导光板(LGP)网点的散射能力直接影响了背光模组的光能利用率和网点密度,快速选出最佳网点结构对企业生产非常重要。提出了用LGP网点散射效率评价网点有效导光能力的方法,基于企业已量产的LGP网点密度档,分别从理论和实验分析了网点倾角对散射效率的影响,并将获得的最佳网点结构应用于实际加工。结果表明,该方法能给出网点散射效率与光能利用率、有效发光面积和网点密度的关系,并得到光能利用率最大时对应的倾角范围为25°~60°,在该范围内网点散射效率与倾角呈正相关。以散射效率较高的网点对LGP重新进行均匀优化设计,发现网点数量可减少60%,光能利用率仅降低2%,且LGP实际加工效果与仿真结果相吻合。

The scattering ability of light guide plate (LGP) dots directly affects the light energy utilization and dot density of backlight module, so quick selection of the best dot structure is very important for manufacturers. This paper proposed a method to evaluate the effective light guiding ability of dots by LGP dot scattering efficiency. Based on the LGP dot density file that has been mass-produced by the manufacturers, the influence of the dot inclination angle on the scattering efficiency was studied theoretically and experimentally, and the best dot structure obtained was applied to actual processing. The results show that the method can reveal the correlation among the dot scattering efficiency, the light energy utilizaiton rate, the effective light-emitting area and the dot density. An inclination angle range of 25°--60° corresponding to the maximum light energy utilization rate can be obtained. In this range, the dot scattering efficiency and inclination angle are positively correlated. By re-optimizing the LGP uniformly with dots with higher scattering efficiency, it is found that the number of dots could be reduced by 60%, the light energy utilization rate is only reduced by 2%, and the actual machining effect of LGP is consistent with the simulated effect.