It lets you to create the individual LEDs for the screen, just by loading an image or a video.
As it uses instances you can generate millions of LEDs without using too much memory.

Don't worry about the performance too, as you can reduce the quality of the generated panel helping you to speedup the viewport.
If you think that this is overkill you can still use a 2D version of it, that is a lot easier for your PC to handle but still delivers amazing results.

HOW TO USE THAT:

To use this tool you just need to Append the "Procedural LED Panel.blend" file to your scene, sleecting the "LED PANEL" inside the "NodeTree" folder.

After that, load an image on the modifier and open the Shader Editor and load your image here too in the correct node. Play with the settings.

https://blendermarket.com/products/procedural-generator-bundle