What are the common classifications of LED displays on the market?

1. It is divided into indoor, outdoor and semi outdoor according to the use environment
The indoor screen area is generally less than 1 square meter to more than 10 square meters, with high point density. It is used in non direct sunlight or lighting environment. The viewing distance is a few meters away, and the screen body does not have sealing and waterproof ability. The outdoor screen area generally ranges from a few square meters to tens or even hundreds of square meters. The point density is thin (mostly 1000-4000 points per square meter), and the luminous brightness is 3000-6000cd / square meter (different orientations and brightness requirements). It can be used under direct sunlight. The viewing distance is tens of meters away. The screen has good wind, rain and lightning protection capabilities. The semi outdoor screen is between outdoor and indoor, with high luminous brightness. It can be used outdoors without direct sunlight. The screen body is sealed, usually under the eaves or in the window.
2. According to the color, it is divided into monochrome, double primary color and triple primary color (full color)
Monochrome refers to the luminous material with only one color on the display screen, mostly single red, and yellow green can also be used on some special occasions (such as funeral home). The dual primary color screen is generally composed of red and yellow green luminescent materials. The three primary color screen is divided into full color, which is composed of red, yellow green (wavelength 570nm), blue and natural color, which is composed of red, pure green (wavelength 525nm) and blue.

3. It can be divided into synchronous and asynchronous according to the control or use mode
Synchronous mode means that the working mode of LED display screen is basically the same as that of computer monitor. It maps the computer image on the monitor point by point at the update rate of at least 30 fields / s. It usually has the ability of multi gray color display, which can achieve the effect of multimedia publicity and advertising. Asynchronous mode means that the LED display screen has the ability of storage and automatic playback. The edited text and grayscale free pictures on the PC are transmitted to the LED display screen through the serial port or other network interfaces, and then played automatically offline by the LED display screen. Generally, there is no multi grayscale display ability. It is mainly used to display text information and can be networked on multiple screens.
4. Divided by pixel density or pixel diameter
As the LED dot matrix module used for indoor screen has relatively uniform specifications, it is usually divided according to the pixel diameter of the module, mainly including: ∮ 3.0mm 60000 pixels / m2 ∮ 3.75mm 44000 pixels / m2 ∮ 5.0mm. At present, there is no very unified standard for the pixel diameter and pixel spacing of outdoor screen. There are about 1024 and 1600 pixels per m2, 2000 points, 2500 points, 4096 points and other specifications.