Is it having a TV show or movie on the television?
Is it having a computer monitor up and the screen on, maybe a screensaver changing every few minutes?

Is it anything other than a black screen on a monitor or TV or is it just moving pictures?

Why am I confused on this? Well, we have a computer hooked up to our TV and we have the TV on but it's tuned to Pandora. The song changes every 3 minutes or so which means the small picture where the song info is changes that often. Is that screen time? Have we ruined our daughter b/c we leave our "computer" monitor on all the time?