• Title/Summary/Keyword: TN cell

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Response Characteristics of Fast TN Cell on a Polyimide Surface (폴리이미드 표면에서의 고속 TN 셀의 응답 특성)

  • Jeon, Yong-Je;Hwang, Jeong-Yeon;Jeong, Youn-Hak;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.11a
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    • pp.514-517
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    • 2002
  • We investigated response characteristics of twisted nematic (TN) cell with different nematic liquid crystals (NLCs) and cell gap d on a rubbed polyimide (PI) surface. High transmittance and fast response time of the TN cell on the rubbed PI surface were achieved by using high birefringence (${\Delta}n$) and low cell gap d. The response time of TN cell on the rubbed PI surface was measured 5.1 ms. The transmittance and response time of the TN cell on the rubbed PI surface decreased with decreasing ${\Delta}nd$.

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A Study on Response Characteristics of TN Cell on a Polyimide Surface (폴리이미드 표면에서의 TN 셀의 응답 특성에 관한 연구)

  • 황정연;전용제;정연학;서대식
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.15 no.9
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    • pp.808-811
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    • 2002
  • We investigated response characteristics of twisted nematic (TN) cell with different nematic liquid crystals (NLCs) and cell gap d on a rubbed polyimide (PI) surface. High transmittance and fast response time of the TN cell on the rubbed PI surface were achieved by using high birefringence (Δn) and low cell gap d. The response time of TN cell on the rubbed PI surface was measured 5.1 ms. The transmittance and response time of the TN cell on the rubbed PI surface decreased with decreasing Δnd.

Study for Thermal Stability of Liquid Crystal Device (액정 소자의 열적 안전성에 관한 연구)

  • 이상극;황정연;서대식;이준웅
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.4
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    • pp.439-442
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    • 2004
  • In this study, we investigated about electrooptics characteristic of three kinds of TN cell on the polyimide surface. Monodomain alignments of thermal stressed TN cell over temperature of liquid crystal isotropic phase were almost the same as that of no thermal stressed TN cells. However, the thermal stressed TN cells have many defects. Also, threshold voltage and response time of thermal stressed TN cells show the same performances as no thermal stressed TN cells. There were little changes of value in these TN cells. However, transmittances of TN cells on the polyimide surface decrease with increasing thermal stress time. Finally, the residual DC voltage of the thermal stressed TN cell on the polyimide surface shows decrease of characteristics as increasing thermal stress time. Therefore, the thermal stability of TN cell was decreased by high thermal stress for the long times.

Adipogenic function of tetranectin mediated by enhancing mitotic clonal expansion via ERK signaling

  • Go, Seulgi;Park, Jihyun;Rahman, Safikur;Jin, Juno;Choi, Inho;Kim, Jihoe
    • BMB Reports
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    • v.54 no.7
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    • pp.374-379
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    • 2021
  • Tetranectin (TN), an adipogenic serum protein, enhances adipocyte differentiation, however, its functional mechanism has yet to be elucidated. In the present study, we investigated the adipogenic function of TN by using medium containing TN-depleted fetal bovine serum (TN-del-FBS) and recombinant mouse TN (mTN). The adipocyte differentiation of 3T3-L1 cells was significantly enhanced by mTN supplementation essentially at differentiation induction, which indicated a potential role of the protein in the early differentiation phase. The adipogenic effect of mTN was more significant with insulin in the differentiation induction cocktail, implicating their close functional relationship. mTN enhanced not only the proliferation of growing cells, but also mitotic clonal expansion (MCE) that is a prerequisite for adipocyte differentiation in the early phase. Consistently, mTN increased the phosphorylation of ERK in the early phase of adipocyte differentiation. Results of this study demonstrate that the adipogenic function of mTN is mediated by enhancing MCE via ERK signaling.

Study for thermal stability of Liquid Crystal Device (액정 소자의 열적 안전성에 관한 연구)

  • Lee, Sang-Keuk;Hwang, Jeoung-Yeon;Seo, Dae-Shik;Lee, Joon-Ung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.04a
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    • pp.9-12
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    • 2004
  • In this study, we investigated about electrooptics characteristic of three kind of TN cell on the polyimide surface. Monodomain alignments of thermal stressed TN cell over temperature of liquid crystal isotropic phase were almost same that of no thermal stressed TN cells. However, the thermal stressed TN cell have many defects. Also, threshold voltage and response time of thermal stressed TN cells show same performances of no thermal stressed TN cells. There were little changes of value in these TN cells. However, transmittances of TN cells on the polyimide surface decrease with increasing thermal stress time. Finally, the residual DC voltage of the thermal stressed TN cell on the polyimide surface show decrease of characteristics as increasing thermal stress time. Therefore, thermal stability of TN cell was decreased by high thermal stress for the long times.

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Fast Switching Properties of TN Cell With Graphene Quantum Dots (그라핀 양자점을 도핑한 TN 셀의 고속 스위칭 특성)

  • Kim, Dai-Hyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.27 no.2
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    • pp.110-114
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    • 2014
  • In this study, we report the doping effect of graphene quantum dots (QDs) in nematic liquid crystal (NLC) system on rubbed polyimide (PI) surface. The good LC alignment and high thermal stability in QD-LC cell system on rubbed PI surfaces can be measured. Also, the low threshold voltage of QD-TN cell was observed about 2.77 V. The fast response time of 13.2 ms for QD-TN cell can be achieved. Finally, the good voltage holding ratio of QD-TN cell on rubbed PI surface was measured.

Fast Switching of a Polymer-networked Twisted Nematic Liquid Crystal Cell (폴리머 네트워크가 형성된 TN 액정셀의 고속응답 특성)

  • Jin, Hye-Jung;Kim, Ki-Han;Baek, Jong-In;Kim, Jae-Chang;Yoon, Tae-Hoon
    • Korean Journal of Optics and Photonics
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    • v.21 no.2
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    • pp.69-73
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    • 2010
  • We propose a method to enhance the response time of a twisted nematic liquid crystal (TN-LC) cell using an anisotropic polymer. Polymer networks are formed by the phase separation between a LC and a UV-curable polymer. A TN-LC cell is exposed to UV light after the mixture of LC and anisotropic polymer is injected into the TN-LC cell. As a result, turn-off time of a TN-LC cell can be decreased remarkably without any loss of the transmittance. The turn-off time of a TN-LC cell with pure LC was 16 ms, but those of polymer networked TN-LC cells were 12, 11, and 9 ms when the concentration of the polymer was 3, 5, and 10 wt%, respectively. Moreover, by virtue of the polymer network, the backflow effect and the delay time generated during the turn-off process disappeared.

Fast Response Characteristics in Liquid Crystal Display in the High birefringence nematic liquid crystal (고굴절 네마틱 액정에서의 액정 디스플레이의 고속응답 특성)

  • Kim, Jong-Hwan;Hwang, Jeoung-Yeon;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.11a
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    • pp.498-501
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    • 2003
  • We investigated response characteristics of twisted nematic (TN) cell with different nematic liquid crystals (NLCs) and cell gap d on a rubbed polyimide (PI) surface. High transmittance and fast response time of the TN cell on the rubbed PI surface were achieved by using high birefringence (${\Delta}n$) and low cell gap d. The transmittance and response time of the TN cell on the rubbed PI surface decreased with decreasing ${\Delta}nd$. The fast response time of TN cell using high birefringence with ${\Delta}nd=0.363$ on the rubbed PI surface was measured 5.1 ms.

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Study of Electro-Optical Characteristics on Photoalignment TN Cell using a High Thermal Photopolymer (고내열성 광폴리머 표면을 이용한 광배향 TN 셀의 전기광학 특성의 연구)

  • Lee, Whee-Won;Hwang, Jeoung-Yeon;Nam, Ki-Hyung;Lee, Myun-Gil;Suh, Dong-Hack;Seo, Dae-Shik
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.05a
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    • pp.210-213
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    • 2004
  • We synthesized photoalignment material of high thermal resistance with hydroxyl aromatic polyimide, and studied the liquid crystal (LC) aligning capabilities on the photopolymer layers. Also, electro-optical (EO) performances for the twisted-nematic (TN)-liquid crystal display (LCD) photoaligned with linearly polarized UV exposure were investigated. A good LC alignment with UV exposure on the photopolymer surface can be obtained. However, the low pretilt angles were obtained below $1^{\circ}$. The Voltage-transmittance (V-T) curve without backflow bounce in the photoaligned TN cell with UV exposure was observed. The response time of photoaligned TN cell was measured about 24 ms. Finally, The photoaligned TN cell has few hysteresis, and shows the residual DC voltage that is less.

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Genetic Analysis of Caulobuter crescentus by Using Transposon Tn5 and Reverse Field Electrophoresis (Transposon Tn5 및 Reverse Field Electrophoresis를 이용한 Caulobuter crescentus의 유전자 분석 연구)

  • 구본성;버트일리
    • Microbiology and Biotechnology Letters
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    • v.17 no.3
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    • pp.183-187
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    • 1989
  • The bacteriophage Mu and transposon Tn5 containing plasmid pJB4JI-transferred transposon Tn5 to Caulobuter crescentus. When several thousand of transposon Tn5 insertion mutants were examined, we found auxotrophic and motility mutants at frequencies of 2% and 3%, respectively. Transposition of transposon Tn5 was analyzed by the reverse field electrophoresis and Southern hybridization. The results indicated that transposon Tn5 was randomly inserted to Caulobuter crescentus chromosome but the plasmid vector, pJB4JI, was not maintained.

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