The basic structure of LED display

　　Simply speaking, LED display screen is composed of a number of display units that can be combined together (unit display board or unit display box) to form the screen body, coupled with a set of appropriate controller (master control board or control system). So a variety of specifications of the display board (or unit box) with different control technology of the controller can be composed of many kinds of LED display, to meet the needs of different environments, different display requirements. Carefully break down an LED display, which consists of the following elements (take a more complex synchronous video screen for example):

　　① Metal structure frame

　　The indoor screen is generally made of aluminum alloy (Angle aluminum or aluminum square tube) to form the inner frame, equipped with display board and other circuit boards and switching power supply, the outer frame is made of brown aluminum alloy square tube, or aluminum alloy covered with stainless steel, or sheet metal integration.

　　The outdoor screen frame is usually made of Angle steel or I-beam steel according to the size of the screen body and its bearing capacity. The outer frame can be decorated with aluminum plastic plate.

　　② Display unit

　　Is the main part of the display, composed of luminescent materials and driving circuit. Indoor screen is a variety of specifications of the unit display board, outdoor screen is the unit box.

　　③ Scan the control panel

　　The function of the circuit board is data buffering, generating various scanning signals and duty cycle gray control signals.

　　Switching power supply

　　The 220V alternating current into a variety of DC to provide a variety of circuits.

　　⑤ Twisted pair transmission cable

　　The display data and various control signals generated by the master controller are transmitted to the screen body through twisted pair cables.

　　⑥ Main controller

　　The input RGB digital video signal is buffered, gray transformed, reorganized, and generated various control signals.

　　⑦ special display card and multimedia card

　　Besides the basic function of computer display card, it also outputs digital RGB signal and line, field, blanking signal to the master controller. In addition to the above functions, multimedia can also change the input analog Video signal into digital RGB signal (that is, video acquisition).

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