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유순재,김도형,최영석,김희태 한국정보디스플레이학회 2009 Journal of information display Vol.10 No.2
In this study, a very small LED packaging lead frame with a low thermal resistance was developed. The cost of the package process was reduced by the use of many small LED lamps, which increased the light emission efficiency. Compared to the large lead frame lamp, however, the optical property of the small LED packaging lead frame lamp was not sufficiently improved because its reflection structure was changed and its reflection area was reduced. The luminous efficiency of the LED lamp reaches 58 lm/W at the current density of 0.16 A/cm2. Using the LED lamps, 46-inch LCD BLU was manufactured. The BLU-made LED lamps have a low power consumption of 146 W and have a slim (10-mm-thick) BLU, keeping good uniformity in terms of brightness, and maintaining good thermal properties.
트랜스퍼 몰딩 방식을 이용한 고 색 균일성 특성을 가지는 백색 LED 램프
유순재,김도형,Yu, Soon-Jae,Kim, Do-Hyung 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.1
Compared to conventional molding technology, the color uniformity of light direction emitted from LED is improved with PCB type lead frame technology in which metal thin film is used and transfer molding technology which makes the density of phosphor uniform by manufacturing high density LED lamp. The light efficiency and the color uniformity of the LED are improved by molding the phosphor layer outside of chip and controlling the thickness of the phosphor layer. CIE x,y difference of LED in major axis is also improved uniformly from 0 to 90 degrees.
0.25 mm 초박형 두께를 가지는 회로기판형 리드프레임 백색 LED 램프
유순재,김도형,Yu, Soon-Jae,Kim, Do-Hyung 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.1
0.25 mm thickness super thin surface mounted device LED Lamp is developed with PCB type lead frame in which BT (Bismaleimide Triazine) resin is used. BT resin is removed by a laser beam in order to reduce the thermal resistance below $1\;^{\circ}C/W$ and transfer molding is used with silicone. Compared to conventional 0.4 mm thickness LED lamp, the developed LED lamp can be derived in high current and the luminance of the LED lamp is increased up to 240 mA.
Ionization of Helium Gas with a Tungsten Tip
김희태,유순재 한국정보디스플레이학회 2009 Journal of information display Vol.10 No.1
The ionization of a helium atom was investigated as a function of gas pressure, with the use of a tungsten tip. The tungsten tip, to which the external voltage was applied, was used to generate a constant electron current. The ionization current of helium gas was measured as a function of gas pressure. Effective ionization occurred in the pressure range of 0.5-20 torr when the distance between the field emission tip and the collector was 1 cm. The ionization current was linearly proportional to the voltage that was applied to the tungsten tip.
Numerical Calculation Study on Generalized Electron Emission Phenomenon
김희태,유순재 한국정보디스플레이학회 2009 Journal of information display Vol.10 No.4
There are two kinds of well-known electron emissions from metal: field and thermionic emission. For thermionic emission, electrons comeout of a metal due to the thermal energy, whereas for field emission, electrons tunnel out of a metal through the strong electric field. In this study, the most general electron emission caused by the temperature and electric field with a free electron gas model was considered. The total current density of electron emission comes from the field emission effect, where the electron energy is lower than vacuum, and from the thermionic-emission effect, where the electron energy is higher than vacuum. The total current density of electron emission is shown as a function of the temperature for a constant electric field, and as a function of the electric field for a constant temperature.
365 nm 파장대역 고투과율 실리콘 수지 TIR 렌즈 및 고지향성 노광기 광원모듈 제작
성준호,유순재,정미숙,Sung, Jun Ho,Yu, Soon Jae,Anil, Kawan,Jung, Mee Suk 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.4
A high directivity TIR (total internal reflection) lens in the UV-A region was designed using a silicone resin, and a UV light source module with a maximum irradiation density of $150mW/cm^2$ was fabricated. The beam angle of the TIR lens was designed to be $8.04^{\circ}$ and the maximum diameter of the TIR lens was Ø13.5. A silicone resin having a UV transmittance of 93% and a refractive index of 1.4 at a wavelength of 365 nm was used, and the lens was manufactured using an aluminum mold, from which silicone could be easily released. The module was fabricated in a metal printed circuit board of COB (chip on board) type using a $0.75{\times}0.75mm^2$ UV chip. A jig was used to adjust the focal length between lens and chip and to fix the position of the lens. The optical characteristics such as illumination distributions of the lens and module were designed using 'LightTools' optical simulation software. The heat dissipation system was designed to use a forced-air cooling method using a heat-sink and fan.
Detection of Pressure Waves in Water by Using Optical Techniques
김희태,유순재,조신호 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.4
The change in the transmision of light going through a liquid is expresed as a change in the presure in the liquid and the presure wave in the water is detected by measuring that change in the transmision of light. A piezo transducer is instaled on the botom of the water container to generate presure wave. The presure wave in the water is detected using a photodiode aligned with a laser beam going through the liquid. The photodiode detects intensity oscilations in the transmision light. Those oscilations are caused by a change in the refractive index due to density oscilations from the presure wave in the water. The oscilation amplitude of the detected light intensity increases linearly with the presure of the wave.