Electro-Optical Properties of Homogeneous Liquid-Crystal Cells Dopedwith Nanosolids

• Main Authors: Jia-Shiang Gau, 高迦翔
• Other Authors: Wei Lee
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/70439603728293077229

碩士 === 中原大學 === 應用物理研究所 === 93 === Abstract This thesis focuses on electro-optical effects in homogeneous cells of pristine and nanosolid（C60 or Carbon nanotubes）-doped nematic liquid crystal in the presence of dc or ac voltage. The purpose is to observe the hysteresis characteristics that manifests the charge-retention effect in homogeneous liquid-crystal cells. Experimental evidence indicates that a nanoscale carbon dopant can affect the behavior of an antiparallel-aligned liquid crystal cells in terms of ion-charge effects and that doping with nanotubes can effectively reduce the dc threshold voltage. On the other hand, parallel-aligned liquid-crystal cells do not posses a lower dc threshold voltage by doping carbon nanotubes. Under the application of an ac voltage, all cells exhibit unobserved ion-charge effect. In comparison with those operated by dc voltage, the threshold voltage of antiparallel-aligned cells is apparently lower and the threshold voltage of parallel-aligned cells is even more greatly lowered. The difference between threshold values of doped and undoped cells is small.