A fairly common request, when you need to assemble a 2x2 video wall from available or non-specialized displays, now has a simple solution. Cypress CDPS-4KQ-AD Video Wall Controller!
1080p and 4K inputs as base, but not limited to.
Resulting wall resolution = 4x1080p!
HDCP 2.2 support, transparent work with EDID and remote control of the controller via network or RS232.
This unit can take any standard 4K UHD source from HDMI and generate a high quality 2×2 video wall with bezel compensation and full audio bypass. Input supports 4K UHD HDMI video, up to and including 4K@60Hz (4:4:4, 8-bit) as well as 10/12-bit.