# Why is PPI more important than resolution in the display?

पढ़े: हिंदी में
Do you know that a 32-inch full HD TV and a 65-inch 4K TV have approximately the same number of pixels in every inch of the display, and even a smartphone with a 6.5-inch full HD display has 5 times more pixels than a 55-inch 4K TV. We are talking about PPI ie Pixel Per Unit and why it is more important than the resolution of the display.

## What is the resolution in the display?

The picture or video we see in any display is made up of several small dots ie pixels and the more pixels the display screen has, the more clear the image or video we will see. In a digital display, we measure the resolution according to how many pixels are in the width and height of the display.

That is, if the width of the display is 640 and 480 pixels in height, then it will be SD quality screen if the width of the display is 1024 and height is 768 pixels, then the HD quality screen will be and if it is 3840 in width and 2160 pixels in height then it will be 4K resolution.

### Does the quality of the display improve with only higher resolution?

But whether the quality of the display is good or bad only by full HD or 4K resolution, not because the biggest factor in it is the size of the display. Because if the screen size will increase but the pixels will remain the same, due to this the number of pixels will decrease in every inch, due to which the picture quality of the screen will start to deteriorate.

This is the reason why a 4K TV has 4 times more pixels than a 32-inch full HD TV, because the PPI is also 4 times more in every inch of its display and its picture quality is also 4 times better. However, due to the size of a 32-inch full HD TV and a 65-inch 4K TV, the pixels will be almost equal in every inch of their display, due to which the picture quality in these two will be almost the same.

So if we want to know which display will look more clear according to the size of the different display, then we have to know the PPI of the display i.e. how many pixels are there in every inch of the display.

#### How to calculate PPI of display?

By the way, if you see the specification of the smartphone, then the screen PPI is given in it, but if you know the screen size and its resolution, then you can calculate it this way.

If we know the screen size and its resolution, then we can find the number of pixels in the diagonal of the display through the Pythagoras theorem. The PPI of any display can be determined by the number of pixels in the diagonal of the display divided by the size of the display.

PPI = Total number of pixels in the diagonal of the display / Diagonal length of the display
OR
PPI = Total number of pixels in the diagonal length of display / Display size.

Similarly, a 32-inch full HD screen with a resolution of 1920 * 1080 i.e. 1920 pixels in the width of the display and 1080 pixels in the height, the number of pixels in its diagonal will be 2202.9. Now if we were to divide the number of pixels in the diagonal by the size of the display to find the PPI of this display, it would be 68.84 (2202.9/32 = 68.84). The same number will be 68.84 PPI of this 32-inch full HD screen.

Similarly, calculating PPI of 65-inch 4k display comes to about 68 which is equal to 32 inches full HD display.

##### So isn't the resolution of the display important?

Resolution refers to the number of pixels in the display and this is important because if we compare two displays of the same size, the first one looks at the resolution of the display itself. But if we compare different display sizes, then we will always pay attention to PPI.

Anurag Dubey is an electrical engineer and also a professional blogger and writer. He has a piece of good knowledge about tech and gadgets and he is an open heart and mind and joyful person that loves to explore social and technological things.