One.Classification of LED display screens
Indoor LED display can be used in indoor environment. This kind of display screen has moderate brightness, large Angle of view, close color mixing, light weight and high density. It is suitable for close viewing.
Outdoor LED display Outdoor LED display is used in outdoor environment, such display screen has high brightness, long color mixing distance, high protection level, strong waterproof and anti-ULTRAVIOLET ability, suitable for remote viewing.
Display Color Single-color LED display Single-color LED display consists of LED lights of one color and can only display a single color, such as red, green, orange, etc.
Dual-color LED display Dual-color LED display consists of red and green LED lights. The 256-level grayscale dual-color display can display 65,536 colors (dual-color display can display red, green and yellow).
Full color LED display Full color LED display consists of red, green and blue LED lights. It can display white balance and 16,777,216 colors.
Display function Text LED display (asynchronous screen) text LED display can display text, graphics and pictures and other information content.Networkable offline display.
Video LED display (synchroscreen) Video LED display can display all kinds of information in real time and synchronously, such as 2d or 3D animation, video recording, TV, video disc, live scene and other video information content.
Two.The basic structure of LED display screen
1. Asynchronous screen:
Generally, it is composed of display unit board (module), strip screen card, switching power supply and HUB board (optional).Connect to the computer through a serial port line, make changes to the display text, and then you can disconnect the computer to work.
Synchronous screen system is relatively complex, the system can be large or small, generally by computer, DVI graphics card, data sending card, synchronous data receiving card, HUB board, network cable, LED display screen and other components.The system always needs an online computer to work and display the images and words on the computer on the large LED screen.
Three.Noun concept involved in LED display
1. LED Pixels:
It is the smallest imaging unit of LED display.Commonly known as "dots" or "pixels".
2. LED Display module:
The smallest unit of an LED display consisting of several display pixels that are structurally independent.
· Indoor screen uses 8x8 display module, that is, each display module has 64 pixels
· The outdoor screen uses a single lamp bead, which is usually composed of 1-3 lamp beads of the same or different colors to form a pixel point of the module.
3. LED Display module:
An independent unit consisting of an LED display, as determined by the circuit and installation structure, and having display functions.To put it simply, for the convenience of assembly and display, semi-finished products from the factory are usually provided in the form of display modules, which combine multiple display modules and display drivers together.Interior screen commonly known as "unit board";Outdoor screen commonly known as "module", and then a number of modules plus chassis, fans, power supply and other structures together into a "box", mostly used for large full color screen.
· The interior screen unit board is usually 64x32(64 columns and 32 rows, consisting of 32 modules) and 64x16
(64 columns, 16 rows, composed of 16 modules), etc.The following figure shows a 64x16 unit board:
Outdoor screen modules usually have a variety of 64X32, 32x32, 32x16, 16x16 and 16x8
Above is a 16x8(2 red) outdoor screen module.Waterproof structure used in the outdoors, we can see the plastic shell, it is the most the right side of the whole structure plane graph: put on the display board is light bead, is back on display driver circuit, is this fission structure, also have a plenty of to do the display board and display driver circuit on a piece of circuit board, the overall architecture of the figure we can see the difference between the following two.The front panel and the back shell are actually a plastic cover shell. There are holes in the front panel corresponding to the position of the lamp bead to make the lamp bead leak out. There are screw holes or magnetic columns on the back shell for installation to make the module easy to assemble.The front of the module is filled with a special waterproof adhesive for display screen.