• Title/Summary/Keyword: vertical alignment

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Study on electro optic characteristic of pattern free vertical alignment (PFVA) mode using the uv curable reactive mesogen (RM) (광경화성 단분자를 이용한 pattern free vertical alignment 모드의 전기 광학 특성 연구)

  • Cho, In-Young;Hwang, Seong-Jin;Kim, Sung-Min;Hwang, Ji-Hye;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.04a
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    • pp.45-46
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    • 2008
  • The conventional biased vertical alignment (BVA) mode has several advantages such as rubbing- and protrusion-free, wide-viewing angle and stable LC dynamics against external pressure. However manufacturing process of BVA mode is difficult task because the pixel and bias electrode signal are different in each frame. To solve this problem, we investigated the pattern free vertical alignment (PFVA) by using the UV-curable reactive mesogen (RM), in which the LC molecules were made to be pre-tilted. Eventually transmittance and response time in PFVA mode were found to be improved as compared to BVA mode.

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Development of Vertical Alignment System for Manufacturing AMOLED TV

  • Lee, Yoon-Seok;Han, Seok-Yoon;Lee, Nam-Hoon;Choi, Jeong-Og
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.1393-1398
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    • 2009
  • We once have announced that we developed a horizontal large-area alignment system with an alignment accuracy of < ${\pm}3{\mu}m$ and an alignment time of < 30 seconds, a core process module for RGB direct pattering by using a fine metal mask, which can process a Gen 4 ($730{\times}920mm^2$) substrate for high resolution OLED products. In this article, we presents a brand-new vertical alignment system for a even larger substrate of Gen 5 and beyond which can provide a better alignment accuracy and a higher throughput. The newly developed system exhibits an alignment accuracy of < ${\pm}2{\mu}m$ and an alignment time of < 20 seconds which, we believe, can open a new era for manufacturing large-size OLED monitors and TVs.

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Homeotropic liquid crystal cell without vertical alignment layers

  • Jeng, Shie-Chang;Wang, Hsing-Lung;Kuo, Chia-Wei;Lin, Yan-Rung;Liao, Chi-Chang
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08a
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    • pp.496-498
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    • 2007
  • This paper reports our observation that the addition of nanoparticles in the negative dielectric anisotropic liquid crystal (LC) cell can exhibit the properties of vertical alignment without using alignment layers. The electro-optical properties of this nanoparticles-induced vertical alignment in the LC cell are very similar to the conventional homeotropic LC cell with alignment layers. This technique can be used to fabricate a flexible LC display demanding low temperature process

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LCD Glass strain Simulation For Large Size Imprint Equipment (대면적 임프린트 장비를 위한 LCD Glass 변형 시뮬레이션 연구)

  • Song, Young-Joong;Shin, Dong-Hoon;Im, Hong-Jae;Jang, Si-Yeol;Lee, Kee-Sung;Jeong, Jay-Il
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.1626-1631
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    • 2007
  • The purpose of the study is to simulate the displacement of the LCD glass during process of a large size imprint. During this process, a small temperature variation makes thermal stress, which causes the horizontal variation of mold and glass. During alignment process to fix the LCD glass on a alignment stage, the vertical displacement is made by the absorption pressure and the shear stress. This study simulates the horizontal displacement of mold and glass due to temperature variation, the vertical displacement depending on the shape of absorption surface fixing the LCD glass in the alignment process, and the horizontal and vertical displacement which occurs in the LCD glass at the alignment process. Algor which is a FEM code for a framework simulation was applied. Temperature variation above ${\pm}$ $0.1^{\circ}C$ on mold and glass causes the horizontal displacement of 150nm due to thermal expansion. The vertical displacement due to the circular is ten times of the case of rectangular absorption nozzle. The displacement of the LCD glass in the alignment process is about 49nm.

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Building of Efficient Route Alignment Information using GSIS -Focused on plan and vertical alignment- (GSIS를 이용한 효율적 도로선형 정보의 구축 - 평면 및 종단선형을 중심으로 -)

  • 강상구;정영동
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.18 no.4
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    • pp.325-333
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    • 2000
  • This paper deals with real time building of route and vertical alignment information system for the efficient and scientific management using GSIS. First, we redesigned route and vertical alignment for obtained basic data using road projector(road design main software). Using by these acquired result, we made a database on road plan and vertical alignment drawing as a basic information being used to construction of road complex information system. The main objectives in this study are the rational maintenance road planing for drawings, its database and the systematization of route information management through the fast updating, mending, supplement. Result of this study enables us to manage route information.

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Symmetric-viewing liquid crystal display with alternating alignment layers in an inverse-twisted-nematic configuration

  • Na, Jun-Hee;Li, Hongmei;Park, Seung-Chul;Lee, Sin-Doo
    • Journal of Information Display
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    • v.12 no.4
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    • pp.191-194
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    • 2011
  • A symmetric-viewing inverse-twisted-nematic (ITN) liquid crystal display (LCD) with alternating alignment layers was developed using a stamping-assisted rubbing (SAR) technique. A patterned layer of a fluorinated acrylate polymer was transferred onto the first rubbed vertical-alignment layer prepared on a substrate by stamping. The fluorinated acrylate polymer provided a protective layer covering the first rubbed alignment layer during the second rubbing process, which promoted the vertical alignment of the LC molecules. The LC cell in the ITN geometry with two orthogonally rubbed alignment layers showed symmetric-viewing characteristics with fourfold symmetry. The SAR technique was shown to be a mask-free alignment method of producing multidomains for symmetric-viewing LCDs.

EO Characteristics in the Multidomain Vertical-Alignment (MVA) Cell on a Homeotropic Photopolymer (수직 광폴리머를 이용한 MVA 셀의 전기 광학 특성)

  • Lee, Kyung-Jun;Hwang, Jeoung-Yeon;Kim, Jae-Hyung;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.953-956
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    • 2002
  • The electro-optical (EO) performances of a multidomain vertical-alignment (MVA) cell on a homeotropic photopolymer have been investigated. In the absence of an electric field, the MVA cell achieved black state as LC alignment is homeotropic. An electric field created by interdigitated electrodes and rib made after photolithograph using the photopolymer on both substrates causes a director deformation of a multidomain type. Good voltage-transmittance curves for a MVA cell on the homeotropic photopolymer were observed. Also, the stable response time of MVA cell on the homeotropic photopolymer can be achieved.

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EO Characteristics of the Mew MVA-LCD using a Crossed Stripe Grating-Groove Vertical Alignment (CGVA) Layer

  • Lee, Kyung-Jun;Hwang, Jeoung-Yeon;Lee, Sang-Keuk;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.999-1002
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    • 2003
  • Electrooptical (EO) characteristics of a new multidomain vertical-alignment (MVA) liquid crystal display (LCD) with negative dielectric anisotropy on a homeotropic photopolymer were studied. Good voltage-transmittance (V-T) curves of the new MVA-LCD on the homeotropic photopolymer were obtained. Also, the stable response time of the new MVA-LCD on the homeotropic photopolymer was achieved. The viewing angle of the new MVA-LCD could be improved by a crossed stripe grating-groove surface as the alignment layer using a photolithograph method on the photopolymer.

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Electro-optical properties of photo-aligned VA-LCD by irradiation of unpolarized UV light. (비편광 UV조사에 의한 광배향 VA-LCD의 전기광학특성)

  • 박두석;서대식
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1999.11a
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    • pp.545-548
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    • 1999
  • The electro-optical characteristics of photo-aligned vertical-alignment (VA)-liquid crystal display (LCD) with non-polarized ultraviolet (UV) light irradiation of 45\`on homeotropic polyimide (Pl) surface were investigated. LC alignment on photo-aligned VA-LCD is attributed to photo-depolymerized reaction of the polymer with non-polarized UV light irradiation on PI surface. We had good voltage-transmittance (V-T) characteristics of photo-aligned VA-LCD. The response time of photo-aligned VA-LCD was slower than that of the rubbing-aligned VA-LCD. Finally, we suggest that the slow response time of photo-aligned VA-LCD depends on the LC domain.

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A Study on the Development of Automatic Measuring System on the Alignment Offset of the Vertical Multistage Shaft (수직형 다단축의 축 정열 오프셋 자동 측정시스템 개발)

  • Park, H.C.;Kim, M.Y.;Lee, H.
    • Journal of KSNVE
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    • v.8 no.5
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    • pp.922-928
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    • 1998
  • This paper presents the automatic alignment measuring system for improving the accuracy and working time of alignment of large vertical hydraulic pump turbine. It is general practice that rotating shaft should run within acceptable vibration limit. In order to obtain better run-out data of multi-stage rotor, careful and accurate alignment approach must be established. Generally, present alignment procedure are required several iterative works and so many manpower. Therefore, the new system has been developed using a vector calculation algorithm, laser sensor and data acquisition devices. As a result of appling to actual machines, it is confirmed that manpower is saved up to an average 90%.

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