【正文】 板，霓虹燈信息發(fā)布媒體效果的缺陷，以其變化豐富的色彩、圖案和實時動態(tài)的顯示模式，完美的多媒體效果，成為信息傳播的劃時代產(chǎn)品。 通過對 LED 塊控制 系統(tǒng)的軟硬件的優(yōu)化，降低成本，實現(xiàn)較高的性價比 。 （ 3） 應(yīng)完成不少于一萬英文字符的翻譯及將畢業(yè)設(shè)計 (論文 )的中文摘要翻譯成英文。 指導(dǎo)教師： 年 月 日 審 批 人： 年 月 日 第 Ⅳ 頁 摘 要 本設(shè)計利用 硬件和軟件的結(jié)合 ，采用 51 系列單片機 開發(fā)出高性價比的LED 顯示屏 。 本文在研究 LED 顯示屏電路的基礎(chǔ)上，通過特殊的數(shù)據(jù)組織方法、以及控制卡硬件電路的優(yōu)化，和市場上同樣使用 51 系列單片機的控制卡比較，本 控制卡可使數(shù)據(jù)輸出速度增快 4 倍，可以達(dá)到彩屏顯示的要求。 在 LED 卡硬件電路設(shè)計時，參閱大量書籍，分析市場上各類 LED 控制卡，系統(tǒng)性提出了加快 LED 顯示速度的解決方案。在 LED 控制卡的設(shè)計上，利用單片機讀信號，將存儲器的數(shù)據(jù)直接旁路輸出到 LED 屏中，減少 CPU 的處理時間。 本文結(jié)合 單片機的擴(kuò)展技術(shù) ， 在中 LED 控制顯示方面引入 采用 了74HC245,74HC138,74HC595,STC89C58RD,39SF040,MAX232 芯片， 并 介紹程序的流程 。把光電技術(shù)，微電子技術(shù)，計算機技術(shù)和 通信技術(shù)充分應(yīng)用到高性價比 LED 顯示屏的設(shè)計中。第 Ⅴ 頁 Abstract This design, in which the hardware and software integration is used, develops high performancetoprice ratio LED display based on series of 51 single chips. The key technology in this design is the optimization of hardware and software in driving circuit design to speed up the LED screen refresh rate, achieving nonvibration demonstration, finally to reduce costs of LED screen. Based on studies the presentday LED display circuit, the control circuit is optimized, the data structure has a special method of arrangement. The control board achieved the request of color display as its speed for transmitting is 4 times fast than the one used same 51 MCU on the market. My article proposes a holistic method to quicken the display speed of LED， and designs the circuit of LED hardware based on reading large numbers of books and analyzing many kinds of LED controlboard on the market. According to the data characteristic of LED display， let the host puter arranges the display data effectively. As the result the time transacted by the controlboard is decreased. Through utilize MCU to read the signal and the data of memorizer to LED display output by pass, the time of managed by MCU is reduced also. To avoid circle sentence maximum when using C language writes the display program, the output data speed of LED controlboard is able to quicken Based on the expansion of MCU technology in the design of control LED shows used to introduce 74 HC245, 74HC138, STC89C58RD, 39SF040， MAX232 chips, and introduced the procedural process. This article has highlighted its software and hardware high performancetoprice ratio. Photoelectron technical, microelectronics technical, puter technical and munication technology are fully applied for the screen of the high performance to price ratio LED display Key Words： LED 。 Sftware； Optimized； high performance to price ratio. .第 VI 頁 目 錄 第 1 章 緒論 .......................................................................................................................... 1 LED 顯示屏問世 ......................................................................................................... 1 LED 的發(fā)展及應(yīng)用領(lǐng)域 ............................................................................................. 1 LED 國外發(fā)展 ....................................................................................................... 1 LED 在我國的發(fā)展 ............................................................................................... 4 LED 應(yīng)用領(lǐng)域 ....................................................................................................... 4 LED 特點 ..................................................................................................................... 5 LED 顯示屏分類 ......................................................................................................... 6 第 2 章 LED 基本設(shè)計原理 ............................................................................................... 9 LED 基本原理和特性參數(shù) ....................................................................................... 10 LED 的基本原 理 ................................................................................................. 10 LED 特性參數(shù) ..................................................................................................... 11 LED 的應(yīng)用原理 ....................................................................................................... 12 LED 的驅(qū)動方式 ................................................................................................. 12 七段 LED 顯示器 ............................................................................................... 13 8*8 點陣式 LED 原理 ......................................................................................... 14 標(biāo)準(zhǔn)雙基色 LED 顯示屏幕單元板工作原理 ................................................... 15 第 3 章 系統(tǒng)總體設(shè)計 ........................................................................................................ 18 系統(tǒng)設(shè)計思想 ........................................................................................................... 18 系統(tǒng)設(shè)計目標(biāo) ........................................................................................................... 19 整體性能指標(biāo)分析及芯片選擇 ............................................................................... 19 第 4 章 高性價比 LED 顯示屏硬件開發(fā)部分 ................................................................ 21 通信接口電路設(shè)計 ................................................................................................... 22 串行口連接線 ..................................................................................................... 22 儲存器電路設(shè)計 ....................................................................................................... 26 顯示模塊芯片組成 ................................................................................................... 29 74HC245 芯片介紹 ............................................................................................. 29 74HC138 芯片介紹 ...............................................................................