Speckle reduction in projection display by controlling the spatial coherence of laser source

Zhe Cui; Anting Wang; Zi Wang; Chun Gu; Shulu Wang; Hai Ming; Weizhi Du

doi:10.1117/12.2069360

12 September 2014 Speckle reduction in projection display by controlling the spatial coherence of laser source

Zhe Cui, Anting Wang, Zi Wang, Chun Gu, Shulu Wang, Hai Ming, Weizhi Du

Proceedings Volume 9193, Novel Optical Systems Design and Optimization XVII; 91931M (2014) https://doi.org/10.1117/12.2069360
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

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.

Citation Download Citation

Zhe Cui, Anting Wang, Zi Wang, Chun Gu, Shulu Wang, Hai Ming, and Weizhi Du "Speckle reduction in projection display by controlling the spatial coherence of laser source", Proc. SPIE 9193, Novel Optical Systems Design and Optimization XVII, 91931M (12 September 2014); https://doi.org/10.1117/12.2069360

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KEYWORDS

Speckle

Spatial coherence

Imaging systems

Speckle pattern

Eye

Cameras

Liquid crystals

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