# Is 4k display a high-definition resolution LED display? What do 720P and 1080P mean?

Mar 10,2021| LED Knowledge

Now, the word 4K often appears in various TV advertisements, so many customers often require 4K high-resolution LED displays. But is it really necessary to get a 4K?

In fact, from a practical point of view, it is the most economical and effective way to choose a suitable screen size and dot pitch.

Since that's it, let's talk about it today, what is high-definition resolution and what is 4K?

Does it have more pixels than Ultra HD?

If 4K is four times that of 1080P, is 4K equal to 4320P?

The above three questions are answered in order: It depends on the situation: sometimes it is like this: no.

'P'

720P, 1080P, etc., means "the total number of lines of video pixels", for example, 720P means that the video has 720 lines of pixels, while 1080P means that the video has a total of 1080 lines of pixels. A camera with 1080P resolution usually has 1920* 1080. "P" itself means "progressive scan", which is the abbreviation of Progressive, as opposed to interlaced.

'K'

2K, 4K, etc., means "the total number of columns of video pixels", such as 4K, means that the video has 4000 columns of pixels, specifically 3840 or 4096 columns. A 4K resolution camera usually has a pixel count of 3840*2160 or 4096*2160.

'MP'

MP is the total number of pixels, that is, the result of multiplying the number of rows (P) and the number of columns (K) of pixels (megapixels). For example, for a 1080P camera, 1920 pixels are multiplied by 1080 pixels to get the total number of pixels of 2MP (megapixels).

1080P (or Full HD)

In the past, vertical resolution was used to describe resolution. Therefore, 1080p represents the vertical resolution. The aspect ratio of almost all high-definition displays is 1.78:1 (that is, 16×9, also known as "widescreen"), which means that its horizontal resolution is 1920 pixels (that is, 1920×1080).

This is another reason why people are currently confused about the concept of resolution. After all, we talked about vertical resolution when discussing TV resolution in the past few decades. Now it has suddenly become "4K" which means horizontal resolution. , Everyone is confused.

Therefore, 1080p does not equal "1K". Just as Ultra HD is equivalent to 4K, 1080p is equivalent to 2K. In other words, the resolution of 1920×1080 is very close to the 2K standard described by DCI. Even so, most people often don't call 1080p 2K, they call it 1080p or Full HD.

The number of pixels of 720p is about half of that of 1080p.

4K

Let’s start with the current market’s top resolution 4K, so that we can talk about the basic principles to be described when answering most resolution doubts.

Technically speaking, "4K" means a horizontal resolution of 4096 pixels. This is the resolution proposed by the Digital Cinema Initiatives. Because the aspect ratio of the movie is different, the exact shape of the rectangular screen determines the aspect ratio of the movie, so its vertical resolution is not specified.

Therefore, strictly technically speaking, "4K" is not ultra-high-definition, and the resolution of ultra-high-definition is 3840×2160. The pixel difference between the two is only 13%, which is basically not much difference. Most people prefer the name "4K" for Ultra HD.

The truth of 8K is the same as 4K. If you are talking about a display, then its horizontal and vertical pixels are twice that of a 4K display: 7680×4320. However, there are not many 8k video sources. We are still far away from 8K becoming the mainstream, so I won’t talk about it separately. The standard resolution of Super Hi-Vision is 7680×4320, and the total number of pixels is up to 33 million; for better support With naked-eye 3D display technology, the Super Hi-Vision frame rate has been uniformly increased to 120fps; the standard viewing distance and viewing angle mode have also been greatly improved.

The figure shows the number of pixels in each major resolution format. Of course, this is not the actual size, but a visual representation. From largest to smallest: 4k technology, screen aspect ratio 1.78:1 (black part); UHD (white part); 2k technology, screen aspect ratio 1.78:1 (green part); Full HD 1080p (red part); 720p (The blue part). Of course, we almost never saw the word "2K" before "4K" became common. It often refers to "standard format". Most digital cinema projectors used in theaters have a resolution of 2K (some projectors have a lower resolution). Similarly, according to DCI, it only specifies a horizontal resolution of 2048, and a vertical resolution is not specified.

Display resolution

Display resolution: WUXGA, WXGA, WXXXGA, WXCBGBSA and WXLADYGAGA In the computer world, people use these puzzling, shocking non-user-friendly messy letters to describe resolution. Oh, that's wrong, it doesn't shock the "people", after all, they are all computers. Basically, the ones we are most likely to see are FHD (1920×1080) and WUXGA (1920×1200). For the rest, you can prepare a cheat sheet and copy it down to remember. Fortunately, we only encounter these letter combinations when we are looking for a cheaper projector or computer monitor.

You can intuitively experience the following pictures:

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