Homogenized LED-illumination using microlens arrays for a pocket-sized projector

We present an LED-based ultra-mini DMD projector with a size of 75 mm x 67 mm x 42 mm. A compact homogenizer consisting of a double-side microlens array and two condensers was proposed to reduce the size of the pocket-sized projector. The homogenizer not only allowed for a reduction in the total tra...

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Bibliographic Details
Published in:Optics express 2007-08, Vol.15 (17), p.10483-10491
Main Authors: Pan, Jui-Wen, Wang, Chih-Ming, Lan, Hsiao-Chin, Sun, Wen-Shin, Chang, Jenq-Yang
Format: Article
Language:English
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Summary:We present an LED-based ultra-mini DMD projector with a size of 75 mm x 67 mm x 42 mm. A compact homogenizer consisting of a double-side microlens array and two condensers was proposed to reduce the size of the pocket-sized projector. The homogenizer not only allowed for a reduction in the total track length of the system, but also reduced the angle of the rays emitted from the LED with the micro field lens array. The double-side well-aligned 124 x 146 microlens array was fabricated using backside alignment and hot embossing techniques. The microlens array was square-arranged and the fill-factor was extremely high. The uniformity and total throughput of this projector were higher than those of the current pocket-sized projectors. Moreover, the optical performances of the projector such as color difference and the LED alignment tolerance were also measured and discussed.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.15.010483