• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.1179-1182
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• 2005

Nowadays, CRTs are threatened by the flat panel displays (FPD). The screen quality of the CRT is one of best among the displays, however, the depth of CRTs becomes one of the most important design factor to maintain the dominated portion in the display market. When designing slim CRTs, the structure of the glass is important design factor because of the weight and safety. The stress in the glass is increased according to the shortening the total length of tube. The residual stress of the seal is also a major factor should be considered due to the large seal edge thickness. The glass design concept for Vixlim is introduced in this paper.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.222-224
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• 2008

BLUs(Backlight Units) are major component in LCD(Liquid Crystal Display) industry which occupies 90% or more of worldwide FPD(Flat Panel Display) market. And BLU market is expected to be expanded continuously according to the trend of miniaturization, slimness, low power consumption and low weight. The larger the BLU market scale, the more important standardization of performance evaluation techniques to clearly prescribe the product specification. This document is a generic specification of measurement methods of LED BLU for LCDs. It defines general procedures for quality assessment and gives general rules for measuring methods of LED BLU for LCDs.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2006.05a
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• pp.259-264
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• 2006

ITO 투명전도막은 현재 FPD(flat panel display)소자의 전극으로 사용되고 있다. 특히 근래에 많은 연구가 진행되고 있는 유기발광다이오드(organic light emitting diode: OLED) 소자의 제작에 투명전도막으로 많은 응용이 되고 있다. ITO 를 이용한 디스플레이 소자는 ITO 의 계면 상태와 전기적 특성에 따라 그 특성이 크게 변한다. 본 연구에서는 $O_2$ 플라즈마 처리를 통하여 ITO 투명전도막의 전기적 특성 및 표면상태의 변화에 대하여 조사하고, 이러한 특성 변화에 따라 현재 많은 연구가 진행되고 있는 OLED 소자의 제작에 응용하기 위하여 유기용액을 이용한 접촉각 측정을 통하여 $O_2$ 플라즈마 처리에 따른 ITO 투명전도막과 유기용액의 접착력에 대하여 고찰하였다.

• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2005.05a
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• pp.219-223
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• 2005

Nowadays laser cutting is the most promising method of cutting FPD(Flat Panel Display) glass in mass-production line. And this method can also be used to cut other brittle materials such as quartz, sapphire, ceramic and semiconductor The concept of this method is shown in picture 1. Laser beam heats glass up to strain point, not to melting point and cooling system chills glass to induce maximun thermal stress in glass surface and then the thermal stress generates micro thermal crack, in other words blind depth of crack, along laser beam and cooling line.

• Journal of the Ergonomics Society of Korea
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• v.32 no.1
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• pp.9-16
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• 2013

Objective: The aim of this study is to investigate a trend of human error types observed in a series of verification and validation experiments for an Advanced Control Room(ACR) equipped with Lager Display Panel(LDP), Work Station Flat Panel Display(WS FPD), list type Alarm System(AS), Soft Control(SC) and Computerized Procedure System(CPS). Background: Operator behaviors in a fully computerized control room are quite different from those in a traditional hard-wired control room. Operators in an ACR all together monitor plant status and variables through their own interface system such as LDP and WS FPD, are notified of abnormal plant status through their own list type AS, control the plant through their own SC, and follow the structured procedure through their own CPS whereas operators in a traditional control room only separately do their duty directed by their supervisor. Especially the secondary task such as manipulating the user interface of ACR can be an extra burden to all the operators including the supervisor. Method: The Reason's human error classification method was applied to operators' behavioral data collected from a series of verification and validation experiments where operators showed their plant operational behaviors under a couple of harsh scenarios using the ACR simulator. Results: As operators accustomed to the new ACR system, knowledge or rule based mistakes appearing frequently in the early series of experiments decreased drastically in the latest stage of the series. Slip and lapse types of errors were observed throughout the series of experiments. Conclusion: Education and training can be one of the most important factors for the operators accustomed to the traditional control room to be adapted to the new system and to run the ACR successfully. Application: The results of this study implied that knowledge or rule based mistakes can be reduced by training and education but that lapse type errors might be reduced only through innovative improvement in human-system interface design or teamwork culture design including a new leadership style suitable for ACR.

• Journal of Institute of Control, Robotics and Systems
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• v.15 no.9
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• pp.887-893
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• 2009

In this paper, a mask-panel alignment robot system is considered for IT industry applications. Two kinds of solutions are suggested which are required in constructing a control system for the alignment robot with actuation redundancy. First, the kinematic solution for the 4PPR parallel positioning mechanism is formulated for an arbitrary initial posture, which relates the mask-panel misalignment in the task space and the desired actuator displacements in the joint space. Secondly, in order to increase the stiffness of the control motion and also to avoid the mechanical lock which may happen due to the redundant actuation, a new synchronous control method is proposed which has the merit of coordinating joint control motions while not losing individual joint control performance. In addition, the engineering process to develop a visual alignment robot system is described with the results of experimental setup and GUI software. Finally, the experimental results demonstrate the effectiveness of the proposed alignment system control methodology and how much beneficial it will be in real industrial applications.

• Journal of Institute of Control, Robotics and Systems
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• v.14 no.4
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• pp.336-341
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• 2008

Recently, research on a flat panel display(FPD) has focused on organic light-emitting display(OLED) which has wide angle of view, high contrast ratio and low power consumption. ITO(Indium-Tin-Oxide) films are the most widely used material as a transparent electrode of OLED and also in many other display devices like LCD or PDP. The performance and efficiency of OLED is related to the surface condition of ITO coated glass substrate. The typical surface defect of glass substrate is measured for electric characteristics and physical condition for transmittance and roughness. Since ITO coated glass substrate can be destroyed for inspection about surface roughness, sheet resistance, film thickness and transmittance, precise fabrication condition should be made based on the estimated relationship. In this paper, ITO films were prepared on the commercial glass substrate by the Ion-Plating method changing the partial pressure of gas(Ar, 02) and the chamber temperature between $200^{\circ}C$ and $300^{\circ}C$. The characteristics of films were examined by the 4-point probe, supersonic thickness measurement, transmittance measurement and AFM. We estimated the relationship between processing parameters(Ar gas, O2 gas, Temperature) and properties of ITO films (Sheet Resistance, Film Thickness, Transmittance, Surface Roughness).

• Proceedings of the KIEE Conference
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• 2005.05a
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• pp.203-205
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• 2005

A reactor protection system (RPS) plays the roles of generating the reactor trip signal and the engineered safety features (ESF) actuation signal when the monitored plant processes reach predefined limits. A Korean project group is developing a new digitalized RPS and the Cabinet Operator Module (COM) of the RPS which is used for the RPS integrity testing and monitoring by an equipment operator. A flat panel display (FPD) with a touch screen capability is provided as a main user interface for the RPS operation. To support the RPS COM user interface design, actually the FPD screen design, we developed a user interface style guide because the system designer could not properly deal with the many general human factors design guidelines. To develop the user interface style guide, various design guideline gatherings, a walk-though with a video recorder, guideline selection with respect to user interface design elements, determination of the properties of the design elements, discussion with the system designers, and a conversion of the properties into a screen design were carried out. This paper describes the process in detail and the findings in the course of the style guide development.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2008.06a
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• pp.468-468
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• 2008

IZO(Indium zinc oxide) 박막은 화학적으로 안정하면서, 가시광 영역 (380~780 nm)에서 80% 이상의 높은 투과도와 낮은 전기비저항, 3.5 eV 이상의 넓은 밴드갭 특성을 가진다. IZO 박막의 이러한 특성 때문에 평판표시소자 (Flat Panel Display; FPD) 및 태양전지와 같은 광전소자들의 차세대 투명전도성 산화물(Transparent Conducting Oxide; TCO) 박막 재료로 주목 받고 있다. 특히 평판표시소자(FPD)들의 고해상도, 대면적화 및 경량화로 인해 투명전극용 박막의 고품위 특성이 요구되고 있다. 현재 투명 전극으로 널리 사용되고 있는 고가의 ITO(indium tin oxide)를 대체할 다성분계 산화물 투명 전극 중에서 투광성과 전기전도도가 좋은 IZO 박막에 대한 많은 연구가 진행되고 있다. 이러한 IZO 박막의 광학적, 전기적 특성은 박막 내의 조성 차이와 미세구조에 의해 결정된다. 따라서 고품위의 IZO 박막 형성을 위해서 결정구조와 미세구조에 대한 분석이 필수적이다. 본 연구에서는 Si(100) 기판 위에 DC-sputtering으로 증착한 IZO 박막의 열처리 온도에 따른 구조적 특성을 알아보기 위해 300~$600^{\circ}C$ 공기분위기에서 1시간 동안 열처리 하였다. 표면 형상(surface morphology)은 원자현미경(AFM). 결정구조는 X-선 회절(XRD)로 분석하였고, 미세구조는 투과전자현미경(TEM)으로 관찰하였다.

• The Transactions of the Korean Institute of Power Electronics
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• v.10 no.6
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• pp.578-586
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• 2005

Recently, due to the launch of digital broadcasting service, the demand of Flat Panel Display (FPD) is sharply rising. Among them, the PDP is expected to be one of the most promising digital displays of next generation because of its large screen size, high resolution, thinness and board field of view. Meanwhile, the PDP uses ADS (Address Display-period Separation) scheme which divide one subfield into address and sustaining period to express the grey scale of images. Since the output of sustaining power module Is mostly used for sustaining period, the load of the sustaining power module can be considered as a pulsating load. Due to this particular load condition, if the wide ZVS range of the power switches is not guaranteed, the hard switching causes large amount of switching loss and serious thermal problem in power module. In this paper, a high efficiency power conversion circuit for 60' PDP sustaining power module which achieves wide ZVS range with the help of additional ZVS tank is proposed. According to the various gating methods, the different operations of the proposed converter are presented. And, to confirm the properties of the proposed converter, an experimental prototype of 900W power converter is constructed md tested. As a result, more than $92\%$ of high efficiency is obtained at $10\%$ load condition, and the ZVS operation is achieved from full load to $10\%$ load condition.