Abstract
A newly designed ultrasmall total internal reflection prism with a size of and weight of 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 and a footprint of . By using an overdriving projection lens, the geometric efficiency of the projection system, , 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 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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