• 비파괴검사학회지
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• 제25권1호
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• pp.1-8
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• 2005

본 연구에서는 TV 유리패널의 등색프린지 분포를 광탄성 4단계 위상이동법에 의하여 측정한 실험결과를 제시하였다. 재래식 광탄성법에서는 등색 프린지 차수를 각각의 점에 대해서 수작업으로 측정한다. 4단계 위상이동법을 이용하기 위하여, 원형편광기 요소들은 등색프린지분포가 측정되는 지점 혹은 선상을 따라 등경각 방향에 일치시켜야 한다. 4단계 위상이동법은 원형편광기의 검광판을 $0^{\circ},\;45^{\circ},\;90^{\circ}$ 및 $135^{\circ}$ 회전시켜 얻은 4개의 영상을 이용한다. 4단계 위상이동법을 적용하기 위해서는 등경각이 측정하고자 하는 지점이나 선상에 일치하도록 편광기 요소를 정렬시켜야 한다. 4단계 위상이동법으로부터 얻은 실험결과는 세나르몽보간법에 의해 측정한 값과 비교한 결과 서로 잘 일치하였다. 또한, TV 유리패널의 열처리 전 후에 등색프린지 분포를 비교하였다. 측정 결과, TV 유리패널의 열처리 전 후의 등색프린지 차수는 약 2배정도 차이가 나타났다.

• 한국정밀공학회지
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• 제19권11호
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• pp.89-95
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• 2002

A shadow mask inside the Braun tube of a TV is sustained by springs attached to the glass panel, its vibration cause the picture image to discolor, which is called the microphonic phenomenon. It is found that it results from resonance when the natural frequency of the shadow mask coincides with that of built-in speaker sound. This paper describes experimental and analytical investigations by using FEM on the vibration problem of the shadow mask assembly. The simulation scheme may be efficiently used to develop a new design for a large-screen flat TV.

• 자원리싸이클링
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• 제24권1호
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• pp.58-65
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• 2015

국내 디스플레이 산업의 핵심기술과 글로벌 점유율은 세계 최고 수준이지만 폐 디스플레이의 재활용 관련한 전반적 기술은 매우 미흡하고 폐 디스플레이의 유리소재는 전량 매립하고 있는 실정이다. 본 논문에서는 폐 초박막 액정표시장치(Thin Film Transistor Liquid Crystal Display) 유리를 고강도 콘크리트 파일 및 발포체의 원료로 재활용 하는 연구, 초박막 액정표시장치 제조 공정에서 발생하는 불량품인 파유리를 장섬유 및 단섬유 등으로 재활용 하는 연구 동향에 대하여 조사하였다. 폐유리를 재활용한 원료 성분은 고강도 콘크리트 파일과 발포체 원료로 재료 재활용이 가능한 것으로 입증되었으며 특히 콘크리트 파일의 경우 기존 제품보다 향상된 특성을 나타내었다. 이외에도 파유리를 장섬유나 단섬유로 재활용 하는 기술은 이미 상용화 단계에 있으므로 향후 폐 디스플레이 유리 소재의 상용화 재활용 시스템을 구축할 수 있는 기술을 확립하는 방향으로 연구를 진행할 필요가 있다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.79-80
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• 2006

In order to raise productivity of the OLED and realization of the OLED TV, it is required to improve the design of the board size glass panel. The large-size glass substrate has some difficulties regarding its deflection during handling operation due to its small thickness (0.7t) which is not even enough to stand its mass itself. This paper is demonstrating a new solution of this difficult through clamping and bending end condition, which helps to minimize the deflection of the glass substrate.

• 대한기계학회논문집A
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• 제30권7호
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• pp.741-749
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• 2006

For last couple of decades, uses of TFI-LCDs have been expanded to many FPD(Flat Panel Display) applications including mobile displays, desktop monitors and TVs. Furthermore, there has been growing demand for increasingly larger LCD TVs. In order to meet this demand as well as to improve productivity, LCD manufactures have continued to install larger-generation display fabrication facilities which are capable of producing more panels and larger displays per mother glass(substrate). As the size of mother glass becomes larger, a robot required to handle the glass becomes bigger accordingly, and its end effectors(arms) are extended to match the glass size. With this configuration, a considerable static deflection occurs at the end of the robot arms. In order to stack maximum number of mother glasses on a given footprint, the static deflection should be compensated. This paper presents a novel static deflection compensation algorithm. This algorithm requires neither measurement instrument nor additional vertical axis on the robot. It is realized by robot controller software. The forward and inverse kinematics considering compensation always guarantees a unique solution, so the proposed algorithm can be applied to an arbitrary robot position. The algorithm reduced static deflection by 40% in stationary robot state experiment. It also improved vertical path accuracy up to 60% when the arm was running at its maximum speed. This algorithm has been commercialized and successfully applied to a seventh-generation LCD glass-handling robot.

• Journal of Information Display
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• 제10권2호
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• pp.54-61
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• 2009

The results of the optimization of the organic passivation process for fabricating thin-film transistors (TFTs) with a high aperture ratio on a seventh-generation glass (2200${\times}$1870 mm) substrate for LCD-TV panels are reported herein. The optimization of the organic passivation process has been verified by checking various factors, including the material properties (e.g., thickness, stain, etching, thermal reflow) and the effects on the TFT operation (e.g., gate/data line delay and display-driving properties). The two main factors influencing the organic passivation process are the optimization of the final thickness of the organic passivation layer, and the gate electrode. In conclusion, the minimum possible final thickness was found to be $2.42{\um}m$ via simulation and pilot testing, using the full-factorial design. The optimization of the organic passivation layer was accomplished by improving its brightness by over 10 cd/$m^2$ (ca. 2% luminance) compared to that of the conventional organic passivation process. The results of this research also help reduce the reddish stain on display panels.

• 한국정밀공학회지
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• 제22권3호
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• pp.115-122
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• 2005

As the digital TV markets rapidly growing, many manufacturers introduce large size flat screen TV units. There are two different display types available to large size models which are plasma and TFT-LCD. Since both are constructed with thin large panels that are mostly fragile to even moderate mechanical shock inputs. Some large size panels are severely resonated by the acoustic sound generated TV which deteriorates video quality. Recognizing the potential problems of large displays, accurate measurement of the panels is to be an essential task for the reliable design. Measurement of mechanical properties of a thin large crystallized panel such as TFT-LCD display with traditional material testing equipments is challenging. Since TFT-LCDs are constructed with combination of brittle glass panels, polymer sheets, and liquid crystal, their properties are not only anisotropic but also usually non-linear. Accurate measurement of the properties often requires very expensive facilities. Especially when the size of the test sample is as large as 40-inch or wider, direct measurement cost is prohibitive. Even worse, machining of the large TFT-LCD to make a smaller size specimen that could be fit into a material tester is not possible because of liquid crystal leakage. A new method fer the measurement of elastic modulus of large TFT-LCD panel is presented in this article. The suggested method provides a simple, economic, and user-friendly way fer measuring the elastic modulus of large panels with considerable level of accuracy.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1673-1675
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• 2006

As the manufacturing capacity needs for large size LCD TV shifts very fast into next generation, processing and test equipment makers face more difficult challenges in accommodating productivity, reliability and lead time of panel makers as well as the prerequisite of high process quality. In this paper, AKT will discuss its new innovative productivity solutions in PECVD (Plasma Enhanced Chemical Vapor Deposition), as the key thin film process system, and EBT (Electron Beam Test), as the key array test system, for the huge glass size with surface dimension larger than 2 meter by 2 meter.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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• pp.1263-1266
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• 2008

TFT-LCD panel makers have been enlarging size of TV screens, and 50-inch TFT-LCD is one of the main stream products already. To have more improved resolution, productivity and lower manufacturing cost, new TFT-LCD factories adopt large mother glass, new TFT structure and new process/materials. Along with these technology evolution, laser repair system should equip with upgraded performance and additional functions on user's demand. Laser repair technology is reviewed and newly developed repair technology is being introduced.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.541-544
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• 2002

The reflective liquid crystal(LC) imager in one panel Liquid Crystal on Silicon(LCoS) System must have the properties such as fast response time, high contrast ratio(C/R) and voltage holding ratio(VHR) which are more related to the lifetime of imager than the others. As the high-output light including a short wavelength from UHP lamp is exposed to LCoS imager, the indium metal impurities, which decrease the C/R and VHR, are diffused from ITO thin film on glass. To ensure the high reliable LCoS imager for HD projection TV, we have studied the effects of the plasma treatment on ITO film to reduce impurities in imager.