The giant Piccadilly billboard is going to track cars to target ads After nine months in darkness, the digital billboards in London’s Piccadilly Circus are about to come back bigger and brighter than ever before. Later this month, a new 790-square-metre behemoth of a screen will flash into life for the first time. The screen, which is larger than three tennis courts, packs in almost 11 million pixels at a resolution that’s greater than 4K. The display is the largest of its kind in Europe.