Do you just bought a Full HD LED TV? You can throw it away because YouTube just announced support for videos shot at 4K resolution (4096 x 3072 pixel definition). The ideal screen size for a 4K video is 25 feet.
That’s four times bigger than the current maximum resolution of consumer television and Blu-Ray movies, something really huge!
However, to play a YouTube video at 4K resolution, we require a very fast computer with ultra-fast high-speed broadband connections. Just try this 4k videos [Via]