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Proceedings Paper

High-efficiency metal halide lighting systems for compact LCD projectors
Author(s): Charles N. Stewart; Douglas M. Rutan; Daniel J. Savage
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Paper Abstract

Compact LCD projectors require a high efficiency light source that has the smallest possible spatial extent. The objective of the lamp design must be to preserve the system etendue to ensure excellent screen illuminance. We present the results of the development of projection lighting systems that produce 1,500 to 3,000 lumens, have luminous efficacious of >= 1m/W and source sizes of <EQ 1.2 mm. Results of statistically designed experiments on the lamp design parameters and design parameters of the lamp/ballast systems essential for rapid start, restart, and long life will be discussed. These design studies result in compact efficient systems. 3D luminance results - both model and experiment - will be discussed. The result of our studies is a better understanding of the factors impacting long life, high efficiency, metal halide lamps with very small source sizes. We have identified a series of designs for lamp/ballast systems that give the user an option of performance sets. We will describe recent work on the design and characterization of a long life 50 Watt, 1.2 m arc gap metal halide lighting system that produces 3,200 lumens. A theoretical characterization of the optical efficiency of an arbitrary projection optical system through discussion of the arc efficiency and the system etendue will be presented.

Paper Details

Date Published: 8 May 1997
PDF: 8 pages
Proc. SPIE 3013, Projection Displays III, (8 May 1997); doi: 10.1117/12.273883
Show Author Affiliations
Charles N. Stewart, Welch Allyn, Inc. (United States)
Douglas M. Rutan, Welch Allyn, Inc. (United States)
Daniel J. Savage, Welch Allyn, Inc. (United States)


Published in SPIE Proceedings Vol. 3013:
Projection Displays III
Ming Hsien Wu, Editor(s)

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