LED digital tube needs the drive current, the monolithic integrated circuit can not satisfy. Not necessarily the triode, you can add drag resistors and so on...
Add triode can play a buffer and isolation, so that the microcontroller work more stable and reliable.
Ordinary LED digital tube public section, the normal static work current can reach 70-80mA maximum, general microcontroller IO port is not enough to provide such a large current. Adding triode can expand the driving ability of IO port.
LED digital tube needs the drive current, the monolithic integrated circuit can not satisfy. Not necessarily the triode, you can add drag resistors and so on...
