單色顯示屏的設計

電子機電論文編號:JD851 附開題報告,任務書,外文翻譯,原理圖及PCB, 論文字數(shù):18364,頁數(shù):38

單色顯示屏的設計
摘要
目次
1 緒 論 1
1.1 單色顯示屏簡介 1
1.2 LED顯示屏的發(fā)展趨勢及特點 2
2 系統(tǒng)整體設計方案論證 3
2.1 基本功能要求 3
2.2 顯示模塊方案認證 3
2.3 顯示數(shù)據傳輸方案論證 3
3 系統(tǒng)硬件電路設計 4
3.1 穩(wěn)壓電源的設計 4
3.1.1 穩(wěn)壓電源原理 4
3.1.2穩(wěn)壓電源技術標 5
3.1.3 5V穩(wěn)壓電源的設計 6
3.2 單片機系統(tǒng)及外圍電路 7
3.2.1 單片機的選擇 7
3.2.2 AT89S51芯片簡介 8
3.2.3 單片機系統(tǒng)及其外圍電路 11
3.3 驅動電路的設計 11
3.3.1 74LS154芯片簡介 11
3.3.2 列驅動電路 13
3.3.3 行驅動電路 14
3.4 點陣LED顯示屏電路 15
3.5 單片機與上位機通信模塊 17
3.5.1 MAX232芯片簡介 17
3.5.2 單片機和上位機的通信電路 18
4系統(tǒng)程序設計及仿真調試 18
4.1 系統(tǒng)程序設計 18
4.2 系統(tǒng)軟件程序調試 22
4.2.1 程序調試平臺簡介 22
4.2.2 程序調試過程及結果 22
4.3 系統(tǒng)整體Proteus仿真 23
4.3.1  Protues仿真平臺簡介 23
4.3.2 系統(tǒng)仿真 23
5 性能測試與分析 25
5.1 硬件調試 25
5.2 軟件調試 25
5.3 性能分析 27
6 結束語 28
參 考 文 獻 29
致 謝 30
附錄一：硬件電路原理圖 31
附錄二：實物演示圖 32
附錄三：軟件程序 33

摘  要
所設計的單色顯示屏是以美國ATMEL公司生產的40腳單片機AT89S51為核心，介紹了以它為控制系統(tǒng)的LED點陣電子顯示屏的動態(tài)設計和開發(fā)過程。通過該芯片控制一個74LS154和三個列驅動器ULN2003來驅動顯示屏顯示。該電子顯示屏可以顯示各種文字或單色圖像，全屏能顯示1個漢字，采用4塊8 ×8點陣LED顯示模塊來組成16×16點陣顯示模式。顯示采用動態(tài)顯示，使得圖形或文字能夠實現(xiàn)靜止、移入移出等多種顯示方式。文中詳細介紹了LED點陣顯示的硬件設計思路、硬件電路各個部分的功能及原理、相應軟件的程序設計，以及使用說明等。
系統(tǒng)程序采用匯編語言進行編輯，通過編程控制各顯示點對應LED陽極和陰極端的電平，就可以有效的控制各顯示點的亮滅。所顯示字符的點陣數(shù)據可以自行編寫，也可從標準字庫中提取。
LED顯示以其組構方式靈活、顯示穩(wěn)定、功耗低、壽命長、技術成熟、成本低廉等特點在車站、證券所、運動場館、交通干道及各種室內/外顯示場合的信息發(fā)布，公益宣傳，環(huán)境參數(shù)實時，重大活動倒計時等等得到廣泛的應用。
測試結果表明，該系統(tǒng)顯示誤差小，性能穩(wěn)定，結構合理，擴展能力強。
關鍵詞： LED；點陣顯示；單色；動態(tài)顯示；匯編語言。

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.