with some really popular smartphones such as a Samsung Galaxy Note 4, LG G3 and the newer Samsung, Galaxy S6 being released in Quad HD resolutions, more and more people are wondering just what does Quad HD stand for exactly?
Now obviously it isn’t that hard to figure out what Quad HD is, but people are getting confused because you have Quad HD, you’ve got 4K, you’ve got Full-HD and you even have something called QHD; as well as another qHD where the q is a lowercase letter. So when you use the uppercase QHD and the lowercase qHD, they actually mean two different resolutions. So let’s a dissect resolution by resolution and put all this in perspective, then you have complete knowledge of what it means, when we talk about Quad HD, 4K, Full HD and the regular HD resolution, let’s dive in.
What is Quad HD Display?
HD (High Definition)
Let’s start off with HD. HD means high-definition and it stands for 720p and the corresponding resolution is 1280 by 720 pixel. This resolution is hardly used on the newer cell phones anymore. You either get 1080p or Quad HD in today’s smartphones.
Next up you get Full HD which is 1080p resolution which we find on most of our newer high-definition TVs and on most of our current generation cell phones. So the resolution is 1920 by 1080 pixels.
Then we have got Quad HD which stands for 1440p. This is mostly for the latest and greatest smartphones such as the Samsung Galaxy Note or the Samsung galaxy S6. The corresponding resolution is 2560 by 1440 pixels.
And finally we have 4k, which isn’t Quad HD as some people think. 4K is 2160p, this is found on Ultra High Definition TVs and it has nothing to do with the smartphones, except when we say that a smartphone can record in 4K.
When we say that, that means the smartphone can record in 2160p which is 4K and the corresponding resolution is 3840 by 2160 pixels. Another interesting thing is the relation between the HD and Quad HD. As you know HD 720p (we just talked about that) and Quad means 4; so when you take quad and you put it in front of HD that means four times HD and you can do the math.
So let’s take HD really quick and see how many pixels that translates to. 1280 by 720 multiply those two numbers and you get 920,600 pixels. Quad HD is 2560 by 1440, so if you multiply those two numbers 2560 by 1440, the answer is 3,686,400 pixels. Now if you divide the number of pixels you get from Quad HD by the number of pixels you get from HD, the number is going to be 4; so you see when you take quad and you slap it in front of HD, that means you get four times that’s 720p.
Now I did mention in the beginning of this post that you’ve Quad HD and you have QHD and then you have a lowercase qHD. Let’s take a look at the differences. The uppercase QHD is simply the shorter version of quad HD but the lowercase qHD is actually a very old resolution and it translates to 60 by 540, also known as 540P. Interestingly enough the iPhone 4 and the 4S had a resolution of 960 by 640 which is almost QHD but not quite.
And finally another interesting relation between 4K and full high-definition; 4K is supposed to be 4 times that of full high-definition as far as pixilation goes (Pixel amounts go). So let’s do the math really quick, 1080p is 1920 by 1080, so let’s multiply those numbers and what we do get is 2,073,600 pixels. If you take 4k that is 3840 by 2160 and if you multiply those numbers, you get 8,294,400 pixels; divide two numbers and you get the number 4. It all makes sense.
So here is a quick summary of everything we talked about, you got the HD resolution which is 720p found on some old phones and HD TVs, then you get the full HD which is quite common, it’s called 1080p and you can find this on most new phones and high-definition TVs; and then you get the Quad HD which is 1440p, mostly found on the latest and greatest smartphones and finally you’ve got the 4K which is 2160p which we can find on the most recent Ultra high-definition TVs as well as when we say that a phone is able to record at 4K, this is the resolution you’re talking about. But don’t confuse 4K with Quad HD; remember Quad HD is four times that of regular HD and 4K is four times that of full HD.
I do want to say that I did omit to mention some of the resolutions out there but these are the ones I think are most relevant for this post content. If you have any questions comments concerns throw them down in the comments section below.