激光投影显示屏表面粗糙度的测量:激光投影显示屏表面粗糙度的测量
Surface Roughness Measurement of Screen for Laser Projection Display
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作 者:徐美芳[1] 石云波[1] 高文宏[1,2] 陈海洋[1,2]
Xu Meifang Shi Yunbo Gao Wenhong Chen Haiyang( Key Laboratory of Instrumentation Science & Dynamic Measurement, Ministry of Education, North University of China, Taiyuan , Shanxi 030051, China 2 Shanxi Ovision Optronics LTD, Taiyuan, Shanxi 030032, China)
机构地区:[1]中北大学仪器科学与动态测试教育部重点实验室和电子测试技术重点实验室,山西太原030051 [2]山西傲维光视光电股份有限公司,山西太原030032
出 处:《中国激光》 EI CSCD 2014年第1期 173-178页,共6页
Chinese Journal of Lasers
基 金:国家自然科学基金(61078036)、山西省重大专项(20111101045)、山西省自然科学基金(2011011015-2)、中北大学2011年校青年科学基金
摘 要: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5 cm×5 cm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137.60 μm,为设计有效降低激光散斑的投影显示屏提供了参考。
Display screen is an integral part of laser projection system. The surface roughness of screen directly affects speckle suppression based on angle diversity. The relation between speckle correlation and the surface roughness of measured screen is established by analyzing the speckle suppression method based on angle diversity. In the experiment, the incident angle is fixed to 1° and the angle increment is set to 0.0038°, which is a compromise between the sensitivities of surface roughness of the measured screen to those two factors. To avoid the effects of external perturbation and surface flatness on measured results, nine sub-regions are chosen in 5 cm×5 cm measured screen areas and measured results from these sub-regions are averaged, which effectively improves the measurement accuracy. The surface roughness for four screens determined by the proposed method are 235.80, 209.57, 132.24 and 137.60 μm, respectively, which provides a basis to design a projection display screen applied to effectively reduce laser speckle.
关键词:测量 激光投影 角度多样性 散斑相关性 表面粗糙度
measurement ; laser projection ; angular diversity ; speckle correlation ; surface roughness ;