High efficiency pocket-size projector with a compact projection lens and a light emitting diode-based light source system

Jui-Wen Pan*, Sheng Han Tu, Chih Ming Wang, Jenq Yang Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

We present a light emitting diode (LED)-based ultramini digital micromirror device projector with a size of 75 mm × 67 mm × 42 mm and a weight of 338 g. The LED illuminator inside this projector makes it possible to achieve a volume of 18 cm3 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.

Original languageEnglish
Pages (from-to)3406-3414
Number of pages9
JournalApplied Optics
Volume47
Issue number19
DOIs
StatePublished - 1 Jul 2008

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