Design and fabrication of a trichroic prism for liquid crystal projection system

Fang-Chuan Ho; Cheng-Wei Chu

doi:10.1117/12.383384

25 April 2000 Design and fabrication of a trichroic prism for liquid crystal projection system

Fang-Chuan Ho, Cheng-Wei Chu

Proceedings Volume 3954, Projection Displays 2000: Sixth in a Series; (2000) https://doi.org/10.1117/12.383384
Event: Electronic Imaging, 2000, San Jose, CA, United States

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.

Citation Download Citation

Fang-Chuan Ho and Cheng-Wei Chu "Design and fabrication of a trichroic prism for liquid crystal projection system", Proc. SPIE 3954, Projection Displays 2000: Sixth in a Series, (25 April 2000); https://doi.org/10.1117/12.383384

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KEYWORDS

Prisms

Optical filters

Thin films

Liquid crystals

Light valves

Reflectivity

Projection systems

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