An independent unit that is composed of a circuit and an installation structure and has a display function to form an LED display panel. Simply put, for easy assembly and display, the finished product is usually provided in the form of display module, and the display module and display module are added to the display module. Indoor screen commonly known as the unit plate; outdoor screen commonly known as the module, and then a number of modules coupled with the chassis, fans, power and other components together into a box, and more for large Quan Caiping.

- the interior panel unit is usually 64x32 (32 columns, 32 lines, 64 modules), 64x16 (16 column 64, 16 modules), etc..
Outdoor screen modules are usually 32x32, 64x32, 32x16, 16X16, 16x8 variety.

Large outdoor full color box which is generally composed of several modules + Case + fan + power. The color and process of manufacturing LED material is different, it can produce a different energy of the photon, which can control the wavelength of the light emitted by the LED, which is the spectrum or color. In history the first led by the use of materials is arsenic gallium (GA), the positive PN junction voltage (VF can understand light or voltage) 1.424V, a light for infrared spectroscopy.

General LED light-emitting life is very long, manufacturers generally marked as more than 1 00000 hours, actual should also pay attention to the LED brightness decay cycle, such as most for automobile taillight ur red tube light more than a dozen to a few hours after the brightness, the only original half. There is a great relationship between the intensity decay period and the material process of LED production, and the four element LED, which is usually used in the condition of economic conditions, is used to ourphp the elements of the slow fading.