A controller card (or receiving card) is a circuit board that sits inside each LED cabinet and drives the LEDs within it. It receives the signal distributed from the main video wall controller and translates it into the precise drive signals needed to illuminate each individual LED at the right brightness and colour.
The controller card is an important specification decision, as it determines capabilities such as maximum refresh rate, greyscale depth, HDR support, and compatibility with different controller brands. Choosing the wrong card can limit what your screen is able to display, so this is something we specify carefully based on your intended use.