【摘要】： 近年來(lái),LED(light emitting diode,發(fā)光二極管)電子顯示屏作為一種高科技產(chǎn)品日益引起人們的重視。它可以實(shí)時(shí)顯示或循環(huán)播放文字、圖形和圖像信息,具有顯示方式豐富、觀賞性強(qiáng)、顯示內(nèi)容修改方便、亮度高、顯示穩(wěn)定且壽命長(zhǎng)等多種優(yōu)點(diǎn),被廣泛應(yīng)用于商業(yè)廣告、體育比賽、交通信息報(bào)導(dǎo)等諸多領(lǐng)域。 LED顯示屏的核心技術(shù)主要集中在控制器中。目前,大部分異步顯示屏采用的是8位或16位的微控制器,由于受到微處理器的處理速度、體系架構(gòu)、尋址范圍、外圍接口資源等諸多限制,已難以在要求顯示較多像素、顯示內(nèi)容幀頻較高、動(dòng)態(tài)顯示效果復(fù)雜的情況下得到良好的動(dòng)態(tài)視覺(jué)效果。 針對(duì)以上情況,本文研究開(kāi)發(fā)了一種全新的,由32位高性能ARM微處理器組成的LED顯示屏控制系統(tǒng),就控制平臺(tái)、硬件結(jié)構(gòu)和軟件開(kāi)發(fā)實(shí)現(xiàn)給出了驅(qū)動(dòng)部分和控制部分的詳細(xì)分析與設(shè)計(jì)。 本文根據(jù)LED顯示屏在列車車廂和火車、汽車車站旅客導(dǎo)向系統(tǒng)中為應(yīng)用背景,結(jié)合LPC2138的功能特點(diǎn)和LED顯示屏的功能需求。詳細(xì)介紹了顯示屏控制系統(tǒng)中包括電源模塊、復(fù)位模塊、RS485通訊電路等主要模塊的設(shè)計(jì)。成功實(shí)現(xiàn)了數(shù)據(jù)掃描、數(shù)據(jù)發(fā)送、數(shù)據(jù)通訊等LED顯示屏所需的功能。 結(jié)合控制系統(tǒng)RS485通訊協(xié)議和系統(tǒng)顯示的要求,分析了LED顯示屏通訊和控制系統(tǒng)的軟件開(kāi)發(fā)流程。并詳細(xì)分析了顯示屏的靜、動(dòng)態(tài)圖文顯示軟件流程結(jié)構(gòu);系統(tǒng)從上位機(jī)接受數(shù)據(jù)到信息顯示的整個(gè)軟件處理流程。 最后本文分析了LED顯示屏控制系統(tǒng)研發(fā)中所遇到的幾個(gè)難點(diǎn)問(wèn)題,包括:提高RS485總線可靠性和抗干擾問(wèn)題、系統(tǒng)在頻繁更換內(nèi)容死機(jī)的問(wèn)題、顯示內(nèi)容較多時(shí)視覺(jué)效果的處理問(wèn)題,并給出了解決方法。 經(jīng)過(guò)實(shí)際測(cè)試,本文所述LED顯示屏控制系統(tǒng)性能良好,工作穩(wěn)定可靠,易于維護(hù)升級(jí),具有很高的性價(jià)比。
[Abstract]:In recent years, LED (light emitting diode, LED) electronic display screen as a high-tech product has attracted increasing attention. It can display or recycle text, graphics and image information in real time. It has many advantages, such as rich display mode, strong appreciation, convenient modification of display content, high brightness, stable display and long life span. It is widely used in commercial advertisements. Sports competitions, traffic information reports and many other fields. The core technology of LED display screen is mainly concentrated in the controller. At present, most asynchronous display screens use 8-bit or 16-bit microcontrollers. Due to the limitations of microprocessor processing speed, architecture, addressing range, peripheral interface resources and so on, it is difficult to display more pixels. Better dynamic visual effect can be obtained when the frame frequency of display content is high and the dynamic display effect is complex. In view of the above situation, this paper studies and develops a new LED display screen control system, which is composed of 32-bit high-performance ARM microprocessor. The hardware structure and software development are analyzed and designed in detail. According to the application background of LED display screen in passenger guidance system of train carriage, train and automobile station, this paper combines the function characteristics of LPC2138 and the functional requirement of LED display screen. The design of the display screen control system including power supply module, reset module, RS485 communication circuit and so on is introduced in detail. Data scan, data transmission, data communication and other functions of LED display screen are successfully realized. Combined with the communication protocol of RS485 control system and the requirement of system display, the software development flow of communication and control system of LED display screen is analyzed. The software flow structure of static and dynamic graphic and text display of the display screen is analyzed in detail, and the whole software processing flow from receiving data to displaying information on the upper computer is also analyzed. Finally, this paper analyzes several difficult problems encountered in the research and development of LED display screen control system, including: improving the reliability of RS485 bus and anti-interference problems, frequently changing the contents of the system to crash. The processing problem of visual effect when more content is displayed, and the solution is given. Through the actual test, the LED display control system in this paper has good performance, stable and reliable work, easy to maintain and upgrade, and has a very high performance-price ratio.
【學(xué)位授予單位】：江南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2007
【分類號(hào)】：TN873;TP273

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本文編號(hào)：2312354