Document Detail

High efficiency pocket-size projector with a compact projection lens and a light emitting diode-based light source system.
MedLine Citation:
PMID:  18594587     Owner:  NLM     Status:  PubMed-not-MEDLINE    
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.
Jui-Wen Pan; Sheng-Han Tu; Chih-Ming Wang; Jenq-Yang Chang
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Applied optics     Volume:  47     ISSN:  0003-6935     ISO Abbreviation:  Appl Opt     Publication Date:  2008 Jul 
Date Detail:
Created Date:  2008-07-02     Completed Date:  2008-08-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0247660     Medline TA:  Appl Opt     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3406-14     Citation Subset:  -    
Department of Optics and Photonics, National Central University, Jhongli, Taiwan.
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