The technology is now being developed to allow daily interaction between the public and their screen. However the screens already host a variety of interactive events.
Interactive Games
We've been playing some ground breaking games which are based on movement recognition. A camera on top of the screen picks up and shows people moving in the square. The games have been designed by local organisations, working in partnership with many different designers.
The application then projects objects onto the screen that interact with people's movements. The result is participants rushing round the square kicking a virtual reality football or people trying to touch and destroy lots of meteorites heading for earth in the centre of the screen!
Broadcasting from Big Screen
The Big Screens operate a continuous feed of local news, weather and traffic updates from BBCi. They also show big events such as the Summer and Winter Olympics, World Cup and Euro games, The Eurovision Song Contest and Wimbledon.
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Read what others have said..
Siobhan, Leeds Our new screen here in Leeds looks so good, I can't wait for the World Cup in 2006
Michelle, Manchester Watching Live 8 on the screen was brilliant!
Simon, Liverpool I think the screen looks great. I've watched a couple of things on there - Live 8 and the football.
Mary, Birmingham I really enjoyed watching the Opera on the big screen this summer. When will there be some more?
Clive, Birmingham The Big Screen is great! It really brings the square to life.
YOUR BIG SCREEN COMMENTS
Please send us your thoughts on the big screens....
Disclaimer: The BBC will put up as many of your comments as possible but we cannot guarantee that all e-mails will be published. The BBC reserves the right to edit comments that are published.