Title page for etd-0717115-163416


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URN etd-0717115-163416
Author Wei-Hung Lai
Author's Email Address keler897@gmail.com
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Department Electro-Optical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Reliability study of polymer dispersed liquid crystal
for smart window application
Date of Defense 2015-07-28
Page Count 61
Keyword
  • photo-degradation
  • UV absorber
  • polymer disperse liquid crystal
  • Abstract “Active Energy-saving Smart Window” is an active system that has ability to adjust the radiation of sunlight. One of those technologies is “using polymer dispersed liquid crystal (PDLC) to fabricate an electrical driving system of smart window which can regulate outdoor light.” Such a technology has a great effect on privacy protection because the mechanism of the dark state could scatter the incident light. By controlling applied voltage, users can depend on their requirement to switch the transmittance of light from outsides. However, there is about 5% to 8% ultraviolet light in the sunlight. The ultraviolet light not only harms the skin of human beings, but also causes the organic polymer’s degradation such as yellowing, cracking, chalking…etc.
    In this work, we research the forming principle of PDLC at first and understand the electro-optical characteristics of PDLC in different parameters of manufacture. Next, to study the electro-optical characteristics of liquid crystal before and after UV irradiation such as refractive index anisotropic, threshold voltage, response time and optical transmittance. We surmise the influence of polymer’s degradation via compare the degradation of liquid crystal with PDLC. Then, we discuss the EO-characteristics of PDLC in different morphologies under the irradiation of UV light. At the end, we give a solution to improve the lifetime of PDLC in irradiation of UV light. Making use of doping UV absorber in PDLC, we study the parameters of manufacture and discuss the lifetime under the irradiation of UV light.
    Advisory Committee
  • Andy Y.G. Fuh - chair
  • Tsung-chih Ko - co-chair
  • Ko-Ting Cheng - co-chair
  • Tsung-Hsien Lin - advisor
  • Files
  • etd-0717115-163416.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2015-08-17

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