三片式LCOS激光投影显示中复合散斑的抑制

研究了三片式硅基液晶（LCOS）激光投影显示中散斑的成因、类型及其光学统计特性，并分析了激光散斑大小的测量方法。在此基础上，选用旋转散射片来减少三片式LCOS激光投影系统中产生的复合散斑，并通过一系列的仿真和实验，使得该激光投影机对比度C降到了人眼可接受的范围4.2%。证明了旋转散射片的方法能有效减少复合散斑，具有光学结构简单、实施性强等优点。

Abstract

The factor, categorization and optical statistical characteristics of laser speckle shown in three-liquid crystal on silicon (LCOS) laser projection display system are studied, and a measuring method of laser speckle is analyzed. According to this, an optical method of rotating diffuser to reduce the composite speckle is applied. Through a series of simulations and experiments, the contrast of speckle patterns is reduced to 4.2%, which is acceptable to people′s eyes. So the method of rotating diffuser effectively suppresses laser speckle, which has simple optical structure and is easy to implement.

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刘红, 那柏林, 刘卫东, 王蔚生. 三片式LCOS激光投影显示中复合散斑的抑制[J]. 激光与光电子学进展, 2011, 48(4): 042201. Liu Hong, Na Bailin, Liu Weidong, Wang Weisheng. Composite Speckle Suppression in 3-LCOS Laser Projection Display[J]. Laser & Optoelectronics Progress, 2011, 48(4): 042201.

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