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How to find pixel density in LED Display Board? How do we compare pixel per inch and dots per inch?

In this example, a screen of 16'x9' is shown. How did they calculate 4875x2710P and 975x548p and so on. I know that they are adding more pixels for higher image resolution. I am very confused as I am not able to calculate it. I am attaching screenshot.

enter image description here

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  • $\begingroup$ pixel density is literally number of pixels divided by distance $\endgroup$
    – user253751
    Jun 14 at 8:38

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  • 4875 pixels at 1 mm pitch gives a screen width of 4875 mm = 4.875 m = 15.99 feet (16 feet).
  • 975 pixels at 5 mm pitch is also 4875 mm.
  • 244 pixels at 20 mm pitch is 4880 mm so it's almost the same.

How did they calculate 4875x2710P and 975x548p and so on.

They didn't. That's given in the datasheet. It's the count of the physical pixels on the display or projector.

How do we compare pixel per inch and dots per inch?

1 pixel = 1 dot. ('pixel' comes from "PICture ELement" with an X instead of a C.)

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