What are these displays called?
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'.