playing with video signal- split screen and delay

hello,
i bought a nice sony tv from this guy and got to talking about this
idea i have for a tv sculpture.
he told me about signal amplifiers which i have since bought.

he also spoke of other hardware you could use to play with you video
signal - such as a box that would divide the signal into quadrants
that you could then display on multiple monitors (so you would have 4
tv's, each with a quarter of the whole image). he also mentioned a
delay box that would delay the signal a bit so every tv isn't playing
exactly the same image.

i've been searching around on the web for stuff like this but can't
find it.

how do i do these things? what do i need?

thanks,
max