• Title/Summary/Keyword: crystal alignment

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Texturing of YBa$_2Cu_3O_x$ thick film on MgO(001) single crystal (YBa$_2Cu_3O_x$ 후막의 단결정 MgO(001) 위에서의 배향화)

  • Kim, Eu-Gene;Kim, Myeong-Hui;Han, Young-Hee;Sung, Tae-Hyun;Kim, Sang-Joon;No, Kwang-Soo
    • 한국초전도학회:학술대회논문집
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    • v.9
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    • pp.271-274
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    • 1999
  • We are investigating epitaxially grown YBa$_2Cu_3O_x$(123) on MgO single crystal by partial melting process for high power application. After fabricating of BaCuO$_2$(011), Y$_2BaCuO_5$(211) powder, we made YBa$_2Cu_3O_x$(123) Paste with just mixing of (211), (011) and CuO(001) powders. Screen printing method was used to coat YBa$_2Cu_3O_x$(123) paste on MgO single crystal. To reduce the reaction in low temperature, rapid heating was conducted at partial melting temperature. The film was analysed with the difference of cooling-rate, thickness, reaction temperature by XRD, SEM, in-plane alignment, out-of-plane alignment, temperature-resistivity characteristics.

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Manufacturing a Single Cell Gap Transflective Liquid Crystal Display by Using Ink Jet Printing Technology

  • Sha, Y.A.;Su, P.J.;Hsieh, C.H.;Chang, K.H.;Chen, C.H.;Hsiao, C.C.;Shiu, J.W.;Fuh, S.Y.;Cheng, W.Y.;Liao, Y.C.;Yang, J-C;Lo, K.L.;Lee, D.W.;Lee, K.C.;Chang, Y.P.
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.1533-1536
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    • 2006
  • A novel single cell gap transflective liquid crystal display was developed. By using the ink jet printing technology, we fabricated a transflective liquid crystal display with the hybrid alignment in the reflective region and the homogeneous alignment in the transmission region. Compared with the traditional technologies, our technology provided the advantages of easy process, high yield, fast throughput, and less material usage. We also applied this technology to the 2.4 inch prototype. This panel could be implemented in the handheld product applications.

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Liquid Crystal Alignment Effect using in-situ Photoalignment on Flexible TN cell (In-situ 광배향법을 이용한 Flexible TN 셀의 액정배향 효과)

  • Nam, Ki-Hyung;Hwang, Jeoung-Yeon;Lee, Whee-Won;Choi, Myung-Gil;Suh, Dong-Hack;Kim, Young-Hwan;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.11a
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    • pp.506-509
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    • 2004
  • We have investigated the generation of pretilt angle for a nematic liquid crystal (NLC) alignment with in-situ photoalignment method on polyimide (PI) surfaces using thin plastic substrates. The LC aligning capabilities and pretilt angle of the thin plastic substrates by in-situ photoalignment method were better than that of the glass substrate by general photoalignment. Also, the LC pretilt angle increased with increasing heating temperature and exposure time. And EO characteristics of photoaligned TN-LCDs using in-situ photodissociation method on glass substrate and on plastic substrate are also excellent.

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How Do Liquid Crystal Molecules Align on Treated Surfaces?

  • Okada, Yoshinori;Shioda, Tatsutoshi;Chung, Doo-Han;Park, Byoung-Choo;Takezoe, Hideo
    • Journal of Information Display
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    • v.4 no.2
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    • pp.29-34
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    • 2003
  • We have studied liquid crystal (LC) molecular alignment on rubbed and photoaligned surfaces. Particular attention was paid to the intermolecular liquid crystalline interaction. We will first show that uniform molecular orientation on a rubbed surface does not mean spatially uniform interaction between the surface and LC molecules. Rather LCs tend to align themselves through LC interaction. The existence of nonuniformity of rubbing was successfully visualized by double surface treatment. The importance of intermolecular LC interaction was also found in the orientation formation process in 5CB evaporated on rubbed and photoaligned surfaces. By simultaneously analyzing polarized UVNIS absorption and second-harmonic generation (SHG) using the maximum entropy method, we succeeded in obtaining the temporal variation of the orientational distribution functions in the film forming process. The distribution anisotropy and pretilt are found to be generated under the influence of intermolecular LC interaction.

EO performance of TN cell on the inorganic films surface using DuoPIGatron ion source on NDLC thin film (무기박막표면에 DuoPIGatron 이온소스를 이용한 TN-LCD 셀의 전기광학 특성)

  • Kim, Byoung-Yong;Hwang, Jeoung-Yeon;Kim, Sang-Hun;Han, Jung-Min;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2006.06a
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    • pp.432-433
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    • 2006
  • Electro-optical (EO) characteristics of twisted nematic (TN) - liquid crystal display (LCD) on the NDLC thin film using obliquely ion beam (IB) exposure as new ion beam (IB) type system (DuoPIGatrion ion source). A good uniform alignment of the nematic liquid crystal (NLC) alignment with the ion beam exposure on the NDLC thin film was observed. In addition, it can be achieved the good EO properties of the ion-beam-aligned TN-cell on polyimide surface ; the stable VT curve in the ion-beam-aligned TN cell on the NDLC thin film with ion beam exposure using new type IB equipment was obtained. and the fast response time in the ion-beam-aligned TN cell on the NDLC thin film with ion beam exposure using new type IB equipment was obtained.

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New MVA Cell Using a Homeotropic Photopolymer (수직 광폴리머를 이용한 새로운 MVA 셀)

  • 황정연;서대식
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.14 no.1
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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.

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Long period application of AC field causing contrast reduction of IPS cell

  • Momoi, Yuichi;Koda, Tomonori
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.870-872
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    • 2008
  • It is known that AC electric field to drive IPS mode of liquid crystal display (LCD) causes reduction of the contrast after long period of display operation. Our results are presented in this paper on a base of a model of interaction between surface of PI alignment film and LC molecules. We conclude that the surface viscosity of PI alignment film is one of the most important factors for the contrast reduction phenomenon.

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The study of thick cell gap on the alignment of a ferroelectric liquid crystal cell

  • Wu, Jin-Jei;Wu, Po-Chang;Sie, Fu-Cheng
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.862-863
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    • 2006
  • According to the experiment results, the alignment of FLC cell can become more uniform at thick cell gap by adjusting the amplitude of the aligned AC electric field which is applying to the FLC cell during $N^{\ast}-SmC^{\ast}$ phase transition. If the amplitude of AC electric field is high enough, the FLC molecules forced with the amplitude and aligned to a particular direction.

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EO Performances of the Ion Beam Aligned TN-LCD on a Carbon Nitride Thin Film Surface

  • Park, Chang-Joon;Hwang, Jeoung-Yeon;Kang, Hyung-Ku;Seo, Dae-Shik;Ahn, Han-Jin;Kim, Jong-Bok;Kim, Kyung-Chan;Baik, Hong-Koo
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.1121-1124
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    • 2004
  • Carbon Nitride exhibits high electrical resistivity and thermal conductivity that are similar to the properties shown by diamond-like carbon (DLC) films. These diamond-like transport properties in Carbon Nitride come in a material consisting of $sp^2$-bonded carbon versus the $sp^3$-carbon of DLC. The diamond-like properties and nondiamond-like bonding make NDLC an attractive candidate for applications. Liquid crystal (LC) alignment capabilities with ion beam exposure on carbon nitride thin films and Electro-Optical (EO) performances of the ion-beam aligned twisted nematic liquid crystal display (TN-LCD) with oblique ion beam exposure on the Carbon Nitride thin film surface were studied. An excellent uniform alignment of the nematic liquid crystal (NLC) alignment with the ion beam exposure on the Carbon Nitride thin films was observed. In addition, the good EO properties of the ion-beam-aligned TN-LCD were achieved. Finally, we achieved the residual DC property of the ion-beam- aligned TN-LCD on the Carbon Nitride thin film.

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LC Aligning Capabilities of a Nematic Liquid Crystal on Homeotropic Polyimide Surface by New Ion-beam Irradiation

  • Ok, Chul-Ho;Kang, Dong-Hun;Lee, Kang-Min;Han, Jin-Woo;Kim, Byoung-Yong;Oh, Byeong-Yun;Kim, Young-Hwan;Hwang, Jeong-Yeon;Lee, Sang-Keuk;Han, Jeong-Min;Seo, Dae-Shik
    • Transactions on Electrical and Electronic Materials
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    • v.8 no.6
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    • pp.265-267
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    • 2007
  • The liquid crystal(LC) aligning capabilities of a nematic liquid crystal(NLC) on a homeotropic polyimide(PI) surface using a new ion-beam method were studied. Exposure ion-beam of $45^{\circ}$ incidence angle shows a good LC alignment of the NLC on the homeotropic PI surface. Also, on the homeotropic PI surface, the tilt angle of the NLC by exposure ion-beam of $45^{\circ}$ incidence angle had a tendency to decrease as increased ion-beam energy density. And, on the homeotropic PI surface, the alignment character of the NLC with respect to ion-beam energy was good at 1500 eV. And we achieved satisfactory result for EO character.