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Direct writing 기법을 이용한 유기태양전지용 격벽 stamper 금형 제작 및 성형에 관한 연구
황철진,김종선,홍석관,오정길,강정진,Hwang, C.J.,Kim, J.S,Hong, S.K.,Oh, J.G.,Kang, J.J. 한국금형공학회 2008 한국금형공학회지 Vol.2 No.6
Polymer solar cells are a type of organic solar cell (also called plastic solar cell), or organic photovoltaic cell that produce electricity from sunlight using polymers. It is a relatively novel technology, they are being researched by universities, national laboratories and several companies around the world. In this paper, stamping mold of barrier ribs for polymer solar cells was manufactured by lithography and electroforming which can control the height of pattern and 80nl of barrier ribs was manufactured by using hot embossing.
사출성형 특성을 고려한 2인치 휴대폰용 도광판 금형제작에 관한 연구
황철진,도영수,김종선,민인기,김종덕,윤경환,Hwang, Chul-Jin,Do, Young-Soo,Kim, Jong-Sun,Min, In-Gi,Kim, Jong-Dug,Yoon, Kyung-Hwan 한국금형공학회 2008 한국금형공학회지 Vol.2 No.6
Recently, many researches have been done to improve optical performance of LCD-BLU(Back Light Unit). One of the most important parts in LCD-BLU is LGP(Light Guiding Plate). Micro-patterned LGP is known to have different optical characteristics depending on their shape, pattern density and size, etc. In the present study, a micro-optical patterned LGP mold was fabricated using LiGA process. The difference in the optical characteristics between positive and negative patterned LGP's was investigated by fixing the density, location and size of each pattern. It was found that the negative patterned LGP showed better optical characteristics than positive one.
박형 도광판의 음각, 양각 마이크로 패턴 성형성에 관한 연구
황철진,김종선,민인기,김종덕,윤경환,Hwang, Chul-Jin,Kim, Jong-Sun,Min, In-Gi,Kim, Jong-Dug,Yoon, Kyung-Hwan 한국금형공학회 2008 한국금형공학회지 Vol.2 No.5
LCD-BLU (Liquid Crystal Display - Back Light Unit) is one of kernel parts of LCD unit and it consists of several optical sheets(such as prism, diffuser and protector sheets), LCP (Light Guide Plate), light source (CCFL or LED) and mold frame. The LGP of LCD-BLU is usually manufactured by forming numerous dots with $50-200{\mu}m$ in diameter on it by erosion method. But the surface of the erosion dots of LGP is very rough due to the characteristics of the erosion process during the mold fabrication, so that its light loss is high along with the dispersion of light into the surface. Accordingly, there is a limit in raising the luminance of LCD-BLU. Especially, the negative and positive micro-lens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP.
음각, 양각 광학패턴 적용 휴대폰용 도광판 금형 제작 및 광특성 연구
황철진,김종선,강정진,홍석관,윤경환,Hwang, Chul Jin,Kim, Jong Sun,Kang, Jeong Jin,Hong, Seokkwan,Yoon, Kyung Hwan 한국금형공학회 2008 한국금형공학회지 Vol.2 No.2
A back light unit (BLU) is a key module of a thin film transistor liquid crystal display (TFT-LCD), frequently utilized in various mobile displays. In this study, we experimentally characterize transcription and optical properties of concave and convex microlens arrays (MLAs) of light guide plate (LGP) fabricated by injection molding with polycarbonate as a LGP substrate material. Nickel mold inserts were manufactured by electroforming on the MLA which was fabricated by the thermal reflow of photoresist microstructures patterned by UV-photolithography. For the case of convex microlens, the height of replicated microlens was less than that of the mold insert while maintaining almost the same microlens diameter of the mold insert as the location of the microlens is far from the gate. In contrast, for the concave microlens, the diameter of replicated microlens was larger than that of mold insert, while showing almost the same microlens height as the mold insert. From the optical examination of replicated convex and concave MLAs, it was found that a higher luminance of the LGP was achieved by the concave MLAs compared to the convex MLAs (about 30% enhancement in this case)due to the utilization of a larger amount of light provided by the light sources.