Switching of polymer-stabilized vertical alignment liquid crystal cell.
This work investigates the switching characteristics of the polymer-stabilized vertical alignment (VA) liquid crystal (LC) cell. The experimental results reveal that the fall time of the cell declines as the monomer concentration increases because the vertically-aligned polymer networks accelerate the relaxation of the LC molecules. Furthermore, the formed polymer networks impede the growth and annihilation of LC defects, suppressing the optical bounce in the time dependent transmittance curve of the cell when the voltage is applied to the cell, substantially reducing the rise time of the cell. A step-voltage driving scheme is demonstrated to eliminate completely the optical bounce and hence improve further the rise time of the VA LC cell. The rise times of the pristine and the polymer-stabilized VA LC cells under the step-voltage driving scheme are less than 50% of those under the conventional driving scheme.
Huang
Chi-Yen
CY
Graduate Institute of Photonics and Department of Physics, National Changhua University of Education, Changhua, Taiwan, 500, Republic of China. chiyen@cc.ncue.edu.tw
Jhuang
Wen-Yi
WY
Hsieh
Chia-Ting
CT
D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D050866:Liquid Crystals / Q000737:chemistry*; D055095:Optics and Photonics / Q000295:instrumentation*; D011108:Polymers / Q000737:chemistry*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*
D011108:Polymers