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从设计、仿真与加工入手研究液晶背光模组中侧入式导光板的激光微加工技术.通过光学软件构建导光板的光学结构并采用蒙特卡洛光线追迹方法进行模拟仿真,结果表明具有渐变密度分布的微结构能够提供高均匀性的光输出.基于仿真结果,运用激光微加工技术进行验证设计.激光微加工获得的微结构在100倍光学显微镜放大测量下尺寸约为30.14μm,接近于设计值30μm,同时对单个微结构的3D表面形貌特征进行分析.十组采用激光微加工技术与丝网印刷技术加工的导光板分别安装至侧入式背光模组样机中进行对比.对比结果显示,激光微加工的导光板相比于传统的丝网印刷技术具有更好的光学均匀性和更低的色差,均匀性提高了6.2%,而色差下降了0.002 7.激光微加工技术快而简单,且整个加工过程是完全环保的,具备高性能、自动化生产和易于薄型化的优点.
Starting from the design, simulation and processing, the laser micromachining technology of the edge-type light guide plate in the liquid crystal backlight module is studied. The optical structure of the light guide plate is constructed by optical software and the Monte Carlo ray tracing method is used to simulate. The density distribution microstructure can provide high uniformity of light output.According to the simulation results, the laser micro-machining technology is used to verify the design.Laser micro-machining microstructure obtained by the magnification measurement of 100 times optical microscope size is about 30.14μm, close to The design value of 30μm, at the same time on a single microstructure of the 3D surface topography characteristics of the ten sets of laser micro-processing technology and screen printing technology processing light guide plate were mounted to the side-in backlight module prototype for comparison.Results Show that the laser micromachined light guide plate has better optical uniformity and lower color difference compared to the conventional screen printing technology, the uniformity is improved by 6.2%, and the color difference is decreased by 0.002 7. The laser micro-machining technology is fast Simple, and the entire process is completely environmentally friendly, with high performance, automated production and easy thinning advantages.