The Era of Manual Scoreboards
From the 1950s through 1970s, NPB stadium scoreboards were manually operated. Koshien Stadium's scoreboard was manual from its 1934 opening, with over 10 staff members stationed behind it to swap number plates after each score. Korakuen Stadium introduced magnetic flip scoreboards in the 1960s, achieving semi-automation through electrical signals. Manual scoreboards required staff to listen to radio broadcasts and manually update other stadiums' scores, with delays of 5 to 10 minutes. Koshien retained partial manual operation until its 2019 renovation, with the craftsmanship becoming a tourist attraction.
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Electronic Boards and Data Display Innovation
LED electronic scoreboards arrived in the 1980s. Seibu Lions Stadium installed a large electronic board in 1981, enabling real-time display of batting averages and ERAs. Tokyo Dome's 1988 opening featured one of the world's largest multi-vision screens, enabling replay broadcasts that dramatically changed the fan experience by allowing instant review of umpire calls. Color LED proliferation in the 1990s enabled player photos and video advertisements, transforming scoreboards from information displays into comprehensive entertainment systems.
Giant Screen Competition and Diverse Productions
Since the 2000s, stadiums have competed on screen size and resolution. Yokohama Stadium's 2015 installation measured 8m by 32m, setting an NPB record. ES CON Field Hokkaido in 2023 installed a 360-degree ribbon vision above the outfield fence for immersive visual productions. PayPay Dome introduced projection mapping in 2020, illuminating the entire field during player entrances. These investments range from 500 million to 2 billion yen per unit but are reportedly recoverable within 5 to 7 years through increased advertising revenue.
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The Future of Data Display and Fan Experience
Modern scoreboards display sabermetric-era data including spin rates, exit velocities, and defensive shift visualizations in real time. Since 2024, Rakuten Mobile Park Miyagi has operated a system instantly reflecting Trackman data on its vision screens, visually displaying pitch movement and launch angles. Future plans include AR glasses integration allowing spectators to overlay customized data in their field of view. However, concerns about data overload complicating the viewing experience suggest that balancing information volume will be a key challenge.