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Analysis of speckle‐reduction performance in a laser rear‐projection display using a small moving diffuser
Author(s) -
Kuratomi Yuhei,
Sekiya Kazuo,
Sato Hiroaki,
Kawakami Tohru,
Uchida Tatsuo
Publication year - 2010
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid18.12.1119
Subject(s) - speckle pattern , diffuser (optics) , optics , speckle noise , reduction (mathematics) , projection (relational algebra) , laser , computer science , materials science , physics , light source , mathematics , algorithm , geometry
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. Speckle in the system was investigated, focusing on the physical aspects of its generation rather than treating it statistically, and it was 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. By using these results, a method to estimate the performance of speckle reduction on the system was developed.