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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chen, SHSubject: search.filters.subject.absorption

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Now showing 1 - 3 of 3
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    Effects of dichroic dye in UV-cured polymer dispersed liquid crystal films
    (1996-05-01)
    Wu, JJ
    ;
    Wang, CM
    ;
    Chen, SH
    ;
    光電工程研究所
    ;
    Institute of EO Enginerring
    We study the effects of dichroic dye in ''ultraviolet'' polymer dispersed liquid crystal (PDLC) films. Experimental data show that for a dye-doped PDLC film the absorption coefficient for He-Ne laser light is different from that for UV light. Transmittance of a PDLC film changes when the UV curing intensity or dye concentration is varied. It is found that under UV the illumination with a constant intensity the dye concentration can be optimized to obtain minimum transmittance and to improve the contrast ratio. Correspondingly, for a fixed dye concentration the UV curing intensity can be optimized to obtain a minimum transmittance. The experimental results can be described by a theory based on Beer's law. Besides, the experimental results show that the curing temperature is an important factor that affects the nematic liquid crystal droplet size in the UV curing process.
  • Thumbnail Image
    Item type:Item,
    Electrooptical properties of aligned dye-doped polymer dispersed liquid crystal films
    (1998-12-01)
    Wu, JJ
    ;
    Wang, CM
    ;
    Li, WY
    ;
    Chen, SH
    ;
    光電工程學系
    We investigate how plane-parallel and twisted alignment treatments influence the electrooptical properties of dye-doped polymer dispersed liquid crystal (PDLC) films. These films are transparent in the electric field-on state and opaque in the field-off state. The relationship between field-off state transmittance of such dye-doped PDLC films and polarization of the incident light is discussed. Experimental data confirm that, even for unpolarized : Incident light, the contrast ratio of these aligned films surpasses that of a nonaligned dye-doped PDLC film.
  • Thumbnail Image
    Item type:Item,
    Effects of dichroic dye in UV-cured polymer dispersed liquid crystal films
    (1996-05-01)
    Wu, JJ
    ;
    Wang, CM
    ;
    Chen, SH
    ;
    光電工程學系
    ;
    Department of Photonics
    We study the effects of dichroic dye in ''ultraviolet'' polymer dispersed liquid crystal (PDLC) films. Experimental data show that for a dye-doped PDLC film the absorption coefficient for He-Ne laser light is different from that for UV light. Transmittance of a PDLC film changes when the UV curing intensity or dye concentration is varied. It is found that under UV the illumination with a constant intensity the dye concentration can be optimized to obtain minimum transmittance and to improve the contrast ratio. Correspondingly, for a fixed dye concentration the UV curing intensity can be optimized to obtain a minimum transmittance. The experimental results can be described by a theory based on Beer's law. Besides, the experimental results show that the curing temperature is an important factor that affects the nematic liquid crystal droplet size in the UV curing process.