General technical knowledge of LED large screen

General technical knowledge of LED large screens. LED large screens have different technical indicators, which are mainly designed according to factors such as brightness, refresh, and scanning. The smaller the spacing, the wider the scanning frequency, and the larger the spacing, the smaller the scanning frequency. Usually, outdoor LED large screens To meet the brightness requirements, the power must be higher naturally. Outdoor series LED large screen waterproof is very important. Indoor LED large screens do not have high requirements for brightness, but have high requirements for consistency. Flatness is also very important for display effect. factor. The calculation method of the outdoor LED large screen: (1) Understand the specific data (length, width) of the screen. Count the number of boxes.

Number of boxes for screen length or width = pre-made screen length or width ÷ unit box length or width to calculate the actual screen size. The actual screen length or width = the (specification) length or width of the cabinet × the number of cabinets used for the screen length or width (2) Know the area of ​​the screen, there is no length and width. same room.

The calculation method of the indoor LED large screen: (1) Understand the specific data (length, width) of the screen. Count the number of cell plates used. The number of boards used for screen length or width = pre-made screen length or width ÷ the length or width of the unit board number of boards used for screen length.

Calculate the actual screen size. The actual screen length or width = the length or width of the unit board × the number of pieces used for the screen length or width. Usually, the outer frame size of the screen is based on the size of the screen plus 5-250px on each side (2) Understand the area of ​​the screen, there is no length and width. If only the area is given, the length and width need to be calculated by yourself.

It can be calculated according to the ratio of length and width 4:3 or 16:9 (generally 16:9), so that the picture effect is good. This is because the ratio of 4:3 and 16:9 can directly rebroadcast TV signals, 4:3 approximates a square LED large screen, and 16:9 approximates a rectangular LED large screen. LED large screen installation requirements: power supply requirements: power supply connection points should be within the size of the screen body 220V mains power supply, live wire and neutral ground wire; 380V mains power supply, three live wires and one neutral wire ground wire; large screens above kilowatts should be added and lowered Press to start the device.

Communication requirements: The communication distance is defined by the length of the communication line. The communication line should be installed according to the length standard of the communication line used by the model of the LED large screen installed. It is forbidden to route the communication line and the power line in the same conduit.

Installation requirements: the large screen is installed left and right horizontally, and it is not allowed to tilt backward. For hoisting, an up and down adjustment rod must be installed. Calculation method of LED large screen scanning method: Scanning method: in a certain display area, the ratio of the number of rows that are lit at the same time to the number of rows in the entire area. Indoor single and double color is generally 1/16 scan, the formula of the current number of the LED unit board is as follows: unit board current = (total number of pixels on the unit board * number of light-emitting tubes per pixel * current size of a single light-emitting tube / number of scans) single light-emitting tube current The size is usually between 0.005 and 0.02, and can usually take a value of 0.01A.

But some light-emitting tubes may need to be calculated with a current of 0.02A, or even higher, which will generate greater power consumption. Such a board has a slightly higher brightness, but it generates a lot of heat, is easy to burn out, and the lamp tube will also age rapidly, which is a very bad design. Indoor full color is generally 1/8, 1/16, 1/32 scan, outdoor single and double color is generally 1/4 scan, outdoor full color is generally static, 1/2, 1/4 scan.

At present, there are two driving methods of LED large screens on the market: static scanning and dynamic scanning. Static scanning is divided into static real pixels and static virtual, and dynamic scanning is also divided into dynamic real image and dynamic virtual. .