1. According to the primary color, it can be divided into monochrome display: monochrome (red or green). Double primary color display: red and green double primary colors, 256 gray levels, which can display 65,536 colors. Full-color display screen: Red, green and blue. A full-color display screen with 256 gray levels can display more than16 million colors.

2.LED digital display screens are classified according to display devices: the display devices are 7-segment digital tubes, which are suitable for making electronic display screens such as clock screens and interest rate screens. To display numbers. LED dot matrix graphic display screen: The display device is a dot matrix display module composed of many evenly arranged light emitting diodes, which is suitable for playing text and image information. LED video display screen: The display device consists of many light-emitting diodes, which can display various video files such as videos and animations.

3. Indoor display screens are classified according to the use occasions: the luminous point is relatively small, generally φ 3 mm-φ 8 mm, and the display area is generally several to ten square meters. Outdoor display screen: the area is generally tens of square meters to hundreds of square meters, with high brightness, which can work in the sun and has the functions of wind, rain and water prevention.

4. According to the diameter and spacing of luminous points, the indoor screen (according to the diameter) is 3mm, φ3.7φ5mm and φ 5mm, and the outdoor screen (according to the spacing) is PH 10, PH 12, PH 14 and PH 16. ......

5. Display modes include static, horizontal scrolling, vertical scrolling and page turning display. Single module control drives 12 (maximum 24) 8×8 lattice, * *16× 48 lattice (or 32×48 lattice), that is, a single MAX72 19 (or PS72 19, HD7279). "Cascading" can form a large display screen with any lattice. Good display effect, low power consumption and lower cost than using MAX72 19 circuit.

Simple difference: outdoor is to pour a layer of glue on the semi-outdoor to prevent water; Semi-outdoor and indoor products are not waterproof. Generally, outdoor brightness is much higher than indoor brightness!