【作者】 王晓丽；

【导师】 周雪琴； 田启祥；

【作者基本信息】 天津大学 ， 化学工程， 2012， 硕士

【摘要】 柔性显示器件由于其轻、薄、可挠曲和耐冲击等性能，特别适用于移动电话、笔记本电脑、电子书、电子海报、汽车仪表板、传感器等。利用柔性可弯曲特性使得工程设计不局限于平面化，可实现多元化外型的显示模式。反射式胆甾相液晶显示利用胆甾相液晶的Bragg选择性反射与双稳态特性，使得其具有功耗低、零电场下图像保存时间长并且不需要背光源等优点。为了拓宽柔性液晶器件的应用范围，本论文研究工作围绕柔性胆甾相液晶显示器件的制备展开，分为三个部分研究柔性器件的制备工艺和器件的性能。本论文第一部分选择了以镀有氧化锡铟的聚对苯二甲酸乙二酯薄膜为柔性电极（ITO-PET），以间隔子控制器件厚度，研究了灌注法柔性器件制备工艺，制备了界面致稳型胆甾相液晶柔性显示器件。利用接触角测试仪、显微镜、紫外-可见分光光度等分析了胆甾相液晶显示器件的微观结构及光电特性。结果表明，表面处理涂层可与液晶分子作用并产生界面致稳效应；采用大小为6μm的间隔子，当改性层溶液中间隔子质量分数为3%时，制备了有效面积为10×15cm2的柔性双稳态液晶显示器件，其驱动电压为40V时在550nm的透过率为90%，器件在640nm处反射率可达42%。本论文第二部分选择明胶和聚乙烯醇作为复合乳化剂，分别探讨了不同乳化工艺、涂布工艺、物料配比等对器件制备过程的影响，结果表明：在水浴温度40℃，搅拌速度2000rpm下、乳化30min的工艺下，并掺杂了相应的间隔子后得到了均匀、细腻、稳定的胆甾相液晶乳液；以制得的液晶乳液为产品原料，制备了可弯折的柔性胆甾相液晶显示器件，通过对不同厚度的柔性胆甾相液晶显示器件电致变色性能的表征，结果表明器件厚度越小，其驱动电压越低。本论文最后进行对灌注法所制备的器件进行性能分析和应用探索。器件性能测试结果表明：器件可在0-64℃温度范围内正常使用，在45V电压的驱动下可实现4万次以上双稳态的转换，器件可实现弯折并具有良好的耐水、耐盐水和耐酸性；对器件的应用探索结果表明：器件联用方式可进一步扩大了器件的有效显示面积；也可通过对器件电极进行图案或字符设计，实现预期图案的双稳态清晰显示与长期保存，说明器件可实现动态或静态图案显示。并进行了器件可擦式压敏式写字板的应用实验，实现了信息的存储功能，为以后柔性器件的产业化应用提供了依据。更多还原

【Abstract】 Flexible displays are especially suitable for mobile phones, laptops, electronicbooks, electronic posters, automotive dashboards as well as car sensors because of itslight, thin, flexible and impact-resistant properties. Its flexible feature makes theproject design not only confined to be plane, but also have the diversified appearanceof the display mode. Due to Bragg selective reflection and bistable properties, LCDshave the advantages of low power consumption, without backlight, and long-timeimage saving in the power-off situation. In order to broaden the application of flexibleliquid crystal, the processes and properties of the flexible devices had been studied inthis thesis.Firstly, flexible cholesteric liquid crystal devices were prepared with ITO-PETfilms via perfusion method using spacers to control the thickness of devices. Effectsof processing parameters were investigated and optimized. The microstructure andmorphology of the devices were studied using Contact Angle Tester and Microscope,and the electrical properties of the devices using UltravioletvisibleSpectrophotometer(UVS). The results show that the inductive effect of the interfacecoating effectively improves the stability of the liquid crystal alignments. Thusflexible bistable cholesteric liquid crystal devices were obtained using spacers of6μmsize. The effective display area could reach10×15cm2with a transmittance of90%at550nm and a reflectivity of42%in the640nm.Secondly, gelatin and PVA were employed as the emulsifier and the influencesof emulsification conditions, vatious coating processes and raw material ratios wereanalyzed. In this way uniform, exquisite, stable liquid crystal emulsion was preparedat the conditions:40℃in the water bath, stirring speed2000rpm, emulsification time30min and addition of corresponding spacer. Then the flexible PSCT devices wereobtained with different thickness. Characterization results of the electrochromicproperties show that the thinner the device is, the lower the driving voltage.Finally, the properties and applications of devices prepared via prefusion methodwere studied. Results of device performance tests show that: the devices can work atthe temperature ranging from0to64℃, with a transform recycle between two steadystates of over40,000times under45V voltage driven; the devices are flexible and hasgood resistance to water, salt water and acid; Moreover, the effective display area of the devices can be enlarged through the device-coupling; a characteristic displayexperiment was carried out after treating the electrode with etching technology. Thedesired pattern of two steady states can clearly display with a long-term preservation.These indicate that the device can realize dynamic or static images display. Besides,the experiments of pressure-sensitive tablet were carried and the storage capabilitiesof the LCD was showed. The work provided a basis for future industrial applicationsof flexible device.更多还原