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주영철,한충환,엄태준,이상욱,김국원,Joo, Young-Cheol,Han, Choong-Hwan,Um, Tai-Joon,Lee, Sang-Wook,Kim, Kug-Weon 한국반도체디스플레이기술학회 2007 반도체디스플레이기술학회지 Vol.6 No.4
Temperature distribution of the circular heat source was studied by analyzing the heat transfer of the environment of the circular source for OLED. Circular nozzle source was used to fabricate thin organic layer as the organic material in it was heated, vaporized and deposited to the large size panel. A modified heater structure of circular source has been suggested. The results of numerical analysis shows that the modified heater structure can use 15% more powder in a batch than the original heater structure does. Moreover, the modified heater structure can improve the uniformity of organic vapor deposition by controlling the temperature.
주영철(Youngcheol Joo),한충환(Choong Hwan Han),엄태준(Tai Joon Um),이상욱(Sang-Wook Lee),김국원(Kug Weon Kim),권계시(Kye-Si Kwon) 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.6
Organic light emitting diode(OLED) is one of the most promising type of future flat panel display. A linear source is used to deposite organic vapor to a large size OLEO substrate. An electric heater which is attached on the side of linear source heats the organic powder for the sublimation. The nozzle of heater, which is attached at the top of the linear source has an optimal temperature. An numerical analysis has been performed to find optimal heater position for the optimal nozzle temperature. A commercial CFD program, FLUENT, is used on the analysis. Two-dimensional and three-dimensional analysis have been performed. The analysis showed that the heater should be attached at the outer side of crucible wall rather than inner side of housing, which was original design. Eighteen milimeter from the top of the linear source was suggested as the optimal position of heater. Improving thermal performance of linear source not only helps the uniformity of organic vapor deposition on the substrate but also increase productibity of vapor deposition process.