Four numbers, one of which matters
A 55-inch video wall datasheet runs two pages. Four numbers decide whether the wall reads as one image or nine televisions: combined bezel gap, brightness, factory brightness setting, and signal topology. The rest is procurement decoration.
The gap is double what the brochure says
Marketing quotes one edge. What you see is both edges plus the seam. A 3.5 mm panel shows about 7 mm of dark line; 1.7 mm shows 3.4 mm; 0.88 mm shows 1.8 mm. The distance at which the line stops being visible is roughly 1,000 times that gap, which is where the table below comes from.| Panel | Combined gap | Line disappears at | Price index | Wall flatness |
|---|---|---|---|---|
| 55" 3.5 mm | 7 mm | ~7 m | 100 | 3 mm / 3 m |
| 55" 1.7 mm | 3.4 mm | ~3.4 m | 112 | 2 mm / 3 m |
| 55" 0.88 mm | 2 mm | ~2 m | 135 | 1 mm / 3 m |
What the wall behind the panel has to be
A 0.88 mm wall needs a substrate flat to within a millimetre across the full span, brackets adjustable on two axes, and a room that does not swing more than a few degrees in temperature. Lightweight block partitions rarely qualify. We have turned down two projects on that basis, because the wall would have looked worse than 1.7 mm within a year and we would have been blamed for it.
Where the premium earns its keep
Retail windows with the wall three metres from the pavement. Boardrooms where the camera points at both the presenter and the screen. Control rooms with an operator desk two metres from the wall. Anything that will be photographed, streamed, or compared with a second wall in the same building.
Three questions for the supplier
What is the combined gap, measured not quoted. What is the factory brightness setting at handover. What happens to the other eight panels when panel six loses power. A supplier who answers all three in a day has thought about the wall. One who answers with a brochure has not.