发布时间 : 星期一 文章（毕设论文）LED显示系统设计更新完毕开始阅读8a030bf526fff705cc170a40
毕业设计（论文）
题 目： LED显示系统设计 姓 名： 孙良平 学 号： 0904010116
指导教师(职称)： 郝毫毫（副教授） 班 级： 09测控01班 所 在 学 院： 电气信息学院
专 业： 测控技术与仪器
2013年 5月
武汉工程大学 毕业设计（论文）
目录
目录 .................................................................................................................................................................. I 摘 要 ............................................................................................................................................................. II ABSTRACT ....................................................................................................................................................... III 第一章 绪论 .................................................................................................................................................. 1 1.1 课题背景 ................................................................................................................................................. 1 1.2 我国LED产业发展现状 .......................................................................................................................... 2 1.3 LED显示屏的分类 .................................................................................................................................. 2 1.4 LED显示屏的发展趋势 ........................................................................................................................... 3 1.5 选题意义 ................................................................................................................................................. 3 第二章 总体方案 .......................................................................................................................................... 5 2.1 方案概述 ................................................................................................................................................. 5 2.2 显示屏主控制器 ..................................................................................................................................... 5 2.3 LED点阵显示屏 ...................................................................................................................................... 6 2.4 LED驱动电路 .......................................................................................................................................... 7 2.5 总体设计框图 ......................................................................................................................................... 8 第三章 系统硬件设计 ................................................................................................................................... 9 3.1 单片机概述 ............................................................................................................................................. 9 3.2 单片机最小系统设计 ............................................................................................................................ 13 3.3 单片机串行通信技术 ............................................................................................................................ 15 3.4 74LS154行驱动电路 ............................................................................................................................. 17 3.5 74LS595列驱动电路 ............................................................................................................................. 18 第四章 系统模拟仿真 ................................................................................................................................. 21 4.1 PROTEUS 介绍 ...................................................................................................................................... 21 4.2 KEIL U VISION3 介绍 ............................................................................................................................. 22 4.3 KEIL U VISION3 与PROTEUS 的连接 .................................................................................................... 23 总 结 ......................................................................................................................................................... 24 致 谢 ......................................................................................................................................................... 25 参考文献 ....................................................................................................................................................... 26 附录一 PROTUES仿真 ................................................................................................................................ 27 附录二 设计程序 ........................................................................................................................................ 28
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武汉工程大学 毕业设计（论文）
摘 要
本文介绍了 LED汉字点阵显示屏的设计及实现过程。通过 Proteus仿真详细介绍了显示的原理和显示屏驱动电路的设计，仿真效果的实现为后续实际硬件电路的焊接和调试提供了理论基础。
该系统通过单片机来控制整个系统的运行，采用逐行扫描的方式实现汉字的显示，主要分为三大部分：软件部分、控制部分、LED 点阵显示屏。软件部分主要通过Keil软件编写程序并与Protues联调实现仿真。控制部分主芯片是 ATM89C51，是系统的核心，再利用 C 语言编程实现对单片机各引脚的控制；LED 点阵显示屏包括驱动电路和显示屏，74LS154译码器输出控制显示屏的行扫描，74LS595（八位并行输出移位寄存器）控制显示屏的列，由于人眼视觉的滞留现象，行列驱动电路通过动态控制便实现了汉字的显示。
基于单片机的 LED点阵显示屏与普通的平面静态广告相比，可以动态显示信息，可以随时更换显示信息，与视频广告相比，造价低，信息显示地点随意性高。因此，无论商业广告，还是一般的信息公告显示，LED 点阵显示屏都有着广泛的应用。
关键词： 单片机 ；LED 点阵显示屏 ；Proteus 仿真 ； 显示屏驱动电路
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武汉工程大学 毕业设计（论文）
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: software parts, Software part mainly through keil software programming and simulation protues alignment and implementation; The main chip of the control part is ATM89C51, 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, 74LS154 decoder controls the line scanning, 74LS595(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
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