What is the resolution of 2160x1080?

With Xiaomi MIX firing the first shot of full-screen mobile phones, full-screen mobile phones are now ushering in an explosion. Except for a few screen ratios, such as Samsung and Apple, most domestic full-screens currently have 18:9 2160x1080, and a few have 1440*720.

Then the question is, is the full-screen 2160x1080 considered a 2K screen? I guess many people don't know this. (Recommended learning: web front-end video tutorial)

First of all, we must clearly distinguish a concept. With K, 1K, 2K, and 4K are lengths. The one with P, 720P, 1080P, is the width. The concepts of K and P must be clearly distinguished.

Ifaccording to the internationally accepted definition, 2K is also called QHD (not qHD). The standard resolution is 2560x1440. Only when the length and width reach this or exceed this is it considered 2K. . However, 2160x1080 cannot meet the 2K standard and is between 1080p and 2k. Let’s call it 1080P or 2K-.

But what’s interesting is that according to the definition of the International Audiovisual Association, 4K resolution is 4096×2160 (UHD is 3840×2160, slightly smaller than 4K), and 2K is one-quarter of the area of ​​4K . Calculated this way, 2160x1080 is larger than a quarter of 4096×2160 (2048*1080), and can also be called 2K.

So how can it be considered reliable? Still prefer the former. That is to say, the definition of 2K is 2560x1440. Only when the length and width reach this or exceed this is it considered 2K. 2160x1080 cannot be counted as 2K, only 1080P. Even the iPhone X can only be said to be close to 2K, although its 2436*1125 resolution is not 2560*1440 in terms of length or width. Friends, do you understand?

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