单片机LED广告牌设计().pdf

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1、永城职业学院毕 业 论 文基于单片机地 LED广告牌设计题目：基于单片机地LED广告牌设计班级：机电一体化 089 班专业：机电一体化学生姓名：肖赛赛指导教师：黄 品日期 2011年 4 月 30 日目录（字体要一致）1 LED 概述 21.1LED电子显示屏概述21.2LED电子显示屏地分类32 显示原理及控制方式分析32.1LED点阵模块结构32.2LED 动态显示原理42.3 LED 常见地控制方式53 硬件电路设计63.1系统硬件概述63.2 16 16LED 点阵显示制作83.2.1 1616LED点阵地内部结构及工作原理83.2.2用8 8LED点阵构成16 16LED点阵93.3

2、 主控单片机地接口说明113.4 LED 显示驱动电路124 字模生成 124.1 字模简介124.1.1 LED 显示屏领域字模实现技术134.1.2软件控制系统字模提取地分析与设计134.2 字模存储技术144.3字库生成145 软件设计 165.1 程序设计总体思路和结构165.1.1程序设计总体思路165.1.2 程序流程图165.2 各模块程序设计175.2.1 系统初始化175.2.2 LED动态显示175.2.3 汉字显示地原理176 系统功能测试186.1单元模块电路测试186.2系统整体功能测试18总结 19致谢 19参考文献 20附录 20基于单片机地LED广告牌设计摘 要

3、本设计使用AT89C51 系列高速单片机作为主控制模块,利用简单地外围电路文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:

4、CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码

5、:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编

6、码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档

7、编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文

8、档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10

9、文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T1

10、0来驱动 64 16地点阵 LED 显示屏.利用 AT89C51系列高速单片机本身强大地功能,可以很方便地实现单片机与PC 机间地数据传输及存储,并能利用软件方便地进行显示内容地多样变化,另一方面点阵显示屏广泛地应用于医院.机场.银行等公共场所,所以本设计具有很强地现实应用性.（行间距）LED（Light Emitting Diode）,发光二极管,简称 LED,是一种能够将电能转化为可见光地固态地半导体器件,它可以直接把电转化为光.LED 地心脏是一个半导体地芯片,芯片地一端附在一个支架上,一端是负极,另一端连接电源地正极使整个芯片被环氧树脂封装起来.半导体芯片由两部分组成,一部分是P 型半

11、导体,在它里面空穴占主导地位,另一端是N 型半导体,在这边主要是电子.但这两种半导体连接起来地时候,它们之间就形成一个“P-N 结”.当电流通过导线作用于这个芯片地时候,电子就会被推向P 区,在 P 区里电子跟空穴复合,然后就会以光子地形式发出能量,这就是 LED发光地原理.LED点阵显示具有如下特点：（1）电压：LED使用低压电源,供电电压在 6-24V 之间,根据产品不同而异,所以它是一种比使用高压电源更安全地电源.（2）效能：消耗能量比同光效地白炽灯减少80%.（3）适用性：每个单元LED小片是 3-5mm地正方形,所以可以制备成各种形状地器件,并且适合于易变地环境.（4）稳定性：10

12、万小时,光衰为初始地 50%.（5）响应时间：其白炽灯地响应时间为毫秒级,LED 灯地响应时间为纳秒级.（6）对环境污染：无有害金属汞.（7）颜色：改变电流可以变色,发光二极管方便地通过化学修饰方法,调整材料地能带结构和带隙,实现红黄绿兰橙多色发光.【关键词】动态显示；单片机；点阵字库1 LED 概述1.1 LED 电子显示屏概述LED 电子显示屏（Light Emitting Diode Panel）是由几百-几十万个半导体发光二极管构成地像素点,按矩阵均匀排列组成.利用不同地半导体材料可以制造不同色彩地LED 像素点.目前应用最广地是红色.绿色.黄色.而蓝色和纯绿色LED 地开发已经达到了

13、实用阶段.LED 显示屏是一种通过控制半导体发光二极管地亮度地方式,来显示文字.图形.图像.动画.行情.视频.录像信号等各种信息地显示屏幕.文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7

14、H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N

15、7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5

16、N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D

17、5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10

18、D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I1

19、0D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I

20、10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10LED 显示屏分为图文显示屏和条幅显示屏,均由 LED矩阵块组成.图文显示屏可与计算机同步显示汉字.英文文本和图形；而条幅显示屏则适用于小容量地字符信息显示.LED 显示屏因为其像素单元是主动发光地,具有亮度高,视角广.工作电压低.功耗小.寿命长.耐冲击和性能稳定等优点.因而被广泛应用于车站.码头.机场.商场.医院.宾馆.银行.证券市场.建筑市场.拍卖行.工业企业管理和其它公共场所.LED 显示屏地发展前景极为广阔,目前正朝着更高亮度.更高气候耐受性.更高地发光密度.更高地发光均匀性,可靠性.全色化方向发展.1.2 LED 电

21、子显示屏地分类按颜色分类：单基色显示屏:单一颜色（红色或绿色）.双基色显示屏：红和绿双基色,256 级灰度.可以显示 65536 种颜色.全彩色显示屏：红.绿.蓝三基色,256 级灰度地全彩色显示屏可以显示一千六百多万种颜色.按显示器件分类：LED数码显示屏：显示器件为 7 段码数码管,适于制作时钟屏.利率屏等,显示数字地电子显示屏.LED 位图文显示屏：显示器件是由许多均匀排列地发光二极管组成地点阵显示模块,适于播放文字.图像信息.按使用场合分类：室内显示屏：发光点较小,一般 3mm-8mm,显示面积一般零点几至十几平方M.室外显示屏：面积一般几十平方M至几百平方M,亮度高,可在阳光下工作,

22、具有防风.防雨.防水功能.按发光点直径分类：室内屏：3mm.3.75mm.5mm.室外屏：10mm.12mm.16mm.19mm.21mm.26mm 室外屏发光地基本单元为发光筒,发光筒地原理是将一组红.绿.蓝发光二极管封在一个塑料筒内共同发光增强亮度.2 显示原理及控制方式分析2.1 LED 点阵模块结构八十年代以来出现了组合型LED点阵显示器模块,以发光二极管为像素,它用高亮度发光二极管芯数组组合后,环氧树脂和塑模封装而成.这种一体化封装地点阵 LED 模块,具有高亮度.引脚少.视角大.寿命长.耐湿.耐冷热.耐腐蚀等特点.LED 点阵规模常见地有 44.48.57.58.88.1616 等

23、等.根据像素颜色地数目可分为单色.双基色.三基色等.像素颜色不同,所显示地文字.图像等内容地颜色也不同.单色点阵只能显示固定色彩如红.绿.黄等单色,双基色和三基色点阵显示内容地颜色由像素内不同颜色发光二极管点亮组合方式决定,如红绿都亮时可显示黄色,如果按照脉冲方式控制二极管地点亮时间,则可实现 256 或更高级灰度显示,即可实现真彩色显示.图 2.1 示出最常见地 88单色 LED点阵显示器地内部电路结构和外型规格,其它型号点阵地结构与引脚可实验获得.文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R

24、2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10

25、R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I1

26、0R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I

27、10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5

28、I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A

29、5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3

30、A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10图 2.1 8 8单色 LED模块内部电路LED 点阵显示器单块使用时,既可代替数码管显示数字,也可显示各种中西文字及符号如5x7 点阵显示器用于显示西文字母58点阵显示器用于显示中西文,8x8 点阵可以用于显示简单

31、地中文文字,也可用于简单图形显示.用多块点阵显示器组合则可构成大屏幕显示器,但这类实用装置常通过PC机或单片机控制驱动.2.2 LED 动态显示原理LED 点阵显示系统中各模块地显示方式：有静态和动态显示两种.静态显示原理简单.控制方便,但硬件接线复杂,在实际应用中一般采用动态显示方式,动态显示采用扫描地方式工作,由峰值较大地窄脉冲电压驱动,从上到下逐次不断地对显示屏地各行进行选通,同时又向各列送出表示图形或文字信息地列数据信号,反复循环以上操作,就可显示各种图形或文字信息.点阵式 LED 汉字广告屏绝大部分是采用动态扫描显示方式,这种显示方式巧妙地利用了人眼地视觉暂留特性.将连续地几帧画面高

32、速地循环显示,只要帧速率高于 24 帧/秒,人眼看起来就是一个完整地,相对静止地画面.最典型地例子就是电影放映机.在电子领域中,因为这种动态扫描显示方式极大地缩减了发光单元地信号线数量,因此在 LED 显示技术中被广泛使用.以 8 8 点阵模块为例,说明一下其使用方法及控制过程.图 2.1 中,红色水平线Y0.Y1 Y7 叫做行线,接内部发光二极管地阳极,每一行 8 个 LED 地阳极都接在本行地行在线.相邻两行线间绝缘.同样,蓝色竖直线 X0.X1X7 叫做列线,接内部每列 8个 LED 地阴极,相邻两列线间绝缘.在这种形式地LED 点阵模块中,若在某行在线施加高电平（用“1”表示）,在某列

33、在线施加低电平（用“0”表示）.则行线和列线地交叉点处地LED 就会有电流流文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码

34、:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编

35、码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档

36、编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文

37、档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10

38、文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T1

39、0文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T

40、10过而发光.比如,Y7 为 1,X0 为 0,则右下角地 LED 点亮.再如 Y0 为 1,X0 到 X7 均为0,则最上面一行 8 个 LED 全点亮.现描述一下用动态扫描显示地方式,显示字符“B”地过程.其过程如图 2.2 图 2.2 用动态扫描显示字符“B”地过程2.3 LED 常见地控制方式目前常见地是并行传输方式（见附录1.1）,通过 8 位锁存器将 8 位总线上地列数据进行锁存显示,各 8 位锁存器地片选信号由译码器提供.此种方式地优点是传输速度快,对微控制器（MCU）地通信速度要求较低.但是这种方案最大地缺点是不便于随意扩展显示单元地数目.每增加一个1616 点阵地全角汉字显示

41、单元,就需要在之前地电路上多增加两根地址线,这就要求在PCB布线地时候要留有充足地地址线冗余量.再一个缺点是,每个单元地PCB随着安放位置地不同,布线结构也不相同,不利于厂家批量生产.并行传输需要地芯片较多,因此市场上已经出现用 FPGA,CPLD 等高密度可编程逻辑器件（PLD）来取代传统锁存器IC 地方案.成本有所下降,但可扩展性仍旧较差.因此,并行传输方式适用于显示单元数目确定地条屏.随着广告屏显示内容地多媒体化,对控制器传输速度,运算能力地要求越来越高.因此控制器地种类也在不断发展以适应要求,从最初地 8051 单片机,到 PIC 单片机,又到 FPGA,直到现在地ARM处理器.不同功

42、能档次地广告屏对应着不同地处理器.一以传统 8051 单片机为控制器地LED显示屏.因受到单片机运算速度及通信速率地限制,LED 动态显示地刷新率不可能做得太高.对显示效果和移动算法地处理也比较吃力,在实际显示效果上有比较明显地闪烁感.除此之外,传统 8051 单片机地内部资源贫乏,仅 128 字节地数据存储器,几 K 字节地程序内存,无E2PROM,SPI.这就需要对单片机扩展外设,无疑增加了硬件成本.因此,8051 控制地条屏只能用于显示内容及其简单,不需要经常更改显示内容地场合.二以 PIC 单片机为控制器地LED显示屏.因 PIC 单片机是 RISC架构地工业专用单片机,处理指令地速度

43、有所增加,抗干扰能力优秀,型号种类繁多.作为条屏地控制器,可以明显地改善显示效果,同时 PIC 单片机内部地资源较丰富,可节省外部电路设计难度,同时降低了硬件成本.因此,以 PIC 单片机为控制器地条屏目前仍是单色条屏市场地主流.文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5

44、N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D

45、5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10

46、D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I1

47、0D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I

48、10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8

49、I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO

50、8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10文档编码:CO8I10D5N7H8 HT3R3A5I10R2 ZO5Z4H5B6T10三以 FPGA（复杂可编程逻辑门阵列）为控制器地LED显示屏.FPGA以高速.并行著称.是近年来新兴地可编程逻辑器件.用他作为LED显示屏地控制器,能够高速地处理色阶PWM 信号.高速地完成动态扫描逻辑.高速地完成字符移动算法.因此被运用于双基色.三基色地显示系统.但是其成本较高,开发难度较大.四以 ARM（32 位 RISC 架构高性能微处理器）为控制器地LED显示屏.ARM有着极高地指令效率,极高地时钟频率.因此其运算能力非常强大,内