuit)Technology for Mobile TFT-LCD Panel

  • Jeon, Jin;Lee, Won-Kyu;Song, Jun-Ho;Kim, Hyung-Guel
    • Journal of Information Display
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    • v.5 no.2
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    • pp.1-5
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    • 2004
  • We developed an a-Si TFT-LCD panel with integrated gate driver circuit using a standard 5-MASK process. To minimize the effect of the a-Si TFT current and LC's capacitance variation with temperature, we developed a new a-Si TFT circuit structure and minimized coupling capacitance by changing vertical architecture above gate driver circuit. Integration of gate driver circuit on glass substrate enables single chip and 3-side free panel structure in a-Si TFT-LCD of QVGA ($240{\times}320$) resolution. And using double ASG structure the dead space of TFT-LCD panel could be further decreased.

An outlook of liquid crystal display technology (액정디스플레이 기술의 발전전망)

  • Jang, Jin
    • Electrical & Electronic Materials
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    • v.9 no.7
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    • pp.745-754
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    • 1996
  • 이글에서는 다음의 내용을 다루었다. 1. LCD의 기능 성능 향상, (1) CRT와 TFT-LCD의 기능, 성능 비교, (2) TFT-LCD의 기능, 성능향상을 위한 과제 2. TFT-LCD의 가격 및 수급현황 3. Poly-Si TFT-LCD전망 4. 투사형 TFT-LCD 5. 반사형 LCD 6. 필림형 LCD 7. 고분자 분산형 액정(PDLC)

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Data Communications and their Applications in the Automated TFT LCD Manufacturing System (TFT LCD 자동생산시스템에서 Data 통신 및 응용)

  • Jo, Min-Ho
    • IE interfaces
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    • v.9 no.3
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    • pp.225-235
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    • 1996
  • The SECS Ⅰ and Ⅱ Protocol has been widely used for the TFT LCD and semiconductor industry. This paper shows how the SECS protocol is implemented for data communications between the Host (CAM) and the TFT LCD equipments. In addition, this study introduces a way to apply the SECS protocol to the manufacturing systems control. It provides better throughput in terms of production and faster control of the automated TFT LCD manufacturing system by way of shortcut and distribution of control and data communications. The SECS protocol is successfully used for the control of the real TFT LCD manufacturing system.

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A Process Control in TFT-LCD Industries (TFT-LCD 산업에서의 공정관리)

  • Jo, Jung-Hyeong;Nam, Ho-Su;Lee, Hyeon-U
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • pp.372-376
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    • 2005
  • TFT-LCD(박막 트랜지스터 액정 디스플레이, Thin Film Transistor - Liquid Crystal Display) 산업은 현재 국가의 기간산업으로서 국제경쟁력을 갖추고 있는 몇 안되는 산업 분야 중 하나이다. 따라서, 본 논문에서는 통계적 공정 관리 및 품질 관리 관점에서 TFT-LCD 공정의 특징과 이에 필요한 요소들을 제안하고자 한다.

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Properties of PHC Piles Using TFT-LCD Waste Glass (TFT-LCD 폐유리 사용 고강도 콘크리트 파일의 특성)

  • Lee, Seung-Heun;Lee, Seung-Tae;Min, Kyung-San;Jeon, Sung-Hwan
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.319-320
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    • 2010
  • This Study aimed to investigate fundamental properties of PHC pile using waste TFT-LCD glass powder. Through the present study, waste TFT-LCD glass powder may be taken into consideration for the application of mineral admixture for PHC pile.

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The Characteristics of P.H.C Pile using Admixture by Waste TFT-LCD Glass Powder (폐 TFT-LCD 유리분말을 혼입한 고강도 콘크리트 파일의 특성)

  • Jeon, Seong-Hwan;Min, Kyung-San;Soh, Yang-Seob
    • Journal of the Korean Ceramic Society
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    • v.47 no.5
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    • pp.419-425
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    • 2010
  • In order to examine the P.H.C pile raw material using glass forming ceramic. The used materials is ordinary portland cement, waste TFT-LCD glass powder and reactive agent(Ca$(OH)_2$). The first experiment is characteristics analysis of the waste TFT-LCD glass powder, For the second experiment is mortar and concrete compressive strength for using of the concrete file raw material for waste TFT-LCD glass powder. The results of experiment showed that the substitution ratio of 10% waste TFT-LCD glass powder and 1% reactive agent(Ca$(OH)_2$) was excellent at a point of view for the physical characteristic. The study's most important finding is that the recycling of waste TFT-LCD glass powder.