A corner site looks like a gift when you first walk it. Two streets, two traffic flows, twice the eyeballs. Then the quote comes back roughly 30% above the flat wall next door, and everyone in the meeting wants to know why glass on a corner is so much more expensive than glass on a straight facade.
It isn't the glass. Here is where the money actually goes.
The premium is steel, not pixels
For a fixed outdoor wall the cabinet is the cheap part. An 8 mm cabinet in the AS8 range is 960 × 960 × 140 mm with a 120 × 120 pixel grid — 14,400 pixels — at over 5,000 nits, IP65, rear service. The AS8 product page puts the cabinet count for a 4 × 3 m wall at 5 × 4 = 20 cabinets, giving 4.80 × 3.84 m of active area.
Now put two of those walls on a 90° corner. Naively that is 40 cabinets. It never is. The corner has to be resolved, and there are only three ways to resolve it:
- Mitre with a blank corner column. The two faces stop short of the edge and a dead column covers the gap. Cheapest steel, cheapest cabinet count, and you lose 300–600 mm of screen width on each face at exactly the point pedestrians look at.
- Segmented chamfer. Three or four narrow angled segments carry the picture around the corner. Best result on camera, and the most expensive steel on the job — every segment has its own frame, its own angle, its own tolerance stack.
- No wrap at all. Two faces meet at 90° and the corner stays dark. Sometimes the right answer, and rarely the one anybody proposes first.
The chamfer usually adds 8–12% to the cabinet count and something closer to double, per linear metre, on the steel. That is the 30%. It was never LED cost.
Access is the line item everyone forgets
The AS8 is rear service, and the datasheet is honest about it: plan roughly 600 mm of clear walkway behind the cabinet for module and power-supply swaps.
A building corner is where the structure lives. Column, stair core, riser, sometimes the lift shaft. That 600 mm walkway is frequently impossible on at least one of the two faces, and you find out after the steel is drawn. If it is impossible, you ask for a front-service frame at quotation stage — not after installation, when the only remedy is dismantling the face.
Budget the access constraint before you budget the screen. On corner jobs it is the single most common cause of a redesign.
Two faces means two thermal histories
Here is the one that shows up two years later, as a complaint rather than a cost.
One face gets morning sun, the other gets afternoon sun. Same cabinet, same pitch, same bin — different thermal load, different duty cycle, different rate of LED aging. Over 18 to 24 months the two faces drift apart in colour temperature, and the drift is most visible exactly where they meet: the corner seam.
Three ways to defend against it, in ascending order of cost:
- Specify the same LED bin and the same brightness grade across both faces, in writing, on the purchase order. Mixed bins are the usual root cause.
- Commission a per-face brightness calibration, not one calibration for the whole install. It costs an afternoon and buys you two years.
- Run a per-face dimming schedule off the ambient sensor, so the sunlit face is not driven at full output through its hottest hours.
None of these are expensive. All of them require that somebody thought about the corner as two screens rather than one.
Content has to be authored for the seam
A standard 16:9 feed does not map onto a wrapped corner. Neither does a 32:9 crop, because the chamfer segments are narrow and the geometry is not planar.
What actually works:
- Author the creative with a dead band through the corner, or a graphic element that deliberately crosses it (a ribbon, a light trail, a moving object) so the seam reads as intentional.
- Give the processor a custom resolution matching the true active area, and let it letterbox rather than stretch.
- Keep text off the chamfer. At eight millimetres pitch the corner segments are the worst-case viewing angle on the whole wall, and geometry compresses the glyphs.
If the client's agency insists on delivering a single flat video, the corner will look like a mistake every time the content changes.
The decision, in numbers
Rough shape of the trade, for two 4 × 3 m faces on a 90° corner:
| Option | Cabinets | Steel | Seam | Best for |
|---|---|---|---|---|
| Single face only | 20 | Standard | None | One approach, budget-capped sites |
| Corner wrap, mitred | ~40 | Corner column | Dark band | Sites where the corner is not the hero |
| Corner wrap, chamfered | 44–46 | Custom, ~2× per m | Continuous | Landmark corners, camera-facing |
Add the front-service frame if the rear walkway cannot be found, and add the per-face calibration regardless.
The question I would put to the client is not "can we afford the corner". It is whether the second approach is worth roughly a third more on the whole install. On a junction where two arterial roads meet, it usually is. On a corner where one street is a service lane, it usually is not — and a single face at eye level will outperform a wrapped corner that nobody stops in front of.
Corner wrap at 30% more, or a single face at eye level — which would you pay for?
I work with MuenLED, a Shenzhen LED manufacturer. The AS8 figures above come from the published specification; the corner cost structure comes from quoting these jobs.
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