LED微阵列投影系统设计
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摘要
为满足便携式投影仪的市场需求,设计了一种基于LED微型阵列的投影系统。该系统由显示单元和投影物镜构成。采用尺寸为12 mm×9 mm的自发光LED微型阵列作为系统的显示单元,利用光学设计软件设计了投影物镜。投影物镜采用反远距光学结构,全视场角为80°,焦距为8 mm,属于强光、广角镜头。在空间频率20 lp/mm处,该物镜的调制传递函数大于0. 85,畸变小于2%,符合投影系统的设计要求。该投影系统具有体积小,结构简单,投影效果好,易加工等诸多优势,可为第三代投影技术的发展提供参考。
In order to meet market demand for portable projectors,a projection system using an LED micro array and composed of a display light source and an imaging system is designed. The size of the self-luminous micro-LED array is 12 mm×9 mm. This micro-LED array is used as the light source. A projection lens suitable for the light source is designed by using Zemax software. The projection adopts an anti-distance optical structure with a full field-of-view angle of 80 degrees and a focal length of 8 mm. This projection uses a strong-light and wide-angle lens. The modulation transfer function of the objective lens is greater than 0. 85 at a spatial fre-quency of 20 lp/mm and its distortion is less than 2%,which meets the design requirements of the projection system. The projection system has many advantages,such as a small size,a simple structure,good projection,easy production,etc.. It can also provide reference for the development of third-generation projection technology.
In order to meet market demand for portable projectors,a projection system using an LED micro array and composed of a display light source and an imaging system is designed. The size of the self-luminous micro-LED array is 12 mm×9 mm. This micro-LED array is used as the light source. A projection lens suitable for the light source is designed by using Zemax software. The projection adopts an anti-distance optical structure with a full field-of-view angle of 80 degrees and a focal length of 8 mm. This projection uses a strong-light and wide-angle lens. The modulation transfer function of the objective lens is greater than 0. 85 at a spatial fre-quency of 20 lp/mm and its distortion is less than 2%,which meets the design requirements of the projection system. The projection system has many advantages,such as a small size,a simple structure,good projection,easy production,etc.. It can also provide reference for the development of third-generation projection technology.
引文
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[19]李晓彤,芩兆丰.几何光学·像差·光学设计[M].第3版.杭州:浙江大学出版社,2014.LI XI T,CEN ZH F.Geometrical Optics,a Berrations and Optical Design[M].Third Edition.Hangzhou:Zhejiang University Press,2014.(in Chinese)
[2]吕伟振,刘伟奇,魏忠伦,等.大屏幕投影显示光学系统的超薄化设计[J].光学精密工程,2014,22(8):2020-2025.LV W ZH,LIU W Q,WEI ZH L,et al..Design of ultra-thin optical systems in large screen projection display[J].Opt.Precision Eng.,2014,22(8):2020-2025.(in Chinese)
[3]HUNG K Y,CHUANG Y J,TSAI Y W,et al..Integration of the innovative 3D micro prism design and fabrication technology for a pico-projection system[C].International Conference on Optical MEMS and Nanophotonics.IEEE,2014:109-110.
[4]翟奕,刘永基,何远清.投影式头戴静脉显像光学系统的设计[J].中国光学,2015,8(1):114-120.ZHAI Y,LIU Y J,HE Y Q.Optical system design of the head-mounted projective display for vein imaging[J].Chinese Optics,2015,8(1):114-120(in Chinese)
[5]CHOU H H,LIAW S K,JIANG J S,et al..Experimental study of red-,green-,and blue-based light emitting diodes visible light communications for micro-projector application[J].Fiber&Integrated Optics,2016,35(3):98-113.
[6]陈琛,胡春海.球幕投影通用型变焦鱼眼镜头设计[J].光学精密工程,2013,21(2):323-335.CHEN CH,HU CH H.Design of general type zoom fish-eye lens for dome-screen projector[J].Opt.Precision Eng.,2013,21(2):323-335.(in Chinese)
[7]SUN W S,PAN J W.Non-telecentric projection lens design for an LED projector[J].Applied Optics,2017,56(3):712-720.
[8]陈晓西,李光勇,王继岷,等.基于液晶多层屏的3D显示系统和算法设计[J].液晶与显示,2017,32(4):302-307.CHEN X X,LI G Y,WANG J M,et al..Liquid crystal multi-layer 3D display system and algorithm design[J].Chinese Journal of Liquid Crystals and Displays,2017,32(4):302-307(in Chinese).
[9]LIU Z J,WONG K M,CHI W K,et al..Monolithic LED microdisplay on active matrix substrate using flip-chip technology[J].IEEE Journal of Selected Topics in Quantum Electronics,2009,15(4):1298-1302.
[10]DAY J,LI J,LIE D Y C,et al..III-Nitride full-scale high-resolution microdisplays[J].Applied Physics Letters,2011,99(3):031116.
[11]WONG K M,LAU K M,CHONG W C,et al..360 PPI flip-chip mounted active matrix addressable light emitting diode on silicon(LEDo S)micro-displays[J].IEEE/OSA Journal of Display Technology,2013,9(8):678-682.
[12]BAO X P,LIANG J,LIANG Z,et al..Design and fabrication of Al Ga In P-based micro-light-emitting-diode array devices[J].Optics Laser Technology,2016,78:34-41.
[13]BI X P,XIE T,FAN B,et al..A flexible,micro-lens-coupled LED stimulator for optical neuromodulation[J].IEEETransactions on Biomedical Circuits&Systems,2016,10(5SI):972-978.
[14]SAND A,RAKKOLAINEN I.Mixed reality with multimodal head-mounted pico projector[C].Virtual Reality International Conference:Laval Virtual.2013:1-2.
[15]郝亚茹,邓招奇,邓春健.LED显示控制系统移存频率加速方法研究[J].液晶与显示,2016,31(5):470-476.HAO Y R,DEGN ZH Q,DENG CH J.Increasing shift frequency of LED display control system[J].Chinese Journal of Liquid Crystals and Displays,2016,31(5):470-476.(in Chinese)
[16]吕伟振,刘伟奇,张大亮.激光与LED混合投影光源色度学特性分析[J].液晶与显示,2015,30(2):369-373.LV W ZH,LIU W Q,ZHANG D L.Colorimetric analysis of laser and LED hybrid projection sources[J].Chinese Journal of Liquid Crystals and Displays,2015,30(2):369-373.(in Chinese)
[17]HERRNSDORF J,MCKENDRY J J D,ZHANG S,et al..Active-matrix Ga N micro light-emitting diode display with unprecedented brightness[J].IEEE Transactions on Electron Devices,2015,62(6):1918-1925.
[18]李林,黄一帆,王涌天.现代光学设计方法[M].北京:北京理工大学出版社,2015.LI L,HUANG Y F,WANG Y T.The Method of Optical Design[M].Beijing:Beijing Institute of Technology Press,2015.(in Chinese)
[19]李晓彤,芩兆丰.几何光学·像差·光学设计[M].第3版.杭州:浙江大学出版社,2014.LI XI T,CEN ZH F.Geometrical Optics,a Berrations and Optical Design[M].Third Edition.Hangzhou:Zhejiang University Press,2014.(in Chinese)