also seen as on screen, or onscreen
As shown on a movie, television, or computer screen, it refers to something within public view. It is most commonly seen as an adjective, for example, "check out that on-screen graphic" or "the Blackberry has a QWERTY keyboard and an on-screen keyboard whereas the iPhone only has an on-screen keyboard." Even though it is also seen as "on screen" or "onscreen" the preferred spelling is with a hyphen: on-screen.
NetLingo Classification: Online Jargon