Title page for etd-0615113-012556


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URN etd-0615113-012556
Author Wei-ming Lai
Author's Email Address No Public.
Statistics This thesis had been viewed 5356 times. Download 264 times.
Department Electro-Optical Engineering
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Improvement of Kerr constant of blue phase liquid crystal using templating technique
Date of Defense 2013-06-25
Page Count 60
Keyword
  • liquid crystal
  • displays
  • monomer
  • polymer stabilized blue phase
  • helical twisting power
  • elastic restoring force
  • Abstract Polymer-stabilized blue phase (PSBP) is emerging as a potential candidate for use in next-generation displays because of its ultrafast response, optically isotropic dark state, and ease of fabrication. However, the high driving voltage that originates from the relatively small Kerr constant of the BP material limits its applicability.
    This work demonstrated a templating technique for improving the driving voltage of polymer stabilized blue phase (PSBP). First, a monomer-doped blue phase was polymerized and the remaining chiral nematic liquid crystal was removed, creating a porous free-standing cast that retained the 3D structure of the blue phase. The influences of the helical twisting power of the filling mesogen on the electro-optical properties of PSBP were studied.
    Templated BPs were made by washing out the nonreactive part of the original PSBP that contained 12.5 wt% polymer and by refilling the template with mesogen that varied in both concentration and handedness of chiral dopant. The driving voltage effectively decline as the chiral dopant proportion of the filling material was reduced. The elastic restoring force helped the electric field to unwind the helical structure, which is supported by the polymer anchoring force, since the mesogen tended to be less twisted intrinsically. Replacing the chiral agent with a reverse-handed one would further reduce the driving voltage by 40 %, while only slightly increasing the response time over that of the original PSBP.
    Advisory Committee
  • Andy Y.G. Fuh - chair
  • Wei Lee - co-chair
  • Kuang-Yao Lo - co-chair
  • Chi-Yen Huang - co-chair
  • Tsung-Hsien Lin - advisor
  • Files
  • etd-0615113-012556.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2013-07-16

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