Li-ping Lai,Qi-ren Zhuang,De-juan Liang.Design of an efficient projector for LED flat lamp without light guide plate[J].Optoelectronics Letters,2013,9(6):441-445 Design of an efficient projector for LED flat lamp without light guide plate Author Name Affiliation E-mail Li-ping Lai  College of Information Science and Engineering, Huaqiao University, Xiamen, 361021, China    Qi-ren Zhuang  College of Information Science and Engineering, Huaqiao University, Xiamen, 361021, China  qrzhuang@hqu.edu.cn  De-juan Liang  College of Information Science and Engineering, Huaqiao University, Xiamen, 361021, China    Abstract:       An efficient LED projector is designed for the LED flat lamp without light guide plate (LGP), in order to get high-efficiency lighting capablility and low cost of LED flat lamp. By employing refraction and total reflection, uniform intensity distribution of the emergent light and high-efficiency lighting capablility are achieved. The simulation results show that the output efficiency and intensity distribution on LED flat lamp panel depend on the distance between projector and output panel, the rotation angle of the projector and the gap between projector and LED. It performs well in both lighting efficiency and uniformity, while a distance of 5 mm, a rotation angle of 2° and a gap of 1.2 mm are used with the panel size of 240 mm×360 mm in the LED flat lamp without LGP. And 96.6% of optical uniformity is achieved. Hits: 3788 Download times: 0 This work has been supported by the Key Science and Technology Project of Fujian Province of China （No.2012H0029）. View Full Text    Download reader