I always wonder what screens are used as backgrounds during most of the stage performances? Most of them are as huge as 50ft high and around 100's of feet wide. I can assume they are LED screens but last year while I was looking for LED billboard I was told that it consumes a lot of energy and needs a dedicated transformer and are very heavy to keep transporting it from one place to another.
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Typically they're Barco video walls. These look like the ones I saw a lot. They're HD and a 9'x9' section was around $1 Million USD last I heard.