The total pixel number is calculated from the size of the LED display, PH value(pixel pitch) and display resolution.

E.g.:
Pixel pitch: P16
Display dimensions: 15360mm(width)x4608mm(height)
So the display resolution is calculated as below:
15360/16(width)x 4608/16(height)= 960 x 288

And the total pixel number is:
960x288=276,480