Phoenix ? The Arizona Diamondbacks are planning to install a new high-definition Jumbotron that the club says will be the largest in pro sports.

The board, estimated to cost $10 million to $12 million, will be 144 feet wide and 55 feet high, and it is expected to be ready for next season’s opener. It would be 900 square feet larger than the biggest existing board, at Atlanta’s Turner Field.

“This is an important addition to an already fan-friendly ballpark,” Diamondbacks president Derrick Hall said. “Fans will have a difficult time taking their eyes off of the crystal-clear picture before them.”

Hall said the board would be paid for by Maricopa County, which owns the building.