On LED screens, the pixel pitch is the distance between each cluster of LEDs that makes up a pixel and is measured in millimeters.  

It ranges from 0.9mm for indoor LED screens for very close up viewing to 50mm for outdoor LED screens to be viewed from a distant area viewing.

Pixel pitch is extremely important when you choose an LED screen, 

but a smaller pixel pitch doesn't always make sense and can cost far more – it all depends on the distance the screen is being viewed from.  

Pixel pitch is partial factors from many that determine the quality of a giant screen, so don't be sold on that alone!