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Trichroic prism assembly for separating and recombining colors in a compact projection display
H S Kwok1, P W Cheng, H C Huang
1Center for Display Research, Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong, China. eekwok@ust.hk
Applied Optics
|March 14, 2008
Summary
A novel trichroic prism assembly offers low polarization dependence for optical coatings. This design enables efficient color separation and recombination, ideal for compact projectors.
Area of Science:
- Optics and Photonics
- Optical Engineering
Background:
- Polarization dependence in optical coatings can limit performance in color separation and recombination.
- Existing trichroic prism designs may exhibit significant polarization effects.
Purpose of the Study:
- To propose and demonstrate a new trichroic prism assembly design.
- To achieve low polarization dependence in optical coating reflectance spectra.
- To enable versatile use in color separation and recombination with polarization change.
Main Methods:
- Design and fabrication of a novel trichroic prism assembly.
- Characterization of reflectance spectra for s- and p-polarization.
- Evaluation of the assembly's performance in color separation and recombination.
Main Results:
- The proposed trichroic prism assembly demonstrates significantly low s- and p-polarization dependence.
- The optical coatings exhibit consistent reflectance across polarizations.
- Successful demonstration of color separation and recombination with polarization change.
Conclusions:
- The new trichroic prism assembly design offers superior performance due to minimal polarization dependence.
- This design is particularly advantageous for compact color projectors utilizing reflective liquid-crystal light valves.
- The versatility of the design supports advanced optical system integration.
