Google has rent to the word's largest and most expensive digital billboard in Times Square, New York. The screen, which is the size of a football field, is mounted on the side of the Marriot Marquis hotel. It spans an entire New York block, stands eight storeys high, and is the most expensive billboard of the world -- Google is said to have paid over $4 million for the Christmas period. The display, which is 25,000 square feet in size, features a whopping 24 million pixels.

"This innovative and thoroughly distinctive display establishes a new iconic landmark in Times Square while creating a powerful, value proposition for our advertisers. We experienced tremendous pre-sale interest, and the display is sold out to one advertiser through January 2015. We have great confidence that this spectacular billboard will be the most sought after display in the world for years to come" said Harry Coghlan, president of Clear Channel which is selling advertising space on the billboard.

Google's advertising campaign is is expected to start appearing on the screen next week.