I believe IBM produced a high resolution monitor which was a single panel, but acted as if it were 4 smaller displays, complete with 4 separate display input cables. Something similar could technically be done to re-use lower-res, but higher-speed existing display controller parts on 4K panels.
Two special display input cables (DMS-59). IBM T221. I have one. It's... hard. The max I could drive it was on 25Hz -- two 1920x2400@25Hz panes besides each other. Watching a movie on it was a weird experience so I set it aside. If someone has 4 DVI outputs, you could drive it surely at 41Hz which would make a huge difference ( the monitor is up for sale :) ).
Some of the 4k displays out there are literally two panels glued together. Fortunately, DisplayPort supports multiple displays per connection, but DP hubs are expensive, presumably even if they're internal to the monitor. I'm not sure that using this feature would work for having two chips drive a single monolithic panel.
I believe the 4K displays are merely presenting themselves as if they were two displays glued together -- do you have a source that says it is actually two glasses??
