Question: what is the difference between quad hd and 4k?
Answer: Ultra HD screens – 3840 × 2160 pixels Ultra HD, or 2160p, has four times as many pixels as the 1080p Full HD standard that we're used to. That's why its technical name is Quad Full HD (QFHD). ... But it was marketed as 4K as there's such a small difference between true 4K and Ultra HD.