微型光机电二维扫描镜的 Lissajous与 Linescan扫描对比

摘要

In laser scanning display systems (LSDs),the Micro-Opto-Electro-Mechanical System (MOEMS) has mainly two patterns for laser beam spatial modulation ,Lissajous and Linescan .In order to analyze the characteristics of each model ,and the advantages and disadvantages of different patterns ,we made comparative study on two indicators of display resolution and track uniformity .According to the least pixel division method simulated,the minimum MOEMS fast axis frequency requirements of Lissajous pattern is about 57% higher than that of Linescan pattern .Simulation was made to the same picture under different pattern based on Matlab.The result indicates that the Lissajous scanning track presents an uneven characteristic of dense upper and lower edges and sparse center ,whereas the Linescan scanning track presents a trumpet-shaped uneven characteristic .%在激光扫描显示系统（ LSDs）中，MOEMS对激光束的空间调制主要分为Lissajous与Linescan两种模式。为了深入分析各模式的扫描特点，比较各模式之间的优缺，针对每种模式提出了扫描显示分辨率和轨迹均匀性这两个指标进行对比研究。按照仿真分析得出的最小像元划分方法，相同分辨率下，Lissajous模式对MOEMS快轴频率的最低要求要比Linescan模式大约高57％。另外，利用Matlab对不同MOEMS模式进行同一图像的扫描仿真，仿真结果表明，Lissajous扫描轨迹呈现出上下边缘密、中心疏的不均匀特点，而Linescan扫描轨迹则呈现出喇叭状不均匀特点。