22 February 2008 Speckle reduction in laser projection display by modulating illumination light
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Proceedings Volume 6622, International Symposium on Photoelectronic Detection and Imaging 2007: Laser, Ultraviolet, and Terahertz Technology; 662229 (2008) https://doi.org/10.1117/12.790954
Event: International Symposium on Photoelectronic Detection and Imaging: Technology and Applications 2007, 2007, Beijing, China
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.
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Zhijie Liao, Tingwen Xing, Guanxiao Cheng, Wumei Lin, "Speckle reduction in laser projection display by modulating illumination light", 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; https://doi.org/10.1117/12.790954
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