A video wall controller (also called an LED processor or receiving card system) is the device that sits between your video source and the LED screen. It takes an incoming video signal — from a computer, media player, camera feed, or broadcast source — and processes it for the LED wall. This means splitting the signal, mapping it to the physical layout of the cabinets, managing resolution scaling, and distributing the image data over CAT5e or CAT6 cables to each section of the screen.
Inside the wall, LED cabinets daisy-chain together. Depending on the pixel count of each cabinet, typically up to 20 cabinets can be fed from a single cable run. The controller handles the synchronisation of all of this, ensuring the image arrives at every cabinet consistently and without tearing or latency.