Wondering how plasma TVs work? Scienceblog published an article about them.
Flat panel plasma TVs on the other hand, can have large screens and only be a few inches thick. The basic idea of a plasma display is to use tiny fluorescent lights--made up of either red, blue, or green-- to form an image on the screen. Plasma refers to gas made up of free-flowing ions and electrons. When you introduce many free electrons into the gas by exerting electrical current across it, they collide with the gas' atoms knocking loose other electrons. This forms ions (an atom with a net positive charge)..