基于LED光源的DLP光学引擎的光学设计

摘要

设计了一种基于LED光源照明系统的DLP背投电视光学引擎,样机以HD2+数字微镜(DMD),蝇眼透镜,X棱镜作为主要光学系统构件.介绍了基于光学扩展量etendue的光学系统设计方法,采用了蝇眼透镜阵列作为匀光方案来提高光能利用率和光源均匀度,分析了照明系统的工作原理和系统结构,并给出了仿真结果,样机在三组LED占空比为10:15:11的时序工作模式下白场输出光通量达到了112.3 lm,单色输出光通量分别为R.26.1 lm、G-51.4 lm、B-19.0 lm,光场均匀度小于±20%.%A new DLP Optical Engine based on LED Light Source in the illuminating system for rear projection television(RPTV)is proposed.The prototype employs HD2+Digital Micromirror Device(DMD)as the image chip,and the Fly-Lens as the homogeneous elements.The principle of the optical design method based on etendue is analyzed to design the system structure.The Fly-Lens illumination system has been employed tO realize high light collection efficiency and the optical uniformities and the optical component design is discussed.The simulation result is also proposed.Finally,the prototype is manufactured and the test result is compared to the simulation result.The white field output flux is 112.3 lm,and the homochromatic output flux R-26.1 lm,G-51.4 lm and B-19.0 lm is achieved with timing sequence distribution for the three groups of LEDs R:G:B(10:15:11).The uniformities are below±20%.