Title page for etd-0630113-111139


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URN etd-0630113-111139
Author Heng-Kai Chang
Author's Email Address No Public.
Statistics This thesis had been viewed 5353 times. Download 177 times.
Department Electro-Optical Engineering
Year 2012
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Light-driven, multistable and full-color reflective blue phase liquid crystal display
Date of Defense 2013-06-25
Page Count 75
Keyword
  • full-color reflective display
  • 4MAB
  • trans-cis isomerization
  • photoinduced
  • blue phase
  • Abstract Blue phase(BP) is a mesophase existed at temperature range between cholesteric phase and isotropic phase. BP can be classified into BP I and BP II according to their crystal structures. BP I is body-center cubic(BCC) and BP II is simple cubic(SC). Since BP is a self-assembled 3D photonic crystal, it has periodic structure and Bragg reflection properties. Due to the different structures of BP I and BP II, it provide with various photonic bandgap and wavelength of Bragg reflection. In this thesis, our purpose is to control the reflection wavelength of azo-dye doped BP using photo-addressing to achieve color reflective display.
    First, we doped azo-dye to the blue phase liquid crystal. The trans-cis photoisomeration of azo-dye could be induced by irradiated 404nm laser. It can change the phase transition temperature of BPLC. The cholesteric phase would be changed to BP and then to isotropic phase at the same temperature under suitable excitation. Then irradiation of 532nm laser can induce back photoisomeration which can induce isotropic phase back into BP then to cholesteric phase. So we could obtain the desired reflection colors through the photoisomeration cycle. There are three colors(red, green, blue) in our BP as bright state. The isotropic phase with black background can be used as dark state. This study achieves a Light-driven, multistable and full-color reflective blue phase liquid crystal display.
    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-0630113-111139.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2013-07-30

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