LED display screen Calculation method of scanning mode
Scanning mode: in a certain display area, the ratio of the number of lines lit at the same time to the number of lines in the entire area.
Indoor single and double color is generally 1/16 scan, indoor full color is generally 1/8 scan, outdoor single and double color is generally 1/4 scan, and outdoor full color is generally static scan.
At present, the driving methods of LED display screens on the market include 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. The driving device generally uses domestic HC595, Taiwan MBI5026 , Japan Toshiba TB62726, generally have 1/2 sweep, 1/4 sweep, 1/8 sweep, 1/16 sweep. For example: A common full-color module has 16*8 pixels (2R1G1B). If it is driven by MBI5026, the total module used is: 16*8*(2+1+1)=512, MBI5026 is 16 bits Chip, 512/16=32 (1) If 32 MBI5026 chips are used, it is static virtual;
(2) If 16 MBI5026 chips are used, it is a dynamic 1/2 scan virtual;
(3) If you use 8 MBI5026 chips, it is a dynamic 1/4 sweep virtual, if the two red lights on the board are connected in series;
(4) 24 MBI5026 chips are used, which are static real pixels;
(5) Using 12 MBI5026 chips, it is a dynamic 1/2 scan real pixel;
(6) Using 6 MBI5026 chips, it is a dynamic 1/4 scanning real pixel; on the LED unit board, the scanning methods are 1/16, 1/8, 1/4, 1/2, and static.
What if there is a distinction? One of the easiest ways is to count the number of LEDs on the unit board and the number of 74HC595s.
Calculation method: the number of LEDs divided by the number of 74HC595 divided by 8 = fractional scan
Real pixels correspond to virtual ones: in simple terms, a real pixel screen means that each of the three light-emitting tubes of red, green and blue that constitute the display screen will only participate in the imaging of one pixel in order to obtain sufficient brightness. . The virtual pixel uses a software algorithm to control the light-emitting tube of each color to finally participate in the imaging of multiple adjacent pixels, so that a larger resolution can be achieved with fewer lamps, and the display resolution can be increased by four times.