This video gives you a nice overview of checkerboard rendering, which is used almost universally in PS4 and Xbox One games. It's essentially this generation's interlacing. A ton of data is being lost every frame because games are just rendering half the data and filling in the gaps with information from the previous frame.
Here's a quotation from one of the developers in the video:
I would also like to add that while the difference in quality is pretty obvious in the slides when they get pointed out, Digital Foundry's in depth tech review didn't notice the checkerboard rendering and went on to say that the game ran in native 1800p on the pro consoles. Something I am quite proud of.