UHD
UHD (Ultra HD) is a display resolution of 3840x2160 pixels (four times as many pixels as FHD) in the same 16:9 aspect ratio. This resolution is part of the UHDTV standard.
UHD 4K (3840x2160)
4K UHD(2160p) is 3840 pixels wide by 2160 pixels tall (8.29 megapixels), which is four times as many pixels as 1920x1080 (2.07 megapixels).
Digital Cinema Initiatives 4K (4096x2160)
Standard established by the Digital Cinema Initiatives consortium consisting of 4096 pixels × 2160 lines (8.8 megapixels, aspect ratio ≈17:9) for 4K film projection. This is the native resolution for DCI-compliant 4K digital projectors and monitors.
UHD+ 5K (5120x2880)
UHD+ is a display resolution of 5120x2880 with a 16:9 aspect ratio. The line count of 2880 is also the least common multiple of 480 and 576, the scanline count of NTSC and PAL, respectively. Such a resolution can scale SD content to fit by natural numbers, 6 for NTSC and 5 for PAL. The first display with this resolution is the Dell UltraSharp 27, announced on September 5, 2014. On October 16, 2014, Apple announced the iMac with 5k display. Thunderbolt 3 & DisplayPort 1.3 came with support for this resolution.
FUHD 8K (7680x4320)
FUHD (Full Ultra HD) is a display resolution of 7680x4320 pixels (four times as many pixels as Ultra HD, or sixteen times as many pixels as Full HD) in the same 16:9 aspect ratio.
QUHD 16K (15360x8640)
QUHD (Quad Ultra HD) is a display resolution of 15360x8640 pixels (four times as many pixels as FUHD (8K, see above), or sixteen times as many as UHD) in the same 16:9 aspect ratio.
12M (4000x3000)
Color space dynamic range and frame rate
The human visual system has a limited ability to discern improvements in resolution below a certain size and beyond a certain distance. At current consumer home viewing distances and TV sizes, increasing resolution to 4K may have little perceptual impact, as consumers would not be close enough (the Lechner distance) to appreciate the differences in pixel count between 4K and HD. UHDTV also allows other image enhancements in dynamic range and color, which can improve the perceived difference between 4KTV and HDTV. UHDTV allows the future use of the new Rec. 2020 (UHDTV) color space which can reproduce colors that cannot be shown with the current Rec. 709 (HDTV and most current 4KTV) color space. When dealing with CIE 1931 color space coverage, the Rec. 2020 color space covers 75.8%, whereas the digital cinema reference projector color space covers 53.6%, the Adobe RGB color space covers 52.1%, and the Rec. 709 color space covers 35.9%. UHDTV also allows for an increase in dynamic range, meaning brighter highlights but also increased detail in the greyscale. UHDTV also allows for frame rates up to 120 frames per second (fps). Note that UHDTV potentially allows Rec.2020, higher dynamic range and higher frame rates to be applied to HD services, without necessarily increasing resolution to 4K.
Application Products
