12 September 2014 Speckle reduction in projection display by controlling the spatial coherence of laser source
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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.
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Zhe Cui, Zhe Cui, Anting Wang, Anting Wang, Zi Wang, Zi Wang, Chun Gu, Chun Gu, Shulu Wang, Shulu Wang, Hai Ming, Hai Ming, Weizhi Du, 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); doi: 10.1117/12.2069360; https://doi.org/10.1117/12.2069360
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