The LED display system consists of three major components: the display body, data processing and control computer. The schematic diagram of each part is as follows:
The control computer is responsible for receiving and processing incoming signals and converting the signals to digital signals suitable for the LED screen through the DVI card. The data processing part is to send the digital signal generated by the multimedia card to the LED screen body through differential and composite. The display body expresses the digital signal as a graphic image. Display body
The display body is mainly composed of a display module, a display driving circuit board, a power supply and a display unit board. The display module is a display unit composed of pixels. A light-emitting diode (abbreviated as "LED") is implanted in the pixel. The LEDs of the dual primary color display have two primary colors: red (R) and green (G). By controlling to have 256 variations in both primary colors, 65,536 color tones can be obtained per pixel. The entire display, made up of tens of thousands of pixels, delivers richly colored images.
The display driver circuit board is composed of a large-scale integrated circuit and a circuit board. It is connected to the display module by plugging, and serves as a carrier of the display module, and is responsible for transmission and driving of display data. The driver IC adopts a driver chip dedicated to the LED display screen, and has advanced control functions such as constant current and adjustable brightness of each light-emitting point.
The dedicated DC switching power supply for the display provides a constant, accurate operating voltage for the display module. The switching power supply has a constant voltage characteristic, the output voltage does not change with the change of the load, and has the protection functions of overvoltage, overcurrent, overheating, etc., which is the basic guarantee for the normal and stable operation of the display system.
data processing
The data processing section is composed of a data transmitting card, a data receiving card, and a high speed data cable.
The data sending card is installed next to the control computer and is an interface card between the VGA display card and the large screen. Through the card, the data on the VGA display is transmitted to the large screen in real time at a rate of 120 frames per second.
As a transmission carrier of digital signals, high-speed data transmission cables eliminate interference caused by high-frequency weak signal transmission and increase the stability and reliability of the system.
The data receiving card receives the digital signal from the sending card, automatically distributes the received information to each display unit of the large screen, and provides various control signals required for the display to the display screen body, so that the display screen body can be Reproduce a rich and dynamic picture. Timing is controlled by different algorithms to produce grayscale. At the same time, a large number of video signals can be temporarily stored and scanned to the screen. The data receiving card ensures the authenticity of the display color, the smoothness of the motion and the stability of the image. Its component distribution diagram is as follows:
The data sending card and the receiving card are bridges connecting the control host and the display body. The LATTICS Field Programmable Logic Array (FPGA) MACH4 is adopted on the card, which greatly improves the integration and flexibility of the system.
Control System
The control system consists of a control computer and a DVI card. The DVI card is installed in the computer to convert the analog signal of the signal source into a digital signal and dynamically display it on the VGA monitor.
DVI card structure block diagram
The function of the control computer is mainly responsible for adjusting the picture quality and controlling the switching of various video sources. The controller can be connected to the central network system according to the TCP/IP protocol, and is responsible for periodically taking out the information to be displayed from the network, and can correlate as needed. The information is displayed on the big screen. In addition, the central controller can issue a power command to turn the display on and off, and execute it separately through the terminal controller and the operation controller. The basic configuration is 586 or more, 64 megabytes of memory, 8G hard disk, optical drive, Windows2000/XP operating system. However, it is best to use a Pentium III or higher CPU to better and faster display various display functions.
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