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A new technique for speckle noise reduction of laser projection displays using waveplates

机译：利用波片降低激光投影显示器斑点噪声的新技术

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In laser projection displays, countermeasure technique against glares on the screen called speckle noise is one of the focuses. In the experiments, a quarter-waveplate with slow axis rotated by 45 degrees against the polarization axis of the incident green laser source was inserted into the optical path of our laser projection display system. Only in such a setup, an enough coherence alleviation was attained. We have also carried out quantitative evaluations of the speckle noise by overlaying the projected images using a CCD camera on the histogram-based estimations of speckle noise intensities. Noise reduction of about 20% was accomplished.
机译：在激光投影显示器中，针对屏幕眩光的对策技术（称为斑点噪声）是重点之一。在实验中，将慢轴相对于入射绿色激光源的偏振轴旋转了45度的四分之一波片插入了我们的激光投影显示系统的光路。仅在这样的设置中，才能获得足够的连贯性缓解。我们还通过在基于直方图的斑点噪声强度估计值上使用CCD相机覆盖投影图像，对斑点噪声进行了定量评估。噪音降低了约20％。

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