How Jumbo TV Screens Work
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An outdoor jumbo TV screen in Shibuya, Japan
There are two big differences between a jumbo TV screen that you see at a stadium and the TV in your home:
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Obviously, it is gigantic compared to your TV. It might be 60 feet (20 meters) high instead of 18 inches (0.5 meters) high.
It is incredibly bright so that people can see it in sunlight.
To accomplish these feats, almost all large-screen outdoor displays use light emitting diodes (LEDs) to create the image.
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LEDs are, essentially, little colored light bulbs. Modern LEDs are small, extremely bright and use relatively little power for the light that they produce. Other places you now see LEDs used outdoors are on traffic lights and automobile brake lights.
On a color CRT television set, all of the colors are produced using red, green and blue phosphor dots for each pixel on the screen:
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In a jumbo TV, red, green and blue LEDs are used instead of phosphor. A "pixel" on a jumbo TV is a small module that can have as few as three or four LEDs in it (one red, one green and one blue). In the biggest jumbo TVs, each pixel module could have dozens of LEDs. Pixel modules typically range from 4 mm to 4 cm (about 0.2 to 1.5 inches) in size.
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To build a jumbo TV, you take thousands of these LED modules and arrange them in a rectangular grid. For example, the grid might contain 640 by 480 LED modules, or 307,200 modules. The size of the ultimate screen depends on the size of the LED modules:
LED Module Size 4 mm
LED Module Size 25 mm
16 x 12 meters screen size
52.5 x 39.4 feet screen size
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LED Module Size 40 mm
To control a huge LED screen like this, you use a computer system, a power control system and a lot of wiring.
- computer system looks at the incoming TV signal and decides which LEDs it will turn on and how brightly. The computer
Thelooks at the incoming TV signal and decides which LEDs it will turn on and how brightly. The computer samples the intensity and color signals and translates them into intensity information for the three different LED colors at each pixel module.
The power system provides power to all of the LED modules, and modulates the power so that every LED has the right brightness. Turning on all of those LEDs can use a lot of power. A typical 20-meter jumbo TV can consume up to 1.2 watts per pixel, or approximately 300,000 watts for the full display.
Several wires run to each LED module, so there are a lot of wires running behind the screen.
As LED prices have dropped, jumbo TV screens have started to pop up in all sorts of places, and in all sorts of sizes. You now find LED TVs indoors (in places like shopping malls and office buildings) and in all sorts of outdoor environments -- especially areas that attract lots of tourists.
For more information on LED screens and related topics, check out the links on the next page.
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LED giant screens, perimeter LED screens, scoreboards
Multi-sport scoreboards for amateur and departmental matches
The is a basic scoreboard especially designed to be installed in omnisport stadiums and large outdoor sports fields where football and rugby are practised. It is also perfect for beach sports such as beach soccer or beach volleyball. With its LED digits of 25 cm height, it offers optimal reading up to 120 m and displays the timer and the score per team. Its alphanumeric version ( ALPHA) allows customising team names.
The display of this scoreboard can be remotely controlled by the POCKET keyboard. This light and easy-to-use control keyboard allows management of scores display, starting or stopping the timer, activating the horn for rugby, managing the score by adding or removing 1 point per team. Since this scoreboard has been designed for outdoor use, it is possible to adjust its brightness in order to match the intensity of the sun's rays or at dusk.
Very easy to use, all club members will be able to control the CLASSIC and CLASSIC scoreboards. Budget-friendly solutions for smaller clubs.
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