LED广告牌显示系统设计方法

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西京学院学士学位论文 1 LED显示系统研究

摘 要 进入21世纪,LED显示成为显示屏主要发展趋势,越来越多的应用到各行各业,各种广告传媒都采用LED显示。随着LED显示技术的进一步提升,LED显示将带来巨大的社会效益和丰富的经济效益。 本文研究了用单片机控制单色显示屏的方法,并对LED显示单元模块如何进行信号扫描、列信号控制及驱动问题进行了分析。本文设计的显示模块包含100*80的LED点阵显示屏、一个单片机控制系统和行列扫描及驱动电路。在此基础上,采用分布式连接,通过多个单片机将多个显示模块拼接,可以实现一个大尺寸LED广告显示牌。论文给出了显示系统的结构框图和电气原理图,并给出了控制软件流程图。

关键词:LED;单片机;显示屏;驱动;扫描

西京学院学士学位论文

2 Abstract

Research on LED Display System LED display takes the main role in the large screen fields when entering 21st century. More and more applications various can be found in every walk of life. With the LED display technology improvement, it will bring huge social efficiency and rich economic efficiency.

Single chip microprocessor controlled monochromatic display method is studied in this article. And how to realize row signal scanning ,column control and driving methods in a display module is analyzed. A display module with the 100*80 LEDs is designed which includes a Single chip microprocessor control system and a row signal scanning and driving circuit. Based on this, a distributed microprocessor system is built to make several display modules form a large size

LED screen. Display control system structure diagram and its electric principle diagram are shown . The display system software is given also.

Key Words: LED;Single chip microprocessor;Display;Driver;Scanning

目录 中文摘要 ······························································································· 1 西京学院学士学位论文 3 英文摘要 ································································ 错误!未定义书签。 1绪论 ···································································································· 4 1.1 前言 ···························································································· 5 1.2 国内外LED显示屏的研究现状 ················································ 6 1.3 LED显示屏的发展趋势 ····························································· 7 1.4 本课题主要研究内容 ································································· 8 2 LED广告牌显示系统设计方法 ·························································· 8 2.1 设计任务 ···················································································· 8 2.2 LED点阵显示屏驱动设计 ························································· 9 2.2.1 常规驱动电路的设计 ························································ 9 2.2.2 点阵显示屏显示 ······························································ 10 2.3 设计方案 ·················································································· 10 3 硬件设计 ··························································································· 12 3.1硬件框图介绍············································································ 12 3.2系统主控电路············································································ 13 3.3系统主要部分介绍 ···································································· 14 3.3.1电源部分: ······································································· 14 3.3.2单片机部分: ··································································· 14 3.3.3行驱动部分: ··································································· 15 3.3.4列驱动部分: ··································································· 16 3.3.5显示屏部分: ······································································ 16 4主要芯片介绍 ···················································································· 17 西京学院学士学位论文 4 4.1 51系列单片机简介 ··································································· 17 4.2 89C51单片机 ············································································ 20 4.3驱动芯片 ··················································································· 22 5 LED显示屏的实现技术 ···································································· 26 6软件设计 ···························································································· 27 6.1 程序流程图 ·············································································· 27 6.2 程序代码 ·················································································· 28 7 结论与展望 ······················································································· 31 8致 谢 ································································································ 32 9参考文献 ···························································································· 33

1 绪论 1.1 前言 社会日新月异的发展,人们的消费标准不断改变,户外灯箱、广告等更是扮演着越来越重要的宣传角色,不论是汽车站,火车站,股市交易市场,娱乐门牌,