Explanation of Pixel Density in Mobiles

Pixel density in Mobiles is the measure of Pixels available per unit area. Measuring unit of Pixel Density in Mobiles is PPI (pixels per inch).

Pixels of iPhone 4 Retina Display

Magnified Pixel View of iPhone 4 retina display

Let me introduce you to some terms and their Meanings

What is Pixel ?

A tiny dot so an screen display is called Pixel. “A Pixel is a single point in graphic image“. A tiny illuminated area on a display and many such points forms an image.


PPI which in full form written as “Pixel per inch” is a measurement of Pixel Density in mobiles. Calculation of PPI makes use of much famous Pythagoras Theorem.

Pixel Density in Mobiles Illustration Explanation

PPI is calculated by dividing Diagonal Pixel by Diagonal Size of screen (width and height). Where, Diagonal pixels are calculated by taking square root of the sum of squares of width and height in pixel.

PPI = (Diagonal Resolution Pixels/Diagonal display size in inches)

Screen Resolution

Screen resolution is the number of pixels displayed by screen in horizontal and vertical manner. Horizontal length is termed as width while vertical is named as height. e.g. 1280 x 720 pixel resolution.

Discussion Created on Pixel Density in Mobiles

Many websites are reviewing and comparing smartphones in their specification, lowest online prices, performances, speed, power.

In the same arena, Pixel density in mobiles is compared by tech and mobile reviews and people started to take PPI in account while making the purchasing decision of a mobile.

This created competition among mobile manufacturers and they turned on the race on Pixel density in mobiles. Apple introduced iPhone 4 by advertising retina display on device with 330 PPI.

Since then, competitors tried to win race by introducing Samsung Galaxy S7 Edge with 577 PPI and Till 2016, Sony Xperia Z5 Premium have highest 806 Pixel density in mobiles.

Do I need to care about Pixel Density in Mobiles ?

Yes, Pixel density in mobiles matter a lot. For mobiles with below 150 PPI, you should clearly give a no as picture quality will be poor and you may experience problem in reading and watching.

Mobiles with 150 to 250 PPI, it is acceptable while close to 250 PPIs are good in user experience and good charpness. You can purchase the mobile with these pixel densities.

If PPI is between 250 to 400, you should very clearly go for these mobiles it picture quality and sharpness ranges from very good to excellent as the ppi increases.

Now if Phone has PPI greater then 400 then it will come with a high price tag. If you have budget then you can go for any higher pixel density mobile. But thing here that must be noted that is ” naked eye can’t differentiate between 400 and 600 PPI screens” they both looks and appears same to our eyes.

Our eye can detect upto 399 pixel density in mobiles. So it is clearly of no use but as the size of screen increases, higher pixels may be required for better picture quality.

You can also read about : Form Factor in Mobile || Hybrid Sim Slot

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