The LED display system is composed of three key components: the display panel, the data processing unit, and the control computer. Each part plays a crucial role in ensuring that high-quality images are displayed clearly and efficiently. Below is a detailed explanation of each component:
The control computer serves as the central hub, receiving and processing incoming signals. It converts these signals into digital format using a DVI card, making them suitable for display on the LED screen. This ensures that the visual output is accurate and consistent.
The data processing unit is responsible for transmitting the digital signal generated by the multimedia card to the display panel. This is done through both differential and composite signal transmission methods, allowing for efficient and reliable data delivery. The display panel then interprets the digital signal and converts it into a visible image, creating vibrant and dynamic visuals.
The display panel itself consists of several key parts: the display module, the driver circuit board, the power supply, and the display unit board. The display module is made up of individual pixels, each containing one or more light-emitting diodes (LEDs). In dual-primary-color displays, LEDs emit red (R) and green (G) light. By controlling the intensity of each color with 256 levels, the system can produce over 65,000 color variations per pixel. With tens of thousands of such pixels, the display can show rich, detailed, and colorful images.
The driver circuit board is built using large-scale integrated circuits and is connected to the display module via a plug-in interface. It acts as a carrier for the display module and is responsible for transmitting and driving the display data. The driver IC used in this system is specifically designed for LED displays, offering advanced features like constant current control and adjustable brightness for each light-emitting point.
The dedicated DC switching power supply provides a stable and precise operating voltage for the display module. It maintains a constant output voltage regardless of load changes and includes protection mechanisms against overvoltage, overcurrent, and overheating. This ensures the display operates reliably and without interruption.
The data processing section includes a data sending card, a data receiving card, and high-speed data cables. The sending card is installed near the control computer and acts as an interface between the VGA card and the large screen. It transmits real-time video data at a rate of 120 frames per second, ensuring smooth and continuous playback.
High-speed data cables are used to transmit digital signals, minimizing interference from high-frequency weak signals. This improves the overall stability and reliability of the system. The receiving card processes the incoming digital signal, distributes it to the appropriate display units, and generates the necessary control signals for the display panel. It also manages timing algorithms to produce accurate grayscale and stores video signals temporarily before displaying them on the screen. This ensures that colors remain true, motion is smooth, and images are stable.
Both the sending and receiving cards use LATTICS Field Programmable Logic Arrays (FPGA), specifically the MACH4 model, which enhances the system's integration and flexibility. This allows for more efficient and customizable operation.
The control system includes the control computer and the DVI card. The DVI card is installed in the computer and converts analog signals from external sources into digital format, which is then displayed on the monitor. This ensures that the visual output is sharp and clear.
The control computer is responsible for adjusting image quality and managing the switch between different video sources. It can connect to a central network system via TCP/IP, retrieving and displaying information from the network as needed. Additionally, it can send commands to turn the display on or off, controlled through terminal and operation controllers. A basic configuration includes a 586 processor or higher, 64MB of memory, 8GB hard drive, and an optical drive, running Windows 2000 or XP. However, for better performance, a Pentium III or higher CPU is recommended to handle complex display functions more efficiently.
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