It doesn't mean anything, in the sense of it is not a 'message', like a flashing oil can means, low on oil.
What it does mean is that the juice is not getting to it, or the signal is duff, or maybe that part of the screen is on the way out....
A diagnostic check may reveal all (see your dealer) or simply try undoing the connections, blowing in them or a bit of gentle cleaning with contact cleaner (from Maplins) may fix it.