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显示屏是激光投影显示系统的一部分,其表面粗糙度直接影响着基于角度多样性的激光散斑抑制效果。在角度多样性散斑抑制原理的基础上,建立了被测显示屏表面粗糙度与散斑图样之间的相关性之间的联系。对显示屏表面粗糙度对照射角度和角度变化的敏感程度权衡,实验中将入射角和角度变化量分别固定在1°和0.0038°。为避免外界微扰和测试屏表面不平度对测试结果的影响,通过对被测显示屏5cm×5cm测试区域中选择9个子区域的测试结果进行平均,有效提高了测试精度。运用提出的方法确定4种材质显示屏的表面粗糙度分别为235.80,209.57,132.24和137.60μm,为设计有效降低激光散斑的投影显示屏提供了参考。
The display is part of a laser projection display system whose surface roughness directly affects the laser speckle suppression based on angular diversity. Based on the principle of speckle reduction, a correlation between surface roughness and speckle pattern is established. On the screen surface roughness of the irradiation angle and angle sensitivity of the trade-off, the experiment will change the angle of incidence and angle were fixed at 1 ° and 0.0038 °. In order to avoid external perturbation and the influence of surface roughness on the test results, the test accuracy is improved by averaging the test results of 9 sub-regions in the test area of 5 cm × 5 cm. Using the proposed method to determine the surface roughness of the four kinds of material display screen were 235.80,209.57,132.24 and 137.60μm, which provides a reference for the design of a projection screen to effectively reduce the laser speckle.