温度对液晶盒电容的影响  

Influence of temperature on the capacitance of liquid crystal cell

作　　者：郝慧明[1] 张平[1] 张翰卿[1] 王晓燕[2,3] 叶文江[1] 

机构地区：[1]河北工业大学理学院,天津300401 [2]河北冀雅电子有限公司,河北石家庄050071 [3]河北省液晶显示器工程技术研究中心,河北石家庄050071

出　　处：《液晶与显示》2016年第8期755-759,共5页Chinese Journal of Liquid Crystals and Displays

基　　金：河北省自然科学基金(No.A2014202123);河北省教育厅项目(No.QN2014130);大学生创新创业训练计划项目(No.201510080058);河北省高校重点学科资助课题~~

摘　　要：液晶盒电容的大小与外加电压的数值相关。当液晶的温度发生变化时,即使施加的电压值一定,液晶盒的电容也会发生变化。为了研究温度的影响,采用交流电桥的方法对灌注5CB液晶的平行排列向列相液晶盒电容进行了实验测量,并由精密热台(LTS350,Linkam)控制液晶盒的温度,得到了不同温度下液晶盒的电压-电容特性曲线。由此可以看出:在大于阈值电压范围内,同一电压下液晶盒电容随温度的升高逐渐增加,并且曲线的斜率逐渐减小,说明液晶向各向同性态转变。此项研究对进一步分析液晶材料的介电常数有一定的指导意义。The capacitance of liquid crystal cell is associated with the value of external applied voltage. When the temperature of the liquid crystal is changed, the capacitance of liquid crystal cell will also change even if the applied voltage has a certain value. In order to research the influence of tempera- ture, adopting the method of alternating current （AC） bridges, the capacitance of parallel aligned ne- matic （PAN） liquid crystal cell filled in liquid crystal 5CB is measured experimentally, where the pre- cision hot stage （LTS350, Linkam） is used to control the temperature of liquid crystal cell. The volt- age-capacitance characteristic curves of PAN cell for different temperatures are obtained. Within the scope greater than the threshold voltage, with the increasing of temperature the capacitance of PAN cell increases gradually under the same voltage and the Curve slope is gradually reduced, which sug- gests that LC transforms gradually into the isotropic state. The study has certain guiding significance on further analyzing the dielectric constant of liquid crystal material.

关 键 词：液晶盒电容 交流电桥 平行排列向列相 介电常数 

分 类 号：O753.2[理学—晶体学]