Kuratomi Yuhei, Sekiya Kazuo, Satoh Hiroaki, Tomiyama Tatsuhiro, Kawakami Tohru, Katagiri Baku, Suzuki Yoshito, Uchida Tatsuo
Department of Electronics, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan.
J Opt Soc Am A Opt Image Sci Vis. 2010 Aug 1;27(8):1812-7. doi: 10.1364/JOSAA.27.001812.
Recently, a practical method of speckle reduction in laser rear projection displays that uses an optical system with a small moving diffuser has attracted much attention. In this paper, a model of the speckle generation and reduction mechanism in the system is presented. We investigated the speckle, focusing on the physical aspects of its generation, rather than treating it statistically. We found that the granularity of the speckle patterns generated by the small diffuser corresponded to the size of the coherent regions on the projection screen. This determined the efficiency of the speckle reduction when the small diffuser was rotated.
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