However, limitations in display technologies mean that most (if not all) of the 4K TVs available to buy at this time of writing are still using the existing HDTV colour space of Rec.709.
The standard for UHDTV has been defined by the International Telecommunications Union (ITU), the organisation responsible for setting such standards worldwide, under its Rec.2020 document to not only deliver higher resolution, but also include wider colour gamut, greater bit-depth and higher frame rates. There have been calls from certain camps, notably video guru Joe Kane, to use “2160p” which is arguably the most accurate, all-encompassing description. Technically, 4K refers to the 4096×2160 Digital Cinema resolution, whereas 3840×2160 should be classed as Ultra HD, but the term “4K” is just so much catchier – many TV makers have been using it to market their ultra high-def models even though their native screen resolution is 3840×2160. Also known as ultra high-definition (UHD) or Ultra HD, 4K is the next step-up in resolution of flat-screen displays, offering four times the pixel resolution of a “regular” 1080p HDTV. If you’ve been following the television industry, 4K TV is something that manufacturers have been pushing since late 2012.
Occasionally television manufacturers do release firmware updates at a later date to provide additional features which might not have been available when we reviewed the displays. Disclaimer: While this filter box is designed as a guide to help you find the best Ultra HD TV for your needs, the results are retrieved from our database of 4K televisions, where the available features were logged at time of testing.
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