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One of the first things you see when shopping for a TV is its resolution. You'll often see the resolution slapped right on the box or even in the model name. 4k TVs started to dominate the TV market in the middle of the 2010s, and they soon took over from 1080p as the most common resolution found on TVs. Almost every TV from big manufacturers has a 4k resolution, and it's actually hard to find 1080p TVs now, but what exactly are the differences between each
4k and 1080p refer to the resolution of the display. A 1080p TV has 1920 horizontal pixels and 1080 vertical pixels, while a 4k TV has 3840 horizontal pixels and 2160 vertical. It can get confusing because 1080p refers to the number of vertical pixels (1080), but 4k refers to the number of horizontal pixels (3840). So while the name makes it sound like a 4k display has four times the amount of vertical pixels, in actuality, the amount of vertical and horizontal pixels on a 4k display are each double that of a 1080p display. However, this means that overall, a 4k TV also has four times the total amount of pixels as a 1080p TV, which you can see in the table below.
There are different marketing names for each, but having a 4k TV doesn't necessarily mean it's better than a 1080p; there are many different factors that affect the picture quality. A higher resolution simply means it supports more content and delivers crispier images. You can see some of the differences between 4k and 1080p below. You can also read about resolution here.
As 4k TVs are the norm, native 4k content is also easy to find on most streaming apps like Netflix, Disney+, and Amazon Prime Video. Physical video sources, like Blu-ray players and gaming consoles, are starting to support a 4k resolution as well, but they were limited to 1080p for a long time. Regular Blu-ray discs are 1080p, and there are now 4k Ultra HD Blu-ray discs as well, but it's an entirely new format and requires you to upgrade your Blu-ray player and purchase new 4k Ultra HD Blu-ray discs. The original Xbox One and PS4 were limited to 1080p, and then the PS4 Pro and Xbox One X/S, followed by the PS5 and Xbox Series X, were each released with 4k support.
It's becoming harder to find 1080p TVs in the 2020s, and they're usually limited to small, entry-level models. If you have limited space and need a small TV, you'll likely need to get a 1080p model, since 4k TVs are usually available in larger sizes.
The two photos above illustrate an identical image at different native resolutions, which means the image's resolution and the TV's resolution are exactly the same. The first photo is a 4k image displayed on the Hisense H9G, and the second is a 1080p image displayed on the TCL 3 Series 2019.
Native 4k content is very popular, especially on streaming apps, but some of what you watch may still be lower-resolution content upscaled to UHD, which will look different from native 4k. To present lower-resolution material on a 4k TV, the TV has to perform a process called upscaling. This process increases the pixel count of a lower-resolution image, allowing a picture meant for a screen with fewer pixels to fit a screen with many more. However, it doesn't increase the detail of the image since the signal has the same amount of information. Above you can see the difference between a 1080p resolution on the 4k Hisense and on the 1080p TCL.
HDR, which stands for High Dynamic Range, started to become more popular around the same time as 4k TVs. While it's often marketed together, it has nothing to do with the resolution and actually refers to the colors and luminance. It allows content creators to use a wider range of colors and luminance levels. It helps improve the picture quality and produces richer, more vibrant colors. There are different HDR formats, and you may see some companies advertise 4k HDR, but just because a TV supports it doesn't mean that HDR looks good. However, the large majority of 1080p TVs don't even support HDR, so if you wan