Pixel pitch is the gap between two LED dots, in millimetres (P2.5 = 2.5 mm). The simple rule: at about 3 × the pitch in metres, people stop seeing individual dots. So P1.25 looks perfectly smooth from about 4 m, P2.5 from about 7.5 m and P10 from about 30 m.
The 3× rule in one line
Multiply the pitch by 3 and read the answer in metres. That is the distance where the picture looks seamless. Closer than that, the image is still clear, but someone looking carefully will see a fine dot grid. Closer than 1 × the pitch in metres, the dots are obvious.
Distance table
Why not just buy the finest pitch?
Finer pitch means more LEDs per square metre, so it costs more and needs a more powerful controller. If nobody stands close to the screen, you pay for detail no one sees. Choosing the pitch for the real viewing distance usually saves 30–50% compared with going one or two steps finer than needed.
Three questions that decide it
- Where will the closest regular viewer stand? (Not the person cleaning it — the customer, the guest, the audience.)
- What will you show? Small text and spreadsheets need finer pitch than video and images.
- How big is the screen? A small screen with coarse pitch has very low resolution — a 2 m wide P4 screen is only 500 pixels across.
