What is the pixel size of 4k

The difference between UHD and 4K

What is “state of the art” in TV resolution today may be yesterday's pixel technology tomorrow. Within a few years, the resolution standards came into their own: HD ready was followed by Full HD, Full HD was replaced by 4K, and with 8K the next standard is already moving into the living room. Regardless of this, these abbreviations keep causing confusion. The difference between UHD and 4K in particular raises questions, as many assume that this is the same standard - but this is not (entirely) correct.

Classify resolution correctly

The resolution of an image is usually specified in terms of the number of horizontal and vertical pixels, i.e. the number of pixels on a screen. HD ready means, for example, that an image has a resolution of 1,280 pixels on the horizontal axis and 720 pixels on the vertical axis. Pixels are building blocks of an image which - equipped with a corresponding color value - create the overall picture like tesserae.

It should be noted that the pixel specification alone only provides limited information about how sharp the image on a screen actually is for the human eye. Rather, the resolution should be set in relation to the size of the screen. Only then does the density of the pixels on a screen emerge. The pixel density is in the unit PPI (Pixels per inch). For example, Full HD achieves a significantly higher pixel density on a 32-inch television than on a 40-inch device: the display is therefore finer.

Devil articles for your home theater

UHD and 4K briefly explained

  • UHD: The abbreviation UHD stands for "Ultra High Definition". This is the successor standard to Full HD. The resolution of UHD is 3,840 x 2,160 pixels (= 8,294,400 pixels in total) and is four times as high as that of its predecessor, Full HD.
  • 4K: The term 4K comes from cinema technology and is now also used colloquially for televisions - although this is technically not entirely correct. 4K refers to the horizontal resolution of 4,096 pixels (4K = 4 kilos, so four thousand). The number of vertically arranged pixels in televisions is 2,160 pixels (2K). This is why one sometimes comes across the name 4K2K. Strictly speaking, a UHD television does not achieve the resolution of a 4K device because the number of horizontal pixels is lower. In practice, however, the terms UHD and 4K are used almost synonymously. This is why many televisions “only” have a resolution of 3,840 x 2,160 pixels, even though they are designated as 4K devices.

Other important abbreviations for screen resolutions:

  • 8K: 8K stands for 7,680 x 4,320 pixels. In the meantime, some devices with this resolution are already on the market. For them, however, you sometimes have to dig deep into your pocket. Manufacturers such as Samsung and LG are pioneers here.
  • Full HD: The Full HD standard offers a resolution of 1,920 x 1,080 pixels. You will usually find this resolution in movies from Blu-ray Discs. Real 4K resolution, on the other hand, is only offered by Ultra HD Blu-rays.
  • HD ready: With televisions, the HD-ready resolution is with 1,280 x 720 pixels almost gone - even smaller new devices usually support at least Full HD. The HD-ready standard is mainly encountered today when receiving high-resolution television programs.

Why the resolution isn't everything

Until a few years ago, the development of flat screen televisions was mainly about achieving higher resolution. That has recently changed: instead, the Color and contrast display brought into focus. The aim is to reproduce the contrasts between “particularly light” and “particularly dark” as naturally as possible.

The technical pioneer is once again the Dolby company with its Dolby Vision technology.

Fed up with bass in the home theater

High definition for eyes and ears

An ultra-sharp picture in UHD or 4K resolution is only worth half if the sound quality cannot keep up. Teufel systems deliver the complete package of Blu-ray player and high-resolution sound.

  • ▶ Columa 300 with Impaq 8000: The 5.1 set consists of four elegant column speakers, a massive subwoofer (depth up to a frequency of 43 Hz) and the high-end Impaq Blu-ray AV receiver. For the best sound quality, it supports the lossless formats Dolby True HD and DTS HD.
  • ▶ Cubyon Impaq: high-resolution sound has never been so easy to implement. The compact high-end satellites made of aluminum are particularly suitable for wall mounting and the flat sub can be set up wirelessly and therefore flexibly.

Conclusion: the difference between UHD and 4K is hardly relevant

  • The common standards for screen resolution are HD ready, Full HD, UHD and 4K.
  • Today, UHD and 4K are often used synonymously as the successor to Full HD.
  • The term 4K originally comes from cinema technology and describes a resolution of 4,096 horizontal pixels.
  • The UHD resolution of most televisions, on the other hand, is “only” 3840 x 2160 pixels.
  • There are now the first TV sets that already have 8K resolution. However, these are not (yet) affordable for everyone.

Video: WTF is actually 4K (6K, 8K) ?!

Cover picture source: Shutterstock / Redpixl.pl