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
[{(π»ππππ§πππ‘ππ π ππ πππ’π‘πππ β 2 ) β ( ππππ‘ππππ π ππ πππ’π‘πππ β 2 )}1/2}] β π·πππππππ π ππ§π ππ π‘βπ πππ ππππ¦Β
πEg: 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 β
πIt’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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