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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 46, Iss. 22 — Aug. 1, 2007
  • pp: 5097–5102

Portable digital micromirror device projector using a prism

Jui-Wen Pan, Chih-Ming Wang, Wen-Shing Sun, and Jenq-Yang Chang  »View Author Affiliations

Applied Optics, Vol. 46, Issue 22, pp. 5097-5102 (2007)

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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, η g e o - p r o , 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 η g e o - p r o 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

OCIS Codes
(080.2740) Geometric optics : Geometric optical design
(220.2740) Optical design and fabrication : Geometric optical design
(230.5480) Optical devices : Prisms
(230.6120) Optical devices : Spatial light modulators

ToC Category:
Optical Design and Fabrication

Original Manuscript: February 5, 2007
Revised Manuscript: April 5, 2007
Manuscript Accepted: April 8, 2007
Published: July 9, 2007

Jui-Wen Pan, Chih-Ming Wang, Wen-Shing Sun, and Jenq-Yang Chang, "Portable digital micromirror device projector using a prism," Appl. Opt. 46, 5097-5102 (2007)

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