• 한국산학기술학회논문지
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• 제12권3호
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• pp.1308-1312
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• 2011

CCFL(Cold Cathode Fluorescent Lamp)는 LCD의 BLU와 특수조명용으로 널리 활용되고 있다. CCFL 제조공정에 있어 CCFL 전극 산화막이 형성되어 솔더 불량을 가져오기 때문에 산화 막 제거가 필요하다. 본 논문에서는 CCFL 전극 산화 막 제거를 위하여 플라즈마 처리를 수행하였다. 플라즈마 처리 최적 공정 확보하기위하여 면 저항, XRD, AFM, 솔더링 테스트 등의 분석이 진행되었다. 플라즈마 최적 공정 조건인 사용전력 600W와 처리시간 70초에서 최소의 면 저항과 최대의 솔더 피복 비율이 측정되었다. 이와 같은 현상은 플라즈마 처리로 구리 산화 막 제거에 기인한 것으로 확인되어 플라즈마를 이용한 전극 산화 막 제거 공정은 CCFL 전극 처리 공정에 활용이 기대된다.

• 한국융합학회논문지
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• 제11권11호
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• pp.183-187
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• 2020

LCD BLU의 CCFL 전극에 사용되는 몰리브덴 전극의 주요소재인 몰리브덴 컵과 몰리브덴 핀은 국내 가공기술이 개발되지 못하여 전량 일본에서 수입하여 사용되고 있어 CCFL 제조업체들의 납기 및 경쟁력에 부담을 주고 있다. 본 연구에서는 LCD BLU의 CCFL 전극에 사용되는 몰리브덴 핀의 제조 기술을 개발하는 연구로 직선처리 기술개발, 몰리브덴 와이어 표면처리 기술개발, 와이어 절단기술 개발, 몰리브덴 핀의 제작, 검사용 JIG와 Fixture 설계 및 제작, 몰리브덴 핀 시제작 및 해석, 몰리브덴 핀 전수검사 기술개발에 관한 연구를 수행하였으며 본 논문에서는 몰리브덴 핀 제작에 있어 전수검사기 융합설계에 대한 연구를 다루고자 한다.

• 한국융합학회논문지
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• 제11권6호
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• pp.197-201
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• 2020

LCD BLU의 CCFL 전극에 사용되는 몰리브덴 전극의 주요소재인 몰리브덴 컵과 몰리브덴 핀은 국내 가공기술이 개발되지 못하여 전량 일본에서 수입하여 사용되고 있어 CCFL 제조업체들의 납기 및 경쟁력에 부담을 주고 있다. 본 연구에서는 LCD BLU의 CCFL 전극에 사용되는 몰리브덴 핀의 제조 기술을 개발하는 연구로 직선처리 기술개발, 몰리브덴 와이어 표면처리 기술개발, 와이어 절단기술 개발, 몰리브덴 핀의 제작, 검사용 JIG와 Fixture 설계 및 제작, 몰리브덴 핀 시제작 및 해석, 몰리브덴 핀 전수검사 기술개발에 관한 연구를 수행하였으며 본 논문에서는 몰리브덴 핀제작 및 검사용 JIG and Fixture의 설계 및 제작에 대한 연구를 다루고자 한다.

• Journal of Welding and Joining
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• 제27권4호
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• pp.73-78
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• 2009

Characterization of the microweld CCFL electrode for the TFT-LCD backlight unit was carried out in terms of the glass beading heat treatment conditions. We evaluate the weld zone and parent metal of the microweld CCFL electrodes that were exposed to simulated glass beading heat treatment. The CCFL electrode was composed of the cup made with pure Ni, the pin made with pure Mo and the lead wire made with Ni-Mn alloy. Each part of the electrode was assembled together by micro spot welding process and then the assembled electrodes were exposed to simulated glass beading temperatures of $700^{\circ}C,\;750^{\circ}C$ and $800^{\circ}C$. The microstructures of the microweld CCFL electrode were observed by using optical microscope, scanning electron microscope and EDS. Micro-tensile and microhardness test were also carried out. The results indicated that the grain coarsening in the HAZs(heat affected zones) for both the cup-pin weld and pin-lead wire were exhibited and the grain coarsening of the HAZ for the cup and the lead wire was more obvious than the HAZ of the pin. The micro-tensile test revealed that the fracture occurred at the cup-pin weld zone for all test conditions. The fracture surface could be classified into two parts such as pin portion and cup portion including weld nugget. The failure was seemed to be initiated from the boundary between nugget and pin through the weld joint. The result of the microhardness measurement exhibited that the relatively low hardness value, about 105HV was recorded at the HAZ of the cup. This value was about 50% less than that of the original value of the cup. The reduction of the microhardness was considered as the cause of the grain coarsening due to welding process. It was also appeared that there was no change in electric resistance for the standard electrodes and heat treated electrodes.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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• pp.441-443
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• 2005

According as CCFL(Cold Cathode Fluorescent lamp) of light source in Backlight unit for Note PC (Personal computer) is presently needed to low power consumption and long life time, the development focus of CCFL is going on the discharge gas, phosphor and electrode material. First of all, discharge voltage characteristic of CCFL is closely connected with electrode material For low discharge voltage, the characteristic of electrode material is needed to low work function, low sputtering ratio and superior manufacturing property. We developed new CCFL with Nb/Ni Clad electrode superior to conventional CCFL. Because Nb/Ni Clad electrode with Ni material and Nb material, the electrical characteristic is superior to other electrode materials. The electrode of Nb/Ni Clad is composed that Ni of outside material has superior manufacturing property and Nb of inside material has low work function. Nb/Ni Clad of new electrode material is made by process of Rolling mill at high pressure and heat treatment. We compared electrical characteristic of Nb/Ni clad electrode with conventional Mo electrode by measurement. Mo electrode and Nb/Ni Clad electrode of cup type with diameter 1.1 mm and length 3.0mm are used to this experiment. Material content of Mo electrode is Mo 100%. But, Nb/Ni Clad electrode is composed by content of Nb 40% and Ni 60%. The result of comparison measurement between new CCFL with Nb/Ni Clad electrode and conventional CCFL was appeared that CCFL with Nb/Ni Clad electrode had superior characteristic than conventional CCFL. As a result of experiment, we completed Note PC with low power consumption and long life time by application of new CCFL with Nb/Ni Clad electrode.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2007년 추계학술발표대회 개요집
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• pp.238-240
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• 2007

• 한국재료학회지
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• 제19권1호
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• pp.7-12
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• 2009

TFT-LCD is the most popular type of flat display panel in the information technology field. The back light unit is a main part of the structure of a TFT-LCD panel. Occasionally, studies have shown that failures of the CCFL of the BLU occur due to the poor weld characteristics of these materials. The aim of this study was to prepare some technical data and to characterize a microjoined electrode for the CCFL. Microstructure examinations, microhardness measurements, resistance measurements and microtensile tests of the microjoined electrode were carried out. The result indicates that a large amount of grain coarsening exists in the heat-affected zone (HAZ) of the weld between the cup and the pin. This grain coarsening of the HAZ between the cup and pin is caused by the welding cycle, which may have an influence on the lowest microhardness values. Fracturing of the microjoined electrode also occurred at the HAZ close to the cup between the weld holding the cup and the pin. Additionally, no specific changes of the electrical resistance among the cup, pin, and lead wire themselves or in the microjoined electrode were observed.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.34-34
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• 2007

최근, LCD-TV의 대형화가 경쟁적으로 진행되고 있으며 대형 BLU를 제작하기 위해서는 백라이트의 직경을 대구경 화하고, 또한 고화질을 이루기 위하여 휘도특성을 개선시켜야 한다. 통상적으로 백라이트에 사용되는 고압방전은 환경이 증가할수록 휘도가 저하하는 특성을 나타내므로 대화면 LCD-TV를 개발하는데 문제점을 갖고 있다. 또한, LCD-TV 백라이트로 가장 많이 사용하는 CCFL은 병렬로 구동할 수 없어 다수의 트랜스포머가 필요하여 전체적인 BLU가격을 상승시키는 요인이 되고 있어 병렬구동이 가능한 EEFL을 백라이트로 사용하고자 하는 노력이 진행되고 있으나 CCFL에 비하여 휘도가 낮아 사용이 제한되고 있는 상황이다. 본 연구에서는 고휘도의 병력구동이 가능한 새로운 EEFL을 개발하였으며, 그 특성을 분석한 결과 기존 EEFL에 비하여 40%이상의 광효율을 증가시키고, 대구경에서 CCFL보다 2배 기존의 EEFL에 비하여 3배 이상의 휘도를 증가시킬 수 있으며, 동시에 병렬구동이 가능한 고휘도 외부전극램프를 개발하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.835-837
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• 2002

The 17" Backlight Unit (BLU) employing twelve EEFLs (External Electrode Fluorescent Lamp) has been developed for LCD-TV The characteristics of the EEFL BLU without dual brightness enhancement film (DBEF) were equivalent to those of CCFL (Cold cathode Fluorescent Lamp) BLU employing eight CCFLs with DBEF. Luminance, power consumption and uniformity were 12,000nits, 32watt and 80%, respectively. The inverter of EEFL Backlight Unit is composed of 2 transformers and driven by the sinusoidal waveform.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.1058-1061
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• 2004

Recently, According to companies of TFT LCD are making large sized products more and more. In the vortex of Products with a monitor and LCD TV is applied in a technique of a high viewing angle(FFS, IPS, VA). Also, as a high luminance, high speed response time, high degree of a color purity, and so on are continuing to develop a high performance, it is necessary to improve a specific character of high luminance that apply to LCD TV as a LCD BLU. Because a LCD panel for TV usually has a lower resolution that compare to a monitor, the structure of present backlight system can't put out its power even though it has a merit in transmission. Therefore, the examination of improvement about the high luminance direct typed BLU for LCD TV that presupposes several uses of CCFL(Cold Cathode Fluorescent Lamp) or EEFL(External Electrode Fluorescent Lamp)is actively being progressed. Although it is necessary to increase the number of lamps for applying high performance by the direct type, in this case, because we can design the character of luminance for adoption of high performance. We can satisfy with a level of luminance for LCD TV. Accordingly, we analyzed a change of the number of CCFL, mechanical and optical character to produce the direct typed backlight in 32inches spec. Consequently, we achieved luminance of 6597nit,which was including polarization film, and secured the standard for LCD TV.