Before 4K TVs became ubiquitous, 2K TVs were the most common type of HDTV set with a screen resolution of 1,920 horizontal and 1,080 vertical pixels (1080p). Laptops and computer monitors are also widely available in 2K resolution for movie viewing. Prior to 4K TVs, there was no "2K" designation. The 2K was coined to contrast a regular 2K HDTV from 4K Ultra HD. See 1080p.

Consumer Grade2K    1920x1080 (see  DTV)

   High-Definition Resolutions4K    3840x2160 (see  4K TV).

   4.5K  4480x2520 (see  4.5K resolution).

   5K    5120x2880 (see  5K monitor)

   6K    6144x3160 (see  6K resolution)

   8K    7680x4320 (see  8K TV)

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References in periodicals archive ?
It also allows the user to freely select and cut out part of a 4K image to be "trimmed" and then enjoyed on a Full HD 2K TV.
Despite a drastic cut in the prices of large-screen TVs and in some models with discounts of around Dh4,000 from the actual price of Dh20,999, sales are not growing and Babani cited growth in smart devices (smartphones and tablets) and people not being able to differentiate the present 4K TV picture quality from the old 2K TVs as main reasons.