光学各向同性液晶材料及其在2D/3D兼容显示应用中的关键技术

Optically-isotropic liquid crystal has some attractive features including no need for alignment layer, sub-millisecond response time, and polarization-independent. Moreover, it exhibits excellent performance and has a simple device structure. 2D/3D compatible display is the forefront research in information display field, which has scientific significance and industrial value. In this project, we will research on material of optically-isotropic liquid crystal and key technologies of its application in 2D/3D compatible display. The research contents are organized as follows: to reveal the influence of monomer on the operating voltage, including molecular structure of monomer and composition; to clarify the influence of the photo-polymerizable monomer in polymer dispersed liquid crystal on the microstructure of the polymer network, such as molecular structure, composition, content, polymerization conditions; to find the way to reduce the operating voltage and obtain the optically isotropic liquid crystal material with low operating voltage by designing molecules and mixing materials; to reveal the relationship between the microscopic model of optically-isotropic liquid crystal and the macroscopic effect; to improve the Kerr effect model of optically-isotropic liquid crystal and find the way to reduce and eliminate the hysteresis effect; to develop optically-isotropic liquid crystal lens with excellent structure and obtain its focusing properties, fabrication process and application properties in 2D/3D compatible display; to make a breakthrough in 2D/3D compatible display technology based on optically-isotropic liquid crystal lens and using integrated imaging; to develop 2D/3D compatible display prototype with excellent performance.

光学各向同性液晶不需取向层，响应时间为亚毫秒级，光学特性与偏振无关，其器件结构简单，性能优良；2D/3D兼容显示是信息显示领域的前沿，具有科学意义和产业价值。本项目将进行各向同性液晶材料及其在2D/3D兼容显示应用中的关键技术研究，具体包括：揭示单体液晶的分子结构和组成对工作电压的影响规律，阐明聚合物分散各向同性液晶中光聚合单体的分子结构、组成、含量、聚合条件等因素对高分子网络微观结构的影响规律，寻找降低工作电压的分子设计和材料混配的方法，获得低工作电压的各向同性液晶材料；揭示各向同性液晶的微观模型与宏观效应之间的关系，完善各向同性液晶的克尔效应模型，提出减小和消除迟滞效应的方法；研制具有优良结构的各向同性液晶透镜，获得其变焦特性、制作工艺及其在2D/3D兼容显示中的应用特性；突破基于各向同性液晶透镜并采用集成成像的2D/3D兼容显示技术，研制性能良好的2D/3D兼容显示器。

本项目研究了各向同性液晶材料及其在2D/3D兼容显示应用中的关键技术，取得的主要研究成果如下：（1）合成了一系列化学结构不同的单体液晶和光聚合单体，研究了光聚合单体的分子结构、组成、聚合条件等因素对高分子网络微观结构的影响规律，构建了低工作电压的各向同性液晶体系。（2）建立了全空间分子排列的各向同性液晶晶格模型，该模型能描述各向同性液晶晶格内所有格点上的分子指向矢分布，从理论上解释了各向同性液晶显示器暗态漏光的原因，提出了降低迟滞效应的方法。（3）提出了基于双层电极结构的各向同性液晶透镜，具有亚毫秒响应、偏振无关和驱动电压低等特性。（4）研制了基于各向同性液晶透镜的2D/3D兼容显示器，实现了2D全屏显示、3D全屏显示以及2D/3D同屏兼容显示的三大功能，2D/3D切换时间为0.44毫秒，各向同性液晶透镜驱动电压为9.2V。项目执行期间，共发表SCI论文68篇，申请中国发明专利21项，其中授权11项，负责人入选万人计划和国际信息显示学会会士，担任Optics Express的Associate Editor，培养了15名研究生和4名青年教师。举办国际会议1次，共同举办国际会议4次。