Nvidia researchers have used a fantastically straightforward approach to quadruple the effective resolution and double the refresh rate of cheap, off-the-shelf LCD panels: Stacking them on top of each other. This technique, which Nvidia calls cascaded displays, could be key to developing cheap, ultra-high-resolution screens that are needed for consumer-oriented head-mounted displays like the Oculus Rift. Nvidia has already built a prototype cascaded display device -- using a 3D printer no less -- that closely resembles the Oculus Rift, and the results are surprisingly good.