【作者】 宋承杰；

【导师】 王景存；

【作者基本信息】 武汉科技大学 ， 控制理论与控制工程， 2010， 硕士

【摘要】 随着信息时代高新技术的飞速发展,人们对及时获取并显示各类信息的愿望日益强烈,由此带动了信息传媒的飞速发展,LED显示屏就是信息显示的重要传媒之一。LED显示屏由LED器件阵列组成,通过一定的控制方式来显示视频、行情、广告等许多信息。LED显示屏采用了低电压扫描驱动,具有功耗低、使用寿命长、低成本、亮度高、可视距离远、视角大和防水等优点,可以满足许多场合的需求,未来的发展前景非常广阔。LED大屏幕作为现代信息发布的重要媒体,它能胜任各种场合实时性、多样性和动态性的信息发布任务。在即将到来的上海世博会、广州亚运会等大型活动增加了LED显示屏的需求,将进一步推动LED显示屏的大规模发展。本文首先介绍了LED显示屏的工作原理和FPGA开发技术,它是本系统设计的研究基础。接着提出了一种彩色LED大屏幕显示系统的设计方案,然后具体分析这个系统的硬件设计和软件设计。系统的硬件设计中主要分析了模拟视频信号A/D转换的硬件设计、存储器的选择、电源的设计、FPGA的硬件设计、LED大屏幕的硬件设计和PCB的设计。本系统采用Altera公司的Cyclone系列FPGA芯片,软件设计在Quartus II环境下进行开发,用Modelsim进行仿真。系统的软件设计主要是FPGA的逻辑设计,主要分析了程序中实现SAA7111芯片I2C配置、视频数据的存储、SRAM的读写控制、灰度调制和LED显示屏扫描控制的原理、流程及方法,最后通过仿真调试验证了本系统的可行性和正确性。更多还原

【Abstract】 With the rapid development of high-tech in the information age, people’s wishes of getting and displaying all kinds of information timely are growing, thus driving the rapid development of information media. LED display screen is one of the important media in the information display. LED display screen is composed of the array of LED devices, and through certain control methods to display video, market, advertising and much information in other aspects. Driven by a low-voltage scanning, LED display screen has much advantage, such as low power consumption, long life, low cost, high brightness, visible from far away, big viewing angle and waterproof. It can meet the needs on many occasions. Its future prospect of development is very wide. As an important media of modern information dissemination, LED big screen can qualify all kinds of real-time, diverse and dynamic task of the information dissemination. The upcoming Shanghai Expo, Guangzhou Asian Games and other large events will increase the demand for LED displays, and it will promote the large-scale development of LED displays.This paper describes the working principle of LED display and the technology of the FPGA development first, it is the research base in this system design. Then a kind of display system design of colorful LED large screen has been put forward, with specifically studies of the hardware design and software design of the system followed. The hardware design of the system mainly studies the hardware design of the A / D conversion of analog video signal, the selection of memory, the design of power supply, the hardware design of FPGA, the hardware design of LED large screen and PCB design. FPGA chips of Altera’s Cyclone family is used in this system. And software design of the system is carried out in the development environment of Quartus II, using Modelsim to simulate. The software design is mainly FPGA logic design, it mainly analyses the principles, processes and methods of realizing I2C configuration of SAA7111 chip, the storage of video data, the control of read and write SRAM, modulation of gray-scale and the scan and control of LED display screen in the program. Finally, the feasibility and accuracy of this system is verified through simulation and debugging.更多还原