PI成膜对液晶显示特性的作用

发布时间：2018-07-25 09:01

【摘要】：伴随着现代化的发展,显示器件在这一潮流中得到了飞速发展,以液晶显示器为代表的新一代平板显示器件迅速进入人们的生活。随着“家电下乡”等政策的出台,液晶产品拥有量不断增大和使用的普及,人们对液晶显示产品在响应时间,对比度,广视角及低功耗等方面的显示品质上,也提出了更高的要求。如今响应时间、残像等显示特性已成为全世界学术研究的重点。液晶分子在玻璃基板表面液晶取向层上的不同排列直接影响着显示功能,而液晶配向层作为液晶的基载层与液晶直接接触。因此,液晶配向层表面液晶分子的排布一定程度上受配向层性能的影响,进而,显示器的对比度、响应时间等显示特性也受到影响。本文主要针对TN产品液晶配向层成膜后的特性做了相关研究。首先,分析了PI膜面形成的各工艺条件与预倾角的影响关系;其次,在不同工艺条件下制成不同配向膜产品,通过残像及响应时间等光学测试,分析了不同工艺条件下制成的PI膜特性对残像及响应时间等显示特性的影响关系。然后,在液晶动力学理论基础上,结合预倾角与响应时间的理论关系和液晶盒响应时间的实验结果,分析了液晶配向层对液晶响应方面的影响作用。通过本文的相关研究发现,配向膜的厚度和热处理对残像和响应时间有一定的影响。当配向膜的厚度偏低时,会出现轻微的线残像;热处理温度和时间不足时,会出现轻微的线残像,同时响应时间会随着预倾角的减小而变快。这在一定程度上为残像和响应时间的研究添增了新的视野。
[Abstract]:With the development of modernization, display devices have been rapidly developed in this trend. The new generation of flat panel display devices, represented by liquid crystal displays, are rapidly entering people's lives. With the introduction of policies such as "Home Appliance going to the Countryside", the quantity of liquid crystal products has been increasing and the use of liquid crystal products has been popularized. The display quality of liquid crystal display products in response time, contrast, wide viewing angle and low power consumption has been improved. Higher demands have also been put forward. Now response time, residual image and other display characteristics have become the focus of academic research all over the world. The different alignment of liquid crystal molecules on the liquid crystal orientation layer on the glass substrate directly affects the display function, and the liquid crystal alignment layer acts as the substrate carrier layer of the liquid crystal directly in contact with the liquid crystal. Therefore, the distribution of liquid crystal molecules on the surface of the liquid crystal alignment layer is affected to some extent by the performance of the orientation layer, and the display characteristics such as contrast and response time are also affected. In this paper, the characteristics of liquid crystal film of TN were studied. Firstly, the relationship between the technological conditions of Pi film surface formation and predip angle was analyzed. Secondly, the different orientation film products were prepared under different process conditions, and the residual image and response time were measured. The influence of Pi film characteristics on the display characteristics of residual image and response time was analyzed. Then, based on the theory of liquid crystal dynamics and the theoretical relationship between predip angle and response time and the experimental results of liquid crystal cell response time, the effect of liquid crystal alignment layer on liquid crystal response is analyzed. It is found that the thickness of the film and the heat treatment have a certain influence on the residual image and response time. When the thickness of the film is on the low side, there will be a slight line remnant, and when the heat treatment temperature and time are insufficient, the line remnant will appear slightly, and the response time will become faster with the decrease of the predip angle. To some extent, it adds a new field of vision for the study of residual images and response time.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN873

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