LED displays are nothing more than sets of Light Emitting Diodes. The difference is that they have different shapes to display specific information. So driving LED displays is the same as regular LEDs.
This is a simple connection when there are enough microcontroller Pins. But if you want to connect more displays, you will need more microcontroller pins than it can give you. Then it would help if you made a more advanced circuit with dynamic control.
The idea of this circuit is straightforward. The human eye is inertial and can’t notice a fast flicker of images. Thus you need to light only one display at one time and then switch to another and so on. Refreshing displays like 10 – 15 times a second should be enough to see all digits’ clear image.