Answer:
Yes you can. There are also screen protectors that make it hard or impossible to read your screen at certain vantage points. That way, no one can walk by and try to look at what you're doing online. It can be helpful when using a laptop in a public place or at home for various reasons.
It also can protect your laptop screen from dirty, and reduce the strain caused by the screen. You can get more information about screen from Topons. Hope it can help you.