Abstract

Speckle and the compound speckle can be reduced by angle diversity. In laser projection displays, simple, low cost and efficient speckle reduction techniques require smart optical design. Using a MEMS scanner together with a condenser lens, laser beams with different illumination angles are obtained on the diffuser surface with low speckle contrast ratio (CR). After homogenizing within a rod integrator, the speckle field illuminates a display panel, and is projected onto the screen which forms the compound speckle. Characterization method to evaluate the compound speckle reduction efficiency is analyzed and discussed in a simplified optical system. The preliminary speckle reduction is demonstrated in a commercial projector where a 600 mW green laser has been used as the illumination source, and the compound speckle CR is brought down from 0.38 to 0.14.

© 2012 IEEE

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References

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2010 (4)

2009 (1)

2008 (1)

2006 (1)

S. C. Shin, S. S. Yoo, S. Y. Lee, C. Park, S. Park, J. W. Kwon, S. Lee, "Removal of hot spot speckle on laser projection screen using both the running screen and the rotating diffuser," Displays 27, 91-96 (2006).

2004 (1)

2000 (1)

L. Wang, T. Tschudi, M. Boeddinghaus, A. Elbert, T. Halldorsson, P. Pertursson, "Speckle reduction laser projections with ultrasonic waves," Opt. Eng. 39, 1659-1664 (2000).

1998 (1)

L. Wang, T. Tschudi, T. Halldorsson, P. R. Pertursson, "Speckle reduction laser projection systems by diffractive optical elements," Appl. Opt. 37, 1770-1775 (1998).

1993 (1)

B. Dingel, S. Kawata, "Speckle-free image a laser-diode microscope by using the optical feedback effect," Opt. Lett. 18, 549-551 (1993).

1990 (2)

C. Saloma, S. Kawata, S. Minami, "Laser-diode microscope that generates weakly speckled images," Opt. Lett. 15, 203-205 (1990).

C. Saloma, S. Kawata, S. Minami, "Speckle reduction by wavelength and space diversity using a semiconductor laser," Appl. Opt. 29, 741-742 (1990).

Appl. Opt. (3)

L. Wang, T. Tschudi, T. Halldorsson, P. R. Pertursson, "Speckle reduction laser projection systems by diffractive optical elements," Appl. Opt. 37, 1770-1775 (1998).

C. Saloma, S. Kawata, S. Minami, "Speckle reduction by wavelength and space diversity using a semiconductor laser," Appl. Opt. 29, 741-742 (1990).

M. N. Akram, Z. Tong, G. Ouyang, X. Chen, V. Kartashov, "Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror," Appl. Opt. 49, 3297-3304 (2010).

Appl. Opt. (3)

Displays (1)

S. C. Shin, S. S. Yoo, S. Y. Lee, C. Park, S. Park, J. W. Kwon, S. Lee, "Removal of hot spot speckle on laser projection screen using both the running screen and the rotating diffuser," Displays 27, 91-96 (2006).

Opt. Lett. (1)

B. Dingel, S. Kawata, "Speckle-free image a laser-diode microscope by using the optical feedback effect," Opt. Lett. 18, 549-551 (1993).

Opt. Eng. (1)

L. Wang, T. Tschudi, M. Boeddinghaus, A. Elbert, T. Halldorsson, P. Pertursson, "Speckle reduction laser projections with ultrasonic waves," Opt. Eng. 39, 1659-1664 (2000).

Opt. Lett. (4)

Other (4)

M. S. Brennesholtz, E. H. Stupp, Projection Displays (Wiley, 2008).

J. W. Goodman, Speckle Phenomena Optics: Theory and Applications (Roberts and Company Publishers, 2006).

F. Akio, O. Norihiro, S. Yoshifumi, I. Daisuke, W. Kazuya, I. Satoshi, T. Koshi, H. Shoji, "Effective speckle reduction laser projection displays," Proc. SPIE 6911 (2008) pp. 69110T1-69110T7.

J. I. Trisnadi, "Speckle contrast reduction laser projection displays," Proc. SPIE 4657 (2002) pp. 131-137.

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