Sony-XBR-X900A-4K-Ultra-HD-120-Hz-3D-LED-HDTV

Ultra HD TV, also referred to as 4k, refers to television displays that provide four-times the amount of megapixels as the current 1080p format. The 3840 × 2160 lines of resolution in Ultra HD TVs are twice the amount of both vertical and horizontal lines of the 1920 x 1080p format. Therefore, Ultra HD provides 8.3 megapixels — four-times the 2.1 megapixels of 1080p. Ultra HD was defined on Oct. 17, 2012 when the CEA (Consumer Electronics Association) announced the term Ultra HD (Ultra High-Definition) would be used for displays with resolution of 3840 × 2160 (8.3 megapixels). Current HDTV standards typically fall into two lower video resolutions that include 720p and 1080i. But those formats are either less lines of resolution (720p) or interlaced rather than progressive (1080i).

The next jump in video resolution is 8k UHDTV at 7680 × 4320 (33.2 megapixels) which is 16-times the current HDTV standard.

4k Ultra HD video is enhanced with High Dynamic Range (HDR), a color specification that requires HDMI 2.0a and adds more color depth and contrast. Learn more about HDR.

View stories on HD Report tagged with 4k TV.

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