Pixel pitch in four facts
It’s a distance, in millimeters
Pixel pitch is the gap between the centers of two adjacent LEDs, measured in mm. A 2.6mm wall has its pixels 2.6mm apart; a 3.9mm wall, 3.9mm apart.
Smaller pitch = more pixels = sharper
A smaller number packs more pixels into the same area, so the image is denser and you can stand closer before you see the dots. It also costs more per square foot.
It sets your minimum viewing distance
A common rule of thumb: the retina/comfortable viewing distance in meters is roughly the pitch in millimeters (a 4mm wall looks clean from ~4m back). Closer than that and the pixel grid becomes visible.
Indoor vs. outdoor pitches differ
Indoor walls are typically tighter (≈1.2–4mm) because audiences sit close; outdoor walls are coarser (≈4–10mm) because viewers are farther away and brightness matters more than density.