Just to note: Apple will refuse to cover any screen damage under warranty if one of these sorts of things was in use.

I would not be surprised if the same is true for some other manufacturers, too, but I can only speak definitely to Mac.

The issue is that lids close too closely + tightly now, and so anything more than a piece of tape winds up focusing all the pressure applied to the closed lid on that one spot in the glass, since the cover winds up holding the display slightly off the base of the laptop when in the closed position.