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Ultra-high-definition television

"Ultra HD" redirects here. For the video disc format, see Ultra HD Blu-ray. For the resolution commonly referred to as "Ultra HD", see 4K resolution.

Comparison of 8K UHDTV, 4K UHDTV, HDTV and SDTV resolution
Diagram of the CIE 1931 color space that shows the Rec. 2020 (UHDTV) color space in the outer triangle and Rec. 709 (HDTV) color space in the inner triangle. Both Rec. 2020 and Rec. 709 use Illuminant D65 for the white point.

Ultra-high-definition television (also known as Ultra HD television, Ultra HD, UHDTV, UHD and Super Hi-Vision) today includes 4K UHD and 8K UHD, which are two digital video formats with an aspect ratio of 16:9. These were first proposed by NHK Science & Technology Research Laboratories and later defined and approved by the International Telecommunication Union (ITU).[a]

The Consumer Electronics Association announced on October 17, 2012, that "Ultra High Definition", or "Ultra HD", would be used for displays that have an aspect ratio of 16:9 or wider and at least one digital input capable of carrying and presenting native video at a minimum resolution of 3840 × 2160.[5][6] In 2015, the Ultra HD Forum was created to bring together the end-to-end video production ecosystem to ensure interoperability and produce industry guidelines so that adoption of ultra-high-definition television could accelerate. From just 30 in Q3 2015, the forum published a list up to 55 commercial services available around the world offering 4K resolution.[7]

The "UHD Alliance", an industry consortium of content creators, distributors, and hardware manufacturers, announced during a Consumer Electronics Show (CES) 2016 press conference its "Ultra HD Premium" specification, which defines resolution, bit depth, color gamut, high dynamic range (HDR) performance required for Ultra HD (UHDTV) content and displays to carry their Ultra HD Premium logo.[b]

  1. ^ Thomas, Alexander. "Just how useful is 2160p aka 4K?".
  2. ^ "Defining the Future of Television". BBC. June 19, 2013.
  3. ^ "Leading Television Industry Players Line Up To Support '4K Ultra HD'". 2014 Press Releases. Consumer Electronics Association. November 11, 2014. Retrieved December 18, 2014.
  4. ^ Lowensohn, Josh (July 9, 2010). "YouTube now supports 4k-resolution videos". Tech Culture. CNET. Retrieved December 18, 2014.
  5. ^ "What is Ultra HDTV?", Ultra HDTV Magazine, February 5, 2008, retrieved October 27, 2013
  6. ^ "The Ultimate Guide to 4K Ultra HD", Ultra HDTV Magazine, July 28, 2013, retrieved October 27, 2013
  7. ^ "List of commercially available UHD or 4K services – October 2016 – Ultra HD Forum". May 10, 2017.
  8. ^ UHD Alliance (March 11, 2015). "Members".
  9. ^ "UHD Alliance Defines Premium Home Entertainment Experience" (Press release). Business Wire.
  10. ^ Rundle, Michael. "'UHD Alliance' finally decides what next-gen video actually is". Wired.
  11. ^ "UHD Alliance reveals its specs for 'premium' 4K TVs". July 19, 2019.
  12. ^ "What is UHD Alliance Premium Certified?".


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