Cost, brightness, and lifespan trade-offs of light sources for small format display systems

Dah Yu Cheng; Vadim J. Konings

doi:10.1117/12.273884

8 May 1997 Cost, brightness, and lifespan trade-offs of light sources for small format display systems

Dah Yu Cheng, Vadim J. Konings

Proceedings Volume 3013, Projection Displays III; (1997) https://doi.org/10.1117/12.273884
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

In this paper, works on optimization oflight sources for small format projection systems are reported such as DMD, TRLCD, and ITT systems. Results using short arc Xenon lamps versus modest gap width HID and relatively long gap width RID lamps are compared with several designs of the Compound Orthogonal Parabolic Reflector (COPR®), reflector systems, and with relatively deep elliptical reflectors. It can be shown that the diameter ofthe COPR® reflector is independent of the resulting focal spot size, but the gap width is a function ofthe spot size. For intensity or total light for a given iamp, the COPR® is 60% better than the elliptical reflector. If aperture size is not important, than the comparison is moot. A new concept of imaging ray tracing versus classical point and ray emission method are compared specifically for the evaluation of relative intensity of "light" through a given aperture dimension. It can be demonstrated that the imaging method is much more efficient to provide first order results for optical designers. A hyperboloid ray concentrator is introduced as a method to relax the small aperture requirement for small format imaging systems. Cost trade-off will be provided on typical, currently available lamps.

Citation Download Citation

Dah Yu Cheng and Vadim J. Konings "Cost, brightness, and lifespan trade-offs of light sources for small format display systems", Proc. SPIE 3013, Projection Displays III, (8 May 1997); https://doi.org/10.1117/12.273884

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