title: Speckle reduction mechanism in laser rear projection displays using a small moving diffuser.
abstract: 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.
authors.affiliation: Department of Electronics, Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan. yuhei@gamma.ocn.ne.jp
authors.forename: Yuhei
authors.initials: Y
authors.lastname: Kuratomi
authors.forename: Kazuo
authors.initials: K
authors.lastname: Sekiya
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Satoh
authors.forename: Tatsuhiro
authors.initials: T
authors.lastname: Tomiyama
authors.forename: Tohru
authors.initials: T
authors.lastname: Kawakami
authors.forename: Baku
authors.initials: B
authors.lastname: Katagiri
authors.forename: Yoshito
authors.initials: Y
authors.lastname: Suzuki
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Uchida