• 전자공학회논문지 IE
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• v.48 no.2
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• pp.47-51
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• 2011

In this paper, we propose the cleaning process system to remove micro-particles, various impurities, unnecessary residues, etc. for liquid crystal display manufacturing processes. This system is structured with cleaning, rinse and drying process using the chemical cleaning of alkaline water and the physical cleaning of SHS(supper heating steam). And we shows cleaning effects of alkaline water and remove effects of SHS.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.57 no.1
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• pp.46-55
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• 2008

In this paper, we designed the bay control unit that is based on the microprocessors and integrates with the new technology of electrical, electronic, and mechanical fields. Nowadays the customers have required much more integrated multi-protection relay, monitoring, control devices and power management for better and easier maintenance, performance, electrical system analysis and communication according to new trend of switchboard This bay controller supplies those requirements of customers with easy handling and operation. This bay controller provides a graphic display with rear-lit liquid crystal LCD and push buttons as kinds of HMI(Human Machine Interface). This bay controller provides the parameter setting program, control setting program, various editors and fault recording and analysis program on Windows/95/98/NT/2000/XP for HMI. In addition, this bay controller can be set manually and this manual setting function helps user to interface easily.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.502-505
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• 2007

In this paper we propose a novel electrode structure for high transmittance in the Patterned Vertical Alignment (PVA) LC cell. Normally, the transmittance of PVA LC cell is depended on the shape of the electrode and cell gap. We studied the area decreasing the transmittance through the electrode structure for wide viewing angle and proposed new electrode design to change LC director configuration in the area. We use the 'TechWiz LCD' for calculation of the director configuration and optical characteristics. We show the comparison of the calculated optical transmittance between the conventional PVA mode and the proposed PVA mode. From the results, we confirm that the optical transmittance of the proposed structure of the PVA cell becomes higher.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.05c
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• pp.28-32
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• 2003

본 논문은 시료의 양을 최소화하고 혈중 요소 및 혈당 농도에 대한 정확한 측정을 위하여 최근에 개발된 전기화학형 마이크로 전극형 센서의 간략한 소개 및 전기적인 특성에 관하여 요약하는 것에서 출발하여 센서로부터 전기신호를 발생시키는 signal conditioning 회로의 설계, microprocessor를 이용한 digital 값으로의 변환 및 data 취득, 취득한 data를 측정된 혈당량 및 요소량으로의 변환 저장 display까지의 휴대용 계측기의 prototype 개발에 관하여 기술한다. 이 계측기는 미량의 혈액채취 한번으로 농도를 측정하는 측정모드와, 측정된 data를 찾아보기 위한 검색모드로 작동시킬 수 있다. Microprocessor의 기능을 최대한 사용하여 측정기의 크기를 소형화하였으며 LCD(Liquid crystal display)틀 채택하는 등 저전력 회로로 구현하였다.

• Proceedings of the KIEE Conference
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• 2003.07b
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• pp.1181-1183
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• 2003

Cold cathode fluorescent lamp(CCFL) are widely used to illuminate the liquid crystal display(LCD). Usually, CCFL dimming methods are used to lamp current regulation or average current adjust feeding the CCFL inverter. Switching frequency of inverter is higher than resonant frequency at stabile states. In this study, design of CCFL driving circuit by half-bridge type series and parallel resonant inverter that variable frequency modulation method to control the output power. This method has advantages such as low EMI and reduced harmonics. And it is easy to dimming control use microprocessor. The validity of this study is confirmed from the simulation and experimental results.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.05a
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• pp.400-403
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• 2009

최근, LCD(Liquid Crystal Display) 산업에서 클린룸의 규모가 커짐에 따라 Stocker 시스템의 사이즈가 커지고 길이가 장거리화 되고 있다. 이에 제조업체는 생산수율을 높이기 위해 Stocker 시스템의 전체 택타임을 줄이기 위한 방안으로 Stocker 시스템의 속도를 증가시키도록 요구하고 있다. 또한, 제조업체는 고유가 시대에 여러 장비들에 대한 에너지 절약을 통한 공장 운영비용이 최소화되도록 요구하고 있다. 따라서 본 논문은 차세대 Stocker 시스템의 에너지 절감과 이송 속도증가에 따른 비접촉 전원시스템의 최적설계를 제안하고, 에너지 절감을 위한 비접촉 전원시스템의 시제품을 제작하여 부하인 크레인의 여러 운전 패턴에 따른 비접촉 전원시스템의 실증시험과 입/출력 특성, 효율 개선에 따른 비접촉 전원시스템을 개발하여 에너지 절감 효과에 대하여 서술하였다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.8
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• pp.1436-1440
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• 2007

Beryllium copper has been known to be an important material for the various fields of industry because it can be used for mechanical and electrical/electronic components that are subjected to elevated temperatures (up to $400^{\circ}C$ for short times). Blade type tip for probing the cells of liquid crystal display(LCD) was fabricated using beryllium copper foil. The dry film resist was employed as a mask for patterning of the blade type tip. The beryllium copper foil was etched using hydrochloric acidic iron-chloride solution. The concentration, temperature, and composition ratio of hydrochloric acidic iron-chloride solution affect the etching characteristics of beryllium copper foil. Nickel with the thickness of $3{\mu}m$ was electroplated on the patterned copper beryllium foil for enhancing its hardness, followed by electroplating gold for increasing its electrical conductivity. Finally, the dry film resist on the bridge was removed and half of the nickel was etched to complete the blade type tip.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.17 no.11
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• pp.1143-1148
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• 2004

In this study, photoresist stripping in semiconductor or LCD (liquid crystal display) fabrication processes using DIO, was investigated. In order to obtain the high PR stripping efficiency of DIO. we have developed new ozone-generating system with high ozone concentration and ozone-resolving system with high contact ratio. In this study, we obtained ozone gas concentrations of 11 % by new ozone-generating system, ozone-resolving efficiency of 99.5 % and maximum solubility of 130 ppm in deionized water. We applied the newly designed equipments to photoresist stripping processes and obtained similar results to SPM(sulfuric-peroxide mixture) process characteristics.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.04a
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• pp.45-46
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• 2006

We have studied the viewing angle control using a twist nematic liquid crystal display (TN-LCDs). These TK-LCDs have the characteristics, of which is not good image quality, for examples low Contrast ratio and gray scale inversion problems at upper and down viewing direction. TN-LCDs have the function of switching between the wide viewing mode and narrow viewing angle mode using two tilted LC layers. Tilt angles of the two LC layers, $14^{\circ}$ and $60^{\circ}$ were required in both wide viewing angle and narrow viewing angle modes, respectively. Consequently, this device is compatible with two image performances of which the wide viewing angle mode and Narrow viewing angle mode.

• Proceedings of the KIEE Conference
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• 2005.10c
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• pp.220-222
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• 2005

The Cold cathode fluorescent lamp(CCFL) are used to illuminate the liquid crystal display(LCD). Ballasts are required for CCFL because the lamp need high starting voltage and behave negative dynamic resistant characteristics in the desired region of operation. In this paper, the lamp impedance model is proposed, and this model is established from some equations and measured electrical characteristics of CCFL. The validity of porposed lamp model is verified from the simulation and experimental results.