说明：  关于LED显示屏部分的介绍。如果你需要了解这方面的知识，正好是你所需要的内容。系统的介绍了LED点阵显示的原理与技术要点。
(On the LED display part of the introduction. If you need to know this knowledge is just what you need. Systematic introduction to the principles and techniques of LED dot matrix display.)