What is Ultra High-Definition TV (UHDTV)? - Definition from WhatIs.com


Ultra High-Definition TV (UHDTV)

Part of the Multimedia and graphics glossary:

Ultra-high-definition (UHD) television, also abbreviated UHDTV, is a digital television display format in which the horizontal screen resolution is on the order of 4000 pixels (4K UHD) or 8000 pixels (8K UHD).

Technically, a 4K UHD display has 3840 pixels horizontally and 2160 pixels vertically for a total of 8,294,400 pixels or 8.3 megapixels. An 8K UHD display has 7680 pixels horizontally and 4320 pixels vertically for a total of 33,177,600 pixels or 33.2 megapixels. Therefore, 4K UHDTV has roughly four times as many pixels as conventional HDTV (high-definition television), and 8K UHDTV has roughly 16 times as many pixels as conventional HDTV.

According to the Consumer Electronics Association, a display must have at least one digital input with a native (design) resolution of 3840 by 2160 pixels, along with an aspect ratio of at least 16:9, in order to qualify as UHD. Both the 4K and 8K UHD specifications described above scale precisely from the most common HDTV formats, avoiding image blurring and consequent loss of detail that can occur when differing screen resolutions fail to evenly divide horizontally or vertically.

This was last updated in January 2013
Contributor(s): Stan Gibilisco
Posted by: Margaret Rouse

Related Terms


  • Dyslexie

    - Dyslexie is a font designed for greater readability to help people who have difficulty reading. The Dyslexie font features characters that are more distinct from each other, so that letters with si... (WhatIs.com)

  • holographic display

    - A holographic display is a display that uses coherent light, such as that created by laser, to create a three-dimensional (3D) image in space. (WhatIs.com)

  • projector phone

    - A projector phone is a smartphone with an embedded pico projector. Pico projectors are standalone, peripheral or embedded devices that make it possible to project presentations and other media cont... (WhatIs.com)


  • Multimedia and graphics

    - Terms related to multimedia, including graphics, animation and video definitions and words and phrases about images and sound.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Ask a Question About Ultra High-Definition TV (UHDTV)Powered by ITKnowledgeExchange.com

Get answers from your peers on your most technical challenges

Tech TalkComment



    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.