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NotTaR of Television Sets : How can I couple 4 TV screens to make th..
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"I've being thinking about how people do these kind of things?
Is this analog stuff or do they use some kind of digitized
signal which is then divided to each TV?"
It is mostly digital. The original master signal is digitized and
stored in memory. Control codes specify the readout of a (probably double
buffered) frame store. 9 and 16 screen versions are common. If you
look closely, you will note that the resolution of pictures that differ
is always lower indicating that the whole affair is driven from a single
tape source with appropriate decoding. Where the pictures are the same,
they may be at full resolution. Sub blocks of identical pictures may be
at some intermediate resolution.