27 November 2012 Effect of the projection lens on speckle contrast measurement in laser projection displays
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Abstract
Laser speckle degrades image quality in laser displays. The speckle contrast needs to be correctly evaluated in designing laser displays. In this paper, a moving small diffuser for speckle reduction is set up for laser projection display system. We demonstrate the effect of the projection lens on speckle contrast under the scenarios of free-space and image geometry measurement with different configurations. The results show the speckle contrast in free-space geometry is measured as about 74.16% without projection lens and 60.74% with projection lens for the static diffuser, which are reduced to 2.75% when the diffuser moves for both with and without projection lens. In the imaging geometry, the moving diffuser reduces the speckle contrast from 83.22% to 9.61% without projection lens, and from 98.7% to 36.59% with projection lens.
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Meifang Xu, Meifang Xu, Wenhong Gao, Wenhong Gao, Yunbo Shi, Yunbo Shi, Pengfei Zhao, Pengfei Zhao, Jun Liu, Jun Liu, Xuyuan Chen, Xuyuan Chen, } "Effect of the projection lens on speckle contrast measurement in laser projection displays", Proc. SPIE 8560, LED and Display Technologies II, 85600D (27 November 2012); doi: 10.1117/12.999723; https://doi.org/10.1117/12.999723
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