A Video Monitor displays a video sent over a polyphonic cable. There would be some kind of bus standard defining the stream of pixels divided into frames. One possibility would be to have x, y, r, g b coordinates defining a stream of pixels, and a gate indicating that the frame is done.
Other modules could be plugged into the Video Monitor and send video signals to it.
At 30 frames per second, you get to have 1466 pixels per frame. Hmm… maybe the bus should send more pixels in parallel? Or perhaps it’s more like an LED grid display?