LED Sending Cards | Working Principle, Function, and Structural Types
- Tse Cherie
- Apr 1
- 4 min read
Updated: Apr 3
Overview of Sending Card Functions and Working Principles
The sending card is a core component of the LED display control system and is often regarded as the signal bridge of the display. It is responsible for converting video signals from front-end devices into data that LED screens can recognize and display.
Below is a professional overview of the sending card’s functional positioning, working principles, and structural classification, suitable for technical documentation, product manuals, and training materials.
1. Functional Positioning of the Sending Card
The sending card plays a vital role in the LED display system, with its main functions including:
Data Input
Receiving video signals from computers, video processors, or media servers via HDMI, DVI, or other interfaces
Signal Processing
Decoding, scaling, and converting video signals into formats compatible with LED display systems
Data Transmission
Sending processed data to receiving cards through Gigabit Ethernet ports
Display Synchronization
Ensuring stable and real-time synchronization between video sources and LED displays
2. Product Classification of Sending Cards
Each Gigabit Ethernet port supports approximately 650,000 pixels
Basic Sending Card 2 Ports
Supports up to 1.3 million pixels, suitable for small LED displays
Advanced Sending Card 4 Ports
Supports up to 2.3 million pixels, ideal for medium-sized displays
4K or High-End Sending Card 16 Ports
Supports up to 8.3 million pixels, designed for large-scale or ultra-HD LED screens
3. Working Principle of the Sending Card
The sending card operates through the following process:
Signal Input
Video signals are received through HDMI, DVI, or DisplayPort interfaces
FPGA Processing
The FPGA chip performs decoding, color processing such as RGB and YUV conversion, and scaling
Data Buffering
Processed data is temporarily stored in memory to ensure stable output
Signal Output
Data is packaged and transmitted via Gigabit Ethernet ports to receiving cards
Supported Color Formats include RGB444, YUV444, and YUV420
Gamma Correction
When input signals use 10-bit or 12-bit depth, Gamma correction converts them to 16-bit depth to improve grayscale performance and image smoothness
4. Applications of Sending Cards
Stadium and arena LED displays
Stage background video walls
Outdoor advertising billboards
Shopping mall LED screens
Broadcast control rooms
Traffic management systems
Corporate conference displays
5. Advantages of Sending Cards
Stable Transmission with FPGA
The built-in FPGA enables high-speed data processing and real-time signal transmission, ensuring smooth playback without latency for live events and dynamic content
High Compatibility with Multiple Systems
Supports HDMI, DVI, DisplayPort and works with various LED modules, receiving cards, and configurations for flexible integration
Support for 4K and Large-Scale Displays
Capable of driving ultra-high-definition resolutions such as 3840×2160, suitable for large video walls and high-end applications
Advanced Color Processing and Gamma Correction
Supports multiple color formats and enhances grayscale performance, delivering smoother gradients and accurate color reproduction
Remote Configuration and Monitoring Capabilities
Allows real-time system monitoring, brightness adjustment, and remote troubleshooting through software platforms
Flexible System Expansion
Supports system scaling by adding more ports or controllers to meet growing project requirements
High Reliability for Continuous Operation
Maintains stable performance during long-term operation, suitable for mission-critical environments
6. Limitations of Sending Cards
Port-Based Pixel Load Limitation
Each port supports a limited number of pixels, requiring multiple ports or controllers for large displays
Requires Professional Configuration
Setup involves resolution configuration, mapping, and system integration, which requires technical expertise
Not Plug-and-Play Equipment
Must be properly installed and configured within a complete LED control system before use
Limited Scalability in Entry-Level Models
Basic models may not support future expansion or higher resolution upgrades
Dependency on Brand Ecosystem
Some devices only work within specific brand systems, limiting compatibility
Environmental and Installation Constraints
Long-distance transmission and outdoor use require proper cabling and protective design
Higher System Integration Complexity
Large systems with multiple controllers require careful planning and management
Importance of Sending Cards and Selection Recommendations
1. Importance of Sending Cards
Sending cards directly impact the signal quality, synchronization, and overall performance of LED displays. A high-quality sending card can support high-resolution output, ensure accurate color reproduction, maintain stable operation, and enable advanced system features.
2. Recommendations for Selecting Sending Cards
Project Requirements
Select based on screen size, resolution, and application scenario
Load Capacity
Ensure the controller supports the total pixel count
Interface Compatibility
Confirm compatibility with HDMI, DVI, or other input formats
System Compatibility
Ensure proper matching with receiving cards and control systems
Scalability
Choose models that support future upgrades
Environmental Adaptability
Select suitable designs for indoor or outdoor environments
The sending card is the core bridge of the LED display control system, with clear functional positioning and working principles. By selecting the appropriate model and configuration, users can achieve stable performance, high-quality visuals, and efficient operation across various applications.
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