Effect of Chiral Dopant on Blue Phase Liquid Crystal
Blue phase liquid crystal (BPLC) shows potential for application of liquid crystal (LC) displays due to its fast response time and optical isotropic status when no voltage is applied,Butthere are some obstacles such as high operating voltage, hysteresis, residual birefringence, and weak thermal stability. In order to solve driving issue and improve device performance in LC display, the effect of chiral dopant on BPLC is investigated. As we know that the birefringence of BPLC is induced by Kerr effect and the Kerr constant is the key factor to control the driving voltage. By using the different proportion of the chiral dopant in the same LC material, we can get the different pitch of the double twist cylinder (DTC) that makes the coherence length change. With the increment of coherence length, the driving voltage decreases because the Kerr constant enlarges. However, the response time and the contrast ratio degrade. Considering all the characteristics of BPLC, the optimization of coherence length is needed. Meanwhile, the relationship between thermal stability and the proportion of chiral dopant is studied.
blue phase liquid crystal chiral dopant driving voltage coherence length
En-Wei Zhong Jian-Gang Lu Ji-Liang Zhu Xiong-Fei Sun Shui-Bin Ni
National Engineering Lab of TFT-LCD Materials and Technologies, Department of Electronic Engineering,Shanghai Jiao Tong University, Shanghai 200240, China
国际会议
China Display/Asia Display 2011(2011年中国显示/亚洲显示会议)
江苏昆山
英文
415-418
2011-11-07（万方平台首次上网日期，不代表论文的发表时间）