• KIEE International Transactions on Electrophysics and Applications
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• v.2C no.6
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• pp.292-296
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• 2002

A new sustain driving method for the AC PDP is presented. In this driving method, the voltage source is connected to a storage capacitor, this storage capacitor charges an intermediate capacitor through LC resonance, and the panel is charged from the intermediate capacitor indirectly. In this way, the current flowing into the AC PDP when the sustain discharge occurs is reduced because the current is indirectly supplied from a capacitor, a limited source of charge. Thus, the input power to the output luminance efficiency is improved. Since the voltage supplied to the storage capacitor is doubled through LC resonance, this method call drive an AC PDP with a voltage source of about half of the voltage necessary in the conventional driving methods. The experiments showed that this charge-controlled driving method could drive ail AC PDP with a voltage source of as low as 107V. Using a panel of the conventional structure, luminous efficiency of 1.28 lm/W was achieved.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1999.11a
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• pp.42-48
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• 1999

An experimental study was performed to discover the effect of environment on the tribological behavior of Si-incorporated diamond-like carbon(Si-DLC) film slid on a steel ball. The films were deposited on Si(100) wafers from radio-frequency glow discharge of mixtures of benzene and dilute silane gases. Experiments using a ball-on-disk test-rig was performed under vacuum, dry air and ambient air conditions. It was observed that coefficient of friction was decreased as the environmental condition changes from vacuum, to dry air. It was also observed that the coefficient of friction decreased with increasing silicon concentration in the film. Chemical analyses of debris suggested that the low and stable friction coefficient is closely related to the silicon rich oxide debris and the rolling action.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.106-106
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• 2010

AC PDP(Plasma Display Panel)는 상압에 가까운 압력에서 DBD(Dielectric Barrier Discharge) 방전을 이용한 디스플레이다. AC PDP는 보통 면 방전을 이용하기 때문에 대향 방전과는 다른 방전 현상을 보인다. 본 연구에서는 4인치 test 패널 제작하여 격벽 높이 변화에 따른 방전 현상을 연구하였다. PDP 셀은 $1mm^3$ 보다 작은 크기를 가지고 있기 때문에 방전 현상을 분석하는 것은 쉽지 않다. 그래서 이 연구에서는 2, 3차원 유체 시뮬레이션을 이용하여 실험 결과에 대한 방전 현상을 연구하였다. 테스트 패널을 통하여 정적 마진, 휘도, 소비전력, 발광효율 등을 구하였고, Fluid 시뮬레이션을 통하여 전기장 분포, 하전입자 및 여기종 입자들의 개수 및 밀도 분포, 벽전하 분포 등을 통하여 방전 특성의 경향성을 분석하였다. 격벽 높이가 높아질수록 방전 공간이 넓어지면서 효율이 증가하였으나 $140\;{\mu}m$ 이상의 높이에서는 광 변환 효율이 감소하면서 효율이 오히려 감소하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.02a
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• pp.490-490
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• 2012

Ballast capacitor에 저장된 에너지로 방전 에너지를 조절할 수 있는 방전장치를 개발하였다. 본 연구에서는 ballast capacitor의 용량을 조절하여 micro-size의 아크 플라즈마를 발생시켰으며, 용량변화에 따른 플라즈마의 온도를 측정하였다. 또한 ICCD camera를 이용하여 ballast capacitor의 용량변화에 따른 cathode의 변화를 관찰하였다. Optical Emission Spectroscopy를 통하여 플라즈마의 광학적 특성을 분석하였다. 마이크로 아크 방전의 주파수를 높이기 위하여 switching device를 병렬로 연결하여 아크 플라즈마를 구동시켰으며, 발생된 마이크로 아크 플라즈마는 정밀방전 가공에 응용되었다. 본 연구는 2011년도 지식경제부의 재원으로 한국에너지 기술평가원(KETEP)의 지원을 받아 수행한 연구 과제입니다(No. 20104010100670).

• 한국정보디스플레이학회:학술대회논문집
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• 2000.01a
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• pp.121-122
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• 2000

The understanding of reset scheme is essential for the driving of AC PDP (Plasma Display Panel). The characteristics of reset period of AC PDP was examined with the variation of pulse time and voltage in the ADS (Address Display Separated) driving method presented by Fujitsu,. The addressing characteristics showed drastic change as a function of the erasing time and addressing pulse width. In this paper, these results were explained by the change of wall charge variation, and it was estimated with the currents through each electrode.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.251-254
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• 2005

A new driving waveform was proposed to reduce the cost in PDP-TV based on Vt close curve by eliminating the common (X) board under the conventional 42-inch panel structure. Due to the serious misfiring problem during a sustain-period when applying the new driving waveform, the wall voltage was measured and analyzed after the reset-period using Vt close curve. As a result of adopting the proposed driving waveform designed using Vt close curve analysis, the cost of PDP module could reduce compared with the conventional PDP module without any misfiring discharge.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07a
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• pp.259-262
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• 2005

Image retention is a kind of fatal shortcoming of the AC PDPs for realizing high-quality picture. In this work, the measurement method of image retention was proposed using temporal measurement of luminance, CIEXYZ tristimulus values, IR emission of reset pulse, and temperaturel. On the base of temporal measurement of luminance, CIEXYZ tristimulus value, and IR emission of reset pulse, the retention time of Ne+5%Xe gas-mixture discharge was about 2 hours after white window image. However, it was about 20 minute on the base of temporal measurement of temperature.

• Journal of Information Display
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• v.5 no.1
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• pp.16-21
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• 2004

The effects of an auxiliary address pulse driving scheme, in which an auxiliary short pulse is applied to the address electrode during a sustain-period, were examined under the various image patterns of the 42-inch WVGA ac-PDP. When the auxiliary address pulse driving scheme was applied, the luminance of the red, green and blue cells were measured respectively. And the luminance, luminous efficiency, and current were measured under the full-white pattern of the 42-inch ac-PDP. As a result, the luminance of blue cells was improved approximately by 17 %, whereas the luminous efficiency of the full-white pattern was improved approximately by 34 % without a misfiring discharge in comparison with conventional driving scheme.

• Proceedings of the KIEE Conference
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• 1998.07e
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• pp.1785-1787
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• 1998

The plasma display panels with newly designed sustain electrode structure have been proposed and its characteristics hate been measured. One has a enlarged discharge path, and the other has a concentration point of electric potential. These structures have a high luminance and luminous efficiency.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2002.11a
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• pp.492-494
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• 2002

The fundamental principles of the operation of microwave discharges that are used to convert microwave energy to broad spectrum visual light are known. In this paper, emission dependance of microwave discharges in mixture content of sulfur with noble gases was studied. It is shown that the excitation of this gaseous mixture is carried out in two phases: (1) ionization of noble gas atoms by a microwave field and (2) the consequent maintenance of slightly ionized nonequilibrium plasma by the field. These two processes have essentially various thresholds for the microwave pump. The purpose of this work is to investigate spectral properties of the high frequency discharges in a mixture sulfur vapors with noble gases.