基于单片机的led汉字点阵显示屏的设计（毕业论文）.doc

毕 业 设 计 设计题目：基于单片机的LED汉字点阵显示屏的设计 基于单片机的LED汉字点阵显示屏单片LED点阵显示屏Proteus仿真显示屏驱动电路LED dot matrix display Chinese characters Based on MCU Abstract This article introduces the design and implementation of the dot matrix display of LED Chinese characters. It introduces the principle of display and the design of display drive circuit through Proteus simulation. The results of simulation provides theory basis for the welding and debugging of the actual hardware circuit. It controls the operation of the whole system through the MCU，it displays Chinese information by progressive scan, it mainly divided into three sections: PC software parts, control part, display screen of LED dot matrix. PC software parts mainly are writed through VB software, it writes a interface of the font conversion and sending, so as to achieve PC and MCU communications; The main chip of the control part is STC89C52RC,it is the core of the system, and then downloaded the C programming language to MCU to control its pins; The display screen of LED dot matrix includes drive circuit and display screen,74LS138 decoder controls the line scanning,74HC595(shift register that outputs eight parallel data) controls the column scanning. Because of human visual retention phenomenon, driving circuit achieves the display of the Chinese characters through the ranks of the dynamic control. Compared with LED dot matrix display of Chinese characters based on MCU, it can display dynamic information, change information at any time, compared with video advertising, low cost, arbitrary of the information display site is high. So whether commercial advertising or general information announcement, the display screen of LED is applied wildly. Keywords: MCU ; display screen of LED dot matrix; Proteus simulation; drive circuit of display screen 目 录 1 引言 1 1.1课题背景 1 1.2系统功能概述 1 1.2.1总体设计框架 1 1.2.2上位机(PC) 2 1.2.3串行通信接收器 2 1.2.4单片机 3 1.2.5外扩存储器 3 1.2.6 LED显示屏行列驱动电路 3 1.2.7 LED点阵显示屏 3 2 Proteus模拟仿真 4 2.1 Proteus介绍 4 2.2 Keil u