Ultra HD, Full HD, HDR, and 4k – the notional diversity of modern digital technology can be confusing. While HD is only for "high definition" and makes it clear that the image quality in the numeric field is generally better than previous analog formats, there are now many different techniques for image representation on the market.
What does it mean that my new TV is 4k capable? How does the image differ from that of a full HD device? Justified questions, because in the subject of image quality, the resolution does not just play a role. We'll clear up. You can also see my other article about choosing better 4k television in more detail.
What is Ultra HD and The different image formats and their meanings
To understand the development of image resolution in the TV and monitor area, a look at the past and the development of the display technology is worthwhile. A tube television, which dissolves according to the so-called PAL Standard, represents its contents with 788 x 576 image points. Thus, a single image consisted of approximately 450,000 individual pixels, which were output in line with 50 frames per second. As a result, there was always a slight flickering and details disappeared especially on giant TVs in the blur of the low image resolution. Today, some screens support up to 8k resolution. This results in a resolution of 7680 x 4320 pixels or more than 33 million image dots. So if you find specific resolution labels on a device, they mean the following:
HD: The device supports an image resolution of at least 960 x 720 pixels. If the lowest resolution of the television standard High Definition television (720p) is meant, the decision is 1280 × 720 pixels.
Full HD: The device resolves with 1920 x 1080 pixels. This is the current most common standard.
UHD/UltraHD 4k: A display of 3840 x 2160 pixels is possible on the device with an aspect ratio of 16:9. The image has both horizontal and vertical double resolution like Full HD and thus about four times the image resolution. Modern devices already have this resolution, and more and more image material is offered in 4k resolution.
UHD/UltraHD 8k: The device can represent up to 7680 x 4320 pixels. This, in turn, corresponds to the four-fold image resolution of UHD 4k. Since the required Bitrate for such an image is at 24 gigabits per second, there are so far little use cases for this technique. ...
So-called curved TV's are a case in point: they have a curved screen surface and should thus involve the viewer even more in the events shown. The screen size itself is usually specified in inches. An inch is equivalent to 2.54 centimeters. A television with a capacity of 50 inches thus has a screen diagonal of 127 centimeters.