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Subject: search.filters.subject.homeotropic

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Now showing 1 - 5 of 5
  • Thumbnail Image
    Item type:Item,
    Suppression of the hysteresis in a homeotropic aligned ferroelectric liquid crystal film
    (1997-04-01)
    Chen, CY
    ;
    Chen, SH
    ;
    光電工程研究所
    ;
    Institute of EO Enginerring
    We investigated electro-optical effects in a homeotropic-aligned ferroelectric liquid crystal film. Hysteresis was observed in this cell. The width of the hysteresis could be suppressed by appropriate adjustment of external parameters in the experiment and the unwinding electric Geld could be reduced by rubbing of the substrate. The rewinding electric field could Le increased by making the cell thicker.
  • Thumbnail Image
    Item type:Item,
    Electrooptical properties of an aligned phase-change guest-host mode liquid crystal display
    (1998-12-01)
    Wu, JJ
    ;
    Lee, TY
    ;
    Chen, SH
    ;
    Kuo, CL
    ;
    光電工程研究所
    We have studied the electrooptical properties of an aligned phase-change guest-host (PCGH) mode liquid crystal display. Samples with various thickness-to-natural pitch ratios d/p(0) are fabricated. For each d/p(0), we measure the phase transition fields, the ON- and OFF-state transmittances and the response times. The phase transition fields are compared to the numerical values calculated from theory, In addition, it is found that when d/p(0) greater than or equal to 1.2 the d/p(0) ratio hardly affects the transmittances but does affect the response times of the sample film. The experimental result also demonstrates that the response times and the phase transition voltages are affected by the rubbing condition.
  • Thumbnail Image
    Item type:Item,
    Electrooptical properties of an aligned phase-change guest-host mode liquid crystal display
    (1998-12-01)
    Wu, JJ
    ;
    Lee, TY
    ;
    Chen, SH
    ;
    Kuo, CL
    ;
    光電工程學系
    We have studied the electrooptical properties of an aligned phase-change guest-host (PCGH) mode liquid crystal display. Samples with various thickness-to-natural pitch ratios d/p(0) are fabricated. For each d/p(0), we measure the phase transition fields, the ON- and OFF-state transmittances and the response times. The phase transition fields are compared to the numerical values calculated from theory, In addition, it is found that when d/p(0) greater than or equal to 1.2 the d/p(0) ratio hardly affects the transmittances but does affect the response times of the sample film. The experimental result also demonstrates that the response times and the phase transition voltages are affected by the rubbing condition.
  • Thumbnail Image
    Item type:Item,
    Phase gratings in pretilted homeotropic cholesteric liquid crystal films
    (2002-10-01)
    Wu, JJ
    ;
    Chen, FC
    ;
    Wu, YS
    ;
    Chen, SH
    ;
    光電工程學系
    We studied the fingerprint texture of homeotropic cholesteric liquid crystal (CLC) films. Parallel (360) and antiparallel (180) alignment treatments were adopted for these films such that the molecules at the boundaries had an approximately I pretilt angle to the substrate normal. The experimental results showed that the homeotropic film may be more suitable than the planar-parallel film for use in an electrically controlled phase grating.
  • Thumbnail Image
    Item type:Item,
    Suppression of the hysteresis in a homeotropic aligned ferroelectric liquid crystal film
    (1997-04-01)
    Chen, CY
    ;
    Chen, SH
    ;
    交大名義發表
    ;
    光電工程學系
    ;
    National Chiao Tung University
    We investigated electro-optical effects in a homeotropic-aligned ferroelectric liquid crystal film. Hysteresis was observed in this cell. The width of the hysteresis could be suppressed by appropriate adjustment of external parameters in the experiment and the unwinding electric Geld could be reduced by rubbing of the substrate. The rewinding electric field could Le increased by making the cell thicker.