双层复合微结构体散射导光板光学性能的研究

发布时间：2018-07-08 10:45

本文选题：导光板 + 微结构　；参考：《北京化工大学》2015年硕士论文

【摘要】：导光板(LGP, Light Guide Plate)的作用是将线光源转化为面光源,随着LED产业发展,市场对导光板的要求趋向于精细化和多元化。但是目前导光板的加工方法都有一定缺陷,这些缺陷是：加工尺寸固定、工艺复杂、间歇生产、易造成环境污染等。因此改善导光板的加工方法对导光板的应用有重要意义。本文提出利用共挤方法生产双层复合微结构体散射导光板(下称复合导光板)。该方法将微结构与散射粒子结合,以综合提高导光板的平均照度、照度偏差和光通量等光学性能。实验以PMMA为基材,散射母粒为添加剂,利用连续共挤压印的方法制备出双层复合微结构体散射导光板。其中,根据导光板各层添加散射母粒的浓度不同,共得到六种实验方案。根据导光板在LED面板灯中与反射板以及LED光源的相对位置,得到四种不同的安装方向。通过分析得到1)不同安装方向对导光板光通量影响不大；2)散射粒子浓度对照度均匀性和光通量的作用是相反的,低浓度散射粒子更利于提高照度均匀性；3)平面层不含有散射粒子时更利于光线的传导,复合导光板的设计关键是应保证一部分光线沿光源方向传播,以提高照度均匀性。利用light tools模拟上述实验方案A/B和方案B/B,经分析得到模拟与实验结果基本一致,可以利用light tools模拟代替实验分析。本文利用light tools模拟分析了V-Cut微结构的高度、顶角和间距以及半柱形微结构的高度、半径和间距对导光板光学性能的影响。通过分析可知1)V-Cut微结构的高度几乎对导光板的各光学性能没有影响；增大微结构的顶角,导光板的平均照度、光通量以及照度偏差均有很大增加；增大微结构间距,导光板的平均照度变化幅度小,照度偏差先减小后增加,光通量呈增大趋势。由此可知,若导光板表面添加V-Cut微结构,微结构的顶角对导光板的光学性能影响最大,微结构高度对导光板光学性能几乎没有影响。若要综合提高导光板的导光板性能,首先要选定微结构的顶角,其次通过调节微结构间距增加提高导光板的照度均匀性。通过模拟最好的微结构参数为H=0.2mn,顶角为50度,微结构间距D=0.9mm。2)随着半柱形微结构的高度增加,导光板的平均照度下降,照度偏差先增加后减少,光通量下降；随着微结构半径增加,导光板的平均照度增加,照度偏差先保持平稳后急剧增加,光通量增加；随着微结构间距增加,导光板的平均照度变化幅度小,照度偏差先增加后减小,光通量稍有浮动。由此可知,若导光板表面添加半柱形微结构,微结构的高度对导光板的光学性能影响最大。若要综合提高导光板的导光板性能,首先要选定微结构的高度,其次通过调节微结构间距和半径增加提高导光板的照度均匀性。通过模拟最好的微结构参数为H=0.08mm,半径为0.15mm,微结构间距D=0.9mm。本文利用light tools分析散射粒子的折射率、直径和浓度对导光板的光学性能的影响。其中,1)通过对散射粒子折射率的分析,发现当散射粒子折射率接近导光板的折射率时,导光板的综合光学性质差,随着散射粒子折射率与导光板折射率差距增大,导光板的综合光学性质先提高后下降。当散射粒子折射率为1.42和1.55时,导光板的综合光学性质较好；2)随着散射粒子直径的增加,导光板的整体照度增加,导光板的照度均匀度先上升后下降,光效利用率增加。当散射粒子直径为3μm时,导光板的综合光学性质最好；3)随着散射粒子浓度的增加,导光板的整体照度增加,导光板的照度均匀度先上升后下降,光效利用率增加。当散射粒子浓度为30000/mm3时,导光板的综合光学性质最好。通过研究微结构和散射粒子对导光板光学性能的影响,为今后研究复合导光板提供理论依据。
[Abstract]:The function of LGP (Light Guide Plate) is to transform the line light source into the surface light source. With the development of the LED industry, the demand for the light guide plate tends to be fine and diversified. But at present, there are some defects in the processing methods of the light guide plate. These defects are the fixed processing size, the complex process, the intermittent production, and the environmental pollution. Therefore, it is important to improve the processing method of the light guide plate for the application of the light guide plate. In this paper, a double layer composite microstructure scattering guide plate is produced by the co extrusion method. The method combines the micro structure with the scattered particle to improve the optical properties of the light plate, such as the average illumination, the illumination deviation and the light flux. The double layer composite microstructure scattering guide plate is prepared by using PMMA as the base material and the scattering masterbatch as additive, and six kinds of experimental schemes are obtained according to the concentration of scattering masterbatch added in each layer of the light guide plate. According to the relative position of the light guide plate in the LED panel lamp with the reflecting plate and the LED light source, the relative position of the light guide plate in the light panel lamp is obtained. Four different installation directions. By analysis, 1) different mounting directions have little influence on the luminous flux of the light guide plate; 2) the effect of the uniformity of the concentration of the scattered particles and the light flux is the opposite, and the low concentration scattering particles are more beneficial to the illumination uniformity; 3) the plane layer is more conducive to the conduction of the light, and the compound guide does not contain the scattered particles. The key of the design of the light plate is to ensure a part of light propagating along the light source in order to improve the uniformity of illumination. Using light tools to simulate the above experimental scheme A/B and scheme B/B, the simulation and experimental results are basically consistent with the experimental results. The light tools simulation can be used instead of the experimental analysis. This paper uses light tools to simulate the V-Cut microjunction The height, the top angle and the distance and the influence of the height, the radius and the distance of the semi cylindrical microstructures on the optical properties of the light guide plate. By analysis 1) the height of the V-Cut micro structure has no effect on the optical properties of the light guide plate, and the top angle of the microstructure is increased, the light flux and the illumination deviation of the light guide plate are greatly increased. Adding the distance between the microstructures, the average illumination variation of the light guide plate is small, the illumination deviation first decreases and the luminous flux increases. Thus, if the V-Cut microstructure is added to the surface of the light guide plate, the top angle of the micro structure has the greatest influence on the optical properties of the light guide plate, and the microstructural height has little effect on the optical properties of the light guide plate. In order to improve the performance of the light guide plate of the light guide plate, the top angle of the micro structure should be selected first. Secondly, the illumination uniformity of the light guide plate is increased by adjusting the distance between the microstructures. By simulating the best microstructural parameters of H=0.2mn, the top angle is 50 degrees, the micro structure spacing D=0.9mm.2) increases with the height of the semi columnar microstructure, and the average illumination of the light guide plate. With the increase of the microstructural radius, the average illumination of the light guide plate increases and the illumination deviation increases sharply first and the luminous flux increases. With the increase of the distance between the microstructures, the average illumination variation of the light guide plate is small, the illumination deviation increases first and then decreases, and the luminous flux is slightly floating. It can be seen that if a semi cylindrical microstructure is added to the surface of the light guide plate, the height of the micro structure has the greatest influence on the optical performance of the light guide plate. The microstructural parameters are H=0.08mm, the radius is 0.15mm, and the microstructural spacing D=0.9mm. is used to analyze the influence of the refractive index, diameter and concentration of the scattered particles on the optical properties of the light guide plate using light tools. 1) through the analysis of the refractive index of the scattered particles, it is found that when the refractive index of the scattered particle is close to the refractive index of the light guide plate, the synthesis of the light guide plate is found. As the refractive index of the scattered particle and the refractive index gap of the guide plate increases, the optical properties of the light guide plate will increase first and then decrease. When the refractive index of the scattered particle is 1.42 and 1.55, the comprehensive optical properties of the light guide plate are better. 2) with the increase of the scattering particle diameter, the overall illumination of the light guide plate increases and the illumination of the light guide plate is all When the evenness rises first and decreases, the utilization rate of light efficiency is increased. When the scattering particle diameter is 3 m, the comprehensive optical properties of the light guide plate are the best. 3) with the increase of the scattering particle concentration, the overall illumination of the light guide plate increases, the illumination uniformity of the guide plate rises first and then decreases, and the efficiency of light efficiency is increased. When the scattering particle concentration is 30000/mm3, the light guide plate is used. The influence of the microstructure and scattering particles on the optical properties of the light guide plate is studied, which provides a theoretical basis for the future study of the composite light guide plate.
【学位授予单位】：北京化工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM923.01

【引证文献】