Study on the Process of UV Irradiation on a Polyimide Layer and its Alignment Property to Liquid Crystal

• Main Authors: Lin Chia-Jen, 林家任
• Other Authors: Chao Ru-Pin
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/445kra

碩士 === 國立交通大學 === 電子物理系所 === 92 === Nissan 130B is a polyimide (PI), commonly used for liquid crystal (LC) alignment. In this study, we show that Nissan 130B can also be used as the photoalignment film material. We demonstrate the patterned alignment can be achieved by using the photomask and Nissan 130B. In the experiments, we also measure the pretilt angle and the surface anchoring strength of the film to LC. The pretilt angle of LC is very small, and it means that the LC molecules almost lay on the substrate. Measuring the surface anchoring strength of the film of various irradiation and heating time, we can find out the best photoalignment process condition. We find out the best photoalignment process condition: The PI irradiation energy is 0.972 J/cm2, and the baked condition is under 170oC for 1 hour.