The pixel pitch is specified in millimetres (e.g. P1.5 = 1.5 mm dot pitch). This determines the pixel density per square metre and thus the native resolution of the wall surface: at P1.5 this is 444,444 pixels/m², at P2.5 it is only 160,000 pixels/m².

The rule of thumb for the minimum viewing distance is: pitch in millimetres × 1.0 to 1.5 = recommended distance in metres. A 2.5 mm pitch works from 2.5–3.7 m, a 0.9 mm pitch from 90 cm. This formula is based on the resolution limit of the human eye (one arcminute at a visual acuity of 1.0) and applies to uniformly bright content. For fine text, tables, or CAD drawings, a significantly smaller pitch is required.

For pitches below 1.5 mm, the underlying housing technology becomes critical: classic SMD LEDs become mechanically unstable, while COB (Chip-on-Board) and IMD (Integrated Matrix Device) solve this by combining several chips in a protected resin or collective housing layer.

In terms of economics: every step down in pitch roughly doubles the number of LEDs per m² and thus the hardware costs. A 0.9 mm pitch typically costs 5–8 times that of a 2.5 mm pitch. The art consists of selecting the pitch to match the actual viewing distance and content type — not for marketing impact.