LED screen, in simple terms, is composed of a number of display modules can be combined splicing. These different modules with the appropriate control system is a complete display.  Many specifications of the display board can be matched with different control technologies and controllers, thus forming many different LED displays to meet different environmental requirements. 

The main components of LED display
1. External framework. This is a basic structural frame used to secure the internal frame and carry hardware components such as power supplies such as unit boards, circuit boards and switches.
2. Display module. That is, the main part of the LED screen. It is generally composed of a driving circuit and LED lights. In the form of expression, if it is used for indoor LED screen, is a unit display board; The OUTDOOR LED screen is usually in the form of a module box.
3. Scan the control board. This is also a circuit board, the main function is used for data buffer, operation can generate a variety of scanning signals and duty cycle gray control signals, used for signals and data transmission between modules.
4. Master controller. Operation can generate a variety of control signals, the digital video signal buffer or reorganization, so that the LED screen works normally.
5. Transmission cable. The data and various other signals generated by the master device can be transmitted to a screen.
Display card and multimedia card. In addition to the function of the graphics card, the DISPLAY card LED screen can also output digital signals, hidden signals, and the transmission of these signals to the master. In addition, the multimedia card can also change some input signals into digital signals for video acquisition.
Two, the main working principle of the display screen
The display screen is generally composed of a scanning board, a master controller, a display control unit and a display body. During screen operation, the master controller will obtain pixel and various brightness data from the computer graphics card and distribute them to the scanning board of each display module. At this time, the scanning board is responsible for connecting and transmitting these data and transferring them to the display control unit. For the master controller, its main work is to convert the graphics card signal into LED display required signal format and data. Shift register with gray level control function, is generally used for image display screen and control single operation display.
Scanning plate is, so to speak, which forms a connecting link between the preceding and the effect of it on the one hand is to accept the main controller of video signal, on the other hand is the need to belong to the same level of original data transfer out, give yourself the display module control unit, at the same time it also need to put some of this does not belong to the corresponding data transmission scanning board of the next level. That is to say, in fact, no matter the video signal, or LED display data, its differences in time, space and order and other aspects, need to be coordinated through the scanning board.