• 한국정보디스플레이학회:학술대회논문집
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• 2003.07a
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• pp.215-218
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• 2003

We have developed a reflective 3.5" QVGA color TFT-LCD with high reflection within viewing angle. For this, We have introduced new pixel design and asymmetric reflector. Based on these technical concepts, we get a high aperture ratio of 93.5% and much higher reflection up to 64% with a 3.5" prototype panel.

• 한국정보디스플레이학회:학술대회논문집
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• 2009.10a
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• pp.594-596
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• 2009

Amorphous silicon nitride (a-SiNx) passivation film as a passivation layer of TFT-LCDs was deposited by AC-reactive sputtering at low temperature. As a result, the electrical characteristics and reliability of TFT with novel passivation showed the same level as the conventional TFT. Finally, we have developed 47"Full HD IPS TFT-LCDs with sputtered amorphous silicon nitride. It is suitable for low temperature based applications such as OTFT and Flexible display.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.208-210
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• 2008

We have developed a LCD Panel that form storage capacitance for pixels between pixel electrode of bottom glass and common electrode of top glass. This method could make higher transmission and higher production yield than before by removing storage electrode line and capacitance on the bottom glass by simplifying bottom pixel structure.

• Information Display
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• v.2 no.1
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• pp.25-29
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• 2001

TFT-LCD는 그 상업화의 역사가 이제 겨우 10여년으로 일천함에도 불구하고 괄목할만한 시장성장과 더불어 우리 생활에 많은 변화를 야기했고, 그 변화의 정도는 앞으로 더욱 더 심화 될 것으로 예상된다 . 요즘 유행처럼 이야기되어지는 정보화 기술 (IT: Information Technology), 디지털 기술이란 의미도 궁극적으로 따져보면 영상정보의 효율적 전달을 의미하며, 그 정보의 실체를 사람의 눈으로 보는 것은 결국 디스플레이 인 것이다. 여러 가지의 디스플레이 가운데 특히 TFT-LCD는 노트북 컴퓨터를 시발점으로 모니터 등 그 웅용분야를 점차 넓혀 가고 있으며, 디스플레이 산업의 시장을 주도하고 있다. 현재 디스플레이의 가장 큰 부분을 차지하고 있는 TV 시장에 대한 접근도 활발히 하고 있어 그 동안 CRT 를 사용한 TV 시장에도 향후 각 디스플레 이간의 주도권 및 영역 다툼이 더욱 심화 되리라고 예상된다. 본고(本稿)에서는 TFT-LCD를 중심으로 TV 에 응용 되기 위한 기술적 요구 사항과 현재 LCD maker들의 개발 현황 및 향후 전망 등 에 대해 정리해 보고자 한다.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.57-60
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• 2005

We have recently developed new organic TFT technologies such as self-aligned self-assembly (SALSA) process and a high-resolution color active-matrix LCD panel. A new method to realize high-resolution printable organic TFT array to drive active-matrix flat-panel display will be discussed.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2004.05a
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• pp.154-158
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• 2004

Power inductor is usually used in the field of the power circuit of a cellular phone, TFT LCD module etc.. This paper presents the development process of Power Inductor Full Automation Winding/Welding System for TFT LCD. This process, the process algorithm, high precision welding current control, design of welding head, high speed, high precision feeding mechanism, and user interface process control program technologies are included.

• Journal of Korea Multimedia Society
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• v.15 no.2
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• pp.204-214
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• 2012

This paper proposes an image segmentation for a vision-based automated defect inspection system on surface image of TFT-LCD(Thin Film Transistor Liquid Crystal Display) panels. TFT-LCD images have non-uniform brightness, which is hard to finding defective regions. Although there are several methods or proposed algorithms, it is difficult to divide the defect with high reliability because of non-uniform properties in the image. Kamel and Zhao disclosed a method which based on logical stage algorithm for segmentation of graphics and character. This method is a one of the local segmentation method that has a advantage. It is that characters and graphics are well segmented in an image which has non-uniform property. As TFT-LCD panel image has a same property, so this paper proposes new algorithm to segment regions of defects based on Kamel and Zhao's algorithm. Our algorithm has an advantage that there are a few ghost objects around the defects. We had experiments to prove performance in real TFT-LCD panel images, and comparing with the FFT(Fast Fourier Transform) method which is used a bandpass filter.

• Journal of Advanced Marine Engineering and Technology
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• v.41 no.3
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• pp.251-257
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• 2017

In this paper, an algorithm for detecting defects in thin-film-transistor liquid-crystal display (TFT-LCD) cell images is presented. TFT-LCD cell images typically contain periodic cell patterns that make it difficult to detect defects. We propose an efficient and powerful algorithm for eliminating the cell patterns using magnitude spectrum analysis. The first step was to obtain a spectrum for a cell image using the Fourier transform while eliminating larger coefficients using an adaptive filter. Next, an image without the cell pattern was obtained by using the inverse Fourier transform. Finally, the defect pixels were detected using the STD algorithm. The validity of the proposed method was investigated using real TFT-LCD cell images. The experimental results indicate that the proposed technique is extremely effective for detecting defects in TFT-LCD cell images.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1701-1703
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• 2006

Here we describe a novel driving scheme in the form of negative AC bias stress (NAC) to compensate shift in the threshold voltage for hydrogenated amorphous silicon (${\alpha}$-Si:H) thin film transistor (TFT) for AMOLED applications. This scheme preserves the threshold voltage shift of ${\alpha}$-Si:H TFT for infinitely long duration of time(>30,000 hours) and thereby overall performance, without using any additional TFTs for compensation. We briefly describe about the possible driving schemes in order to implement for real time AMOLED applications. We attribute most of the results based on concept of plugging holes and electrons across the interface of the gate insulator in a controlled manner.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.754-758
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• 2002

In order to reach the high quality of organic thin films such as high mobility for device applications, it is strongly desirable to study the growth properties of pentacene film as a function of evaporation condition. Here, we report the structure and morphology of thermal evaporated pentacene thin film by AFM, SEM, and XRD as a function of the evaporation rate and substrate temperature. These results play a key role in determining the electric performance of organic thin film transistor devices.