The Giants have installed a more than $3 million, high-definition scoreboard, one of only three in a professional sports stadium in the United States. It plans to officially unveil the screen, made by Mitsubishi Electric Diamond Vision, on Tuesday. The new display, 31 1/2 feet high by 103 feet wide, is the latest addition to the high-tech ballpark. The team is also adding thirteen 17-inch LCD televisions on the stadium's Dugout Club level.