摘要：隨著科技的日益進步，基于LED現(xiàn)實屏的研究也越來越深，同時，人們的生活水平也越來越高，這樣，也對LED方面就提出了更高的要求。用LED器件組成電子顯示屏，不但色彩絢麗而且其制作尺寸幾乎不受限制，可以達到幾十甚至幾百平方米以上，可應(yīng)用于室內(nèi)外各種公共場合顯示文字、圖形、圖像、動畫、視頻圖像等信息，具有較強的廣告渲染力和震撼力，美化和豐富了人們的生活環(huán)境。
傳統(tǒng)LED顯示系統(tǒng)的控制以單片機為核心，功能較為簡單，當(dāng)需要進行數(shù)據(jù)處理時，單片機的處理能力就更顯不足，不能滿足LED顯示屏發(fā)展的需要。本文將介紹一種基于ARM和CPLD控制平臺的LED全彩色顯示屏控制系統(tǒng)。論文首先介紹了LED顯示技術(shù)和系現(xiàn)實原理，然后從硬件和軟件兩個方面，分別詳細介紹了系統(tǒng)硬件的設(shè)計和軟件的設(shè)計，最終實現(xiàn)預(yù)期功能。

關(guān)鍵詞: 單片機 ARM CPLD LED 灰度















Abstract: With the increasing progress of science and technology, based on the LED screen reality more and more deep study, at the same time, people's living standards have become more sophisticated, so that LED is also on a higher demand. Composed of electronic devices with LED displays, not only colorful and attractive but also produced virtually unlimited size, can reach tens or even hundreds of square meters, can be applied to a variety of indoor and outdoor public display text, graphics, images, animation, video images and other information, the ad has a strong and powerful rendering, landscaping and rich people's living environment.
Traditional LED display system to control the single-chip microcomputer as the core function of relatively simple, when the need for data processing, the single-chip processing power is even more inadequate, can not meet the needs of the development of LED display. This article will introduce an ARM and CPLD-based control platform, full-color LED display control system. Paper introduces the LED display technology and the Department of the reality principle, and then from the two aspects of hardware and software, respectively, described in detail the design of system hardware and software design, and ultimately to achieve the desired function.

Key words: Single-chip Microcomputer, ARM, CPLD, LED, Gray
目 錄

1 緒論 1
1.1 LED大屏幕的研究現(xiàn)狀 1
1.2 LED大屏幕的發(fā)展趨勢 1
1.3 論文研究的內(nèi)容 2
2 LED顯示屏的工作原理 3
2.1 LED工作原理 3
2.1.1 簡述 3
2.1.2 LED發(fā)光的基本原理 4
2.2 LED器件的驅(qū)動原理 5
2.2.1直流驅(qū)動 5
2.2.2恒流驅(qū)動 5
2.2.3脈沖驅(qū)動 5
2.2.4 掃描驅(qū)動 6
3 LED顯示技術(shù)的發(fā)展和基本原理 7
3.1 LED顯示技術(shù)的發(fā)展歷史 7
3.2 LED顯示技術(shù)的基本原理 8
3.2.1灰度掃描的實現(xiàn) 8
3.2.2 信息刷新原理 9
3.2.3掃描控制電路總體說明 9
3.2.4 彩色顯示屏的γ校正 10
3.2.5顯示屏均勻性的改造 12
3.2.6 亮度控制器模塊 13
4 LED彩屏顯示系統(tǒng)的硬件設(shè)計 13
4.1 ARM芯片簡介及硬件電路設(shè)計 13
4.1.1 ARM芯片簡介 13
4.1.2 ARM的硬件電路設(shè)計 15
4.2 CPLD技術(shù)簡介及硬件電路設(shè)計 20
4.2.1 CPLD技術(shù)簡介 20
4.2.2 CPLD的硬件電路設(shè)計 21
5 LED彩屏顯示系統(tǒng)的軟件設(shè)計 21
5.1 ARM的軟件設(shè)計 21
5.1.1 ARM匯編語言的程序結(jié)構(gòu) 21
5.1.2基于ARM的系統(tǒng)初始化過程 22
5.2掃描驅(qū)動電路的CPLD軟件設(shè)計 23
5.2.1 Altera可編程程邏輯器件開發(fā)軟件介紹 23
5.2.2 利用VHDL語言實現(xiàn)顯示控制 24
6 仿真效果及結(jié)論 25
6.1 仿真效果 25
6.2 結(jié)論 26
參考文獻 27
致 謝 28