Application
LED display for a control room
A control room wall is specified from operator sightlines and desk layout, because the people reading it sit at a fixed distance for a whole shift and cannot move closer to read a label.
Reading distance is fixed
Operators sit where the desks are, so the pitch is set by the shortest and the longest sightline in the room. Small text and fine map detail set the limit.
Uptime and access
A control room runs continuously. Modules are replaced from the front while the wall stays live around them, and spare modules are held on site.
Colour consistency
Screens that run all day show drift between cabinets. Cabinets come from one calibration batch, and a spare is calibrated to the wall before it is stored.
Why a control room is specified from the last desk
A control room is specified from the last desk, not from the wall.
- The longest sightline sets the pitch
- Operators sit where the desks are, and the far seat is the one that fails first. P0.9–P1.5 holds small labels and map detail across a 3–8 m room; a wall sized in square metres and pitched for the front row is the usual mistake.
- On-camera use sets the refresh
- A control room is photographed and streamed. At 3,840 Hz with 16 bit grey there is no banding on a phone camera held at the desk; lower refresh shows as moving bars on a monitor that is not the wall.
- Shift length sets the brightness and the heat
- Screens run continuously, so 600 cd/m² is held as a working level rather than a peak. Lower output and an even grey field matter more over a twelve-hour shift than a brighter number on a data sheet.
- Continuous operation sets the service
- Modules are replaced from the front while the wall stays live around them, and spares are held on site and calibrated to the wall before they are stored.
| Room condition | What it rules in | What it rules out |
|---|---|---|
| Seats at 3–8 m, small labels and map detail | P0.9–P1.5 to the far seat | A pitch chosen for the front row |
| Wall photographed and streamed all shift | 3,840 Hz · 16 bit grey | 1,920 Hz walls that band on camera |
| Wall live 24/7, no shutdown window | Front module access, spares on site, calibrated before storage | Rear-only access and uncalibrated spares |
Boundary. We do not design the desks, the software, the room lighting or the operator workflow.
Why does refresh rate matter in a control room?
At 3,840 Hz with 16 bit grey a phone camera shows no banding; lower refresh shows moving bars.
What pitch for reading small text at 6 m?
P0.9–P1.5, set by the far seat rather than the wall size.