• 한국광학회:학술대회논문집
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• 한국광학회 1998년도 제15회 광학 및 양자전자 학술발표회 논문집
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• pp.222-223
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• 1998

• 한국광학회:학술대회논문집
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• 한국광학회 1999년도 제16회 광학 및 양자전자 학술발표회Proceedings of 16th Optics and Quantum Electronics Conference, 1999
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• pp.36-37
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• 1999

• 한국광학회:학술대회논문집
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• 한국광학회 1997년도 Advance Program of 14th optics andquantum Electronics conference, 1997제14 회 광학 및 양자전자 학술 발표회 논문 요약집
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• pp.19-19
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• 1997

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 동계학술발표회 논문집
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• pp.261-262
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• 2009

• 한국전기전자재료학회논문지
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• 제14권1호
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• pp.54-57
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• 2001

We have developed a new multidomain vertical-alignment (MVA) mode using a homeotropic photopolymer that provides a wider viewing angle for nematic liquidcrystal (NLC) with negative dielectric anisotropy. Good voltage-transmittance curves for he new MVA cell using the homeotropic photopolymer were observed. The viewing angle of the new MVA cell using the homeotropic photopolymer was wider than that of the conventional VA cell. The wide viewing angle using the new MVA cell is attributable to 4-domain by the ribs with UV exposure on the photopolymer.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 추계학술대회 논문집 전기물성,응용부문
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• pp.178-181
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• 2001

The electro-optical (EO) characteristics for the twisted-nematic (TN)-liquid crystal display (LCD) photo-aligned with polarized UV exposure on various blending photopolymer surfaces were investigated. Excellent LC alignment and voltage-transmittance (V-T) characteristics for TN-LCD photo-aligned with polarized UV exposure of normal incidence on the blending Photopolymer (polyimide (PI) + PM4Ch (poly(4-methacryloyloxy chalcone))) surface containing chalcone group can be achieved. The EO performances of the TN-LCD photo-aligned on the blending photopolymer can be improved due to the photosensitivity by long side chain of the photopolymer.

• 한국전기전자재료학회논문지
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• 제25권12호
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• pp.996-999
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• 2012

From UV irradiation, we achieved homeotropic liquid crystal alignment on blended photo-polymer layer which is composed of polyvinyl-cinnamate (PVCi) and homeotropic polyimide (PI). From vertical alignment (VA) mode, we measured threshold voltages by various PVCi doping concentration. Also, the rise time and fall time of VA cells were measured to verify the best doping concentration. Transmittance curves showed about 70% value between 380 nm and 780 nm wavelength which mean visible region.

• 한국광학회지
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• 제10권1호
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• pp.27-31
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• 1999

DuPont 社의 광폴리머를 홀로그램 기록매질로 사용하여, 반사형 LCD에 적용할수 있는 단색의 홀로그래픽 반사판을 설계 및 제작하였다. 홀로그램 동작파장을 514nm로 하여 기록함으로써, 녹색 영역에서 가장 밝은 이미지를 구현할 수 있었다. 이미지의 방행을 표면방사와 분이시킴으로써 높은 콘트라스트 미를 얻을수 있는데, 제작한 홀로그래픽 반사판을 TN-LC cell에 적용하여, 6:1의 on/off 콘트라스트 비를 얻었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.714-719
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• 2004

Controlling the cure depth of the Fa1260T photopolymer enhances the quality of a microstructure and minimizes its size in microstereolithography. In this work, variation of cure depth of the Fa1260T photopolymer is investigated while the concentration of a photopolymerization inhibitor as a radical quencher was varied. The energy source inducing photopolymerization was a He-Cd laser and a motorized stage controled the laser beam path accurately. The effects of process variables such as laser beam power and scan speed on the cure depth were examined. Optimum conditions for the minimum cure depth were determined as laser power of 230 W and scan speed of 40-50 m/s at the concentration of the radical quencher of 5％. The minimum cure depth at the optimal condition was 14 m. The feasibility of the fabrication of microstructures such as a microcup, microfunnel, and microgrid of 100 m size is demonstrated using Super IH process.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2000년도 추계학술대회논문집
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• pp.137-140
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• 2000

Synthesis of a new copoly (M4Ch-ChMA), copoly ((4-methacryloyloxy) chalcone-cholestery methacrylate), with chalconyl and cholesterol moiety characteristics for photoalignment materials was investigated. Good thermal stabilities of the synthesized copolymers are confirmed by thermogravimetric analysis (TGA) measurement. The pretilt angles of the nematic liquid crystal (NLC) are reduced as UV exposure time is increased on the copolymer surfaces. A pretilt angle of 81$^{\circ}$in NLC was observed with UV exposure of 3 min on the copolymer-3 surface. The NLCs pretilt angle is attributable to increased chalcone with increasing the UV exposure time.