| The role of light guide plate is to convert line light source into the surface light source. With the development of LED industry, the demand of market to light guide plate tends to refinement and diversification. But the current light guide plate processing methods have some defects, like, the processing size fixed, complex craft,batch production, easy to cause environmental pollution and so on. So improving the processing method of light guide plate has important significance for the application of light guide plate.In this paper, the method of co-extrusion to produce double composite microstructure scattering light guide plate is put forward. The method combines microstructure and scattering particles so that the optical performance, like, average illuminance, illuminance deviation, luminous flux and so on, is comprehensive improved. Different combination schemes of composite light guide plate are chosen in the experiments, and light guide plates are installed to the panel lights in different direction. Get the following conclusion through analyzing:1) different installation directions almost have no effect on the luminous flux of light guide plate, the first direction and the third direction are beneficial to improve the intensity of illumination uniformity; 2) scattering particle concentration have the opposite effect on illuminance uniformity and luminous flux, low concentration of scattering particles is beneficial to improve the intensity of illumination; 3) Due to the surface layer which does not contain the scattering particles is in fovor of the conduction of light, the key of the design of composite light guide plate is that part of light propagate along the direction of light source should been guaranteed in order to imorove the intensity of illumination uniformity. With light tools used to simulate the experimental plan A/B and B/B, the simulation results are basically in accordance with experimental results. Light tools is used in the process of light tools simulation instead of experimental analysis.This paper analyzes the effect that the different parameters of V-Cut microstructure and half-cylindrical microstructure have on the optical properties of light guide plate. Get the following conclusion through analyzing: 1) the height of the V-Cut microstructure almost has no effect on the optical properties of light guide plate; the average intensity of illumination^ illumination variation and luminous flux of light guide plate have a great increase with the increase of the vertex angle of the microstructure; with the microstructure spacing increase, the average illuminance varies within a small range, the illuminance deviation decreases first and then increase and the luminous flux increase. It can been seen that the vertex angle of V-Cut microstructure has the most impact on the optical properties of light guide plate, the height of V-Cut microstructure has little impact on the optical properties of light guide plate. If you want to improve the performance of light guide plate, the vertex angle of microstructure should been firstly chosen, secondly the spacing of microstructure is adjusted to increase the intensity of illumination uniformity. The best microstructure parameters by simulated is the height H=0.2mm, the vertex angle is 50 degree and the spacing of microstructure D=0.9mm; 2) with the increasing of the height of half-cylindrical microstructure, the average intensity of illuminance decrease, illumination variation increases first and then decrease and luminous flux decline; with the increasing of the radius of half-cylindrical microstructure, the average illuminance increases, the illumination deviation increases dramatically after a stable stage and the luminous flux increase; with the increasing of the spacing of microstructure, the average illuminance varies in a small range, illumination variation increases first and then decreases and the luminous flux floats slightly. It can been seen that the height of half-cylindrical microstructure has the most impact on the optical properties of light guide plate. If you want to improve the performance of light guide plate, the height of microstructure should been firstly chosen, secondly the spacing and radius of microstructure are adjusted to increase the intensity of illumination uniformity. The best microstructure parameters by simulated is the height H=0.08mm, the radius is 0.15mm and the spacing of microstructure D=0.9mm;This paper analyzes the effect that the refractive index, diameter and concentration of scattering particles have on the optical performance of light guide plate. Get the following conclusion through analyzing:1) the intergrated optical properties of light guide plate are poor when the scattering particles refractive index is close to the refractive index of light guide plate. The integrated optical properties improve first and then fall with the gap between the refractive index of scattering particles and the refractive index of light guide plate. The integrated optical properties are best when the refractive indexes of scattering particles are 1.42 and 1.55; 2) with the increase of scattering particle diameter, the overall intensity of illumination of light guide plate increases, the illuminance uniformity of light guide plate increases first and then decrease and the utilization rate of photosynthetic efficient increases. The integrated optical properties are best when the diameter of scattering particles is 3μm; 3) with the concentration of scattering particles increasing, the overall intensity of illumination of light guide plate increases, the illuminance uniformity of light guide plate increases first and then decrease and the utilization rate of photosynthetic efficient increases. The integrated optical properties are best when the concentration of scattering particles is 30000 cells/mm3.The effect that microstructure and scattering particles have on the optical properties of light guide plate is studied to provide theoretical basis for future research of composite light guide plate. |
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