Study on speckle problem in semiconductor laser display

Zhihao Quan, Jie Liu, Jian-Cheng Zhong
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Abstract

As a new generation of display technology, Laser displays a wide range of color gamut, high brightness, and other characteristics. However, as a highly coherent light source, laser speckle will be generated by the interference phenomenon of the reflected light or transmitted light of different surface elements after the incident on the surface of the object, which will seriously reduce the quality of the display image. Therefore, the suppression of laser speckle and the reduction of speckle contrast are always important problems in laser display technology. Here, we presented a speckle suppression scheme suitable for projector optical systems. Speckle suppression by spectral broadening and speckle suppression by superposition of multiple independent and unrelated speckle patterns are included in the scheme. Then, the feasibility of the scheme was verified by simulation. On this basis, the projector system was built. The speckle suppression scheme was added, and the effect of the scheme on speckle contrast was verified by actual measurement, and the speckle contrast was successfully reduced from 0.129 to 0.041, which was difficult for human eyes to distinguish.
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半导体激光显示中散斑问题的研究
作为新一代的显示技术,激光显示具有色域范围广、亮度高等特点。但激光作为一种高度相干的光源,不同表面元素的反射光或透射光入射到物体表面后会产生干涉现象,会严重降低显示图像的质量。因此,抑制激光散斑和降低散斑对比度一直是激光显示技术中的重要问题。本文提出了一种适用于投影光学系统的散斑抑制方案。该方案包括通过谱展宽抑制散斑和通过叠加多个独立和不相关的散斑来抑制散斑。然后,通过仿真验证了方案的可行性。在此基础上,搭建了投影机系统。加入了散斑抑制方案,并通过实际测量验证了该方案对散斑对比度的影响,成功地将人眼难以分辨的散斑对比度从0.129降低到0.041。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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