Design of Big Screen Scan Circuit Based on CPLD

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 EPM7128 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.