介绍了传统脉宽调制(PWM)灰度算法以及其存在的缺陷, 提出了一种增强型的PWM灰度算法, 基于人眼的视觉特性将时间子场重新分布。搭建了基于FPGA的数字光处理(DLP)投影显示系统, 给出了系统的框图和工作原理。并使用该系统验证了算法的可行性。该投影系统植入增强型PWM算法后数字微镜器件(DMD)微镜开关频率明显提高, 相比于传统算法图像显示效果明显提高, 人眼的闪烁感明显降低, 动态图像的稳定性大幅度提高。

The traditional PWM algorithm and the flaws are introduced, the time sub-field is redistributed according to the human visual characteristics and an advanced PWM gray level algorithm is put forward. A DLP projector system is built based on FPGA and the block diagram and working principles are given. The feasibility of the algorithm is proved in the system. It is shown that after applying the enhanced PWM algorithm, the DMD switching frequency and the picture display are highly improved, the blink sensation is reduced and the stability of moving pictures are enhanced substantially.