For a consumer TV, 4K Ultra HD means a picture that is 3,840 pixels wide by 2,160 pixels high, also called 2160p. It describes resolution—not a guarantee of HDR, brightness, color performance, or the quality of the content you watch.
What does 4K Ultra HD mean?
In the television context, 4K UHD is a video format with 3,840 horizontal pixels and 2,160 vertical pixels. The International Telecommunication Union (ITU) defines it as 2160p, meaning the image is displayed progressively rather than as interlaced fields. ITU-T Recommendation F.780.1 (Version 3, 2023) gives this definition; the ITU-R BT.2020 recommendation describes the broader UHDTV system context.
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Is 4K the same as Ultra HD?
In consumer-TV usage, “4K UHD” and “UHDTV 4K” refer to 3,840 × 2,160 pixels. The label “4K” is commonly used for this television format, even though the exact dimensions are 3,840 pixels across rather than a literal 4,000.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11“Ultra HD” can also refer to a wider system concept, not just a pixel count. ITU materials discuss UHDTV as including image-system parameters beyond spatial resolution. In cinema contexts, “4K” may be used differently; the television definition above should not be assumed to specify a cinema format.
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How does 4K UHD compare with 1080p and 8K?
| Format | Resolution | Total pixels per frame |
|---|---|---|
| 1080p HDTV | 1,920 × 1,080 | 2,073,600 |
| 4K UHDTV | 3,840 × 2,160 | 8,294,400 |
| 8K UHDTV | 7,680 × 4,320 | 33,177,600 |
The 4K and 8K dimensions are identified in the ITU’s 2016 summary of its television recommendation and in its 2023 definitions. At the same aspect ratio, 4K has four times as many pixels as 1080p. 8K doubles 4K’s width and height, giving it four times as many pixels as 4K overall.
More pixels do not automatically mean a visibly better picture in every setup. How much extra detail a viewer can see depends in part on screen size and viewing distance. The ITU’s 2025 BT.2246-9 report gives 100 cm as an example viewing distance for a 100-inch UHDTV image under a criterion of one pixel per one arc-minute. That is a technical example tied to a specific viewing criterion, not a universal seating recommendation.
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Does 4K mean HDR?
No. 4K describes spatial resolution; high dynamic range (HDR) is a separate imaging capability. ITU’s BT.2100 material addresses HDR approaches such as PQ and HLG and allows more than one resolution, including 4K and 8K. A 4K label alone therefore does not establish HDR support, a particular color gamut, or a particular brightness level.
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A 4K television’s panel is only one part of the viewing path. To see 4K detail, the content must be available in 4K and delivered through a compatible source and connection to the display. A 4K-capable screen does not, by itself, make every broadcast, stream, or video a native 4K image; lower-resolution material may instead be scaled to fit the screen.
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When checking a specific program or device, look for its stated output or playback resolution rather than relying only on the TV’s 4K label. Resolution and HDR should also be checked separately, since one does not imply the other.
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- Breathtaking picture: Sharp 4K brings out rich detail on our 55" flat screen TV, while the QLED screen and HDR10 create bright, accurate colors. Roku Smart Picture cleans up incoming TV signals, optimizes them, and chooses the right picture mode.
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- Seamless streaming: With fast Wi-Fi and apps that launch in a snap, Roku Select Series TVs get you to your entertainment quickly. You get excellent picture quality, clear sound, automatic updates, and more. It’s simple to use. Hard to outgrow.
- TV, simplified: With setup that only takes minutes, a simple-to-navigate Home Screen, and an uncluttered remote control that does all you need—Roku makes it easier to watch the TV you love.
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