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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.
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.
경사노광에 의한 3 차원 미세광학패턴 LCD-LGP 금형 개발
황철진(Chul Jin Hwang),김종선(Jong Sun Kim),고영배(Young Bae Ko),허영무(Young Moo Heo) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Light Guide Plate (LGP) of LCD-BLU(Back Light Unit) is manufactured by forming optical pattern with 5~100㎛ in diameter on the LGP by means of sand blasting or etching method. However, in order to improve the luminance of LCD-LGP, the design of optical pattern has introduced UV inclined-exposure process in this study. This micro-optical pattern, which has asymmetric elliptical column shaped pattern, can change low viewing-angle to high viewing-angle, as well as it contribute to diffusion of light. As a result, this type of micro-optical pattern can introduce the highly luminance. The PR structure obtained in the stage of lithography has asymmetric elliptical column shape and it is processed into a micro-optical pattern. Optical design with this kind of micro-optical pattern, mold fabrication by electroplating and LGP molding with injection molding are under way.
가공방법에 따른 소형 도광판용 광학패턴 금형의 표면특성연구
도영수,김종선,고영배,김종덕,윤경환,황철진,Do, Young-Soo,Kim, Jong-Sun,Go, Young-Bae,Kim, Jong Duck,Yoon, Kyung-Hwan,Hwang, Chul-Jin 한국금형공학회 2008 한국금형공학회지 Vol.2 No.4
Micro pattern is applied to the light guiding plate(LGP) to enhance the uniformity of the brightness of the LCD. The micro cones are molded in intaglio on the surface of the LGP. The surface roughness of each cone was 40nm and 38nm in negative and positive die for laser ablation. In chemical etching, the surface roughness was 25nm, 24nm in negative and positive. And the surface roughness of negative and positive dies were 4nm and 5nm for LIGA-reflow process.
밀도차를 가진 다상 층류 유동의 특성 연구와 마이크로 채널 내부 이중 미세 전극 가공에의 응용
백승호(Seung-Ho Paek),김종선(Jong Sun Kim),황철진(Chul Jin Hwang),최영기(Young Ki Choi),김동성(Dong Sung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this paper, we have carried out a characteristic study on multiphase laminar flow having different densities in a micro channel and it is applied to micro fabrication of dual opposite silver electrodes having each separated contact pad patterned on the top and bottom walls of a microchannel. The gravitational force due to the difference of densities of fluids causes the pressure mismatch at the interface between the fluids, thereby resulting in the rotation of the interface. In order to characterize the multiphase flow, the numerical simulations were extensively performed with commercial CFD package. We also proposed a new dimensionless relationship between dimensionless rotation angle of interface and dimensionless parameter combining geometrical effect and gravitational, viscous and inertia forces of the multiphase laminar flow in square microchannels. The dimensionless relationship, suggested in this study, is applied to a simple (alignment-free) and low-cost microfabrication technique of dual opposite silver electrodes inside microchannel.
이강현 ( Lee Kang-hyun ),이상래 ( Lee Sang-rae ),안철홍 ( Ahn Chul-hong ),황철진 ( Hwang Chul-jin ),김낙영 ( Kim Nak-young ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
고속도로 유지관리 중 시설물 안전관리가 차지하는 비중은 지속적으로 증가하는 추세로 이는 안전중심 기조, 관리노선 증가, 이상기후 등이 주된 원인이다. 비탈면 유지관리 분야에서도 점검 효율성 향상, 사각지대의 해소, 인력부족 해소 등에 대한 지속적인 니즈가 발생되어 이러한 한계를 극복하기 위한 스마트 기술의 유지관리 적용 필요성이 대두되는 실정이다. 이에 본 연구에서는 비탈면 유지관리 분야에서 4차 산협혁명과 연계된 스마트 기술의 접목 필요성에 대한 검토를 수행하였다.
이강현 ( Lee Kang-hyun ),이상래 ( Lee Sang-rae ),안철홍 ( Ahn Chul-hong ),황철진 ( Hwang Chul-jin ),김낙영 ( Kim Nak-young ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.1
고속도로 유지관리 중 시설물 안전관리가 차지하는 비중은 지속적으로 증가하는 추세로 이는 안전중심 기조, 관리노선 증가, 이상기후 등이 주된 원인이다. 비탈면 유지관리 분야에서도 점검 효율성 향상, 사각지대의 해소, 인력부족 해소 등에 대한 지속적인 니즈가 발생되어 이러한 한계를 극복하기 위한 스마트 기술의 유지관리 적용 필요성이 대두되는 실정이다. 이에 본 연구에서는 비탈면 유지관리 분야에서 4차 산협혁명과 연계된 스마트 기술의 접목 필요성에 대한 검토를 수행하였다.