High efficiency pocket-size projector with a compact projection lens and a light emitting diode-based light source system
| Autor: | Jui-Wen Pan, Chih Ming Wang, Sheng Han Tu, Jenq Yang Chang |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Microlens
Materials science business.industry Materials Science (miscellaneous) Distortion (optics) Industrial and Manufacturing Engineering law.invention Digital micromirror device Lens (optics) Optics Projector law Optical transfer function Dichroic filter Optoelectronics Prism Business and International Management business |
| Zdroj: | Applied optics. 47(19) |
| ISSN: | 1559-128X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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