I now searched the web for about an hour and just can't figure out how these displays are called or where to buy them.
A lot of airports use them for the departure table.
They seem to be just LED-Displays with a really strange dot layout.
Does anybody have an idea how these displays or these dot alignments are called?
(source: thehindu.com)
Best Answer
This is a really interesting Google challenge.
I think it may be LCD - see this patent (EP 0146285 A2):
http://www.google.co.uk/patents/EP0146285A2?cl=en
This one has what looks like a very similar pixel arrangement:
http://www.google.co.uk/patents/US5497171
And here is a brochure where they're described as 'mosaic modules':
http://www.drpmgmt.com/files/LCD.pdf
Somewhat ironically, given the earlier answer which has now been deleted, these appear to be made by Solari, though they're absolutely NOT what people generically refer to as a 'Solari Display'.