I have definitely seen TVs where there is a top transparant plastic layer that looks like protective film but is absolutely not supposed to come off. I’ve even seen two models of OLED TVs that are very similar, and have plastic on the metal backing. On one of them it says to absolutely not remove the plastic. On the other it says to make sure to remove it, otherwise the TV will overheat.

Even if you know a lot about these kinds of things, don’t be proud and just read the manual / quick start guide. It will tell you what plastic needs to be removed and what needs to stay.