What is PPi Pixel Density in mobile? The PPi Pixel Density meaning in a phone is how close the pixels are packed together on the phone screen. PPi means Pixels per inch and is relation between screen size and resolution of the phone. You can easily calculate Smartphone PPi Pixel Density, by first calculating the length and breadth of the sides of the phone screen from the diagonal phone size using the Pythagoras method theorem as shown in the phone PPi calculation here.
How to calculate PPi Pixel Density for a 4 inch diagonal screen with a screen resolution of 720x1080 pixels is shown here. First the width and height of the phone screen is worked out as follows:
The PPi Pixel Density calculator of cell phones shown here demonstrates how the Pythagoras method is used to calculate the dimensions of the sides of a 4 inch screen. Note that we assume the height to be 'h' and since the ratio of the width 'W' to height is 1080:720, the height will be W x 1080/720 or h=1.5W. As shown in the calculation here, using the 4 inch diagonal screen size of the phone, we get the dimensions of the sides of the phone screen as width=2.63 inches and height as 3.945 inches. Now we will use this result to calculate the pixels per inch or PPi of the mobile phone.
PPi of mobile phones
The PPi of mobile phone screens are calculated by dividing the number of pixels along either the vertical or horizontal axis by the length in inches of the corresponding side. Here to find the PPi we do the calculation: divide 720 pixels by 2.63 inches or 1080 pixels by 3.945. The result we get in either case is 273.764 ppi.
Highest PPi Phones, best PPi phone
The human eye cannot easily distinguish the difference in PPI when the figure reaches a saturation point of about 300 PPi. So the minimum PPi for a smartphone should be about 300 PPi, but the best PPi pixel density phone can be of a higher pixel density.
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