LED display system Basic composition
The LED display screen is composed of several display units (unit display board or unit display box) that can be combined and spliced, plus a set of appropriate controllers (main control board or control system). Therefore, display panels (or unit boxes) of various specifications can be combined with controllers of different control technologies to form many kinds of LED displays to meet the needs of different environments and different display requirements.
Carefully decompose an LED display, which consists of the following elements (take a more complex synchronous video screen as an example):
① Metal structural frame
The indoor screen is generally made of aluminum alloy (angle aluminum or aluminum square tube) to form the inner frame, which is equipped with various circuit boards such as display boards and switching power supplies. The outer frame is made of brown aluminum alloy square tube, or aluminum alloy covered with stainless steel, or integrated with sheet metal made.
The outdoor screen frame is generally composed of angle steel or I-beam according to the screen size and load-bearing capacity, and the outer frame can be decorated with aluminum-plastic panels.
② Display unit
It is the main part of the display screen, which is composed of luminescent materials and driving circuits. The indoor screen is a unit display panel of various specifications, and the outdoor screen is a unit box.
③ Scan control panel
The function of this circuit board is data buffering, generating various scanning signals and duty cycle grayscale control signals.
④ Switching power supply
Convert 220V alternating current into various direct currents for various circuits.
⑤ Twisted pair transmission cable
The display data and various control signals generated by the main controller are transmitted to the screen through the twisted pair cable.
⑥ Main controller
Buffer the input RGB digital video signal, convert grayscale, reorganize, and generate various control signals.
⑦ Dedicated display card and multimedia card
In addition to the basic functions of a computer display card, it also outputs digital RGB signals, line, field, blanking and other signals to the main controller at the same time. In addition to the above functions, multimedia can also convert the input analog Video signal into a digital RGB signal (that is, video capture).
⑧ Computer and its peripherals
⑨ Other sources of information
TV sets, DVD/VCD players, camcorders and switching matrices, etc.