标题: | 奈米粒子掺杂双稳态液晶元件之研究 Bistable liquid crystal devices doped with aerosil nanoparticles |
作者: | 林建宏 Lin, Jian-Hong 郑协昌 Jeng, Shie-Chang 影像与生医光电研究所 |
关键字: | 奈米粒子;记忆效果;阀值电压;双频液晶;Nanoparticles;Memory effect;Threshold Voltage;Dual frequency liquid crystal |
公开日期: | 2010 |
摘要: | 本研究利用液晶掺杂二氧化矽奈米粒子形成光散射之稳态效应的双频液晶元件。施加交流讯号时,液晶分子因转动而破坏原先奈米粒子因氢键形成之网络结构,因而形成一个新的具有规律性的网络,即使将交流讯号移除时,此元件仍具有稳态的现象。我们的研究主要针对液晶元件施加不同的频率、电场与讯号波形时,分析其对穿透度、阀值电压、记忆现象与响应时间之光电特性影响,并利用双频液晶混合奈米粒子达成其双稳态之显示切换。 最后为了尝试降低双频液晶之切换频率,藉由化学合成方式选择具有酯化官能基的正型液晶去完成所要双频液晶。 The electro-optical properties of liquid crystal devices based on light scattering have been investigated for nematic liquid crystal (LC) / nanoparticles (aerosil) composites. By applying ac electric field to the device , a normally scattering LCD become transparent due to LC molecules and aerosil network reorient toward the E-field. The former aerosil network is being broken and a new stable network is being formed. Besides, this transparent state is retained if the E-field is switched off. The influences of driving frequency、electric field and waveform on electro-optical characteristics of transmission, threshold voltage , memory effect and response time were studied. Then, we used the dual frequency liquid crystal /nanoparticles composites to switch the bistable mode. Finally, we tried a single ester positive compound to decrease the cross-over frequency of dual liquid crystal by the chemical synthetic method. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT079806514 http://hdl.handle.net/11536/46675 |
显示于类别: | Thesis |