LED Displays: Classification, Structure and Drive
The biggest feature of the LED display is that its manufacture is not limited by the area, and can reach more than tens or even hundreds of square meters. It is used in various indoor/outdoor public places to display text, graphics, images, animations, video images and other information. It has strong advertising rendering power and shocking power. Its high brightness, full color, convenient and fast error detection and free adjustment of LED brightness are the development trend of the market.
Classification of LED display
LED screens are divided into indoor LED screens and outdoor LED screens according to the use environment; LED screens are divided into single-primary LED screens, dual-primary LED screens and full-color LED screens according to display color; , 64, 128, 256 grayscale LED screens, etc.; LED screens are divided into text LED screens, graphic LED screens, synchronous video LED screens, and TV video LED screens according to display performance.
System composition of LED display
Display unit: This is the main part of the LED display screen, which is composed of luminescent materials and driving circuits. The indoor screen is the unit display board of various specifications, and the outdoor screen is the unit box.
Main controller: The function is to buffer, transform and reorganize the input RGB digital video signal, and generate various control signals.
Switching power supply: The purpose is to convert 220V alternating current into various direct currents to provide various circuits.
Transmission cable: The display data and various control signals generated by the main controller are transmitted to the screen body by twisted pair cables.
Scanning controller: The function of this circuit board is data buffering, generating various scanning signals and duty cycle grayscale control signals.
Special display card and multimedia card (video card): In addition to the basic functions of a computer display card, the special display card for LED full-color screen also outputs digital RGB signals and line, field, blanking and other signals to the main controller. In addition to the above functions, the multimedia card can also convert the input analog Video signal into a digital RGB signal (ie, video capture).
Other signal sources and their external devices: including computers, TV sets, Blu-ray, DVD, VCD, camcorders, etc.