NotTaR of Television Sets : How can I couple 4 TV screens to make th..  
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How can I couple 4 TV screens to make them act like only one?

"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.