1. Divided from color: single color, two color, three color (full color) led display: (1) Monochrome means that the liquid crystal display has only one color of luminescent material, often single red LCD Module. (2) The two-color screen is basically made of red and green LED diodes. (3) Three-color (full-color) screen, made of red, green (wavelength 570nm), and blue; and true color, made of red, pure green (wavelength 525nm), and blue LCD Display Module. 2. Divided by environment: indoor, outdoor and semi-outdoor led LCD display: (1) The semi-open air curtain has high brightness between indoor and outdoor, and can be used outdoors for illumination. The screen is sealed, basically on the roof or window. (2) The screen area of the suffocation is basically very small (a dozen square meters), and the relative density of dots is relatively high. Under direct sunlight or environmental exposure, the observation distance is a few meters away. The body does not have the function of sealin…