In the end what is the relationship between the screen size, resolution, pixels, PPI
Let's start from the phone talking about it. First on a map, for everyone to take a look at some of the parameters on the screen of the phone. Red box of three parameters, it must not unfamiliar, I'm not familiar with. But really speaking, not so long ago, I could not even phone's screen size in the end is how come do not know. Here we begin to speak slowly. What screen (main screen) size, how to count? The picture below is the size of the Huawei glory of Figure 7, written on the chart is 5.2 inches. Well, this 5.2 inches in the end is how come it? Before saying this, we first conduct some alternate units. We usually are not inch of this unit, we are using millimeters, centimeters, meters these units. So how is the conversion between inches and millimeters, centimeters it? I do not know, so I Baidu a bit. 1 inch (inch) = 2 .54 centimeters (cm) Equivalent to our original one inch 2.54 cm so long. Now let us return to 5.2 inches in the end is how counted out the problem. The beginning, I think probably is the area of the phone screen there is so much of it, but then I inch up after Baidu, only to find himself how stupid. Because inches is the unit of length, area said to use a unit of area, inches obviously can not represent the area. From this point, I denied my thoughts. In fact, we are talking about the length of the phone screen is 5.2 inches diagonal.
I say this, a little math common sense to know the phone's screen size is how to count the bar. Yes, that the Pythagorean theorem, knowing the length and width of the phone screen, and then use the Pythagorean theorem, the hypotenuse of length can be worked out. There is a more simple way, just look at it with a ruler to measure the diagonal is how many centimeters, then converted to inches to get.
Resolution is what the hell?
The figure above shows, Huawei glory resolution is 7 * 1920PX 1080PX. Well, this resolution is how it happened? We may note, the 1920 and 1080 related to the words behind the PX, the PX is what we are familiar with pixels, and the pixels behind we speak, now as long as you understand that the pixel resolution of the unit is just fine.
Before explaining the resolution, we need to understand a concept. Presented on our phone line, a face, an image is the smallest unit pixel represented, you can simply understood as consisting of a small box. Take a look at this picture you will understand.
So, the resolution 1920px * 1080px, which means that, in the 5.2-inch screen of the Huawei glory 7, 1920 block of pixels in the vertical height, there are 1080 block of pixels on the width of the lateral.
Here Laijiangjiang resolution than what is?
You may have noticed, the phone's screen is rectangular, high or 1920px, width is 1080px. You will find a little calculation, the height and width ratio is 16: 9. When it comes to 16: 9 ratio this, students must often see the video is not a stranger.
There are various mobile phone screen resolution ratio, this ratio can be seen as you size than the phone screen. According to Baidu Baike display, phone resolution 1920px * 1080px reason expressed in this form, but also to facilitate represents the size of the phone screen.
Here's size, it should mean that the size of the phone screen it. In fact, to tell you the resolution of a cell phone, you really will be able to calculate the size of the phone screen it? So, what is even worse conditions in order to calculate the size of the phone screen it?
What is the screen pixel density?
Screen pixel density, that is, the number of pixels per inch screen have, the English referred to as PPI. When every inch of the screen read this, I have deep doubts, this is not every square inch per inch short of it? Facts have proved that I was too young,
that inch with size before the phone screen, just as the length of the diagonal. So, we can understand screen pixel density, that is, in a diagonal length of the number of pixels within one inch squares have. Here, we may still have some doubts, all right, then see below.
What is the relationship of the screen pixel density, resolution, screen size is that?
This formula is really simple, to give us a lot of questions to solve. We still get the Huawei glory 7 phone, for example, we know that its size is 5.2 inches, with a resolution of 1920px * 1080px (1920px is the formula in the longitudinal direction, 1080px formula is in the horizontal).
You do not believe it would use the formula to count the conclusion that the PPI, is not that 424ppi. I figured, the result is 423.6359942465958, rounding know the students know that the 424 is an approximation.
Computer screen can adjust the resolution, is it by adjusting its pixel size to achieve?
People give you the recommended system is 1366px * 768px resolution, you know what it means? Yes, Microsoft on this screen transversely 768 pixels, 1366 pixels vertically disposed. And then how to pull this number is not changed.
So, why can I adjust the resolution of it? If I was adjusted to 800px * 600px, by definition, it is the lateral 600 pixels, 800 pixels vertical is ah. Actually, you tune into a 800 * 600 resolution, the system will assign you an effective number of 800 * 600 pixels, which is the true color blocks.
Other number it, given a free hand by the system, through a series of simulation calculation gives you a color block, just filled to 1366 x 768 color patches. These pixel blocks used to charge number, and the real pixel blocks put together. Like a regular army, which mixed with a lot of the same motley crew, only the team with the bad.
PPI big phone displays the finer effect?
In fact, the clarity of the screen is the resolution and size of the joint decision, as measured by the clarity of the screen ppi index more accurate.
Screen size is fixed, the higher the resolution, PPI, the higher it?
Yes, look at the formula
Fixed resolution, big screen size, PPI is not for less?
Yes
PPI unchanged, larger screen size, resolution is not also become large?
Yes.
From: Portal