• Title/Summary/Keyword: 배향

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Study on of polarity effect on alignment film in transcription-aligned TN-LCD (전사배향 TN-LCD 에서의 배향막의 극성효과에 관한 연구)

  • Kim, Jin-Ho;Seo, Dae-Shik
    • Proceedings of the KIEE Conference
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    • 1999.07d
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    • pp.1812-1814
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    • 1999
  • The effects of polarity of the polymer on transcription-aligned twisted nematic (TN)-liquid crystal display (LCD) on various the polyimide (PI) surfaces were investigated. The monodomain alignment of nematic (N)LC is obtained in cells fabricated by transcription alignment method on PI surface with medium polarity. The LC alignment using transcription alignment method is attributed to polarity of the polymer. The threshold voltage of transcription-aligned TN-LCD decreases with increasing the polarity of the polymer on three kinds of the PI surfaces. The threshold voltage of transcription-aligned TN-LCD on PI surface with high polarity is almost the same compared to rubbing-aligned TN-LCD. The response time of transcription-aligned TN-LCD decreases with the increasing the polarity of the polymer on all PI surfaces. The decay time of transcription-aligned TN-LCD is slow compared with the rubbing-aligned TN-LCD.

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Liquid Crystal Aligning Capabilities in the Photoaligned TN-Cell on Blending Photopolymer (복합 광폴리머 표면을 이용한 장배향 TN 셀의 액정배향 특성)

  • Hwang, Jeoung-Yeon;Jo, Yong-Min;Seo, Dae-Shik;Suh, Dong-Hack
    • Proceedings of the KIEE Conference
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    • 2001.11a
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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.

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Epitaxially Grown $TiO_2$ Nanostructures for Efficient Water Splitting Devices

  • Yu, Eun-Sang;Kim, Eung-Gyu;Jeong, Hyeon-Seok
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.08a
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    • pp.183-183
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    • 2012
  • 최근 환경오염과 천연자원의 고갈로 태양광을 이용한 수소와 산소를 제조하는 광전기화학적 물분해 반응이 많은 관심을 받고 있다. 본 연구에서는 란타늄 알루미네이트 단결정 기판 위에 니오븀을 도핑한 이산화 티타늄을 증착 시킨 후 two-step sol-gel법을 이용하여 아나타제 이산화티탄늄 나노막대를 성장시켰다. 성장시킨 아나타제 티타늄산화 막대는 구조적인 특징과 모양, 크기를 전구체 용액의 수소이온화지수(pH)를 조절함으로써 변화 시킬 수 있다. 니오븀을 도핑한 이산화 티타늄 기판 위에 높은 수소이온화지수(pH 10 이상)을 이용하여 우선 배향된 아나타제 나노 막대를 성장 시킬 수 있으며, 주사전자현고해상도 투과전자현미경, x선 회절 분석기를 통해 구조적 특성을 평가하였다. 또한 수소이온화지수를 조절(pH 9)하여 만든 다결정질 아나타제 나노구형과 우선배향된 나노막대의 전하이동특성을 분석하기 위하여 기체 색층분석법(GC), 광전기화학법(PEC), 임피던스를 측정하였다.

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Study of Homeotropic Liquid Crystal Characteristics Using Photo-polymer and Homeotropic Polyimide Blended Alignment Layer via UV Irradiation Method (UV 광배향법을 통한 광폴리머와 수직 폴리이미드 혼합 배향막의 수직 배향 특성 연구)

  • Lee, Jin-Woo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.12
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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.

Effect of Mold Temperature on the Separation and the Orientation during Compression Molding of Fiber-Reinforced Polymeric Composites (섬유강화 고분자 복합재료의 압축성형에 있어서 분리 ${\cdot}$ 배향에 미치는 금형온도의 영향)

  • Lee, Dong-Gi;Han, Gil-Young;Kim, E-Gon
    • Journal of Ocean Engineering and Technology
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    • v.9 no.2
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    • pp.123-132
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    • 1995
  • During compression molding of fiber-reinforced polymeric composites, microstructural changes such as the fiber-matrix separation and the fiber orientation are occurred by the flow of composite materials. Since the nonhomogeneity and anisotropy of composites are caused by the separation and orientation of fibers. On the other hand, the separation and the orientation of fibers are inseparably related to each other. In this paper the degree of nonhomogeneity which is a measure of the separation is obtained using one-dimensional rectangular shaped part compression molding. And the orientation function is measured by the image processing using soft X-rayed photograph and image scanner. We study effects of the mold temperature on the degree of nonhomogeneity and the orientation function.

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