Sung Shi-Joon, Yang Kee-Jeong, Kim Dae-Hwan, Do Yun Seon, Kang Jin-Kyu, Choi Byeong-Dae
Division of Nano and Bio Technology, Daegu Gyeongbuk Institute of Science and Technology, 711 Hosan-dong, Dalseo-gu, Daegu 704-230, Korea.
J Nanosci Nanotechnol. 2009 Dec;9(12):6938-42. doi: 10.1166/jnn.2009.1603.
Inorganic thin films are well known for the liquid crystal alignment layers for LCoS application due to the higher thermal and photochemical stability of inorganic materials. The switching time of liquid crystals is the important factor for the projection application and the faster switching time is required for the high quality display. The switching behavior of liquid crystal molecules on inorganic thin films might be closely related with the surface properties of the inorganic thin films. Therefore the understanding of surface properties of the inorganic thin films is required for the enhancement of the switching time of liquid crystals of LCoS devices. In this work, we prepared the SiO2 inorganic thin films and the electro-optical behavior of liquid crystal molecules on SiO2 thin film was investigated. The sputtering condition of SiO2 thin film was closely related with the thickness and the surface morphology of SiO2 thin film. The switching time of liquid crystals with negative dielectric constant on SiO2 inorganic thin films was dominantly affected by the size of protrusion on the surface of SiO2 thin film and the surface roughness of SiO2 thin film was also related with the switching time of liquid crystals. From these results, it is possible to prepare the SiO2 inorganic thin film suitable for the liquid crystal alignment layer for VAN LC mode.
由于无机材料具有更高的热稳定性和光化学稳定性，无机薄膜作为用于LCoS应用的液晶取向层而广为人知。液晶的切换时间是投影应用的重要因素，高质量显示需要更快的切换时间。液晶分子在无机薄膜上的切换行为可能与无机薄膜的表面性质密切相关。因此，为了提高LCoS器件中液晶的切换时间，需要了解无机薄膜的表面性质。在这项工作中，我们制备了SiO2无机薄膜，并研究了液晶分子在SiO2薄膜上的电光行为。SiO2薄膜的溅射条件与SiO2薄膜的厚度和表面形貌密切相关。具有负介电常数的液晶在SiO2无机薄膜上的切换时间主要受SiO2薄膜表面突起尺寸的影响，SiO2薄膜的表面粗糙度也与液晶的切换时间有关。从这些结果来看，有可能制备出适用于VAN LC模式液晶取向层的SiO2无机薄膜。
