Study on the mechanism of controlling the pretilt angle of liquid crystals on argon ion beam treating polyimide film surface and surface analysis

• Main Authors: Tai, Chao-Yu, 戴兆鈺
• Other Authors: Pan, Ru-Pin
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/15973946439409341927

碩士 === 國立交通大學 === 電子物理系所 === 97 === The widely-used mechanical rubbing alignment in a liquid crystal display has some disadvantages such as leaving the debris, scratches and surface electrostatic charge. To avoid these drawbacks, Argon ion beam treating surface of polyimide (PI) film in favor of and pretilt angle controlling has been studied. An ability of inducing high pretilt angle is observed in this work. The aggregation of Fe2O3 deposit on surface due to high energy and long time ion beam bombarding. Therefore, influences of treating time and plasma energy on the alignment are discussed. To realize the mechanism of surface alignment with pretilt angle, the relation between the surface roughness and particle size has been characterized by atomic force microscope (AFM) and scanning electron microscope (SEM). Further investigations on the chemical bond on the treated surfaces have been carried out by x-ray photoelectron spectroscopy (XPS).