• Title/Summary/Keyword: TFT-LCD

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Comparative Pixel Characteristics of ELA and SMC poly-Si TETs for the Development of Wide-Area/High-Quality TFT-LCD (대화면/고화질 TFT-LCD 개발을 위하여 ELA 및 SMC로 제작된 다결정 실리콘 박막 트랜지스터의 화소 특성 비교)

    • Journal of the Korean Vacuum Society
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    • v.10 no.1
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    • pp.72-80
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    • 2001
  • In this paper, we present a systematic method of extracting the input parameters of poly-Si TFT(Thin-Film Transistor) for Spice simulations. This method has been applied to two different types of poly-Si TFTs such as ELA (Excimer Laser Annealing) and SMC (Silicide Mediated Crystallization) with good fitting results to experimental data. Among the Spice circuit simulators, the PSpice has the GUI(graphic user interface) feature making the composition of complicated circuits easier. We added successfully the poly-Si TFT model of AIM-Spice to the PSpice simulator, and analyzed easily to compare the electrical characteristics of pixels without or with the line RC delay. In the comparative results, the ELA poly-Si TFT is superior to the SMC poly-Si TFT in the charging time and the kickback voltage for the TFT-LCD (Thin Film Transistor-Liquid Crystal Display).

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A Systematic Method for SPICE Simulation of Electrical Characteristics of Poly-Si TFT-LCD Pixel (SPICE를 사용한 다결정 실리콘 TFT-LCD 화소의 전기적 특성 시뮬레이션 방법의 체계화)

  • Son, Myung-Sik;Ryu, Jae-Il;Shim, Seong-Yung;Jang, Jin;Yoo Keon-Ho
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.38 no.12
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    • pp.25-35
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    • 2001
  • In order to analyze the electrical characteristics of complicated thin film transistor-liquid crystal display (TFT-LCD) array circuits, it is indispensible to use simulation programs such as PSPICE and AIM-SPICE. In this paper, we present a systematic method of extracting the input parameters of poly-Si TFT for SPICE simulations. This method was applied to two different types of poly-Si TFTs, fabricated by excimer laser annealing and silicide mediated crystallization methods, and yielded good fitting results to experimental data. Among the SPICE simulators, PSPICE has the graphic user interface feature making the composition of complicated circuits easier. We added successfully a poly-Si TFT device model to the PSPICE simulator, and analyzed easily the electrical characteristics of pixels considering the line RC delay. The results of this work would contribute to efficient simulations of poly-Si TFT-LCD arrays.

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Cu as an Electrode Material in TFT-LCD Products

  • Park, C.W.;Cho, W.H.;Kim, K.T.;Choi, H.C.;Oh, C.H.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.661-663
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    • 2003
  • In this paper, production of TFT-LCD adopting Cu electrode, in spite of low resistivity, which was not commercially applied to TFT LCD products because of processibility, reliability problems etc. was mentioned. Based on the test result of etch and strip process of Cu electrode, the TFT device using Cu material shows the same characteristics as the conventional TFT devices. We describe the realization of a 20.1" UXGA model which was firstly applied to Cu electrode.

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Development of Image Quality Register Optimization System for Mobile TFT-LCD Driver IC (모바일 TFT-LCD 구동 집적회로를 위한 화질 레지스터 최적화시스템 개발)

  • Ryu, Jee-Youl;Noh, Seok-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2008.10a
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    • pp.592-595
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    • 2008
  • This paper presents development of automatic image quality register optimization system using mobile TFT-LCD (Thin Film Transistor-Liquid Crystal Display) driver IC and embedded software. It optimizes automatically gamma adjustment and voltage setting registers in mobile TFT-LCD driver IC to improve gamma correction error, adjusting time, flicker noise and contrast ratio. Developed algorithms and embedded software are generally applicable for most of the TFT-LCD modules. The proposed optimization system contains module-under-test (MUT, TFT-LCD module), control program, multimedia display tester for measuring luminance, flicker noise and contrast ratio, and control board for interface between PC and TFT-LCD module. The control board is designed with DSP and FPGA, and it supports various interfaces such as RGB and CPU.

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Defect Cell Extraction for TFT-LCD Auto-Repair System (TFT-LCD 자동 수선시스템에서 결함이 있는 셀을 자동으로 추출하는 방법)

  • Cho, Jae-Soo;Ha, Gwang-Sung;Lee, Jin-Wook;Kim, Dong-Hyun;Jeon, Edward
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.5
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    • pp.432-437
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    • 2008
  • This paper proposes a defect cell extraction algorithm for TFT-LCD auto-repair system. Auto defect search algorithm and automatic defect cell extraction method are very important for TFT-LCD auto repair system. In the previous literature[1], we proposed an automatic visual inspection algorithm of TFT-LCD. Based on the inspected information(defect size and defect axis, if defect exists) by the automatic search algorithm, defect cells should be extracted from the input image for the auto repair system. For automatic extraction of defect cells, we used a novel block matching algorithm and a simple filtering process in order to find a given reference point in the LCD cell. The proposed defect cell extraction algorithm can be used in all kinds of TFT-LCD devices by changing a stored template which includes a given reference point. Various experimental results show the effectiveness of the proposed method.

LTPS TFT LCD Status, Outlook and Challenges

  • Young, Ross;Annis, Charles;Kato, Mitsuhiro;Matsuno, Sam;Young, Barry
    • 한국정보디스플레이학회:학술대회논문집
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    • 2003.07a
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    • pp.39-42
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    • 2003
  • Low temperature polysilicon (LTPS) TFT LCOs are in production today at sizes ranging from 0.33" for Viewfinders to 17" for LCD TVs with 21.3" recently demonstrated. Because of their form factor, resolution, brightness and other benefits, LTPS TFT LCD unit shipments, revenues and capacity are expected to grow rapidly, particularly for mobile applications. However, despite the strong outlook, LTPS TFT LCOs are still faced with numerous challenges from a market and technology perspective. LTPS TFT LCD producers were surveyed on which of the current challenges were the most problematic among other questions.

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A Study of Master Production Scheduling Scheme in TFT-LCD Factory considering Line Balancing (TFT-LCD 공장의 라인 밸런싱을 고려한 MPS 수립에 관한 연구)

  • Won, Dae-Il;Baek, Jong-Kwan;Kim, Sung-Shick
    • IE interfaces
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    • v.16 no.4
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    • pp.463-472
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    • 2003
  • In this study we consider the problem of MPS(master production planning) of TFT-LCD(Thin Film Transistor - Liquid Crystal Display) production factory. Due to the complexities of the TFT-LCD production processes, it is difficult to build effective MPS. This study presents an algorithm having a concept of IDPQ(Ideal Daily Production Quantity) that considers line balancing of TFT-LCD production process. In general, the MPS building procedure does not consider line balancing in non-bottleneck processes. MPS without considering line balancing may make ineffective schedule. We present algorithms for building MPS considering factory capacity and line balancing according to the sales order.

Sequential Defect Region Segmentation according to Defect Possibility in TFT-LCD Image (TFT-LCD영상에서 결함 가능성에 따른 순차적 결함영역 분할)

  • Chang, Chung Hwan;Lee, SeungMin;Park, Kil-Houm
    • Journal of Korea Multimedia Society
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    • v.23 no.5
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    • pp.633-640
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    • 2020
  • Defect region segmentation of TFT-LCD images is performed by combining defect pixels detected by a defect detection method into defect region, or by using morphological operations to segment defect region. Therefore, the result of segmentation of the defect region is highly dependent on the defect detection result. In this paper, we propose a method which segments defect regions sequentially according to the possibility of being included in defect regions in TFT-LCD images. The proposed method repeats the process of detecting a seed using the median value and the median absolute deviation of the image, and segments the defect region using the seeded region growing method. We confirmed the superiority of the proposed method to segment defect regions using pseudo-images and real TFT-LCD images.

Study on Shock Resistance Design of TFT-LCD Module using Explicit Impact Analysis (TFT-LCD 모듈의 충격해석을 통한 내충격설계 연구)

  • Kim, J.G.;Lee, J.K.
    • Journal of Power System Engineering
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    • v.14 no.5
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    • pp.24-29
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    • 2010
  • TFT-LCD module with thin, small and layered structure makes its shock analysis very difficult and complicated. As TFT-LCD becomes more thinner, it is more difficult to assure its required shock resistance. Recently, the drop/impact simulation using the commercial explicit dynamic analysis software such as LS-DYNA3D is actively applied to assess the shock characteristics of TFT-LCD. In this study, the effects of analysis parameters and design modifications in the drop/impact simulation are carefully studied. the reliability of the present analysis results can be assured through the experimental verification.

Driving System Design for Poly-Si TFT LCD of EWS (EWS급 Poly-Si TFT-LCD의 구동 시스템 설계)

  • Heon, Kwon-Byong;Park, Jong-Kwan;Cho, Kyu-Min;Choi, Myoung-Ryeul
    • Proceedings of the KIEE Conference
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    • 1999.07g
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    • pp.3120-3122
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    • 1999
  • In this paper we have designed the signal processing system for driving the Poly-Si TFT LCD of EWS. The signal processing system consist of timing controller, ramp signal generator and video signal processing system. Timing controller includes the top-down inversion. left right inversion, left-right shifting and control signal generator according to multi-source signal. The video signal processing system generates sawtooth-shaped waveform by using PROM and DAC for multi-gray scales and implements gamma correction function for compensating the TFT-LCD nonlinear charcteristic of the TFT-LCD. Finally we have discussed the experiment results and its application according to the designed TFT-LCD driving system.

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