Orange was recently at an event showing off an unannounced Samsung tablet with a 12-inch 4096 x 2160 Ultra HD display. The carrier was using the mystery tablet to give a LTE broadcast demonstration.

That’s not quite as wide as what the pros use, so the pixel resolution we get ends up being 3840 x 2160 — double both the horizontal and vertical measurements of Full HD (1920 x 1080).

According to CES 2014, 4k displays are the way of the future. ... and runs at 4096 x 2160, whereas "ultra-HD" is the consumer term that technically refers to the aforementioned 3840 x 2160.