低阈值高对比度PDLC薄膜的制备.pdfVIP

第26卷第1期显示V01．26，N0．1

2011年2月CrystalsaridDisplaysFeb．。2O11

文章编号；1007—2780(2011)01—004905

低阈值高对比度PDLC薄膜的制备

谢建辉，黄子强

(电子科技大学光电信息学院，四川成都610054，E-mail：xiejianhuil@163．eom)

摘要：采用PIPS法制备聚合物分散液晶(PDLC)薄膜，通过在液晶／预聚物复合体系中添加甲基丙烯酸丁

酯调控聚合物与液晶微滴界面的锚定能，以改善PDLC的电光特性。研究了甲基丙烯酸丁酯含量对PDLC

膜的偏光显微镜下形貌、光电性能的影响，最后优化工艺参数，制备出低阈值、高对比度的PDLC薄膜。实验

e结果表明，适量加入甲基丙烯酸丁酯有利于降低闽值电压和饱和驱动电压。另外，还研究了PDLC薄膜的电

J

光特性与驱动电压频率的关系，发现PDIC的阂值电压和饱和驱动电压均随着频率的升高而增大，同时电光

液一曲线趋于平缓。

∞

晶关键词：聚合物分散液晶；甲基丙烯酸丁酯；电光特性；形貌

q中图分类号：0753．2文献标识码：ADOI：10．3788／YJYX0049

与蒯

PreparationofPDLCFilmswithLow-ThresholdVoltageandHigh—CR

XIEJian-hui，HUANGZi—qiang

(SchoolofOptoelectronicInformation，UniversityofElectronicScienceandTechnologyofChina，

Chengdu610054，China，E-mail：xiejianhuil@163．corn)

Abstract：PDLCfilmswerepreparedbymeansofpolymerizationinducedphaseseparation

(PIPS)，butylmethaerylatearemixedtogetherwithphotosensitiveprepolymerandnematic

liquidcrystalincertainratiotoreducetheanchoringenergyofthesurfacebetweenpolymer

andLCdroplets，andtoprogresstheL丁characteristicsaswel1．Theinfluenceofdifferent

butylmethacrylateratioonPDLCfilmswasstudied．Theenvironmentfactorswasoptimized

topreparePDLCfilmswiththebestquality，lowthreshold-voltageandhighCR(contrastra—

tio)．Itisdemonstratedthattheadditionofbutylmethacrylatedogoodtoreducethedriving

voltage．ThispaperalsostudiedtheinfluenceofdrivingfrequencyonE-Ocharacteristicsof

PDLCfilms．Theexperimentalresultsshowthatthethresholdvoltageandsaturabledriving

voltageofPDLCgetlargerwiththeincreaseo