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Pixel pitch, also known as dot pitch or line pitch, is a measurement of the distance between two adjacent pixels on a display. It is measured in millimeters (mm) and is typically used to describe the sharpness of a display. The smaller the pixel pitch, the sharper the image will be. Pixel pitch is determined by the number of pixels per inch (PPI) of a display. The PPI of a display is determined by the number of pixels that can fit into a one-inch area of the screen. A smaller pixel pitch means that the display will be able to show more detail and have sharper images. 

The pixel pitch of a display refers to the center distance between two pixels. A P4 = a pitch of 4mm = the distance between two pixels is 4mm. A lower pitch is say that the pixels are closer together and therefore deliver higher image quality. Pixel pitch is similar to resolution with the smaller pixel pitch giving you the best resolution.

But also remember that the price will go higher and in some situations, it is a waste of money to have the smallest pitch at a far distance. Since the human eye can not see those details from afar.