• 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.

• Proceedings of the KIEE Conference
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• 2002.11a
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• pp.71-73
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• 2002

본 연구에서는 TFT-LCD 의 동작특성을 정확하게 계산하기 위해 준 실험적인 TFT 모델을 사용하여 a-Si TFT poly-Si TFT, Organic TFT에 대하여 파라미터를 추출하였다. 이렇게 추출된 TFT의 파라미터를 TFT-LCD 등가회로에 적용하여 화소의 동작 특성에 관하여 연구하였다. 또한 보다 정확한 시뮬레이션을 위하여 VLSI분야에서 사용되는 준 실험적인 정정용량 모델과 액정의 특성과 인가된 전압에 의존하는 액정 용량모델들을 사용하여 화소의 충 방전 특성을 시뮬레이션 하였는데 대면적 고화질의 패널일수록 특성이 우수한 TFT가 적용되어야 하며, 유기 TFT를 TFT-LCD에 적용시키기 위하여 유기 TFT의 성능향상 및 고전압의 구동방식이 필요하게 된다.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.250-253
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• 2008

A touch screen panel embedded 12.1-inch TFT LCD employing a standard a-Si:H TFT process has been successfully developed. Compared with conventional external touch screen panels, the new internal TSP exhibits a clearer image and improved touch feeling. Our new internal proposed TSP can be fabricated with low cost.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.363-366
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• 2011

3D 디스플레이 시장이 커지면서 TFT-LCD TV 자동화 라인 생산 공정을 3D LCD TV 생산 공정으로 변환하여 대량 생산할 경우, 기 설치된 자동화 생산라인의 H/W 부분에는 특별한 투자가 이루어질 거라 판단되지 않고 있다. 하지만 3D LCD Module 검사 등의 S/W 적인 부분은 현재의 기 설치된 TFT-LCD Module 검사장비로는 검사가 불가능하여, 추가적인 투자가 이루어질 것이라 판단되고 있다. 이와 관련하여 본 연구에서는 TFT-LCD 제조공정의 효율적인 기술을 제안하고자 한다. 첫째는 TFT-LCD를 Cell상태에서 직접 구동하는 구동회로 기술과 사용 장소가 Clean Room이므로 개별적 구동 Pallet에 비접촉식으로 전원을 공급할 수 있는 비접촉식 급전장치에 대한 기술이다.

• Journal of the Korean Data and Information Science Society
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• v.16 no.4
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• pp.823-833
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• 2005

This paper deals the TFT-LCD process and quality, process control problems of the process. For improvement of the process quality and yield, we apply a data mining technique to the LCD industry. And some unique quality features of the LCD process are also described. We describe some preceding researches first and relate to the TFT-LCD process and the problems of data mining in the process. Also we tried to observe the problems which need to solve first and the features from description below hazard must be considered a quality mining in LCD industry.

• Journal of the Korean Institute of Telematics and Electronics A
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• v.32A no.12
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• pp.149-158
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• 1995

This paper describes the development of a software tool LCD FRAME that may guide the analyzing process for the electrical characteristics and the design procedure for constructing the thin film transistor liquid crystal display(TFT/LCD) packages. LCD FRAME can analyze its electrical characteristics from the TFT/LCD system package configuration, and provide the design variables to meet the user's requirements. These analysis and design procedure can be done in real time according to the model at simplified package level of TFT/LCD. LCD_FRAME is an object-oriented expert system which considers package elements as objects. With this LCD_FRAME software tool, we analyzed the I-V characteristics of a-Si TFT and its signal distortion which has maximum 1.58 $\mu$s delay along the panel scan line of the package containing 480 ${\times}$ 240 pixels. We designed the package structure of maximum 6.35 $\mu$s signal delays and 3360 ${\times}$ 780 pixels, and as a result we showed that the proper structure of 20 $\mu$m scan line width, 60$\mu$m panel TFT gate width and 8 $\mu$m gate length. This LCD_FRAME software tool provides results of the analysis and the design in the form of input files of the SPICE program, text data files, and graphic charts.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.05a
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• pp.209-212
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• 2008

During several years, lots of industrial and individual products have been developed based on the text or graphic LCD module which has been gave the short developing period to the developer. With the advent of home networks and intelligent robots, the need for interaction between human and instruments has been increased. Recently, goods with a TFT-LCD come out. But in spite of a simple required performance, the complicated microprocessor, such as ARM processor, is required to interface the TFT-LCD and touch screen. Our research and development is to develope an embedded TFT-LCD module in order to use or apply to the goods through the simple interface by the general users as well as the developers. We adopt the RTOS(real time operating system) in order to operate TFT-LCD independently and various communication protocols are provided in order to offer the simple interface to users and developers.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.1
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• pp.19-27
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• 2007

In this paper, we develope and implement a TFT-LCD cell defects detection algorithm using morphology. To detect the bright line or dark line defects and the bright pixel or dark pixel defects of the TFT-LCD cells, we determine the shape of the morphology operators considering the shape characteristics of the TFT-LCD sub pixels. Using dilation, erosion, and the subtraction operators, we extract gray level defects information. Then, we apply the optimal threshold method which shows the best results in terms of several criteria. Finally, we determine the defects using labelling method. From various experiments using TFT-LCD panels, the proposed algorithm shows superior results.

• Proceedings of the Safety Management and Science Conference
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• 2004.05a
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• pp.283-289
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• 2004

The number of pixel defects including bright and black dots on a panel is one of the critical factors determining the quality of TFT-LCD. Since pixel defects on the TFT-LCD panels are sometimes unavoidable, manufacturers have to inspect the panels so that any panel with an unacceptable number of defects will not be delivered to the buyers. However, the buyers demand for the manufacturers to meet different pixel defects tolerances (acceptable number of pixel defects on a TFT-LCD panel) around central(tight) and peripheral(loose) inspection zones. The disagreement in quality standard among different buyers also cause confusions in screening non-confirmative products and unstable yield of production. Few research has focused on the effects of defect locations on a TFT-LCD panel on their detection probabilities and the rational division of defect inspection zones. In this research, experiments were conducted to find the detection probabilities of black dot defects with respect to their varying locations on a TFT-LCD. It is proposed a rational division of inspection zone on a TFT-LCD panel on the basis of detection probabilities of the defects. With these division of inspection zones and the mean defect detection probability within each zone, it is expected to establish a more reasonable pixel defects tolerances.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.597-600
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• 2006

The silver gate and source/drain electrodes for an a-Si thin film transistor were fabricated by the selective electroless plating (SELP) process. Relevant physical properties including taper angle, uniformity and resistivity are investigated. The Ag layer was about 150nm to 250nm thick, the resistivity less than $3{\times}10^{-6}$ Ohm-cm and the taper angle 45'-60' and the nonuniformity less than 10% on G2 substrates. The transfer characteristics with the Ag gate, and source/drain electrodes respectively possessed good field effect mobility similar to conventionally fabricated a-Si TFTs. This process provided low resistivity, low cost and ease of processing.