1. Project Context
The Metro Authority in a major African capital required an upgrade to its metro passenger information display system, specifically for the Driver Departure Indicator (DDI) boards. These critical LED operational displays ensure accurate communication within the passenger information system in metro operations, showing precise current time and exact train departure times to drivers.
Our LED passenger information display model WZ64x128-6.0-OSF (P6mm, H64xW128pixels) was selected for installation at key vantage points along platforms, fully integrated into the Automatic Train Supervision (ATS) infrastructure to provide synchronized, real-time departure information.
2 . Technical Challenges & Requirements
To meet the operational reliability and performance demands of a passenger information display system in metro environments, our LED passenger information display solutions are engineered to maintain high stability, safety, and seamless system integration.
Extreme Reliability Standards:
System availability: 0.9999 (no dangerous failures permitted)
Operational availability: 0.9995 (no suspension allowed)
Functional availability: 0.999 (no degradation acceptable)
Environmental Demands:
Operating temperature tolerance: 70°C ambient
IP65 LED information screen for dust and water resistance
CE compliance for electromagnetic compatibility and safety
Integration Complexity:
Interface compatibility with legacy ATS protocols
Arabic/English bilingual support with right-to-left rendering
Precision time synchronization (±100ms accuracy)
Fiber optic transmission over 2km in noisy metro environments
3. Engineering Solutions for LED Passenger Information Display Systems
Our LED passenger information display systems are engineered to meet the most demanding metro and railway environments, combining thermal optimization, reliable communication, and precise synchronization.
Thermal Management System
Adapted lens-type SMD LEDs with high brightness to reduce power consumption and overall heat generation.
High-efficiency power supplies minimize thermal output.
Dual-layer aluminum alloy enclosure with integrated heat dissipation channels and solar radiation protection.
External IP66-rated LED display fans providing positive pressure ventilation.
High-temperature components (105°C capacitors) ensure long-term reliability.
Signal Integrity & Communication
Industrial-grade TCP-to-fiber converters for long-distance transmission.
Protocol middleware ensuring seamless ATS integration in metro passenger information display systems.
Redundant communication paths with automatic failover for continuous uptime.
Precision Timing Mechanism
- Integrated Dual NTP servers with ±100ms synchronization accuracy.
Implemented hardware-level timestamp validation
Developed an automatic time correction algorithm
Display System Optimization
- Customized Arabic font library with pixel-level optimization
- Implemented dynamic content refresh with 256-level grayscale control
LED passenger displays with ≥5000 nits brightness and automatic adjustment for indoor/outdoor use.
Certification Compliance
PCB redesign with enhanced creepage distances and isolation barriers
EMCtest meeting EN 55032, EN 55035 & IEC61000; LVD test meeting IEC62638
IP65 LED information screen validated per IEC 60529 for waterproof and dustproof protection.
4. Performance Results
The LED passenger information display system in metro achieved outstanding performance during operational testing and real-world use.
Stable operation of IP65 LED information screens at 70°C ambient temperature with ±2°C thermal management.
Seamless ATS integration as part of an integrated passenger information system, ensuring zero data packet loss.
Perfect Arabic text rendering with automatic bidirectional text support.
Time synchronization accuracy within ±50ms of the ATS master clock.
Successful certification by a third-party testing laboratory for IP65 and CE Mark compliance.
The Metro Authority confirmed complete satisfaction with the LED passenger information display system’s reliability and performance, placing follow-up orders for phase two expansion projects.
