本文采用PIC 16F877A单片机为主要核心控制元件，设计了一个32×32 LED点阵模块的书写显示屏。它主要由光笔模块和点阵显示模块组成，光笔模块利用光敏电阻的光电特性，实现微亮检测功能。-Control as the main core components, design a 3232 LED dot matrix display module writing this article using PIC 16F877A microcontroller. It mainly consists of the optical the pen module and dot-matrix display module consisting module photoresistor photoelectric characteristics of light pen, micro-light detection function.