The LED display system is composed of three main 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 accurately and efficiently. Here’s a detailed breakdown of how each component functions:
The control computer serves as the central hub, receiving and processing incoming signals. It converts these signals into digital format suitable for the LED screen using a DVI card. This digital signal is then sent to the data processing unit, which distributes it across the display through differential and composite signals. The display panel ultimately transforms this digital input into vivid visual content.
The display panel itself consists of several key parts: the display module, driver circuit board, power supply, and the display unit board. The display module is made up of individual pixels, each containing light-emitting diodes (LEDs). In dual-primary-color displays, LEDs come in red (R) and green (G), allowing for 256 levels of variation in each color. This combination results in 65,536 possible color combinations per pixel, enabling rich and detailed imagery across thousands of pixels.
The driver circuit board contains large-scale integrated circuits and is connected directly to the display module. It acts as a carrier for the module and handles the transmission and driving of display data. The driver ICs used are specifically designed for LED screens and offer advanced features like constant current control and adjustable brightness, ensuring consistent and clear visuals.
The dedicated DC switching power supply provides stable and accurate voltage to the display module. It maintains a constant output voltage regardless of load changes and includes protection mechanisms against overvoltage, overcurrent, and overheating, ensuring the system runs smoothly and reliably.
The data processing section includes a sending card, a receiving card, and high-speed data cables. The sending card, located near the control computer, acts as an interface between the VGA card and the large screen. It transmits real-time video at 120 frames per second, ensuring smooth and responsive display performance.
High-speed data cables serve as reliable carriers for digital signals, minimizing interference and improving overall system stability. The receiving card processes the incoming digital signal, distributing it to the appropriate display units while also generating necessary control signals for image reproduction. It uses timing algorithms to produce grayscale and can temporarily store and scan multiple video signals onto the screen. This ensures accurate color representation, smooth motion, and stable image quality.
Both the sending and receiving cards utilize LATTICS Field Programmable Logic Arrays (FPGA) MACH4, enhancing system integration and flexibility. These components act as bridges between the control host and the display panel, ensuring seamless communication and efficient data transfer.
The control system is built around a control computer and a DVI card. The DVI card, installed in the computer, converts analog signals from the source into digital format for dynamic display on the VGA monitor. The control computer is responsible for adjusting image quality and managing video source switching. It can connect to a central network via TCP/IP, retrieving and displaying information as needed. It also allows remote control of the display’s power state through terminal and operation controllers.
A typical configuration includes a Pentium III or higher CPU, 64 MB of RAM, 8 GB of hard disk space, an optical drive, and a Windows 2000/XP operating system. However, for optimal performance, especially when handling complex visual tasks, a more powerful system is recommended.
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