基于自由曲面透镜的三基色LED照明系统研究
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摘要
基于三基色发光二极管(light emitting diode,LED)与方棒的投影照明系统具有色域宽、体积小的优点,但三基色LED和方棒配合使用时,存在投影亮度不高的问题。首先基于光学扩展量匹配原则选择了LED光源,然后设计了一组自由曲面的准直透镜和收集透镜。仿真结果表明:准直透镜出射光线集中在±7.5°内,方棒出射端±30°内的能量利用率为51.7%。实际加工并测试了设计的自由曲面准直透镜和收集透镜。测试结果表明:采用本文设计的没有镀减反增透膜的透镜组,投影机出射亮度比原使用镀了增透减反膜的透镜的系统高1.6%。预计设计的透镜镀减反增透膜后投影机出射亮度有望提升9.8%。
The illumination system with 3-primary-color light emitting diodes(LEDs)and light rod has the advantages of wide color gamut and small volume.However,there is a problem of low brightness when combining the 3-primary-color LEDs with the light rod.Firstly,the LED light source was selected based on the etendue theory,and then a set of free-form collimating lenses and collecting lenses were designed.The simulation results show that the light emitted by the collimator lens is concentrated within±7.5°,and the energy utilization rate within the±30°at the exit of the light rod is about 51.7%.Moreover,the designed lenses were manufactured and tested.The practical results show that the projection illuminance of the designed lenses set without the anti-reflection film can be improved by 1.6%than the original system with the antireflection film.It is expected that a 9.8%improvement of the projection illuminance can be achieved after the designed lenses are coated with the anti-reflection film.
The illumination system with 3-primary-color light emitting diodes(LEDs)and light rod has the advantages of wide color gamut and small volume.However,there is a problem of low brightness when combining the 3-primary-color LEDs with the light rod.Firstly,the LED light source was selected based on the etendue theory,and then a set of free-form collimating lenses and collecting lenses were designed.The simulation results show that the light emitted by the collimator lens is concentrated within±7.5°,and the energy utilization rate within the±30°at the exit of the light rod is about 51.7%.Moreover,the designed lenses were manufactured and tested.The practical results show that the projection illuminance of the designed lenses set without the anti-reflection film can be improved by 1.6%than the original system with the antireflection film.It is expected that a 9.8%improvement of the projection illuminance can be achieved after the designed lenses are coated with the anti-reflection film.
引文
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[3]JU Rongbing.The micro projection optical systemdesign on LED[D].Suzhou:Suzhou University,2016:30-59.居荣兵.基于LED光源的微投影光学系统设计[D].苏州:苏州大学,2016:30-59.
[4]QU Bixiang.Optical design of the DLP proiectionsystem based on RGB LED lighting[D].Hanzhou:Zhejiang University,2013:21-53.屈碧香.基于RGB三色LED光源照明的DLP投影系统光路设计[D].浙江大学,2013:21-53.
[5]FOURNIER F,ROLLAND J.Design methodologyfor high brightness projectors[J].Journal of DisplayTechnology,2008,4(1):86-91.
[6]FOURNIER F,ROLLAND J.Optimization of free-form lightpipes for light emitting diode projectors[J].Applied Optics,2008,47(7):957-966.
[7]RUI Dawei.Secondary optical design of LED microprojector lightsource[D].Chengdu:University ofElectronic Science and Technology of China,2009:20-27.芮大为.LED微型投影光源的二次光学设计[D].四川:电子科技大学,2009:20-27.
[8]FENG Qibin,YANG Guanglei,JING Changlong,etal.LED-based projection light source for solid-statevolumetric true-3Ddisplay[J].Optics and Precise En-gineering,2014,22(5):1-7.冯奇斌,杨光磊,井长龙,等.固态体积式真三维立体显示LED投影光源[J].光学精密工程,2014,22(5):1-7.
[9]ZHAO Huifu,LIU Hua,SUN Qiang,et al.Designof RIXR LED collimating system[J].Journal of Op-tics and Precision Engineering, 2011,19(7):1472-1479.赵会富,刘华,孙强,等.基于折射/全反射/反射/折射结构的LED准直系统的设计[J].光学精密工程,2011,19(7):1472-1479.
[10]PEI Zhiqi.LED projection illumination system designof high luminous efficiency and wide color gamut[D].Anhui:Hefei University of Technology,2017:20-25.裴治棋.高光效宽色域LED投影照明系统设计[D].合肥:合肥工业大学,2017:20-25.
[11]FLORIAN F,ROLLAND J.Design methodology forhigh brightness projectors[J].Journal of DisplayTechnology,2008,4(1):86-91.
[12]YU X J,HO Y L,TAN L,et al.LED-based pro-jection systems[J],Journal of Display Technology,2007,3(3):295-303.
[13]PENG C H,LI X N,ZHANG P.RGB high bright-ness LED modules for projection display application[J].Journal of Display Technology,2011,7(8):448-453.
[14]HARBERS G,BIERHUIZEN S J,KRAMES M R.Performance of high power light emitting diodes indisplay illumination applications[J].Journal of Dis-play Technology,2007,3(2):98-109.
[15]Professional standard of electronic industry ofPeople's Republic of China,Measurement for elec-tronic projectors,SJ/T 11346-2006,2006.中华人民共和国电子行业标准,电子投影机测量方法,SJ/T 11346-2006,2006.