设计任务：

在LED显示器上，实现广告式动态显示效果，运用键盘，LED屏的配合实现数字式和图形式的特效显示。

设计要求：

（1）给出正确的原理图；

（2）给出正确的程序，并结合原理图给出相应结果。

-Design tasks: on the LED display, to achieve dynamic display ad type, using the keyboard, LED screen with the realization of digital special effects and graphical display. Design requirements: (1) give the correct diagram　(2) gives the correct procedures, combined with schematic shows the corresponding results.