Electro-Optical and Ionic Charge Characteristics of the Nanoparticle-doped Liquid Crystal Cells

• Main Authors: Heng-Cheng,Song, 宋恒誠
• Other Authors: Chi-Yen,Huang
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/03950197075452317094

碩士 === 國立彰化師範大學 === 光電科技研究所 === 99 === This thesis investigates the electro-optical and ionic charge characteristics of the carbon nanotube (CNT)-doped vertical alignment (VA) liquid crystal (LC) cell and the silica nanoparticle-doped electrically controlled birefringence (ECB) LC cells. In the CNT-doped VA LC cell, the doped CNTs suppress the amounts of the ionic impurities and also change the surface anchoring energy of the substrate, changing the response time of the cell. The anchoring energy of the substrate of the CNT-doped VA cell is time dependent. 3 days after the cell is fabricated, the anchoring energy of the substrate increases with increasing CNT concentrations. However, 50 days after the cell is fabricated, the anchoring energy of the substrate decreases with increasing CNT concentrations. In the silica nanoparticle-doped ECB cell, the anchoring energy of the substrate and the dielectric anisotropy of the LCs decrease with increasing silica nanoparticle concentrations. Furthermore, the doped silica nanoparticles is found effective in controlling the pretilt angle of the cell. However, the controlled pretilt angle of the cell depends on the employed surface alignment materials.