• Title/Summary/Keyword: Liquid Crystal Display (LCD)

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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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    • 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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The Measurement of Vacuum Pressure for the Rotors of Disk-type Molecular drag Pumps (원판형 분자 드래그펌프 회전자에 대한 압력 측정)

  • Kwon, Myoung-Keun;Kim, Do-Haeng;Hwang, Young-Kyu
    • Proceedings of the KSME Conference
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    • pp.2725-2730
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    • 2007
  • Turbo-type molecular drag pumps ( MDPs ) are used in the liquid crystal display ( LCD ), semiconductor and other thin film industries. Siegbahn ( disk-type ) molecular drag pumps are used as high-pressure stages in the hybrid-type turbomolecular pumps, where they can operate in the viscous, the transition and the free molecular flow regime. In this study is performed to investigate the pumping characteristics of three-stage disk-type molecular drag pump ( DTDP ) in the molecular transition flow region. The experiments are measured using five vacuum pressure gauges in the positions for rotors of DTDP. The test is performed with nitrogen gas ( $N_2$ ).

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Synthesis and characterization of photoreactive prepolymers bearing cyclic moiety (Epoxy resin을 이용한 cyclic moiety가 포함된 고내열 감광성 prepolymer의 합성 및 특성연구)

  • 이성범;이명섭;임현순;강태수;김환건;이준영
    • Proceedings of the Korean Fiber Society Conference
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    • pp.44-47
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    • 2003
  • 21C 고도정보화 시대를 맞이하여 평판표시소자에 대한 요구가 급증하여 현재는 액정표시소자 (Liquid Crystal Display, LCD)가 가장 널리 사용되고 있는데, 특히 해상도가 우수한 TFT(Thin Film Transistor)-LCD에 대한 수요가 급증하고 있다. Full color TFT-LCD를 구성하는 재료 중 가장 높은 비중을 차지하고 있는 것이 color filter이며, 이것을 제조하는 데 있어 가장 중요한 기술은 화소 형성기술이다. 특히 가격은 고가이지만 해상성이 뛰어난 TFT-LCD에 주로 사용되는 안료분산법은 신뢰성, 특히 내열성 및 공정의 복잡성 등 문제점을 가지고 있다[1]. (중략)

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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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    • 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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A New Approach to Estimating Product Lifetimes: A Case Study of an LED Based LCD TV

  • Kim, Keun-Hwan;Kim, Chi-Hwan;Park, Hyun-Woo
    • Asian Journal of Innovation and Policy
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    • v.1 no.2
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    • pp.200-218
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    • 2012
  • Estimating the economic life of a technology is the first important prerequisite step in the feasibility analysis of technology-based business. Many empirical studies have concentrated on patents data to estimate the time period for a technology. However, it is recommended to estimate it along with qualitative considerations of future technological and market conditions. In this regard, little is known about how approaches are applied. This paper aims to establish a structural framework of estimating the lifetime of a technology by integrating the outputs of an analysis of the determinants in each transition of a product life cycle. We describe an illustrative case about a light emitting diode (LED) backlight unit (BLU) technology for the liquid crystal display (LCD) TV. The framework allows valuators and experts to estimate a technology lifetime by using multidimensional factors.

PDMS기판에 이온빔 처리에 따른 수평 액정의 배향 연구

  • Kim, Yeong-Hwan;O, Byeong-Yun;Kim, Byeong-Yong;Lee, Won-Gyu;Im, Ji-Hun;Na, Hyeon-Jae;Seo, Dae-Sik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.159-159
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    • 2009
  • We characterize a flexible self-assembled liquid crystal display (LCD) fabricated from a polyimide (PI) alignment layer with polydimethylsiloxane pixel walls. Ion beam (IB) irradiation aligned LC molecules in the PI layer and bonded two flexible plastic substrates in a one-step assembly of the pixel walls. X-ray photoelectron spectroscopic analysis, Fourier transform infrared spectroscopy, and scanning electron microscopy provided chemical and physical evidence for the formation of stable chemical bonds between the PI layer and the PDMS pixel walls in addition to the important maintenance of a uniform 6 um gap between the two substrates without the use of any epoxy resins or other polymers.

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전 시야각영역에서 시야각 조절이 가능한 액정 디스플레이

  • Heo, Jeong-Hwa;Kim, Jin-Ho;Im, Yeong-Jin;Park, Gyeong-Ho;Lee, Jeong-Ho;Kim, Yeong-Gu;Lee, Seung-Hui
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.163-163
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    • 2009
  • Viewing angle controllable liquid crystal display (LCD) associated with fringe-field switching (FFS) mode with high image quality is proposed. In the device, one pixel is composed of main and sub pixels, in which adjacent sub pixel is patterned with pixel electrodes direction orthogonal to the adjacent one. In this way, light leakage can be generated in the all viewing angle directions except the normal direction, realizing view angle controllable LCD in both horizontal and vertical directions.

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Trends on Display Technology and Standardization (디스플레이 기술 및 표준화 동향)

  • Ahn, S.D.;Kang, S.Y.;Cho, S.H.
    • Electronics and Telecommunications Trends
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    • v.30 no.6
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    • pp.1-11
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    • 2015
  • 최근 디스플레이 산업은 Liquid Crystal Display(LCD)산업의 성숙 및 동북아 선도업체를 중심으로 과점화 양상에 따라, 국가 간 주도권 경쟁을 위한 경쟁 치열해지고 있으며, 디스플레이 시장정체 극복 및 경쟁국 간의 기술시장의 우위를 선점하기 위하여 차세대 디스플레이 개발을 추진하고 있다. 차세대 디스플레이는 기능이 다양화 된 디스플레이, Active Matrix Organic Light Emitting Diode(AMOLED), 플렉서블 디스플레이, 투명 디스플레이와 같은 새로운 디스플레이 및 자동차 교육, 광고 의료 분야와 융합되는 신시장 창출형 융합 디스플레이로 발전하고 있다. 본고에서는 차세대 디스플레이의 최근 기술동향 및 디스플레이 국제 표준 기술동향 및 이슈를 살펴보고자 한다.

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A Study on an Inspection System of Repeated Pattern in PDP panel

  • Jung, Ji-Hun;Nam, Sang-woon;Hwang, Yong-Ha;Park, Yong-June;Kang, Tea-Kyu;Jeong, Dea-Hwa
    • 제어로봇시스템학회:학술대회논문집
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    • pp.126-131
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    • 2004
  • The popularity of flat-panel display(FPD), including plasma display panel(PDP) and liquid-crystal display(LCD), has given rise to the need to streamline their production. In these days, PDP is one of the most popular display devices because of its expansion of manufacturing process and simplicity. Bus electrodes, sustain electrodes, barrier ribs and RGB phosphors are patterned on PDP panel to display an image. Since a minute damage on the pattern can cause a serious defect to display, it is important to inspect the pattern precisely. In this paper, an automatic inspection system of repeated pattern in PDP panel has been introduced to find the defect, such as open, short, dirt, island, and so on. And the inspection system has been operated in the mass production line of PDP.

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A Single Gap Transflective Display associated with In-Plane Switching Mode

  • Song, Je-Hoon;Lim, Young-Jin;Lee, Seung-Hee
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1179-1181
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    • 2004
  • We have studied a single gap transflective liquid crystal display (LCD) associated with in-plane switching (IPS) mode. In the transmissive IPS cell, the transmittance of electrodes and above electrodes is different, that is, the degree of rotation of the LC director between electrodes and above electrodes is 45 $^{\circ}$ and 22.5 $^{\circ}$ , respectively. Utilizing the different rotating angle of the LC director and in-cell retarder with a quarter-wave plate used below the LC layer, the IPS transflective LCD is realized such that the area between electrodes is used as a transmissive part and the area above electrodes is used as a reflective part.

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