Static drive also known as the DC drivers. Static drive refers to each digital control of each segment is driven by a microcontroller I/O ports, or b using a BCD-decimal * * drive. Static driver has the advantage of easy programming, display high brightness, disadvantage is that uses I/O ports much, driven 5 digital tube driven static display you need 5x8=40 I/O ports, you know a 89S51 microcontroller I/O ports that are available are only 32. Practical applications must be increased * drive for drive, increase the complexity of the hardware circuit