Dot Matrix screens at Wimbledon

At Wimbledon there are two dot matrix screens that are no longer in use. They are near the screens that are currently used, they are the same style as the older LUL ones (i.e. at Victoria, Embankment, Hammersmith)

Does anyone know what they used to display?

When they stopped being used?

What would they display if they were turned on now?

Where were they controlled from?

Thanks