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).
Display aspect ratio
Since 2011, several monitors complying with the Digital Cinema Initiatives 4K standard have been produced. The standard specifies a resolution of 4096×2160 and an aspect ratio of almost 1.9:1.