基于CPLD的大屏幕扫描电路设计

Design of Big Screen Scan Circuit Based on CPLD

为了能显示稳定的图像,对扫描电路的速度要求很高,特别是在实现灰度控制时,要求更高。所以,精心地设计扫描电路是提高图像稳定性的关键。介绍LED大屏幕显示电路结构及扫描电路的设计方法,给出Altera公司的EPM7128在大屏幕扫描电路中的设计实例,阐述可编程逻辑器件在高速数字系统应用中的优点。通过实验,扫描图像非常稳定,充分体现了可编程逻辑器件在高速复杂数学系统中的优势。

In order to display a stable image, the speed of scan circuit is needed, especially to realize grey control. The design of scan circuit is a key to improve scability of image. The design method of LED big screen scan circuit is introduced in this paper,and the virtue of Programmable Logic Device（PLD） application on high speed digital system is presented. An application example based on EPMT128 of Altera Corp. and its programme are also provided. According to the experiment, scan image is stable,and advantages of PLD in high speed complex digital system are proved.