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Related Experiment Videos

Portable digital micromirror device projector using a prism.

Jui-Wen Pan1, Chih-Ming Wang, Wen-Shing Sun

  • 1Department of Optics and Photonics, National Central University, Jhongli 32001, Taiwan. rwpan@ios.ncu.edu.tw

Applied Optics
|August 7, 2007
PubMed
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A novel ultrasmall total internal reflection prism enables compact Digital Micromirror Device projectors. This design achieves high geometric efficiency and contrast, ideal for portable projection systems.

Area of Science:

  • Optics and Photonics
  • Microdisplay Technology

Background:

  • Digital Micromirror Device (DMD) projectors require compact optical systems.
  • Traditional designs face limitations in size, efficiency, and contrast.

Purpose of the Study:

  • To introduce a novel, ultrasmall total internal reflection prism for pocket-sized DMD projectors.
  • To enhance the geometric efficiency and contrast ratio of the projection system.

Main Methods:

  • Designed and implemented an ultrasmall total internal reflection prism (29 mm x 22 mm x 24 mm, 19.5 g).
  • Utilized an overdriving f/2.0 projection lens and an off-axis stop.
  • Integrated the prism into a compact projector system (48 mm height, 80 mm x 132 mm footprint).

Main Results:

Related Experiment Videos

  • Achieved a geometric efficiency of 92%, an increase from 80%.
  • Initial contrast decreased from 1200:1 to 500:1 but was enhanced to 3700:1 using an off-axis stop.
  • Demonstrated a compact optical system with high efficiency and contrast.

Conclusions:

  • The novel prism design facilitates highly efficient and compact DMD projectors.
  • The system offers a balance between geometric efficiency and contrast ratio through innovative optical solutions.
  • This advancement is suitable for portable and high-performance projection applications.