later models had lower resolutions. The JumboTron at the now-demolished Tampa Stadium in Tampa, Florida, measured 30 ft (9 m) diagonally, with a resolution of only 240x192 pixels, below VHS resolution. Screen size since then varies depending on the venue. The display introduced in 1985 was 40 meters wide by 25 meters tall. Newer, LED-based large screens have resolutions that are an order of magnitude greater than the early JumboTron resolution at a fraction of the cost. For example, the much publicized center-hung video board in the Dallas Cowboys' AT&T Stadium is 72 feet tall and 160 feet wide (22 m x 49 m), displaying HDTV at 1920 x 1080 resolution, 45 times more pixels. The largest JumboTron in use was located at SkyDome (now Rogers Centre) in Toronto, Ontario, and measured 10 m tall by 33.5 m wide (33 ft × 110 ft) at a cost of US$17 million. By comparison, a similar-sized LED system sold today would cost around $3 million. The Rogers Centre JumboTron was replaced in 2005 by a Daktronics ProStar as part of a stadium revitalization project. Sony JumboTron was the first video board ever in Times Square. It remained that way for almost ten years. Purpose Originally, JumboTrons solely displayed the scores of the games via numerical displays. This then evolved into instant replays being showcased for the benefit of fans within the stadiums or arena, and in modern day, social media is heavily integrated, with fans being urged to post on various social media platforms to then have their content appear on the JumboTron screen. Sony JumboTron's were the world's first mobile screens and concert screens. Big Mo was the first portable video screen and Genesis used the first portable video screens for concert tours in the mid-90's. Specifications of production and design Originally, the JumboTron was not an LED display (light-emitting diode display), since blue LEDs were unavailable at the time, and the only green LEDs available were of the traditional yellow-green variety, which were unsuitable for an RGB display. Each display consisted of multiple modules composed of 16 or more small flood-beam CRTs (cathode ray tubes), each of which included from 2 to 16 pixels composed of red, green, and blue phosphors. Sony displayed one of the earliest versions at the Expo '85 World's Fair in Tsukuba. Eventually, JumboTron systems adopted LED technology as blue and pure green LEDs were developed.