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|Type of Document
||Modify Surface Charestist to Produce Zigzag-free Surface Stablized Ferroelectric Liquid Crystal Device|
|Date of Defense
surface free energy
||In our study, we use mixed polyimide method and different rubbing conditions to modify surface characteristics for producing zigzag-free surface stablized ferroelectric liquid crystal(SSFLC) device. We utilize contact angle measuring system to obtain the surface free energy and also use rotating crystal method to measure the pretilt angle. Finally, we observe optical textures of SSFLC device with polarized optical microscope.|
In mixed polyimide experiment, we can approximately provide the pretilt angle between 0° and 90°, and we also demonstrate different pretilt angle is modified by the surface of different surface free energy. In the end of this experiment, we obtain the better optical texture of SSFLC device in 18.3° pretilt angle, but part regions of the texture still possess zigzag defects.
In different rubbing conditions experiment, when the cumulative number of rub is 2 or 3 times in 0.3mm pile impression, we can produce zigzag-free SSFLC device in different horizontal polyimide alignment materials.
||Mei-Ying Chang - chair|
Chi-Huang Lin - co-chair
Tsung-Hsien Lin - co-chair
Wen-Jun Zheng - advisor
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|Date of Submission