LED screens have become a staple for large screens in high light levels over the last ten years. These systems work by using vast arrays of Light Emitting Dioides (LED) to produce red, green and blue light. The balance of these three "primary" colors allows for almost any color to be produced, with an equal level of all three creating a "white" light.
It may seem strange that only three colors really exist, but this is similar to how most print media and TV screens work. LED screens are typically constructed from multiple panels bolted together. These panels are often approximately one square meter each and can be scaled from a small size right up to enormous structures for large festivals etc.
The main benefits of LED screens are:
They are the brightest of all screen systems
Many systems are suitable for outdoor (wet) use
As they do not rely on any kind of projection the panels are quite thin (around 30cm) and do not require equipment such as projectors etc anywhere else in the audience or event space
They are reasonably efficient on power
They are flexible in terms of where and how they are set up. Options vary from integrating them into an outdoor structure, to ground-stacking, to having truck-mounted screens that can be set up in minutes
Because they emit light directly (rather than rely on front-projection) performers and the public can walk in front of them without casting shadows
The main drawbacks are:
The pixel pitch (more on this below) is much larger than other screen systems. At time of print a common pixel pitch is 15 mm and the absolute best available is 6 mm (at huge expense). This means that they are inappropriate for applications where the audience will be close to the screen
They tend to be very heavy, which means large rigging systems need to be provided which can be costly in both time and money.
Generally speaking, where an event is taking place in an area of high brightness and a large screen is needed, LED is an obvious solution.
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