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Proceedings Paper

Design and fabrication of a trichroic prism for liquid crystal projection system
Author(s): Fang-Chuan Ho; Cheng-Wei Chu
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Paper Abstract

A thin film color selective beam splitter is designed and the method of fabrication is described through a single deposition process of a coating system onto the two lateral faces of a triangular prism with base angles of 60 deg. and 45 deg. respectively. Properly prepared contact prisms are then cemented onto the two coated surfaces to make all the incoming and outgoing light beams normal to the prism block. The tri-chromatic prism provides the primary colors R, G, B according to the sequence that the red color is first reflected when the modulated white beam is incident at 30 deg. onto the dichroic filter deposited on the lateral face with the base of 60 deg., and then the rest part of the spectrum is incident at the other dichroic filter of the system at 45 deg. to get the blue and green beams separated. Color performances of the system from the thin film filters constructed with TiO2 and Al2O3 as the high and low index layers respectively are analyzed. The advantages to use the tri-color prism block in a projection device with reflective liquid crystal light valves are discussed.

Paper Details

Date Published: 25 April 2000
PDF: 9 pages
Proc. SPIE 3954, Projection Displays 2000: Sixth in a Series, (25 April 2000); doi: 10.1117/12.383384
Show Author Affiliations
Fang-Chuan Ho, Industrial Technology Research Institute (Taiwan)
Cheng-Wei Chu, Industrial Technology Research Institute (Taiwan)

Published in SPIE Proceedings Vol. 3954:
Projection Displays 2000: Sixth in a Series
Ming Hsien Wu, Editor(s)

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