Abstract

A newly designed ultrasmall total internal reflection prism with a size of 29  mm×22 mm×24 mm and weight of 19 .5 g is proposed for use in a pocket-sized Digital Micromirror Device projector. The entire projector, including an arc lamp illumination, relay, and projection system, has a height of 48 mm and a footprint of 80 mm×132 mm. By using an overdriving f/2 .0 projection lens, the geometric efficiency of the projection system, ηgeo-pro, can be enhanced from 80% to 92%. Although, at the same time, the contrast decreased from 1200:1 to 500:1, this can be enhanced using an off-axis stop. By tuning the position of the stop, the contrast can be as high as 3700:1 for a ηgeo-pro equal to 90%. Using what we believe to be a novel prism design, we can get a very compact optical system with a high efficiency and good contrast ratio.

© 2007 Optical Society of America

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