Do Not Be fooled by mobile phones QHD quad display, they are not 4K.
Quad Full HD is named because it is exactly 4 times 1080p (3840 x 2160)
When used in a home context, 4K/UHD means the TV's screen has a minimum resolution of 3,840 pixels wide and 2,160 pixels high, making it the equivalent to two 1080p screens in height and two in length. This resolution was originally known as "Quad HD," and it's used by basically every 4K TV.
Another resolution, known as 4Kx2K (4,096x2,160 pixels), is used by some projectors and many professional cameras. It also falls under the umbrella of 4K/UHD. Other shooting resolutions are also employed in the pro realm, depending on the camera.
August 2014 - Youtube website have now playback 2160p UHD 4K Video
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