单色显示屏的设计

电子机电论文编号:JD851 附开题报告,任务书,外文翻译,原理图及PCB, 论文字数:18364,页数:38

单色显示屏的设计
摘要
目次
1 绪 论 1
1.1 单色显示屏简介 1
1.2 LED显示屏的发展趋势及特点 2
2 系统整体设计方案论证 3
2.1 基本功能要求 3
2.2 显示模块方案认证 3
2.3 显示数据传输方案论证 3
3 系统硬件电路设计 4
3.1 稳压电源的设计 4
3.1.1 稳压电源原理 4
3.1.2稳压电源技术标 5
3.1.3 5V稳压电源的设计 6
3.2 单片机系统及外围电路 7
3.2.1 单片机的选择 7
3.2.2 AT89S51芯片简介 8
3.2.3 单片机系统及其外围电路 11
3.3 驱动电路的设计 11
3.3.1 74LS154芯片简介 11
3.3.2 列驱动电路 13
3.3.3 行驱动电路 14
3.4 点阵LED显示屏电路 15
3.5 单片机与上位机通信模块 17
3.5.1 MAX232芯片简介 17
3.5.2 单片机和上位机的通信电路 18
4系统程序设计及仿真调试 18
4.1 系统程序设计 18
4.2 系统软件程序调试 22
4.2.1 程序调试平台简介 22
4.2.2 程序调试过程及结果 22
4.3 系统整体Proteus仿真 23
4.3.1  Protues仿真平台简介 23
4.3.2 系统仿真 23
5 性能测试与分析 25
5.1 硬件调试 25
5.2 软件调试 25
5.3 性能分析 27
6 结束语 28
参 考 文 献 29
致 谢 30
附录一：硬件电路原理图 31
附录二：实物演示图 32
附录三：软件程序 33

摘  要
所设计的单色显示屏是以美国ATMEL公司生产的40脚单片机AT89S51为核心，介绍了以它为控制系统的LED点阵电子显示屏的动态设计和开发过程。通过该芯片控制一个74LS154和三个列驱动器ULN2003来驱动显示屏显示。该电子显示屏可以显示各种文字或单色图像，全屏能显示1个汉字，采用4块8 ×8点阵LED显示模块来组成16×16点阵显示模式。显示采用动态显示，使得图形或文字能够实现静止、移入移出等多种显示方式。文中详细介绍了LED点阵显示的硬件设计思路、硬件电路各个部分的功能及原理、相应软件的程序设计，以及使用说明等。
系统程序采用汇编语言进行编辑，通过编程控制各显示点对应LED阳极和阴极端的电平，就可以有效的控制各显示点的亮灭。所显示字符的点阵数据可以自行编写，也可从标准字库中提取。
LED显示以其组构方式灵活、显示稳定、功耗低、寿命长、技术成熟、成本低廉等特点在车站、证券所、运动场馆、交通干道及各种室内/外显示场合的信息发布，公益宣传，环境参数实时，重大活动倒计时等等得到广泛的应用。
测试结果表明，该系统显示误差小，性能稳定，结构合理，扩展能力强。
关键词： LED；点阵显示；单色；动态显示；汇编语言。

Design of monochrome display
Abstract
The monochrome display is designed with the 40-pin AT89S51 MCU (Micro Controller Unit) produced by the American ATMEL company as the core. This paper introduces its control system for electronic display LED dot matrix and monitor dynamic design and the development process. It drivers display to show through the control of one decoder 74LS154 and three row driver ULN2003 by the chip. The electronic screen can show all kinds of written or monochrome images. It shows one full screen display Chinese character and adopts four pieces of 8 x 8 dot-matrix LED display modules to form the 16x16 dot matrix display mode. The display adopts the dynamic show that can achieve the static graphic or text, shift in and out etc. This paper describes the hardware design of the LED dot matrix display and the principle function of the various parts of the circuit, the corresponding software program design and the notes in detail.
 System procedures used assembly language for editing and controls points indicated by the corresponding LED anode and overcast extreme level by programming so that we can effectively control the showed bright spots’ on and off. The shown characters data can prepare themselves or extracted from the standard font.
LED display feature is fabric flexibility, stability, low power consumption, long life, mature technology, low-cost features .It is widely used at the station, securities, sports venues, transportation corridors and various indoor / dissemination of information on foreign shows occasions, good publicity, real-time environmental parameters, countdown major activities etc.
  Test result shows that, this system shows error is small, the performance is stable, the structure is reasonable and it has expansion ability.
Key words：LED； Lattice display；Monochrome； Dynamic display； Assembly language.