• Title/Summary/Keyword: Hybrid aligned nematic

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Three-Terminal Hybrid-aligned Nematic Liquid Crystal Cell for Fast Turn-off Switching

  • Baek, Jong-In;Kim, Ki-Han;Kim, Jae-Chang;Yoon, Tae-Hoon
    • Journal of Information Display
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    • v.10 no.1
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    • pp.16-18
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    • 2009
  • A three-terminal hybrid-aligned nematic liquid crystal (3T-HAN LC) cell capable of fast turn-off switching is proposed in this paper. By employing the relaxation process initiated by an electric-field pulse, a fast turn-off time of less than 1 ms can be obtained through optically hidden relaxation. A low operating voltage and high transmittance were confirmed through simulations and experiments.

Surface Driven Switching in Liquid Crystal Displays

  • Komitov, Lachezar
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.14-16
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    • 2009
  • Surface driven switching of the liquid crystal bulk arising from the coupling between an applied electric field and a polarized state of a nematic liquid crystal, both localized at the substrate surface, is reported. Fast switching is demonstrated in a hybrid aligned nematic cell with a fringe electric field generated by comb-like electrode structure.

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Optical Configuration of a HAN Cell for Reflective Displays

  • Lee, Seo-Hern;Jang, Mi-Kyoung;Jeong, Jin-Kwan;Yoon, Tae-Hoon;Kim, Jae-Chang
    • Journal of Information Display
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    • v.4 no.2
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    • pp.25-28
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    • 2003
  • We propose a new optical configuration of a hybrid-aligned nematic liquid crystal cell for reflective displays, which consist of a biaxial film for obtaining wide viewing angle and a half-wave film for achieving high contrast. As a result, we can achieve wide viewing angle of (80( for the horizontal direction and (50( for the vertical direction and uniform reflection spectrum.

Characteristic confirm of Compensated Film Characteristics using Reactive Rod-like Mesogen in Twisted Nematic mode (TN mode에서의 Reactive Rod-like Mesogen을 이용한 보상필름의 특성 확인)

  • Jeon, Eun-Jeong;Kwon, Dong-Won;Kang, Byeong-Gyun;Lim, Young-Jin;Kim, Jong-Hoon;Seong, Hyeon-Jun;Lee, Myong-Hoon;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.271-272
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    • 2009
  • We fabricated a hybrid aligned film using reactive rod-like mesogen to reduce light leakage of twisted nematic(TN) cell in off-axis of the dark state. We proved that the fabricated compensation film has hybrid alignment by changing phase retardation according to polar angle. In this paper, we confirmed characteristics of compensation film through simulation results and found the matching factor of simulation results and experimental result. In result, the maximum pretilt angle of hybrid compensated film is $19^{\circ}$ which has phase retardation 0.1445.

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Viewing Angle Switching using Hybrid Aligned Nematic Liquid Crystal Display Driven by a Fringe-Field

  • Chin, Mi-Hyung;Jeong, Eun;Lim, Young-Jin;Kim, Jin-Ho;Srivastava, Anoop Kumar;Lee, Seung-Hee
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.1386-1389
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    • 2008
  • Conventional viewing angle switching electrode requires pixel division and additional liquid crystal panel. Hence the conventional viewing angle switching has low aperture ratio and high thickness. In this paper we proposed new viewing angle switching using hybrid aligned nematic mode by fringe-field electrode field (named HAN-FFS) with single liquid crystal panel. The fringe-field switching electrode is located at the bottom, and the additional common electrode is located at the top of the cell to control viewing angle. The proposed device is free from additional liquid crystal panel and pixel division. Consequently, the suggested structure has not only high aperture ratio but also show an excellent potential for viewing angle switching.

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Basic Principle for Determining Azimuthal Anchoring Strength by using HAN/TN Two Domain Liquid Crystal Cell

  • Tanaka, Norihiko;Kimura, Munehiro;Akahane, Tadashi
    • 한국정보디스플레이학회:학술대회논문집
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    • 2005.07a
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    • pp.324-327
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    • 2005
  • We propose a novel technique for evaluating the azimuthal anchoring strength of the alignment film on the nematic liquid crystal (LC). In our evaluation, a unique cell, which has two domain in one cell, was used; one is hybrid aligned nematic (HAN) region, the other is twsited nematic (TN) region (viz. HAN/TN two domain cell). From the comparison of director angles on the front substrate with each region, we are able to determine the angle between easy axis and real director axis on the front substrate. From this evaluation, the azimuthal anchoring strength was obtained accurately.

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Nanoparticles-induced Alignment in Liquid Crystal Cells

  • Jeng, Shie-Chang;Kuo, Chia-Wei;Lin, Yan-Rung;Wang, Hsing-Lung;Liao, Chi-Chang;Yang, Chen-Yu;Hwang, Shug-June
    • 한국정보디스플레이학회:학술대회논문집
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    • 2008.10a
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    • pp.1077-1079
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    • 2008
  • Nanoparticles-induced vertical alignment (NIVA) in the liquid crystal (LC) devices was observed and has been applied successfully on fabricating the hybrid-aligned nematic LC cells and guest-host LC cells. In this talk, we will discuss the characteristics of the electric and optical properties of NIVA-LC cells with different dopant concentrations and demonstrate that nanoparticles can be spin-coated on the substrate at a low temperature.

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Optical Configuration of a HAN Cell for Reflective Displays

  • Lee, Seo-Hern;Jang, Mi-Kyoung;Jeong, Jin-Kwan;Han, Kwan-Young;Yoon, Tae-Hoon;Kim, Jae-Chang
    • 한국정보디스플레이학회:학술대회논문집
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    • 2002.08a
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    • pp.957-960
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    • 2002
  • We propose an optical configuration of a hybrid-aligned nematic liquid crystal cell for reflective displays by which we can achieve wide viewing angle and uniform reflection spectrum.

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