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Galaxy S7's 'Best Smartphone Display' Makes Strong Case for Apple to Shift to OLED iPhones
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Display PPI is not dependent on screen size. Only on resolution.
A 320 ppi display is 320 ppi no matter how inches wide or tall it is.
Same as a printer, which is the same DPI not matter how wide its carriage is.
It also depends on screen size.A 1080P on a 5 in screen will have a higher PPI than on a 6 in screen
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Dont worry.Apple doesnt think its exploding which is why they are using that very same OLED tech from the Note 7
You have no way of knowing what oled technology, or not, Apple is using. You can cite the rumors or speculate but no one knows as a fact.
1080 is a desired count of lines, which affects how tall you must make the display, depending on its PPI.
But the flat screen display's PPI doesn't change even if you cover most of the screen with a cloth. It's a fixed value.
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PPI is pixels per inch. That is a physical manufacturing value which does not change. It is always the same, no matter how much of the display is visible, or how large or small it is.
E.g. a 300 PPI display is always 300 PPI, whether it's 1 inch across or it's 100 inches across, or 1 row high or 1000 rows high. All that changes is the total number of columns or rows. The PPI is a constant.
(We are not talking about projectors here. We're talking about smartphone displays.)