How Jumbo TV Screens Work
The video screens at sporting events and concerts are almost like your home TV -- except they're HUGE! They canââ,¬â,,¢t use CRTs -- you wouldnââ,¬â,,¢t be able to see the picture in sunlight. So what's going on behind the scenes? Learn about the technology that makes these 30-foot screens possible.
http://electronics.howstuffworks.com/jumbo-tv.htm