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Proceedings Paper

Speckle reduction in laser projection display by modulating illumination light
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Paper Abstract

The use of lasers in a projection display enables the creation of vibrant images with extensive color coverage. By adding a phase modulators in illumination systems and keeping the most part structures of the classic projection, speckle on the screen and retinas of the observers were restrained. The speckle's form and restraining were simulated. It was obtained form simulations that the contrasts of residual speckle on screen and on retinas are 0.0107 and 0.0132. The simulation proves that speckle on screen and on retinas can be suppressed by phase modulation of the illumination light in projection. It also indicated that the numerical aperture of projector affect the residual speckle on retinas. Experiments of speckle restraining were performed. It confirmed the results of the simulations.

Paper Details

Date Published: 22 February 2008
PDF: 9 pages
Proc. SPIE 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology, 662229 (22 February 2008); doi: 10.1117/12.790954
Show Author Affiliations
Zhijie Liao, Institute of Optics and Electronics (China)
Graduate School of the Chinese Academy of Sciences (China)
Tingwen Xing, Institute of Optics and Electronics (China)
Guanxiao Cheng, Institute of Optics and Electronics (China)
Graduate School of the Chinese Academy of Sciences (China)
Wumei Lin, Institute of Optics and Electronics (China)


Published in SPIE Proceedings Vol. 6622:
International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology

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