小尺寸集成化导光板下表面微棱镜排布规律研究

发布时间：2019-05-14 17:33

【摘要】：背光模组是液晶显示应用中的关键器件,其主要作用是向液晶屏幕提供高亮度和高均匀性的面光源。典型背光模组由光源、双层正交增亮膜、扩散膜、反射膜以及导光板五部分组成,存在结构复杂、光能利用率低等问题。本实验室前期所研制的一体化导光板,将增亮膜、反射膜以及扩散膜的功能集成于一体,实现结构的最简化。但由于一体化概念将反射膜也一并集成,超越了目前业界成熟的复制流程,不利于设计的产业化。因此,本文重点研究对象是集成化导光板,即将典型背光模组中的双层正交增亮膜、扩散膜与导光板集成为一体,而反射膜分离,从而与产业界复制工艺流程保持一致。由于反射膜与集成化导光板之间存在着空气层,由光波导理论可知,集成化导光板中的光线传输与一体化导光板中存在物理本质上的差异,需要对高性能参数下的集成化导光板的结构参数进行重新设计并分析相应的规律。基于实验室前期对集成化导光板上表面半柱状非球面阵列结构以及下表面微棱镜单元结构参数的设计、优化,本论文研究了小尺寸集成化导光板下表面微棱镜排布规律,研制了一款五英寸集成化导光板金属模板,并初步研究了激光雕刻技术用于集成化导光板的可行性。主要研究成果如下:(1)建立了小尺寸集成化导光板下表面微棱镜的排布公式。对于不同尺寸(三至七寸)的集成化导光板,调整其下表面微棱镜排布使亮度均匀性达85%以上,通过数值分析集成化导光板的宽度、长度对微棱镜排布的影响,拟合出集成化导光板下表面微棱镜排布公式以及该公式中的系数与导光板结构参数的关系式。运用上述公式直接计算得出的微棱镜排布方式,能够使背光模组的亮度均匀性达到80%,提高了设计效率。(2)设计了一款五英寸集成化导光板并研制其金属模板。对(1)中设计的五英寸集成化导光板进行结构参数冗余度分析,同时根据加工条件对集成化导光板设计参数进行了修正,成功研制出一款五英寸集成化导光板金属模板,以用于制作样品。(3)探索了激光雕刻技术用于集成化导光板的可行性。将激光加工技术应用于集成化导光板下表面微结构的雕刻,对加工得到的微结构参数进行了测试及模拟分析,并重新设计优化了集成化导光板上表面的微聚光结构,建模仿真得到的亮度均匀性为73.24%,仿真结果表明该应用具有可行性。
[Abstract]:Backlight module is the key device in liquid crystal display application, its main function is to provide high brightness and high uniformity surface light source to liquid crystal screen. The typical backlight module is composed of five parts: light source, double layer orthogonal brightening film, diffusion film, reflective film and light guide plate. There are some problems, such as complex structure and low utilization ratio of light energy. The integrated light guide plate developed in our laboratory integrates the functions of brightening film, reflective film and diffusion film to simplify the structure. However, because of the integration concept, the reflective film is also integrated, which goes beyond the mature replication process in the industry and is not conducive to the industrialization of design. Therefore, the focus of this paper is the integrated light guide plate, that is, the double layer orthogonal brightening film in the typical backlight module, the diffusion film and the light guide plate are integrated, and the reflection film is separated, which is consistent with the replication process of the industry. Because there is an air layer between the reflective film and the integrated light guide plate, it can be seen from the optical waveguide theory that there is a physical difference between the light transmission in the integrated light guide plate and the integrated light guide plate. It is necessary to redesign the structural parameters of the integrated light guide plate with high performance parameters and analyze the corresponding laws. Based on the design and optimization of the semi-cylindrical aspherical array structure on the upper surface of the integrated light guide plate and the structural parameters of the microprism element on the lower surface of the integrated light guide plate, the arrangement law of the micro prism on the lower surface of the small size integrated light guide plate is studied in this paper. A five-inch integrated light guide plate metal template is developed, and the feasibility of laser engraving technology for integrated light guide plate is studied. The main research results are as follows: (1) the arrangement formula of micro prism on the lower surface of small size integrated light guide plate is established. For the integrated light guide plate of different sizes (three to seven inches), the arrangement of the micro prism on the lower surface is adjusted to make the brightness uniformity reach more than 85%. The influence of the width and length of the integrated light guide plate on the arrangement of the micro prism is analyzed by numerical value. The arrangement formula of micro prism on the lower surface of the integrated light guide plate and the relationship between the coefficient in the formula and the structural parameters of the light guide plate are fitted. The arrangement of microprism calculated directly by using the above formula can make the brightness uniformity of backlight module reach 80% and improve the design efficiency. (2) A five-inch integrated light guide plate is designed and its metal template is developed. The redundancy of the structural parameters of the five-inch integrated light guide plate designed in (1) is analyzed, and the design parameters of the integrated light guide plate are modified according to the processing conditions, and a metal template of the five-inch integrated light guide plate is successfully developed. To make samples. (3) the feasibility of laser engraving technology for integrated light guide plate is explored. The laser processing technology is applied to the engraving of the microstructure of the lower surface of the integrated light guide plate. The microstructure parameters obtained are tested and simulated, and the microfocusing structure of the surface of the integrated light guide plate is redesigned and optimized. The brightness uniformity obtained by modeling and simulation is 73.24%. The simulation results show that the application is feasible.
【学位授予单位】：深圳大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN873.93

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