At this point, the closest thing to what you're looking for is a 13.3" monitor that's had a small commercial release. There is nothing even close to 80" commercially and I don't think there has even been much talked about being in research that was much bigger than that. Your only choice would be to tile a bunch of them together, and I think that discussing the how-to on that would likely go beyond a discussion on this board. (and I have no clue how you would, so I can't help)
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