目 录
摘 要................................................................................................................................I
绪 论 ...............................................................................................................................1
第 1 章 LED 显示屏的发展背景及目标 ......................................................................2
1.1 LED 显示屏的发展背景及国内外研究现状 ....................................................2
1.2 设计目标及采取的方案 ....................................................................................2
1.2.1 本设计的目标 ..........................................................................................2
1.2.2 本设计采取的方案 ..................................................................................3
1.3 文章的结构安排 ................................................................................................3
第 2 章 系统总体分析 ...................................................................................................4
2.1 显示部分 ............................................................................................................4
2.2 驱动电路的选择 ................................................................................................4
2.3 电源模块选择 ....................................................................................................5
2.4 工作原理 ............................................................................................................5
第 3 章 系统硬件设计 ...................................................................................................6
3.1 AT89C51 芯片的介绍 ........................................................................................6
3.2 时钟电路 ............................................................................................................9
3.3 复位电路 ..........................................................................................................10
3.4 键盘模块设计 ..................................................................................................10
3.5 点阵式汉字 LED 显示屏设计 .........................................................................11
3.5.1 LED 的特点以及常用的参数 ...............................................................11
3.5.2 LED 电子显示屏 ...................................................................................12
3.5.3 LED 电子显示屏显示字符原理 ...........................................................13
3.6.4 汉字显示的原理 ...................................................................................14
3.7 整体电路 ..........................................................................................................17
第 4 章 系统软件设计 .................................................................................................18
4.1 主程序设计如图 4.1 所示 ...............................................................................18
4.2 子程序设计 ......................................................................................................22
结 论 .............................................................................................................................25
参考文献 .........................................................................................................................26