Stretch Bars That Mark
Every Door
Where the train stops.
Ultra-wide stretched LCD displays installed above platform screen doors. Dynamic line maps, crowding indicators, and approaching train alerts. Native stretched-bar format.
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Platform Edge Stretch Bar
What it is
The bar that shows where doors stop.
A platform-edge stretch bar is an ultra-wide LCD display mounted above platform screen doors (PSD) or along the platform canopy. It shows dynamic line maps, crowding levels, next-stop information and approaching train alerts in a format that spans the full width of the door zone.
Native stretched-bar LCD panels — purpose-built for the ultra-wide aspect ratios (16:3 / 16:4.5 / 32:5) that platform deployments demand. The distinction is a manufacturing one, and it decides depth, cost and who warrants the glass.
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Native bar panels
Ultra-wide ratios from the glass up, not masked 16:9.
straighten
Door-zone sized
Matched to PSD layout and canopy headroom.
cable
Open to PIS
HDMI / LAN / serial feeds from your controller.
Panel route
Three ways to get a bar-shaped screen
Every ultra-wide display on the market took one of three routes out of the factory. They look similar on a rendering and behave very differently on a platform.
Produced ultra-wide on the panel line: sealed on all four edges by the maker, with the driver ICs and backlight laid out for that geometry. The common native resolutions we build — 1920×360, 1920×540 and 3840×600 — are only a starting list; we produce bar panels across a range of native resolutions and build to a custom stretched-bar resolution on request. Normal panel-maker warranty and supply.
A standard panel physically cut down, re-sealed and re-bonded to a new driver board. It is a real industry practice and it unlocks any dimension you like — but the new cut edge and the re-attached driver become failure points the original panel never had, and the panel maker's warranty does not follow the glass.
A whole 16:9 panel with content in a central strip and black above and below, hidden behind an apertured fascia. Cheapest to source — but you buy and power screen area nobody sees, and the enclosure keeps the full 16:9 height. Above a PSD frame that headroom usually is not there.
We build route 01. It is the only one of the three where the aspect ratio is a property of the glass rather than a compromise around it — which is what keeps a door-zone bar slim enough to clear the PSD frame. Where a project genuinely needs a dimension no native panel covers, we will say so and price route 02 honestly instead of quietly shipping it.
A practical procurement test, whoever you buy from: ask for the native resolution and the panel part number, and ask whether the panel is factory-sealed on all four edges. A letterboxed unit cannot quote a bar resolution; a cut panel cannot quote an unbroken factory seal.
图 02 — Panel routes
三种条屏来源对比 / 原生 vs 切割 vs 遮黑
Three panels side by side in section view: (1) native bar panel, factory-sealed all four edges; (2) a standard panel cut down with a visibly re-sealed edge and re-attached driver board; (3) a full 16:9 panel with a black masked strip behind an apertured bezel — the wasted area and extra enclosure height called out.
Search: stretched bar LCD panel, cut LCD panel re-sealed edge, letterboxed display bezel aperture
Three panels side by side in section view: (1) native bar panel, factory-sealed all four edges; (2) a standard panel cut down with a visibly re-sealed edge and re-attached driver board; (3) a full 16:9 panel with a black masked strip behind an apertured bezel — the wasted area and extra enclosure height called out.
Search: stretched bar LCD panel, cut LCD panel re-sealed edge, letterboxed display bezel aperture
Engineering
Built for the platform edge.
aspect_ratio
Ultra-wide native format
19"–43" native stretched-bar panels in ultra-wide ratios (16:3 / 16:4.5 / 32:5), built across a range of native resolutions and to custom resolutions on request. Factory-sealed glass — not cut down from a standard panel, not a masked 16:9.
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Door-zone alignment
Sized to match the door width and PSD layout. OEM/ODM sizing from your platform drawings.
brightness_6
High brightness for platform
500–5,000 nits with anti-glare glass. Indoor 500–1,000 / sheltered 1,500–2,500 / exposed 2,500–5,000, with ambient auto-dim.
route
Real-time line maps
Dynamic animated route maps, crowding indicators and transfer information updated via PIS controller.
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IP65 sealed
Dust-tight and water-jet resistant. Sealed against platform dust, cleaning chemicals and humidity.
architecture
Slim profile
Ultra-slim enclosure clears the PSD frame and platform canopy. Depth set per project.
The canvas
One line high, and a door zone wide.
01 — Size from the headroom down
A 16:3 canvas is only about a fifth as tall as it is wide, so there is almost no room to stack. Content has to run horizontally: one line diagram, one next-stop line, a row of door markers, a crowding strip. Anything that wants rows and columns belongs on a departure board, not here.
Which is why a bar is specified backwards from a normal screen. Start with the clear headroom above the PSD frame or under the canopy, subtract bezel and mounting hardware, and what is left is the usable display height — often little more than one primary line plus a secondary one. Diagonal is the last number you pick, not the first.
Calc: Usable Height
H_usable = H_headroom − (H_bezel + H_mount)
H_usable = H_headroom − (H_bezel + H_mount)
图 03 — Door-zone canvas
门区画布与净空 / 从净空反推显示高度
Elevation of a platform screen door with the bar above it, dimensioned: clear headroom between PSD frame top and canopy soffit, bezel and bracket allowance, and the remaining usable display height. On the screen: horizontal line diagram, next-stop line, door-position markers and a crowding strip — all on one line, no stacking.
Search: platform screen door display above, PSD stretched bar installation, metro door zone signage elevation
Elevation of a platform screen door with the bar above it, dimensioned: clear headroom between PSD frame top and canopy soffit, bezel and bracket allowance, and the remaining usable display height. On the screen: horizontal line diagram, next-stop line, door-position markers and a crowding strip — all on one line, no stacking.
Search: platform screen door display above, PSD stretched bar installation, metro door zone signage elevation
Reading distance works in your favour
The x-height arithmetic is set out on the Platform pillar page (DIN 1450). What matters here is the distance: a passenger waiting at the door stands roughly 1–3 m from the bar, not thirty metres down a concourse. Apply the same ratios at 3 m and the minimum x-height lands near 8 mm, or about 11–14 mm where reduced acuity is expected — small enough that a short bar height genuinely works, which is exactly why this format survives in a place with no headroom.
DIN 1450: d = h × 250
02 — Where our scope ends
Door positions, stopping-car markers and which side opens are decided by the signalling and PIS systems. We supply the layer that shows them: a feed arrives over HDMI, LAN or serial, and the panel renders it brightly and without lag.
We do not provide — and do not claim — any safety-related function. PSD interlocking and any door-state indication carrying a safety integrity requirement sit with the signalling supplier. If a project intends a screen to form part of a safety function, that has to be assessed at system level by the integrator; our unit is an information display, and we would rather be clear about that up front than discover it at commissioning.
Applicable industries
Used across every platform type.
Environment: Metro
Door-zone information at every stop
Metro platforms with screen doors use stretch bars to show where each car stops, which side opens, and the next station. Dynamic line maps update in real-time. High-frequency stops keep the display in constant use.
subwayDoor zones
routeLine maps
brightness_6High frequency
Metro
Metro platform screen doors
Stretch bar showing dynamic line map and next station above PSDs.
Stretch bar showing dynamic line map and next station above PSDs.
Environment: Railway
Platform edge guidance
Mainline platforms use stretch bars for train approach alerts, car numbering and platform edge safety information. Sized to match the platform canopy width.
directions_railwayApproach alerts
confirmation_numberCar numbering
architectureCanopy width
Railway
Mainline platform edge
Stretch bar showing approaching train alerts and car numbering under canopy.
Stretch bar showing approaching train alerts and car numbering under canopy.
Environment: Bus & Tram
Shelter information bars
Bus and tram shelters use stretch bars for real-time arrivals and route information. IP65 sealed against weather; wide-voltage handles shelter power variations.
directions_busReal-time arrivals
water_dropIP65 sealed
boltWide-voltage
Bus & Tram
Tram shelter information
IP65 sealed stretch bar showing real-time arrivals in a transit shelter.
IP65 sealed stretch bar showing real-time arrivals in a transit shelter.
Environment: Airport
Gate overhead displays
Airport gates use stretch bars for flight information, boarding status and gate changes. High brightness for sunlit terminal areas.
flightFlight info
event_availableBoarding status
brightness_6High brightness
Airport
Airport gate overhead
High brightness stretch bar showing flight and boarding status at gate.
High brightness stretch bar showing flight and boarding status at gate.
Specifications
Technical snapshot
Representative specification. Final values confirmed per project.
图 08 — Exploded View
硬件层剖面 / 爆炸图
Cutaway / exploded view — native stretched-bar LCD panel + optical bond + slim sealed enclosure + M12 connector + power supply.
Search: stretch bar exploded view, PSD display module
Cutaway / exploded view — native stretched-bar LCD panel + optical bond + slim sealed enclosure + M12 connector + power supply.
Search: stretch bar exploded view, PSD display module
| Visual | |
|---|---|
| Brightness | 500–5,000 nits |
| Aspect ratio | 16:3 / 16:4.5 / 32:5 (custom) |
| Native resolution | 1920×360 / 1920×540 / 3840×600 typical; custom on request |
| Physical | |
| Form factor | 19"–43" stretched bar |
| Panel construction | Native bar panel, factory-sealed |
| Ingress | IP65 |
| Mount | Overhead canopy / PSD frame |
| Interface & Power | |
| Interface | HDMI / LAN / serial |
| Compliance | CE / RoHS / FCC · ISO 9001 |
| Backlight life | up to 50,000 h (L50) |
| Warranty | 3-year standard + long-cycle after-sales |
Frequently asked
Everything you need to know about specifying stretch bars for platform screen doors.
01
Can they align with door zones?
Yes. Width, aspect ratio and mounting are sized to your platform's PSD layout through OEM/ODM. Send us the drawings and we confirm fit.
02
Are they sunlight readable on platforms?
Brightness is specified by position: 500–1,000 nits indoors, 1,500–2,500 under a sheltered canopy and 2,500–5,000 where the platform edge is genuinely exposed — all with anti-glare glass and ambient auto-dimming, which also protects the backlight and cuts night-time energy.
03
Can we keep our current PIS?
Yes. Open HDMI/LAN/serial interfaces connect to any PIS controller; no locked software.
04
What certifications apply?
CE / RoHS / FCC certified, ISO 9001 certified, with IP65.
05
How do I tell a native bar panel from a cut-down one?
Ask two questions of any supplier. First, the native resolution and panel part number — a native bar panel quotes something like 1920×360 or 3840×600, while a letterboxed unit can only quote a 16:9 resolution with a masked strip. Second, whether the glass is factory-sealed on all four edges — a cut-and-re-sealed panel is not, and the panel maker's warranty no longer follows it. Both answers should be on the datasheet, not in an email.
06
Can the bar indicate platform screen door status?
It can display door and stopping-position information that your signalling or PIS system sends it — that is ordinary content over HDMI, LAN or serial. What it is not is a safety device: we provide no safety-related function and claim no safety integrity level. PSD interlocking and any safety-rated door-state indication remain with the signalling supplier, and any intent to make a screen part of a safety function needs a system-level assessment by the integrator.
Specify stretch bars for your platform.
Share your PSD layout and door widths — we return a sized, IP65-sealed LCD proposal.