• Journal of Power Electronics
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• 제9권2호
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• pp.164-172
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• 2009

Recently, 2-dimensional flat light sources have been attracting much attention for its use in LCD backlight applications because of its high luminous efficiency and uniformity. A long-gap discharge, mercury-tree flat fluorescent lamp has been developed, which shows a high brightness ($>5000\;cd/m^2$) and high luminous efficacy (60 lm/W). Additionally, it has a wide operating margin and stable driving condition with the aid of an auxiliary electrode. For driving the lamp, a narrow pulse power to maintain the glow discharge state is required. Since there has been no research for this kind of lamp driving, this paper proposes a newly developed short-pulse, high-voltage lamp-driving scheme. The proposed lamp system uses a ballast with a coupled-inductor in order to raise the short pulse voltage up to the lamp ignition level and to obtain energy-recovery action during the glow discharge mode. The operation principles are presented and also the system performances such as the lighting efficiency, spatial and angular uniformities are evaluated by hardware experiments. The results show that the proposed lighting system is a good candidate for the next-generation of LCD backlight systems.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.443-443
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• 2008

차세대 LCD back light 시스템으로 Xe plasma plat lamp를 주목하고 있으나 자외선 여기 효율이 떨어져 램프의 휘도 및 광 효율이 낮은 단점을 가지고 있어 이에 따른 개선이 요구되고 있다. MgO는 AC-PDP에서 방전전압의 저하, 방전의 안정성, 동작마진과 같은 특성에 영향을 미치고 있기에 이번 연구 에서는 졸겔법으로 제작한 MgO를 프린팅 방법으로 flat fluorescent lamp에 적용하였다. 실험시 사용한 flat fluorescent lamp의 경우 ITO 전극과 MgO layer 그리고 형광체층을 가진 두 장의 유리판 사이에 Ne-Xe기체를 채운 단순한 구조로 제작하였다. 실험은 압력과 방전거리에 따른 특성을 살펴보았으며, 그 결과 MgO layer 채용한 경우 방전 전압의 감소 및 static margin의 증가를 알 수 있었다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 하계학술대회 논문집
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• pp.527-530
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• 2001

In this paper, the basic characteristics of flat fluorescent lamp using ultraviolet generate from gas discharge and powder type electrolyminescent display(P-ELD) using a phenomenon of the light emission eaused by the electrical field applied to phosphor are studied. The lamp is a simple structure with insulator layer, phosphor layer, and gas gap. Current(displacement current + discharge current) in flat fluorescent lamp using.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 추계학술대회 논문집 전기물성,응용부문
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• pp.122-124
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• 2005

The flat panel lamp is used as back light. It is perceived the best type for the wide size LCD of back light system. However, the flat panel lamp has high value of heat. So it need to improve efficiency. Therefore, more researches are requested for the back light of the flat panel lamp. In this paper, the properties of spectrum is investigated according to change in frequency from 30kHz to 60kHz using power supplies voltage with changing from 500V to 700V. As a result, main spectrum peak of plasma showed in 450[nm], 630[nm], 750[nm] and spectrum peak of 750nm is the highest.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 C
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• pp.1792-1794
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• 2001

In this paper, the basic characteristics of flat fluorescent lamp using ultraviolet generated from gas discharge and powder type electro luminescent display using a phenomenon of the light emission caused by the electrical field applied to phosphor are studied. The lamp is a simple structure with insulator layer, phosphor layer, and gas gap. Current(displacement current + discharge current) in flat fluorescent lamp using.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 전력전자학술대회 논문집
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• pp.305-307
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• 2001

In this paper, the basic characteristics of flat fluorescent lamp using ultraviolet generated from gas discharge and powder type electro luminescent display using a phenomenon of the light emission caused by the electrical field applied to phosphor are studied. The lamp is a simple structure with insulator layer, phosphor layer, and gas gap. Current(displacement current + discharge current) in flat fluorescent lamp using.

• 조명전기설비학회논문지
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• 제21권7호
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• pp.6-12
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• 2007

LCD(liquid crystal display) TV용 백라이트의 광원으로서 면광원이 개발되었으며, 이를 이용한 조명 기기를 제작 및 평가하였다. 면광원은 유리성형을 통하여 채널을 형성하였으며 채널의 모양을 최적화하여 면광원을 이용한 조명 기기의 효율을 향상시킬 수 있었다. 본 논문에서는 특히 현재 주로 사용되고 있는 형광등과의 비교 평가를 통하여 조명용 면광원의 광 효율 및 조도 특성에 관한 성능을 평가하였다. 채널의 구조가 최적화된 면광원을 이용하여 제작된 32"형 조명 기기의 광 효율은 72.7[1m/W]이었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1519-1521
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• 2007

In this work, a coplanar-type plasma flat fluorescent lamp having cross type of electrode was fabricated by screen printing and sealing technique. Cross type of electrode with a dielectric layer were screen-printed on a rear glass plate, and then fired at $550^{\circ}C$. Phosphor was printed on and fired at $450^{\circ}C$. Finally, the lamp was sealed by frit glass at $450^{\circ}C$. The lamp of cross electrode type was studied depending on the electrode gap and the thickness of dielectric layer.

• 조명전기설비학회논문지
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• 제25권12호
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• pp.67-73
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• 2011

A method obtaining position data(x, y) of object accurately is proposed by using a pair of ultrasonic sensors composed of one transmitter and two receivers. And the driving system which controls the light of flat LED lamp locally using array of ultrasonic sensors (3 transmitters and 6 receivers) is developed. As a result, measured values of y are relatively reliable due to its small average of absolute errors of 1.03[cm]. The measured values of x have average error of 8.52[cm], and it is a large value. However, the average error is decreased by 0.65[cm] after applying algorithm for error correction. The experiments to control the light of flat LED lamp locally with algorithm for error correction are carried out. From the result, measured values of x with average error of 0.97[cm] are obtained and they are very good approximations of actual values.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2006년도 영호남 합동 학술대회 및 춘계학술대회 논문집 센서 박막 기술교육
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• pp.86-90
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• 2006

Discharge of the flat lamp lighting source research are requested very much. For improving brightness, life time, efficiency of flat lamp, plasma diagnosis of the f1at lamp lighting source to understand property of lighting source is very important. Distance of discharge electrode is 5.5mm and width is 16.5mm, we have measured electron temperature and electron density measured with single Langmuir probe in flat lamp. We have tested the discharge from 100 Torr to 300 Torr pressure. The pulse is rectangular pulse with frequency 20kHz and duty ratio 20%. In result, electron temperature decreases and electron density increase as increase the gas pressure and electron temperature decreases and electron density increase as increase the voltage.