Title page for etd-0125108-144906


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URN etd-0125108-144906
Author Hsi-kun Lee
Author's Email Address No Public.
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Department Electro-Optical Engineering
Year 2007
Semester 1
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The Study of Electro-optical Properties of Passive-drive Vertical Alignment LC Cell
Date of Defense 2008-01-14
Page Count 70
Keyword
  • sharpness
  • STN
  • passive-drive
  • Vertical alignment
  • Abstract This study investigated the electro-optic characteristics of VAN (vertical-alignment nematic)liquid crystal device in passive mode, and tried to present the advantage of high contrast ratio which belongs to VA mode. The experiment consisted of three parts: 1. Change different cell thickness(d = 12μm、6μm、4.9μm). 2. Chang LC with the different value of dielectric(Δε= -3.7、-6.1). 3. Chang LC with different refraction anisotropy(Δn = 0.15、0.078). We drive those samples with different number of duty in passive mode, and to measure the electro-optic characteristics, including VT curve, response time, and contrast ratio.
    We knew that STN(Super Twist Nematic LCD)has the drawbacks of lower contrast ratio, higher operational voltage and slower response time within higher duty in passive mode. And the same problem comes with VAN in passive-drive mode, although it is said VAN has the high performance of contrast ratio. The contrast ratio is worse then STN when driving in higher duty. As a result of VAN is kind of ECB mode, its transparency has a big matter with light retardation. We find that in the same condition of driving duty, the value of cell gap or the Δn become larger, the value of the sharpness and the contrast ratio become larger.
    Advisory Committee
  • Wen-yao Huang - chair
  • Mei-ying Chang - co-chair
  • Tsung-hsien Lin - co-chair
  • Wen-jun Zheng - advisor
  • Files
  • etd-0125108-144906.pdf
  • indicate accessible in a year
    Date of Submission 2008-01-25

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