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- The term "4K" is generally used by content and production companies to refer to horizontal display resolution of 3,840 pixels or greater. "Ultra HD" and "Ultra High--Resolution" are terms defined by the Consumer Electronics Association to identify displays of 3,840 x 2,160 pixels in resolution, with other requirements as discussed in the section Requirements for Using "Ultra HD". (en)
- The term "4K" is generally used by content and production companies to refer to horizontal display resolution of 3,840 pixels or greater. "Ultra HD" and "Ultra High-Definition" are terms defined by the Consumer Electronics Association to identify displays of 3,840 x 2,160 pixels in resolution, with other requirements as discussed in the section Requirements for Using "Ultra HD". (en)
- Since the CEA announcement of "Ultra HD" and "Ultra High-Definition", the terms have quickly become standard, but there are still some variations in usage. Some brands are adding "4K" to the name, as is allowed by the CEA definition. (en)
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