• Proceedings of the Optical Society of Korea Conference
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• 2009.02a
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• pp.225-226
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• 2009

본 연구에서는 마스크리스 노광장치의 두 프로젝션 광학계 사이에 있는 마이크로프리즘 어레이에 관한 연구이다. 마이크로프리즘의 원리와 종류에 대해 알아보고, 마이크로프리즘의 출사부의 모양에 따라 패턴의 모양이 변함을 확인하였다. 그리고 원하는 패턴을 만들 수 있는 마이크로프리즘을 설계하였다.

• Proceedings of the Optical Society of Korea Conference
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• 2008.02a
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• pp.265-266
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• 2008

본 논문은 기존 도광판에 복합화된 마이크로 패턴을 이용하여 휴대폰용 LCD Backlight Unit의 설계 및 해석에 대한 연구이다. 현재 상용 시제품의 도광판 패턴에 복합된 마이크로 패턴을 이용하여 광학시트를 줄이는 것을 목표로 진행 하였다. 도광판의 윗면에 프리즘형상을 설계 하였고, 아랫면은 기존의 패턴에 마이크로 패턴을 형성하였다. 마이크로 패턴의 형상은 구면, 프리즘, 실린더로 각 형상에 대해 변수를 바꾸어 가며 최적의 설계 값을 찾아보았다. 설계된 복합패턴으로 기존 Backlight Unit의 구성품인 반사판, 도광판, 확산판, BEF를 반사판과 도광판 만으로도 대체 할 수 있음을 시뮬레이션을 통해 확인하였다.

• Korean Journal of Optics and Photonics
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• v.21 no.2
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• pp.53-60
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• 2010

An integrated light guide plate (LGP) was designed for liquid crystal displays (LCD) without using prism and diffuser sheets. The integrated LGP is textured with micro-patterns on both the top and bottom surfaces. The textures effectively substitute for a single prism-sheet and a diffuser sheet in LCD displays without decreasing the brightness and uniformity. A LCD display with our integrated light guide is simulated to give average luminance of 4560 cd/$m^2$, luminance uniformity of 83% horizontal viewing angle $60^{\circ}$ and vertical viewing angle $56^{\circ}$. Therefore an ultra thin (slim) back light unit can be constructed with fewer optical sheets, which reduces the manufacturing cost and so improves price competitiveness.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.3
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• pp.1-6
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• 2018

Micro prism pattern is applying in order to get increase of luminance, control the light, and so forth especially in optics and display industry. Most patterns are fabricated by lithography, planning, and EDM, but they have limitations on the productivity or the unit cost of produce. However, ultra precision mold is one of the processes able to replace it, and assure high productivity required by industries. In this investigation, micro prismatic end-milling is suggested in order to fabricate the pattern effectively. Micro prism pattern having $100{\mu}m$ of pitch and height was machined on STD-11. After machining, the flank and boundary wear on micro end mill were measured and analyzed, as well as burr formation and dimensional accuracy of fabricated pattern were evaluated. Thus the optimal cutting conditions were derived.

• Proceedings of the KSME Conference
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• 2007.05a
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• pp.1537-1541
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• 2007

We injection molded a wedge type of plate with micro prizm patterns on its surface and investigated the fidelity of replication of the micro pattern depending on the process parameter such as mold temperature, melt temperature, injection rate or packing pressure. The size of the size of the $90^{\circ}$ prizm pattern is $50{\mu}m$ and the size of the plate is about 300㎜${\times}$200㎜. The thicknesses are 2.6㎜. and 0.7mm at each edge of the wedge type of plate. The fidelity of the replication turned out quite different according to the process parameters and location of the patterns on the plate. We measured the cavity pressure and temperature in real-time during the molding to analyze the effect of the local melt pressure and temperature on the micro pattern replication.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2008.11a
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• pp.729-730
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• 2008

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.407-408
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• 2009

• Proceedings of the Optical Society of Korea Conference
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• 2003.02a
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• pp.170-171
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• 2003

광도파로는 변조기, 스위치, 필터, 센서, 파장변환기 등 많은 분야에 응용이 되고 있다. 이러한 광도파로의 손실측정방법에는 프리즘 커플러를 이용하는 방법, fabry-perot 구조의 물질이 갖는 pyroelectric effect를 이용한 방법, 도파로의 입출력 단에 fiber를 커플링하여 측정하는 방법 등을 들 수 있다. 그러나, 프리즘 커플러를 이용한 방법은 미세패턴의 도파로 측정이 어렵고, pyroelectric effect를 이용하는 방법은 특정한 방향으로 도파되는 광의 측정이 불가능하며, 마지막으로 fiber 커플링 방법은 항상 같은 조건하에서의 손실 측정이 어려운 단점이 있다. (중략)

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.19 no.1
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• pp.34-39
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• 2005

We presented the method to obtain four speckle patterns with relative phase shift of ${\pi}/2$ by passive devices such as wave plate and polarizer, and calculate the phase at each point of the speckle pattern in shearography using Wollaston prism. And, we analyzed the phase error caused by wave plates used in the proposed method by Jones matrix.

• Proceedings of the Korean Society for Technology of Plasticity Conference
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• 2007.05a
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• pp.205-208
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• 2007

We injection molded a thin plate with micro prism patterns on its surface and investigated the fidelity of replication of the micro pattern depending on the process parameter such as mold temperature, injection rate or packing pressure. The size of the $90^{\circ}$ prism pattern is $50{\mu}m$ and the size of the plate is $400mm{\times}400mm$. The thickness is 1mm. The fidelity of the replication turned out quite different according to the process parameters and location of the patterns of the plate. We measured the cavity pressure and temperature in real-time during the molding to analyze the effect of the local melt pressure and temperature on the micro pattern replication.