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Proceedings Paper

Speckle reduction in projection display by controlling the spatial coherence of laser source
Author(s): Zhe Cui; Anting Wang; Zi Wang; Chun Gu; Shulu Wang; Hai Ming; Weizhi Du
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Paper Abstract

In this paper, the relationship between the spatial coherence of light field and the speckle contrast in a laser based projection display system is studied under the consideration of human visual percept. By using a varifocal liquid-crystal lens and a monochromatic CCD, a system which is used for simulating the human eye is set up to record the speckle pattern. An efficient method for controlling the spatial coherence by using a dielectric elastomer actuator (DEA) is proposed. The results show that the total efficiency for energy utilization is more than 60% during our experiment. When the distance between the observer and the screen is large enough (<3 meters), the speckle contrast can be eliminated well at last (<4%) and the observer won’t feel the speckle phenomenon.

Paper Details

Date Published: 12 September 2014
PDF: 9 pages
Proc. SPIE 9193, Novel Optical Systems Design and Optimization XVII, 91931M (12 September 2014); doi: 10.1117/12.2069360
Show Author Affiliations
Zhe Cui, Univ. of Science and Technology of China (China)
Anting Wang, Univ. of Science and Technology of China (China)
Zi Wang, Univ. of Science and Technology of China (China)
Chun Gu, Univ. of Science and Technology of China (China)
Shulu Wang, Univ. of Science and Technology of China (China)
Hai Ming, Univ. of Science and Technology of China (China)
Weizhi Du, Univ. of Science and Technology of China (China)


Published in SPIE Proceedings Vol. 9193:
Novel Optical Systems Design and Optimization XVII
G. Groot Gregory; Arthur J. Davis, Editor(s)

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