i was experimenting in blender when i found this technique of turning any video into a pixel like screen https://www.youtube.com/watch?v=j7kyeAI6IJs
to push the idea further i decided to make a scene with this technique front and center literally.
i have recorded the timelapse of the entire process which you can watch here
in the timelase you will also notice am using some assets from mega scans to add some details into the scene, but the bulk of the scene is mostly assets i made my self.
the materials are supper basic, the LED billboard a translucent shader with afew extra nodes to have some dead pixels

Dead pixels?
most LED scenes will have some dead bulbs which wont light up, so to create the same effect i used a voronoi texture with distance metric set to chebychev, increased the contrast with a color ramp and that gave me the effect i was looking for.
then to light the billboard up, i added an area light in the back being that the billboard pixel material is translucent, i can use the area light to control the color and brightness of the pixels

each pixel is a cube with the translucent material, the billboad is a plan with a hair particle system and the cube is the hair instance