Pan Jui-Wen, Tu Sheng-Han, Wang Chih-Ming, Chang Jenq-Yang
Department of Optics and Photonics, National Central University, Jhongli, Taiwan.
Appl Opt. 2008 Jul 1;47(19):3406-14. doi: 10.1364/ao.47.003406.
We present a light emitting diode (LED)-based ultramini digital micromirror device projector with a size of 75 mm x 67 mm x 42 mm and a weight of 338 g. The LED illuminator inside this projector makes it possible to achieve a volume of 18 cm(3) by using a dichroic filter and a collimating lens. The illumination system consists of high uniformity of 93% through a microlens array as a homogenizer. A total internal reflection prism is also used to reduce the size of both the illumination system and the telecentric projection lens. A projection lens system with an ultrasmall track of 42 mm, including a high modulation transfer function value of 0.4 at 46.2 line pairs/mm, an optical distortion of only 0.25 %, and a television distortion of 0.01%, is designed. Through the above superior specification, we can produce a 20 in. (51 cm) color display comparable in brightness to a laptop with a contrast of 3700:1. The device is compact and suitable for personal use.
我们展示了一款基于发光二极管（LED）的超小型数字微镜器件投影仪，其尺寸为75毫米×67毫米×42毫米，重量为338克。该投影仪内部的LED照明器通过使用二向色滤光片和准直透镜，实现了18立方厘米的体积。照明系统通过微透镜阵列作为均匀器，实现了93%的高均匀度。全内反射棱镜也用于减小照明系统和远心投影镜头的尺寸。设计了一种超小轨道为42毫米的投影镜头系统，包括在46.2线对/毫米处具有0.4的高调制传递函数值、仅0.25%的光学畸变和0.01%的电视畸变。通过上述卓越的规格，我们可以生产出一台20英寸（51厘米）的彩色显示器，其亮度与笔记本电脑相当，对比度为3700:1。该设备紧凑，适合个人使用。
