Scanning mode of LED display screen

　　With the rapid development of LED display industry, LED technology is also constantly developing, and the brightness of LED display is also constantly improving, while the size is getting smaller and smaller, which indicates that more LED displays will enter the room as a general trend. For general indoor LED display screen, the common control method adopts row and column separate control mode, which is commonly referred to as scanning mode. At present, the driving mode of LED electronic display screen includes static scanning and dynamic scanning. The static scanning is divided into static real pixel and static virtual, and the dynamic scanning is also divided into dynamic real image and dynamic virtual.

　　In the LED display screen, the ratio of the number of lines lit at the same time to the number of lines in the whole area is called scanning mode. The scanning also has several driving modes, such as 1/2 scanning, 1/4 scanning, 1/8 scanning and 1/16 scanning. It can also be said that the drive mode of the display screen is different, and the settings of the receiving card are also different. If the receiving card was originally used for 1/4 scanning evaluation, but is now used on the static screen, the display of the display screen will light up one line every four lines. Generally, the receiving card can be set. After connecting the sending card, display screen, computer and other major components, you can enter the relevant software on the computer for setting.

　　1. LED screen scanning mode

　　(1) Dynamic scanning: Dynamic scanning is a "point to column" control from the output of the driver IC to the pixel points. Dynamic scanning requires a control circuit, which costs less than static scanning. However, the display effect is poor and the brightness loss is large.

　　(2) Static scanning: Static scanning is a "point-to-point" control from the output of the driver IC to the pixel. Static scanning does not require a control circuit, and its cost is higher than dynamic scanning, but it has the advantages of good display effect, good stability, and small brightness loss.

　　2. Operating principle of LED display 1/4 scanning mode

　　The operating principle of 1/4 scanning mode of LED display screen is that each line of power V1-V4 is turned on for 1/4 of the time according to the control requirements within one frame of image. The disadvantage is that within one frame, each line of LED can only display 1/4 of the time.

　　3. Classification according to LED display screen type scanning mode

　　(1) The scanning mode of indoor full-color LED display screen: P4 and P5 are constant current 1/16, and P6 and P7.62 are constant current 1/8.

　　(2) The scanning mode of outdoor full-color LED display screen: P10 and P12 are constant current 1/2 and 1/4, and P16, P20 and P25 are static.

　　(3) The scanning mode of monochrome dual color LED display screen is mainly constant current 1/4 scan, constant current 1/8 scan, constant current 1/16 scan.

　　How to select the dot spacing of LED display?

　　Dot spacing is an important indicator of LED display. What is dot spacing? Point spacing reflects the pixel density from the distance between two pixels. Point spacing and pixel density are physical attributes of the display screen; The information capacity is the quantitative unit of the information carrying capacity displayed at one time for the pixel density of unit area.

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