The Design And Fabrication Of Double-sided LED Surface Source

LED has become a new generation lighting source,with the advantages of high luminous efficiency,solid state,energy saving,environmental protection,long service life and small size.It is widely used in the field of lighting and industrial production.In this study,The double side light source is made of nanocrystalline light guide plate.The optical uniformity and the optical coupling rate of the double side light source are improved by optimizing the nanocrystalline light guide plate.Optimize the structure of nanocrystalline light guide plate to improve the radiance uniformity and optical coupling rate of the double side light source.Make and test sample according to the above optimization measures.First of all,the double side light source is made of nanocrystalline light guide plate.The traditional double side light source is composed of two pieces of single surface light source with back to back,the structure is complex.A large amount of nanocrystalline particles are distributed evenly within the nanocrystalline light guide plate.The light is scattered on the doped particles.The light is soft without blip.The effect of uniform doping and the same incident light is that the upper and lower surface of the nanocrystalline light guide plate is double light out and consistent.Secondly,optimize the structure of nanocrystalline light guide plate to further improve the radiance uniformity and optical coupling rate of the double side light source.The research object is a 1000mm×1000mm×6mm nanocrystalline light guide plate.A nanocrystalline light guide plate model is established and studied in LightTools.Change the concentration and particle size of SiO₂,Al₂O₃ or TiO₂nanoparticles to grasp the influence of nanoparticles on nanocrystalline light guide plate.The simulation results show that:1.The optimal illumination uniformity of the double side light source with SiO₂,Al₂O₃ or TiO₂ nanoparticlesis about 70%.2.Optical coupling rate of the nanocrystalline light guide plate with SiO₂ nanoparticles is about 8%higher than Al₂O₃ or TiO₂ nanoparticles when the optimum light uniformity is achieved.The n nanocrystalline light guide plate adopts SiO₂nanoparticles.3.The recommended concentration range of the SiO₂ particles is5000/mm³-20000/mm³.The recommended particle size range of SiO₂ is1200nm-3000nm.The reason of the best light uniformity only 70%is the structure.Optimize the structure of nanocrystalline light guide plate to further improve the radiance uniformity and optical coupling rate of the double side light source.Finally,optimize the way of light and light structure to further improve the radiance uniformity and optical coupling rate of the double side light source.Make and test the nanocrystalline light guide plate sample of intersect and relative in light.The optical flux of intersect in light nanocrystalline light guide plate sample is753.3lm,the radiance uniformity is 34.72%.The optical flux ofrelative in light nanocrystalline light guide plate sample is 739.6lm,the radiance uniformity is78.61%.The optical coupling rate was increased by about 1.85%,and the uniformity of illumination was reduced from 78.61%to 34.72%.The attenuation of the photoconductive plate of the nanocrystalline light guide plate decreases the optical coupling rate.The unevenness of light distribution results in uneven illumination.The poor optical direction inconspicuous the improvement ofoptical coupling rate.The unevenness of light distribution results in uneven illumination.Establish an optical simulation model,the simulation results show that:The radiance uniformity can reach93.523%by adjusting the light distribution of LED lights and optimizing the method of carving outlets.Optimization of optical structure is based on optical simulation software LightTools.Designing special structures to solve the brightness and bright-dark phases near light,to solve the darkness away from light.Optimize the reflection cup of the optical structure to further improve the radiance uniformity and optical coupling rate of the double side light source.The simulation results show that:The radiance uniformity of upper surface is 88.341%,and the optical coupling rate is75.286%,he radiance uniformity of lower surface is is 88.764%,and the optical coupling rate is 75.073%.The radiance uniformity and the optical coupling rate of double side light source achieve the desired purpose,and the two sides are uniformly distributed.According to the optimized design,the samples are produced and tested.The sample test results are:1.With the optimized selection of the nanocrystalline light guide plate,the radiance uniformity of the double side light source was increased from 42.03%to 77.33%.2.With the optimized the optical structure of double side light source,the radiance uniformity of the double side light source was increased from 77.33%to 86.56%,and the optical coupling rate is 72.54%.3.Test upper and lower surface on the double side light source,the radiance uniformity of upper surface is 86.56%,the surface of light uniformity is 86.56%,the radiance uniformity of lower surface is 85.59%,Compared with the test data,the double side light source is symmetrical and evenly distributed both side.