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Proceedings Paper

Effective speckle noise reduction of laser projection displays by high frequency driving current superposition for blue, red, and direct green emission laser diode
Author(s): Yoshifumi Kouno; Kouhei Kamata; Kenta Chihaya; Wakao Sasaki; Hiroki Matsubara; Atsuya Hirano; Kenji Nagashima
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Paper Abstract

In this work, we have achieved for the first time an effective speckle noise reduction simply by means of just high frequency LD driving current superposition for an ultla compact micro-electro-mechanical-systems (MEMS) based high resolution scanning beam RGB-laser projectors including the direct green emission LD. In the experiments, we have carried out quantitative evaluations of the speckle noise by overlaying the projected images using a CCD camera with histogram based estimation of speckle noise intensities. Moreover, we have examined the reduction of granular images seen by humane eyes in higher ratios in color stereo image pairs using double-stimulus continuous-quality scale (DSCQS) method. As a consequence, the noise reduction rate of 53.5% for the red laser diode, 80.1% for the green laser diode, and 50.3% for the blue laser diode was attained with histogram based estimation, and the image quality was also enhanced by speckle noise reduction with all RGB LD's using DSCQS method. Moreover, we have also investigated the noise reduction mechanisms in these RGB LD's in relation with the relaxation oscillation frequencies from viewpoint of chaotic multi-mode oscillations with existence of optical feedback.

Paper Details

Date Published: 18 December 2012
PDF: 10 pages
Proc. SPIE 8550, Optical Systems Design 2012, 85501I (18 December 2012); doi: 10.1117/12.981343
Show Author Affiliations
Yoshifumi Kouno, Doshisha Univ. (Japan)
Kouhei Kamata, Doshisha Univ. (Japan)
Kenta Chihaya, Doshisha Univ. (Japan)
Wakao Sasaki, Doshisha Univ. (Japan)
Hiroki Matsubara, Funai Electric Co., Ltd. (Japan)
Atsuya Hirano, Funai Electric Co., Ltd. (Japan)
Kenji Nagashima, Funai Electric Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 8550:
Optical Systems Design 2012
Laurent Mazuray; Daniel G. Smith; Jean-Luc M. Tissot; Tina E. Kidger; Frank Wyrowski; Stuart David; Rolf Wartmann; Jeffrey M. Raynor; Andrew P. Wood; Pablo Benítez; Andreas Erdmann; Marta C. de la Fuente, Editor(s)

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