What is pixel per inch (PPI) in display specifiction Why is it important to know?


It’s the pixel density per square inch, and knowing that for your smartphone and TV display is important but lets first see the formula to calculate PPI

[{(𝐻𝑜𝑟𝑖𝑧𝑜𝑛𝑡𝑎𝑙 𝑅𝑒𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 ✖ 2 ) ✖ ( 𝑉𝑒𝑟𝑡𝑖𝑐𝑎𝑙 𝑅𝑒𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 ✖ 2 )}1/2}] ➗ 𝐷𝑖𝑎𝑔𝑜𝑛𝑎𝑙 𝑠𝑖𝑧𝑒 𝑜𝑓 𝑡ℎ𝑒 𝑑𝑖𝑠𝑝𝑙𝑎𝑦 

👉Eg: If the resolution is HD and the screen size is 6 inch

{(1280 X 2) X ( 720 X 2 )} raised to 1/2 = 1468.6 pixels

1468.6/6 = 244 PPI ❗

👉It’s difficult for the human eye to decipher beyond FHD ( 1980 X 1080 ) so if you have a 4K screen it would require more processing power and in the smartphone will drain the battery and in PC’s will require more power .

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