Most rental enquiries start with pixel pitch. On a curved stage wall, pitch is the last thing that decides whether the job goes well. The curve decides the cabinet count, the rigging plan, the seam layout and — only after all of that — whether the audience sees a wall or a polygon.
Here is the order I would work in, as someone who quotes these walls from the factory side.
1. Fix the geometry before you count cabinets
A curved wall is defined by three numbers: the straight-line width you need, the radius of the arc, and how much angle each seam can take.
For cabinets of width w joined at an angle θ per seam, the resulting radius is:
R = w / (2 · sin(θ / 2))
Take a 500 mm cabinet. At 5° per seam the radius comes out around 5.7 m. At 2.5° per seam it doubles to roughly 11.5 m. So halving the seam angle doubles the radius for the same cabinet — and that single number is what turns a "small curve" into "we need twice the floor space".
Practical consequence: ask what angle inserts actually exist. Rental cabinets usually ship with 0°, 2.5°, 5° and sometimes 10° options. If the answer is "we can do any angle", the answer is wrong — the cabinet has fixed mechanical positions, and the arc is built by choosing one of them.
2. A curve made by bending a flat frame is not a curve
There are two ways to get a curved wall, and only one of them is repeatable.
The correct way is an angle lock or an angled connecting insert between cabinets: the cabinet keeps its own geometry, the seam takes the angle, and the panel face stays flat across its own width.
The other way is to force a flat cabinet against a curved truss or pull the frame with ratchet straps. It sort of works for one night. Then you get: visible gaps at the outer seams, modules pushed out of plane, rows of pixels that no longer line up across a seam, and a cabinet frame that has been pre-stressed for the rest of its rental life.
On a 3.91 mm wall the seam tolerance is the thing the audience notices, not the radius. Attendees standing 3 m from the stage see a 1 mm step at eye level.
3. Three load numbers to have before the first truck rolls
A curved wall is heavier and less forgiving than the flat wall of the same area, because the arc pushes the ends outward and the truss has to hold that load line, not just vertical weight.
Before quoting a rig, get:
- Total flown weight — cabinets, rigging hardware, cable, and anything hung on the wall.
- Pickup point count and rating — how many motors or clamps, and what each one is rated for. Then apply your local safety factor, and do not treat the rating as the working load.
- Whether the venue allows flown or only ground support. Many halls will not allow anything hung from their roof, and the answer changes the whole plan: ground support means ballast, base plates and floor loading per square metre, not motors.
The ground-support structure is not a downgrade if it is designed for the wall — it is a different product. What matters is that the ladder truss spacing matches the cabinet column spacing, so the wall is supported where the cabinets actually join, not between them.
4. The content has to know it is on a cylinder
A curved wall showing flat 16:9 content looks wrong at the edges: faces stretch, logos squash, and text on the outer cabinets runs faster than the middle. The media server or the processor has to map the surface as a cylinder before it plays.
Ask who is doing that mapping, and whether it is included. On a 5 m radius wall with eight cabinets, a flat render is the most common reason a technically perfect build still looks cheap on camera.
5. What to put in the RFQ
- Required radius and the straight-line width you are trying to hit
- Number of seams and the angle per seam you expect
- Cabinet dimensions and whether the same cabinet is used for flat and curved sections
- Rigging method: flown, ground support, or both, with the venue's height limit
- Floor loading limit of the venue
- Who handles content mapping
- Spare cabinet count, because on a curve a dead cabinet in the middle of an arc is not a simple swap
None of this is exotic. It is the same list every experienced production manager works from. The trouble starts when the wall is ordered as "a 3.91 screen, 5 by 2 metres, curved please" and the curve is treated as a finishing detail instead of the input that sets everything else.
If you want to see how the cabinets and the angle locks are actually built, the rental series we make is here: ARC3.91 indoor stage rental panel.
MuenLED
I work with MuenLED, a Shenzhen LED display manufacturer. This post is about how these walls are specified, not a pitch — the same checklist applies to any rental cabinet on the market.
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