* The brands of controller/card depends on the customer preferences. If no special requirement, we will recommend the most cost-efficient model to our clients.

* The controlling pixel pitch qty. of those devices.

Each model of the controller/card has its max loading pixel pitch quantity (LED quantity).  We learn before that the different pixel pitch LED display modules vary a lot.

How many control card need for a LED display screen depends on the Pixel Density and the control card's spec.

The control card's Loading Capacity should bigger than the Pixel Density of your LED display screen.

Below picture show the Pixel Density for different LED Display Modules.

Below picture shows the Loading Capacity of different control card.