Study of Bistable Liquid Crystal Cell

• Main Authors: Yung-Chou Huang, 黃永州
• Other Authors: Bing-Mau Chen
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/81426525865902112353

碩士 === 明新科技大學 === 電子工程研究所 === 97 === In this study, we investigated the bistable effect of the bistable liquid crystal cell by different alignment technologies and process parameters. We treated the alignment layer by rubbing-alignment and photo-alignment methods and changed the process parameters to get the bistable liquid crystal cell with the high – low pre-tilt angle and strong-weak anchoring energy. In the study subject 1, we change the monomer contain ratio and the exposure energy in the photo-sensitive material S46 for studying the pre-tilt angle and anchoring energy of liquid crystal cell, then use them for strong-weak anchoring energy layers for bistable liquid crystal cell. In the study subject 2, in order to having a combination of strong and weak alignment layer in the bistable liquid crystal cell, the upper substrate is treated by rubbing process, and the lower substrate of photo sensitive polymer material S46 is treated by photo-aligned process. In addition, we drive the bistable liquid crystal cell using four driving signals to study bitable phenomenon of cell. The experimental results of the subject 1 reveal a best performance as the anchoring energy of the upper substrate is 7.3×10-5 J/m2 and that of the lower substrate is 1.2×10-5 J/m2. The difference of anchoring energy between the upper and lower substrates has a lager value to obtain better bistable effect of cell. The experimental results of the subject 2 reveal a best performance as the anchoring energy of the upper substrate is 2.13×10-4 J/m2 and that of the lower substrate is 3.0×10-5 J/m2. The difference of anchoring energy between the upper and lower substrates has an appropriate range to obtain the better bistable effect of cell. The bistable effect of the bistable liquid crystal cell with the rubbed and photo-treated alignment layer is better than that of the bistable liquid crystal cell with the photo-treated alignment layer.