Portable digital micromirror device projector using a prism

Jui Wen Pan, Chin Ming Wang, Wen Shing Sun, Jenq Yang Chang

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


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.

Original languageEnglish
Pages (from-to)5097-5102
Number of pages6
JournalApplied Optics
Issue number22
StatePublished - 1 Aug 2007


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