CAJ | 학술논문

近年来，液晶器件的响应速度得到了很大的改善，响应时间已经从25 ms 减少到3 ms 甚至更短。虽然这种改善与液晶层厚度的变薄有关，但主要原因应该归因于新型液晶材料的发展和使用。色序液晶显示能产生更高质量的图像，但前提是必须有能快速工作的液晶材料。液晶材料的旋转黏度系数、双折射和液晶层的厚度是影响液晶器件响应时间的3个主要因素。本文以液晶双折射这一因素为主线，从液晶化合物结构的角度介绍了影响液晶双折射数值的若干因素，包括中心环结构、中心基团上的桥键、极性基团和侧位-F 对液晶双折射的影响等，延长分子的π电子共轭长度能有效提高液晶的双折射。本文列举了国内外已合成的高双折射向列相液晶的分子结构及双折射值，最后对高双折射液晶的研究进行了展望。
근년래，액정기건적향응속도득도료흔대적개선，향응시간이경종25 ms 감소도3 ms 심지경단。수연저충개선여액정층후도적변박유관，단주요원인응해귀인우신형액정재료적발전화사용。색서액정현시능산생경고질량적도상，단전제시필수유능쾌속공작적액정재료。액정재료적선전점도계수、쌍절사화액정층적후도시영향액정기건향응시간적3개주요인소。본문이액정쌍절사저일인소위주선，종액정화합물결구적각도개소료영향액정쌍절사수치적약간인소，포괄중심배결구、중심기단상적교건、겁성기단화측위-F 대액정쌍절사적영향등，연장분자적π전자공액장도능유효제고액정적쌍절사。본문열거료국내외이합성적고쌍절사향렬상액정적분자결구급쌍절사치，최후대고쌍절사액정적연구진행료전망。
In recent years,the response speed of LCDs has been greatly improved.The response time has been reduced from 25 ms to 3 ms or less.Although this improvement related to reducing thickness of the liquid crystal layer,the main reason was attributed to the studying and using of novel liquid crystal mixtures.Sequential color LCDs can produce higher quality images,but prerequisite is to have fast response liquid crystal materials.The three main factors which influence the response time of the LCDs are the rotational viscosity coefficient of the liquid crystal,the birefringence and thickness of the liquid crystal layer.This paper focuses on the birefringence of liquid crystal and describes several fac-tors which influence the birefringence from the molecular structure of the liquid crystal compounds, including the central ring structure,the bridging groups on the center,the polar group and the “-F”on the lateral.Extending the length of π-electron conjugation of molecules can improve the birefrin-gence of liquid crystal.This paper lists the molecular structures and birefringence of several nematic liquid crystal compounds with high birefringence which has been synthesized.Finally,the research of high birefringence liquid crystal is prospected.