An integrator sends the same inquiry to five suppliers for a passenger information system. The quotes come back with different brightness figures, different interfaces and different warranty terms. No one can tell which offer is truly comparable, and some missing details only surface after samples arrive. Vague specifications make fair comparison impossible and often lead to change orders later. This article provides a practical checklist you can use when requesting quotes for both the 24 Inch LCD Stretched Bar Display and the 43 Inch LCD Stretched Bar Display.
Key Takeaways
Define the use case first: installation location, viewing distance, ambient light and operating hours.
Core specifications fall into five groups: display and optics, interfaces and control, mechanical and environmental, certifications and service.
Ask the manufacturer to state the exact test conditions, such as how brightness is measured and how many points are used for uniformity.
A single, consistent RFQ template is the only reliable way to make multiple quotes comparable.
Why a Clear Specification List Matters in PIS Procurement
Vague inquiries create real risk. Missing items produce quotes that cannot be compared, late design changes and unexpected extra cost. Metro projects also face strict acceptance criteria, so every specification must map cleanly to the contract and the final inspection checklist. Bar-type displays need extra detail because their dimensions and resolutions are non-standard. Two panels with the same nominal size can still differ in active area and mechanical envelope.
Display and Optical Specifications
These are the core parameters that should appear on every quote:
|
Parameter |
What to Confirm |
Typical Reference |
|
Size and active area |
Diagonal and active area in mm |
Always take the datasheet value |
|
Resolution |
Native resolution |
Common examples: 1920×360 (24"), 1920×480 (43") |
|
Brightness |
Typical value in nits and test condition |
Platform use often 700–1000 nits depending on light |
|
Contrast ratio |
Static contrast |
Typically 1000:1 to 3000:1 |
|
Viewing angle |
Horizontal / vertical |
Commonly around 178° |
|
Brightness uniformity |
Number of measurement points and minimum ratio |
Public transport often requires 80 % or higher |
|
Colour gamut / temperature |
NTSC or sRGB coverage |
Confirm according to project needs |
On platforms with natural light and glass reflections, confirm whether automatic brightness control and anti-glare treatment are available. Also ask whether the stated brightness is a full-screen average or a centre-point value. The difference can be significant.
InterfaceControl and Compatibility
Key questions to put in the RFQ
Which input interfaces are supported (HDMI, LVDS, DP, network, etc.)?
Is the panel compatible with the target media player, video-wall controller or content-management system?
Does it support EDID recognition for non-standard resolutions?
Are serial or network control available for remote power, brightness adjustment and status monitoring?
How is firmware updated, and how long is the current configuration expected to remain available?
Also confirm supply voltage, power consumption and standby power. When multiple screens share a circuit, total load and cable capacity must be checked.
Mechanical and Environmental Requirements
Structure and installation details to request:
Outline dimensions, weight, mounting-hole positions and VESA compatibility
Housing material, cooling method (passive or forced air) and required maintenance clearance
Type of front glass or panel, optical bonding and anti-reflection treatment
Operating-environment requirements should cover temperature and humidity range, continuous 24/7 operation, dust and vibration resistance (including any IP rating), burn-in test conditions and backlight lifetime definition (including the brightness-degradation criterion used).
CertificationsWarranty and Service
Compliance items depend on the target market but commonly include CE, FCC, RoHS, REACH and relevant safety marks, plus a quality-system certificate such as ISO 9001.
Warranty and support terms should state the duration and coverage, dead-pixel criteria, spare-parts lead time, response time for service, delivery schedule, MOQ and sample policy.
24-Inch vs43-InchSpec Priorities
The 24 Inch LCD Stretched Bar Display is typically used at gates and near-field wayfinding. Focus on dimensional tolerances, mounting structure and batch consistency.
The 43 Inch LCD Stretched Bar Display is more often installed on long platform corridors and in concourses. Prioritise brightness uniformity, heat management and structural strength.
Both sizes can share the same RFQ template; each simply needs a few additional project-specific line items.
Choosing a Reliable Stretched Bar LCD Manufacturer
Look for proven transit-project experience, complete and transparent specification documents, customisation capability and a solid quality-control system. A capable stretched bar LCD display manufacturer or stretched bar LCD factory can support wholesale stretched bar LCD for transit programmes and act as a custom bar LCD display supplier when special requirements arise. Teams that move from ad-hoc inquiries to a single consistent template usually see fewer late changes and smoother acceptance.
Define the use case first, then confirm specifications under the four main headings-display and optics, interfaces and control, mechanical and environmental, certifications and service-and require the manufacturer to state the exact test conditions. A uniform RFQ template makes quotes comparable and reduces the risk of later surprises. When these steps are followed, both the 24 Inch LCD Stretched Bar Display and the 43 Inch LCD Stretched Bar Display can be selected with far greater confidence that the delivered units will match the approved samples.
FAQ
Q: What specifications should I request when quoting a metro passenger information display?
A: Size, resolution, brightness and its test condition, uniformity, interfaces, environmental range, certifications and warranty terms.
Q: What brightness is suitable for a subway platform display?
A: It depends on ambient light. A common range is 700–1000 nits, preferably with automatic brightness control.
Q: Can a manufacturer customise resolution and interface for my project?
A: In most cases yes, provided size, interface and quantity requirements are clearly stated.
Q: Should I ask for a sample before the bulk order?
A: Yes. Samples allow brightness, compatibility and mechanical fit to be verified under real conditions.
Q: What documents should I request along with the quote?
A: Full specification sheet, certification documents, test reports and warranty terms.
Preparing an RFQLets Review the Specs Together
If you are preparing an inquiry for a metro passenger information system, we can review your requirements, share detailed specification sheets and arrange samples for testing
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