Abstract

We present a light emitting diode (LED)-based ultramini digital micromirror device projector with a size of 75mm×67mm×42mm and a weight of 338g. The LED illuminator inside this projector makes it possible to achieve a volume of 18cm3 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 42mm, 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 20in. (51cm) color display comparable in brightness to a laptop with a contrast of 3700:1. The device is compact and suitable for personal use.

© 2008 Optical Society of America

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