基于单片机的led广告屏的设计.doc

摘　　要

　　　LED（Light Emitting Diode）行业作为一个已经成熟的产业，市场空间巨大，应用前景广阔。通过对LED技术的基本应用的研究可以进一步强化自身的专业技能和强化自己的动手设计能力。LED的特色之处一是节能（直接功耗，间接耗能），二是基本无电离辐射，三提高空间利用率。然而LED点阵显示屏的特点不仅仅于此，LED点阵显示屏用的是数码管，而数码管具有实用,便宜等优点。做出来的LED点阵显示很耐用。LED点阵显示屏之所以受到广泛重视而得到迅速发展，是与LED显示屏本身所具有的优点分不开的。LED点阵显示屏的发展前景极为广阔，目前正朝着更高亮度、更高耐气候性、更高的发光密度、更高的发光均匀性，可靠性、全色化方向发展。本文介绍了基于单片机STC12的16×16LED点阵汉字滚动显示屏的设计。其中着重介绍了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，以及详细的工作流程和使用说明。

　　　本文分为六部分，其中主要内容是系统总体分析，系统硬件设计，系统软件设计三部分。系统总体分析是基础；系统硬件设计是本文的关键及核心部分，该部分首先简单描述系统硬件工作原理，且附以系统硬件设计框图，论述了本次毕业设计所应用的各硬件接口技术和各个接口模块的功能及工作过程；软件设计是系统运行必不可少的部分。本文撰写的主导思想是软、硬件相结合，以硬件为基础，来进行各功能模块的设计。本设计实用性强、操作简单、扩展功能强。本此设计的显示屏的设计具有体积小、硬件少、电路结构简单及容易实现等优点。

关键词：单片机  LED  点阵  汉字显示

The Design of LED advertising screen Based on SCM

Abstract

LED (Light Emitting Diode) industry as a mature industry, the market is huge,  the application prospects is broad.Through the application of LED technology, the basic research could further strengthen our professional skills and strengthen our hands design capabilities.One special feature at the LED energy (power direct, indirect energy consumption), the second is almost no ionizing radiation, three improved space utilization.However, the characteristics of LED dot matrix display is not only here, LED dot matrix display using a digital, and digital tube has a practical, cost advantages.LED dot matrix display made out of very durable. LED dot matrix display by the wide attention and rapid development, with the LED display itself has the advantage inseparable. LED dot matrix display is extremely broad prospects for development, the current is moving higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, reliability, full color direction.This article describes the microcontroller-based STC12 of 16×16LED dot matrix character scrolling display design. Which focuses on the LED dot matrix display hardware design ideas, the hardware circuit functions of various parts and principles corresponding software program design, and detailed workflow and instructions for use. 

This paper is divided into six parts, of which the main contents of the overall system analysis, system hardware design, system software design three parts. Overall system analysis is the foundation; system hardware design is the key and core part of this paper, this section first briefly describe the system hardware works, and attached to the system hardware design diagram, discusses this graduation design applications and in all of the hardware interface technology Interface module functions and working process; software design is an essential part of system operation. The main idea of this writing is soft and hardware combination, hardware-based, for each functional module design. The design of practical, simple, powerful extension. The display is designed with a small, less hardware, circuit structure is simple and easy to implement.

Key Words：LED; Lattice; Chinese character demonstrates

目　　录

摘　　要 1

Abstract 2

引　　言 4

1 LED显示屏的介绍 5

1.1LED显示屏的发展背景及国内外研究现状 5

1.1.1LED显示屏的特点 6

1.1.2 LED显示屏的动态扫描 8

1.2LED显示屏的分类 8

1.2.2按使用方向分类 8

1.2.2按使用场合分类 9

1.2.3按发光点的直径分类 9

1.3LED显示屏的显示方案 9

1.4LED的作用及市场前景 10

1.4.1 LED显示屏的作用 10

1.4.2LED的市场前景 10

2系统的总体设计 10

2.1设计目标及采取的方案 10

2.1.1设计目标 10

2.1.2采取方案 11

2.2工作原理 11

2.3总体设计 12

3系统硬件设计 13

3.1各部分电路功能说明 13

3.2AT89C51芯片的简要介绍 15

3.3时钟电路的设计 17

3.4复位电路 18

3.5行驱动电路 19

3.6列驱动电路的设计 21

3.7电源电路的设计 22

3.8LED显示器的设计 22

3.8.1点阵式LED显示屏设计 22

3.8.2LED电子显示屏显示字符原理 23

3.9 汉字显示原理 24

3.9.1LED显示屏电路的设计 25

4系统软件的设计 27

4.1 主程序设计 27

5 系统制作与调试 31

5.1 Proteus软件简要介绍 31

5.2 仿真过程 33

5.3 硬件制作与调试 33

5.3.1 硬件电路板的制作 33

5.3.2 系统硬件调试 34

5.4 系统软件调试 34

结　　论 36

参 考 文 献 37

附 录 38

外文资料原文 38

外文资料译文 44

在 学 取 得 成 果 49

致　　谢 50