Understanding LED Display Receiving Cards | Working Principle, Function, and Structural Types

Overview of Receiving Card Functions and Working Principles

The receiving card is a core component of the LED display control system and is often referred to as the "central nervous system" of the display. Below is a professional analysis of the receiving card's functional positioning, working principles, and structural classification, suitable for technical documentation, training materials, or product manuals.

LED Display Control Card

1. Functional Positioning of the Receiving Card

The receiving card plays a vital role in the LED display system, with its main functions including:

• Data Reception: Receiving audio and video data transmitted from the sending card via the network interface.

• Signal Processing: Decoding, reassembling, and reformatting the received signals to meet the display requirements of LED modules.

• Driving Signal Output: Outputting control signals based on the driver chips and circuit design of the LED modules to drive the modules for image and video display.

• Accurate Content Reproduction: Ensuring precise and stable reproduction of the display content, supporting high refresh rates and grayscale levels to deliver superior visual effects.

The precise control and stable signal output of the receiving card are critical for achieving high-quality visuals and reliable performance in LED displays.

Novastar Armor A4S LED Screen Receiving

2. Working Principles of the Receiving Card

The working mechanism of the receiving card can be divided into three stages:

1. Initialization Stage

• Power-Up:

  When the receiving card powers on, the built-in MCU (microcontroller unit) controller sends instructions to the Flash memory chip.

• Program Loading:

  The Flash chip loads the program into the FPGA (Field Programmable Gate Array) chip, enabling the receiving card to enter its operational state.

2. Signal Reception and Decoding

• Signal Reception:

  The receiving card receives audio and video signals from the sending card via the network interface.

• Preliminary Processing:

  
  

  The network transceiver amplifies and preliminarily processes the received signals.

• Signal Decoding:

  
  

  The amplified signals are sent to the FPGA chip for decoding, reorganization, and data conversion to meet the display requirements of the LED modules.

3. Driving Signal Output

• Signal Transmission:

  The decoded data is transmitted through the output interface of the receiving card.

• Physical Connection:

  Depending on the interface type of the LED modules, users can configure HUB adapter boards or directly connect the receiving card to the modules.

• Content Display:

  The driving signals control the LED modules to display images and videos, completing the real-time content update process.

Through these steps, the receiving card manages the entire process from signal reception to display content output.

3. Structural Types of Receiving Cards

Based on the connection interface type, receiving cards can be categorized into the following two types:

1. 50Pin Interface Receiving Card

• Features:

  
  

  Requires an external HUB adapter board to connect the receiving card to the LED modules.

• Advantages:

  • Highly adaptable and compatible with various LED board layouts and interface designs.

  • Offers greater flexibility, suitable for customized designs in non-standard module applications.

• Applications:

  
  

  Commonly used in LED display projects requiring custom configurations.

2. Integrated HUB Receiving Card

• Features:

  The receiving card integrates the HUB board functionality, allowing direct connection to the LED modules without the need for additional adapter boards.

• Advantages:

  • Simplifies system connections and wiring, making installation more convenient.

  • Enhances system standardization, suitable for mass production and easier maintenance.

• Applications:

  Often used in standardized LED module applications for large-scale production.

Both structural types have their respective advantages and can be selected based on the specific project requirements.

Importance of Receiving Cards and Selection Recommendations

1. Importance of Receiving Cards

Receiving cards directly impact the display quality and operational stability of LED displays. Their performance determines the clarity, color reproduction, and reliability of the system. A high-quality receiving card can meet the following demands:

• Support high refresh rates and high grayscale levels for superior display effects.

• Enable precise brightness and chromaticity calibration at the pixel level.

• Provide advanced features such as 3D display, pre-stored images, and network monitoring.

2. Recommendations for Selecting Receiving Cards

When choosing a receiving card, consider the following factors:

• Project Requirements: Select a card that matches the size, resolution, and application scenario of the LED display.

• Interface Compatibility: Ensure the receiving card supports the interface type and signal processing requirements of the LED modules.

• Feature Scalability: Choose a card that supports future upgrades (e.g., 3D display, intelligent monitoring) to enhance the system's long-term value.

• Environmental Adaptability: For outdoor or harsh environments, opt for receiving cards with excellent protective features, such as waterproof, moisture-proof, and dust-proof designs.

The receiving card is the core component of the LED display control system, with a clear functional positioning and working principle. By selecting the appropriate type and model of receiving card, LED displays can achieve high-quality visuals and meet the functional and stability requirements of various applications.