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First of all, from the color to points: monochrome, dual-color, three-color (full color) led display:
There are too many kinds of led displays, how to categorize them?
1, monochrome refers to the display only one color of light emitting material, mostly single red.

2, two-color screen is generally composed of red and green led diodes.

3, three-color (full color) screen, composed of red, green (wavelength 570nm), blue; and true color, composed of red, pure green (wavelength 525nm), blue.
There are too many kinds of led displays, how to categorize them?
Secondly, according to the environment: indoor, outdoor and semi-outdoor led display:

1, semi-open air screen between indoor and outdoor, high brightness, can be used outdoors in the sun, the screen is sealed, generally on the roof or window.

2, indoor screen area are generally very small (more than ten square meters), high point density, in direct sunlight or ambient lighting, viewing distance in a few meters away, because it is indoor, so do not use the open air, the screen body can not have a sealed waterproof function. Indoor display dot matrix module-based, because the display brightness requirements for indoor use are not high; LED Screen

3, outdoor display area of small tens of square meters, large hundreds of square meters or even thousands of square meters have, point density is sparse (mostly 1000-4000 points per square meter), luminous brightness in 3000-6000cd / square meter (facing different, different brightness requirements), in direct sunlight conditions, viewing distance of dozens of meters because It is outdoor, so must use waterproof box, in the screen has a good resistance to wind, rain and lightning protection.

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