• Title, Summary, Keyword: Fringe field switching

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Electro-Optic Characteristics according to Distance between Pixel Electrodes in Fringe In-plane field Switching mode (화소 전극 간 거리가 Fringe In-plane field Switching mode의 전기 광학 특성에 미치는 영향)

  • Kim, Min-Su;Park, Ji-Woong;Jung, Jun-Ho;Ha, Kyung-Su;Lim, Young-Jin;Lee, Myong-Hoon;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.337-338
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    • 2008
  • We have studied electro-optic characteristics of a high performance liquid crystal display using Fringe In-plane field Switching (FIS) mode. The strong electric fields cause more liquid crystals to reorient almost in plane above and between the pixel electrodes. As a result, the operation voltage is lower and transmittance is higher than those of Fringe Field Switching (FFS) and In-Plane Switching (IPS) modes. Apparently, the transmittance depends on voltage applied at the configurations of FIS mode which are proposed. Therefore, we have studied certain length of between electrodes for maximum transmittance and light intensity.

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Study on Electro-optic Characteristics of Fringe-field Switching Twisted Nematic Mode using a Liquid Crystal with Negative Dielectric Anisotropy (유전율 이방성이 음인 액정을 이용한 Fringe-field Switching Twisted Hematic 모드의 전기광학 특성 연구)

  • 송일섭;신성식;이종문;이승희
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.5
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    • pp.530-535
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    • 2004
  • We have studied 90$^{\circ}$ twisted nematic mode switching by fringe electric field(F-TN mode) using a liquid crystal (LC) with negative dielectric anisotropy. In the device, two polarizers are parallel each other, electrodes exist only on bottom substrate, and one of rubbing direction is coincident with polarizer axis. Therefore, the cell shows a black state before a voltage is applied. With a bias voltage generating fringe-electric field, the LC twists perpendicular to fringe electric field such that the LCs are almost homogeneously aligned except near the bottom surface since the negative type of the LC is used. Consequently, the new device exhibits much wider viewing angle than that of the conventional TN mode due to in-plane switching and relatively high transmittance since the LC director above whole electrode area aligns parallel to the polarizer axis.

A High Quality Fringe-Field Switching Display for Transmissive and Reflective Types

  • Lee, Seung-Hee;Hong, Seung-Ho;Jeong, Yeon-Hak;Kim, Hyang-Yul
    • Journal of Information Display
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    • v.1 no.1
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    • pp.9-13
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    • 2000
  • In liquid crystal displays, the display mode that represents initial liquid crystal alignment and method of applying voltage, mainly determines the image quality of display. Recently we have developed the fringe-field switching (FFS) mode exhibiting high image quality. In this paper, a pixel concept, manufacturing process, materials, and electro-optic characteristics of the FFS mode comparing with conventional in-plane switching mode, and its possible application to reflective type are discussed.

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Surface Driven Switching in Liquid Crystal Displays

  • Komitov, Lachezar
    • 한국정보디스플레이학회:학술대회논문집
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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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Light efficiency of fringe-field switching nematic liquid crystal cell depending on dielectric anisotropy value of a liquid crystal

  • Ryu, Je-Woo;Lee, Ji-Youn;Park, Ji-Woong;Lee, Seung-Hee;Lee, Gi-Dong
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.560-563
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    • 2007
  • The light efficiency of fringe-field switching (FFS) mode was found to be dependent on the magnitude of dielectric anisotropy, indicating that the voltagedependent maximal effective cell retardation value in the on state is a function of magnitude of the dielectric anisotropy of the LC.

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A Single Gap Transflective Display using Fringe Field Switching Mode (FFS(Fringe Field Switching)모드를 이용한 단일갭 반투과형 액정 디스플레이)

  • Chin, Mi-Hyung;Jeong, Eun;Lim, Young-Jin;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.388-389
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    • 2007
  • A transflective liquid crystal displays driven by fringe field switching mode of new concept is being suggested. The FFS mode is known to have the different twist angle distribution at the position when an operating voltage is applied. We make the cell design by using the different twist angle which has some region decided on transmissive region and other region used to reflective region. By optimizing simulation condition in the concept, we proposed new tansflective LCDs using FFS mode with single gap and single gamma characteristics.

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Authentic-color Characteristic of the Fringe-field Switching Mode using a Liquid Crystal with Negative Dielectric Anisotropy (유전율 이방성이 음인 액정을 이용한 Fringe-field Switching Mode의 Authentic-color 특성)

  • Song, Je-Hoon;Choi, Yoon-Seok;Moon, Dae-Gyu;Han, Jeong-In;Lee, Seung-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.6
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    • pp.633-640
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    • 2004
  • We have studied color tracking of a fringe-field driven homogenously aligned nematic liquid crystal (LC) cell with negative dielectric anisotropy and compared it with other devices such as the twisted nematic(TN) and in-plane switching(IPS) modes. According to studies, the TN device shows bluish color at grey scale and even at a low retardation cell it cannot avoid color tracking. The authentic IPS device having cell retardation value of 0.23 ${\mu}{\textrm}{m}$ also shows bluish white color. However, the FFS device shows excellent color tracking characteristics even at high retardation value of the cell while keeping high transmittance and greenish white.

The effect of splay elastic constant on the transmittance of fringe-field switching using a liquid crystal with positive dielectric anisotropy (유전율 이방성이 양인 액정을 사용한 FFS 모드에서의 스플레이 탄성상수에 따른 투과율 연구)

  • Kim, Tae-Hyun;Lee, Ji-Youn;Lee, Seung-Hee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.518-519
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    • 2005
  • We have studied the transmittance of fringe-filed switching(FFS) using a liquid crystal with positive dielectric anisotropy. Generally, FFS having positive dielectric anisotropy has less transmittance than FFS using negative dielectric anisotropy. FFS mode transmittance depends on horizontal director deformation, however fringe filed is composed of vertical and horizontal field. Vertical field in the middle of electrode suppresses the transmittance of FFS mode, especially when we use positive one. So, it is important to prevent the LC director from the effect of vertical field. We changed the splay elastic constant and checked the transmittance. The transmittance of FFS having positive dielectric anisotropy was improved. Less tilted LC directors improve the transmittance of FFS using positive dielectric anisotropy. We can improve the transmittance by using LC which have high splay elastic constant when another LC properties are equal.

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A High Quality Fringe-Field Switching Display for Transmissive and Reflective Type

  • Lee, Seung-Hee;Choi, Soo-Han
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.5-6
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    • 2000
  • Fringe-field switching (FFS) technology exhibiting a high image quality has been developed. In this paper, one pixel concept, manufacturing process, materials, and electro-optic characteristics of FFS mode comparing with conventional in-plane switching mode, and its possible application to reflective type will be discussed.

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Electro-optic characteristics of carbon nanotube-doped liquid crystal cell driven by in-plane switching and fringe-field switching

  • Shin, Seung-Hwan;Jeong, Seok-Jin;Jo, Eun-Mi;Lee, Seung-Hee;Kang, Hoon;Kim, Kyeong-Jin;Baik, In-Su;Jeong, Seok-Ho;Lee, Young-Hee;Lee, Hee-Kyu;Lee, Seung-Eun
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.556-559
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    • 2007
  • Effects of carbon nanotube (CNT) on the in-plain switching (IPS) and fringe-field switching (FFS) modes were investigated. The studies show that the CNT-doped LC cells exhibit lower transmittance but faster response time than those in the pure LC cell. Interestingly, the CNT-doped IPS and FFS modes show different characteristic in effects of operating voltage.

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