基于单片机的LED汉字显示屏设计设计

目 录

摘要 ···································································································· 2 ABSRACT ··························································································· 3 1 绪 论 ······························································································· 4

1.1 LED 显示屏的研究背景及意义 ······················································ 4 1.2 LED 显示屏的技术现状及发展趋势 ················································ 5 1.3 论文主要研究内容 ····································································· 5

1.3.1 问题的提出： ·································································· 5 1.3.2 论文的主要研究内容： ······················································ 5

2 设计要求 ··························································································· 6 2.1原理图设计 ··············································································· 6 2.2程序调计 ·················································································· 6 2.3 程序调试将设计完的程序输入，汇编，排除语法错误，生成*OBJ文件 ·· 6 3 功能要求 ··························································································· 6 4 方案论证 ··························································································· 7 5 系统硬件电路的设计 ··········································································· 8 6 系统程序设计 ···················································································· 11

6.1 初始化程序·············································································· 11 6.2 主程序 ···················································································· 11

6.3 显示子程序： ·········································································· 13 6.4 中断服务子程序： ···································································· 14 7 调试与性能分析 ················································································· 14 7.1 调试与测试·············································································· 14 7.2性能分析 ················································································· 14 8 控制源程序清单 ························································· 错误！未定义书签。 致 谢 ································································································ 18 参考文献 ····························································································· 19

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论文题目：基于单片机的LED汉字显示屏设计 专 业：应用电子技术二班 姓 名：李志辉

学 号：093001484

摘 要

LED 显示屏是一种新型信息显示媒体，集微电子技术、光电子技术、计算机技术、信息处理技术于一体的大型显示系统。以其色彩鲜艳，动态范围广，亮度高，寿命长，工作性能稳定特点，广泛应用于广告、证券、信息传播、新闻发布等方面。

本文设计了基于单片机的LED汉字显示屏。给出了系统框图，硬件模块设计图、软件流程图和程序。硬件模块设计方面，主控制系统采用单片机控制方式，实现点阵 LED显示屏的驱动及信息的保存与显示。LED显示点阵主要由LED、字模及其电路构成。通过单片机的控制驱动电路，采用扫描方式进行显示。用C语言进行软件设计，增加了程序的可读性和可移植性。为了便于扩展和更改，软件的设计采用模块化结构，使程序设计的逻辑关系更加简洁明了。通过试验实现了汉字的滚动显示功能，达到了预期效果。 关键词：LED, 点阵, 字模

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ABSTRACT

LED display is new information shows that the media set microelectronic technology, photonics technology, computer technology, information processing technology in the large-scale integrated display system. With its colorful, wide dynamic range, high-brightness, long life and performance characteristics of stability, widely used in advertising, securities, information dissemination, press releases, and so on.

This paper was designed based on SCM LED display Chinese characters. By Given system diagram, hardware module design, software, flow charts and procedures, hardware module design, the main control system using SCM control, and dot-matrix LED display driver and the preservation and display of information. LED display lattice mainly by the LED, word-model and its circuit. SCM control through the drive circuit, a scan showed that way. C language software designed to increase the readability of the procedure and portability. In order to facilitate the expansion and changes, the software design is modular structure, so that the logic of relations much concisely. Through the pilot realized the rolling display Chinese characters, achieved the expected results.

KEY WORDS: Led，field-array, word-mode

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1 绪 论

LED 显示屏是八十年代后期在全球迅速发展起来的新型信息显示媒体，是集微电子技术、光电子技术、计算机技术、信息处理技术于一体的大型显示系统。它以其色彩鲜艳，动态范围广，亮度高，寿命长，工作性能稳定而日渐成为显示媒体中的佼佼者，广泛应用于广告、证券、信息传播、新闻发布等方面，是目前国际上极为先进的显示媒体。

1.1 LED 显示屏的研究背景及意义

在现代信息化社会的高速发展过程中，最具意义的莫过于大屏幕显示已经从公共信息展示等商业应用开始向消费类多媒体应用渗透。随着宽带网络的发展，数字化的多媒体内容将在信息世界中占据主流，新型的大屏幕显示设备将代替传统电视机成为人们享受信息和多媒体内容的中心。与传统的显示设备相比，正是这种未来的巨大需求让大屏幕显示技术成为众人目光的焦点：

(1) LED 显示屏色彩丰富，显示方式变化多样（图形、文字、三维、二维动画、电视画面等）、亮度高、寿命长，是信息传播设施划时代的产品。

(2) LED 显示屏是集光电子技术、微电子技术、计算机技术、信息处理技术于一体的高技术产品，可用来显示文字、计算机屏幕同步的图形。它以其超大画面、超强视觉、灵活多变的显示方式等独居一格的优势，是目前国际上使用广泛的显示系统。

(3) LED 显示屏应用广泛，金融证券、银行利率、商业广告、文化娱乐等方面，有巨大的社会效益和丰厚的经济效益。在其历史的演变过程中，出现了多种信息传播媒体：但就其性能看：如阴级管(crt)或石英管(dv)大型电视，成本非常昂贵，在不需要超大画面且在室内使用时效果尚可；彩色液晶显示同样成本昂贵、电路复杂，面积有限，受视频角的影响非常大，可视角度很小；影象投影设备亮度小、清晰度差（画面受光不均匀）；电视墙表面有分割线，视觉上有异物感，室外应用时亮度效果差。而 LED 显示屏以其受空间限制较小，并可以根据用户要求设计屏的大小，具有全彩色效果，视角大，可以用于显示文字、图案、图象、动画、视频、录象信号等各种信息的特点得到了突飞猛进的发展。

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