High efficiency pocket-size projector with a compact projection lens and a light emitting diode-based light source system
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...
Saved in:
Published in | Applied optics (2004) Vol. 47; no. 19; p. 3406 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
United States
01.07.2008
|
Online Access | Get more information |
Cover
Loading…
Summary: | 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. |
---|---|
ISSN: | 1559-128X |
DOI: | 10.1364/AO.47.003406 |