本设计利用人眼的“视觉暂留”效应，采用循环高速扫描的方式，分时轮流选通各数码管的COM端，使数码管轮流导通显示。-This design uses the human eye' s " persistence of vision"　effect, with the way high-speed scanning cycle, time-gated turn the COM port of the digital control, digital control to turn on-display.