• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 추계학술대회 논문집
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• pp.177-180
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• 1999

In this paper, we studied Surface Discharge Type Flat Fluorescent Lamp(FFL) with High Luminance for LCD Backlighting. This lamp is Surface Discharge Type structure with a pair of Sodalime glass, insulator layer, phosphor layer, and Xe gas gap. There are two influences of Electric field on different dielectric thickness. The Electric field difference at the dielectric layer itself enhances minimum value of firing voltage and luminance uniformity. So, we measured the Electric filed at 0.5mm, 1mm gap length and discharge voltage for difference dielectric layer thickness. In experiment result, the thicker dielectric layer has higher firing voltage and lower current.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.165-168
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• 2007

Electrooptic characteristics of Xe-type flat fluorescent lamps (FFL) have been investigated by using a Q-V Lissajous method. It was found that the luminance of the Mgo-coated FFL became more than doubled compared to normal FFLs operated at the same driving voltage, indicating the possibility of the efficacy improvement in the MgO-coated FFLs. Change in the driving condition, in particular, the duty ratio had effects on the electrooptic properties, and it was found that the duty ratio of 50% was the optimum condition from the viewpoints of the efficacy and the lamp voltage.

• 전기학회논문지
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• 제56권7호
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• pp.1275-1281
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• 2007

The discharge phenomena in a flat fluorescent lamp for the backlight unit of liquid crystal displays are simulated by sung a two-dimensional fluid model. The numerical methods for the calculation of plasma dynamics and the radiation transport are introduced for the discharge simulation and for the transmission of the vacuum ultraviolet lights. The simulation results are presented to compare the luminance and the luminance efficacy with the variation of gas pressure, gas mixture ratio, driving voltage, and frequency.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2000년도 제1회 학술대회 논문집
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• pp.147-148
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• 2000

Sealing of two glass plates composing of FED panel was done in a vacuum chamber. Several factors related with a heating process of a frit glass were investigated, including comparisons with a conventional method.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권4호
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• pp.161-164
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• 2006

In this thesis we designed the vision system to inspect the defect of a back light unit of plat panel display device. The vision system is divided into hardware and inspection algorithm of defect. Hardware components consist of illumination part, robot-arm controller part and image-acquisition part. Illumination part is made of acrylic panel for light diffusion and five 36W FPL's(Fluorescent Parallel Lamp) and electronic ballast with low frequency harmonics. The CCD(Charge-Coupled Device) camera of image-acquisition part is able to acquire the bright image by the light coming from lamp. The image-acquisition part is composed of CCD camera and frame grabber. The robot-arm controller part has a role to let the CCD camera move to the desired position. To take inspections of surface images of a flat panel display it can be controlled and located every nook and comer. Images obtained by robot-arm and image-acquisition board are saved on the hard-disk through windows programming and are tested whether there are defects by using the image processing algorithms.

• Journal of Power Electronics
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• 제11권1호
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• pp.97-104
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• 2011

This paper proposes a new alternating current driving method for highly capacitive loads such as plasma display panels or piezoelectric actuators, etc. In the proposed scheme, a current balance transformer, which has two windings with the same turn-ratio, provides not only a resonance inductance for energy recovery but also a current balance among all of the switching devices of the driver for current stress reduction. The smaller conduction loss than conventional circuits occurs due to the dual conduction paths which are parallel each other in the current balance transformer. Also, the leakage inductances of the transformer are utilized as resonant inductors for energy recovery by the series resonance to the capacitive load. Furthermore, the resonance contributes to the small switching losses of the switching devices by soft-switching operation. To confirm the validity of the proposed circuit, prototype hardware with a 12-inch mercury-free flat fluorescent lamp is implemented. The experimental results are compared with a conventional energy-recovery circuit from the perspective of luminance performances.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.231-234
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• 2009

In order to realize the high luminance and luminous efficacy MFFLs for LCD backlights, we optimized the phosphor profile to enlarge the surface area. The MFFL with the new phosphor profile shows a very wide luminance range from 2,600 to 17,000 nit with the corresponding luminous efficacy from 66 to 32.5 lm/W. The results were obtained with the color coordinate of the phosphor to be around (0.25, 0.23). And the single cell is expanded into a multi-structured configuration to realize a 32 inch-sized lamp by a simple repetition of the single cells, and a new driving scheme is proposed for an adaptive local dimming and scanning drive using dual auxiliary electrodes and bipolar drive scheme. Especially the ultra high luminance and luminous efficacy results suggest the duty time of illumination of the backlight unit can be significantly reduced.

• 한국광학회지
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• 제20권6호
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• pp.334-338
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• 2009

최근 디스플레이 기기의 수요가 증대되면서 대면적 노광에 대한 요구가 증대되고 있는데, 내부전반사(total internal reflection: TIR)홀로그래픽 리소그라피는 대면적 노광을 위한 효과적인 방법으로 연구가 진행되고 있다. TIR 홀로그래피에서는 일반적으로 레이저를 이용하여 영상을 기록하고 재생한다. 그러나 자외선 램프와 같은 비가간섭광을 이용하여 재생한다면, 가간섭성에 의해 나타나는 영상잡음을 줄일 수 있고, 대면적 노광에도 보다 용이할 것이다. TIR 홀로그램의 재생을 위하여 자외선 램프를 이용할 때, 램프의 유한한 선폭과 확산각이 재생 영상에 미치는 영향을 분석하고, 재생패턴에 나타나는 선폭 확대 결과를 실험을 통하여 검증하였다. ${\mu}m$ 규모의 선폭을 갖는 대면적 패턴을 TIR 홀로그램으로부터 얻기 위한 재생 광원으로, 가간섭성 광원인 레이저 대신 저잡음성과 경제성을 갖춘 일반적인 자외선 램프의 사용이 가능할 것으로 기대된다.

• 한국통신학회논문지
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• 제16권11호
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• pp.1179-1185
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• 1991

초박막 재산화 질화산화막을 $1050^{\circ}C-1100^{\circ}C$ 온도에서 20, 40초 동안 산소 분위기에서 램프 가열 방법의 급속 열처리 공정에 의해 형성 시켰다. 초박막의 전기적 특성은 누설전류, 항복전압, 시간종속 항복과 F-N 관통을 분석 하였다. 질화와 재산화 조건에 따른 전하포획의 의존성 즉 고전계 스트레스에 유기되는 항복전하량$(Q_{BD})$ 증가 여부와 평탄대역 전압이동$(\DeltaV_{FB})$을 연구하였다. 분석 결과에 의하면, 급속 열처리 재산화시 유전적 성질이 상당히 개선되었고, 항복전하량은 증가되었으며, 평탄대역전압은 감소 되었다.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2007년도 추계학술대회 논문집
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• pp.111-113
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• 2007

본 논문에서는 제논 유전체 장벽 방전형 평판형광램프용 Fly-Back방식 전자식 안정기를 설계하였다. 본 전자식 안정기는 Fly-Back방식의 능동형 역률 보상 회로와 인버터회로를 사용하여 기존의 Sine wave의 형태가 아닌 펄스파 형태의 출력을 만드는 고역률, 고신뢰성 전자식 안정기를 제작하였다. 제논 평판형광램프의 점등전압은 고압이 사용되므로 램프 파손의 경우와 무부하의 경우로부터 사고를 방지하기 위해 보호회로를 사용하여 이상전압, 이상전류에 의한 사고를 차단했다.