To put it simple, static is on the surface of screen. It's not harmful to human body. But it does exert influence on using to some extent. Radiation is emitted from interior of screen. It's harmful to human body. It can damage human skin. For example, it can accelerate aging of the outer layer of skin. It is easy to know whether the protective film is anti-static. Puting a piece of thin paper on the screen. If the paper can be sticked to the screen, then the screen is static. You cover the screen with the prtective film (or simply put it on the screen) and then put the thin paper on the screen again. If the paper can't be sticked to the screen, it indates the static is separated by the protective film, meaning the protective film is anti-static.
Radiation is a kind of wave with penetrability. Any heat source generates radiation to some extent, strong or weak. Radiation is harmful to human body. Display, keyboard and mouse generate radiation, though very little. There's no problem if you don't use them for too long. But if it's nuclear radiation, it will damage human body very badly, even cause death.
Static is a kind of phenomenon that occur because of electrostatic force generated by the interaction of point charges. Static can be generaed by friction. It may happen when screen is used for a long time. Static itselt does no harm to human body. But if your hands is static, when you touch precise instruments, the instruments may be damaged. That's because static can produce little sparks that may cause fire if there's something inflammable. The static on screen can be eliminated by wiping with damp towel.
Protecive film separates the screen and electrons. Thus it's anti-static.
