What does pixel pitch actually mean in real projects?

Pixel pitch (P1.2 / P1.5 / P2 / P2.5 / P3.9) is the distance between LED pixels in millimeters.

In real-world AV design:

• Smaller pitch = sharper image at close viewing distance
• Larger pitch = lower cost, but requires more viewing distance

Rule of thumb used by integrators:

Viewing distance (m) ≈ Pixel pitch × 2.5–3

So a P2 indoor LED display is typically not meant for 1–2 meter viewing.