LED点阵显示系统设计

论文编号:DZXX072  论文字数:10945,页数:51

摘  要
 随着社会文化的不断发展，人们的消费标准不断改变，户外灯箱广告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，还是学校都离不开它，然而传统的霓虹灯广告牌不论是在显示效果、耗电量还是可修改性上都无法满足当前社会的需求，传统的霓虹灯广告亟待改进，使用LED电子显示屏，有巨大的社会效益和经济效益[2]。
 本设计的题目是LED点阵显示系统设计，对LED显示模块单元如何进行行列信号控制及信号传输中的驱动问题进行了研究[5]。讨论了单片机控制系统中关键的数据处理以及发送问题，设计将采用AT89C51为主控制器，74HC595为列驱动，74HC138为行扫描及同步时钟输出等专用电路来实现点阵的滚动，停止，以及切换显示。该系统具有很好的稳定性和准确性。
 
关键词： LED，单片机，显示屏，驱动，扫描
Abstract
 Along with social culture fast development, People's expense standard changes unceasingly. The outdoor lamps advertisements are playing more and more important propaganda roles. It looks everywhere such as train stations, stock trading markets and schools. But the traditional neon light billboard is unable to satisfy current social the demand in demonstration effect. It has got a great disadvantage such as modifiability. The traditional neon light advertisement wants to be improved urgently. So using the LED electrical display monitor has got the huge social efficiency and the economic efficiency.      
     This design topic is LED Lattice display system design. It is about how to carry on the ranks signal control for the display module unit of LED and the signaling actuation question, also discussed in the monolithic integrated circuit control system the essential data processing as well as the transmission question, The design will use AT89C51 primarily controller, 74HC595 row actuation and 74HC138  line scan. As well as the synchronized clock outputs and so on allocated-use circuit to realize the lattice trundle, stops and cut demonstration. This system has the very good stability and the accuracy.

Keywords：LED；Supply chain management (SCM); Display；Driver；Scan

目 录
摘  要 I
Abstract II
第一章  绪  论 1
1.1课题背景及开发意义 1
1.2设计任务 1
第二章 方案论证 2
2.1控制系统的方案论证 2
2.2显示驱动模块的方案论证 2
2.3显示方式的方案论证 3
2.4接口方式选择 3
第三章 系统总体设计及主要芯片介绍 4
3.1总体结构设计 4
3.2 主要芯片介绍 4
3.2.1 AT89C51 4
3.2.2列驱动芯片74HC595 6
3.2.3行驱动芯片74LS138 7
3.2.4数据缓冲器74LS244 8
第四章 系统硬件设计 9
4.1单片机控制电路 9
4.2 列信号输出电路 9
4.3行选信号输出电路 10
4.4 行驱动电路 12
第五章 系统的软件设计 13
5.1显示驱动程序 13
5.2系统主程序 13
5.2.1左移显示子程序 14
5.2.2停止显示子程序 15
5.2.3切换显示子程序 16
5.3 汉字取模软件 18
第六章  毕业设计总结 21
致谢 22
参考文献 23
附录1 24
1整体电路图 24
2点阵控制电路 24
3点阵屏电路 25
4 八个行驱动芯片 25
5 元器件清单 25
附录2 27
1系统整体程序 27

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