4K resolution
4K resolution, also called 4K, refers to a horizontal display resolution of approximately 4,000 pixels. Digital television and digital cinematography commonly use several different 4K resolutions. In television and consumer media, 38402160 (4K UHD) is the dominant 4K standard, whereas the movie projection industry uses 40962160 (DCI 4K).
DirecTV
In November 2014, DirecTV became the first television provider to begin offering 4K ultra-high definition content. On launch, 4K content was limited to renting a small library of on-demand films, downloaded to the subscriber's Genie DVR (some 4K content can also be pre-loaded automatically to the set-top box via the Genie Recommends feature). The 4K service could also only be used on "DirecTV 4K Ready" televisions, which support RVU protocol; this was limited to selected Samsung 4K televisions released in 2014.