Introduction to the driving method of LED display-EEWORLD

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There are two driving modes for LED display screens: static scanning and dynamic scanning. Static scanning is further divided into static real pixels and static virtual, while dynamic scanning is also divided into dynamic real images and dynamic virtual.

In a certain display area, the ratio of the number of rows lit at the same time to the number of rows in the entire area is called the scanning mode; indoor single and double colors are generally 1/16 scanning, indoor full-color LED display screens are generally 1/8 scanning, outdoor single and double colors are generally 1/4 scanning, and outdoor full-color display screens are generally static scanning. Driver ICs generally use domestic HC595, Taiwan MBI5026, and Japan Toshiba TB62726, which generally have 1/2 scanning, 1/4 scanning, 1/8 scanning, and 1/16 scanning.

For example: a commonly used full-color module has 16*8 pixels (2R1G1B). The total number of LED lights used in the module is: 16*8 (2+1+1) = 512. If it is driven by MBI5026, MBI5026 is a 16-bit 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 8 MBI5026 chips are used, it is a dynamic 1/4 scan virtual

(4) If two red lights are connected in series on the board, 24 MBI5026 chips are used, which is a static real pixel

(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 scan real pixel.

In the LED unit board, the scanning modes are 1/16, 1/8, 1/4, 1/2, and static. How to distinguish? The simplest way is to count the number of LED lights and the number of 74HC595 in the unit board. Calculation method: the number of LEDs divided by the number of 74HC595 and then divided by 8 = fractional scan.

Real pixels and virtual pixels are corresponding. Simply put, a real pixel screen means that each of the three types of red, green and blue light-emitting tubes that make up the display screen ultimately only participates in the imaging of one pixel to obtain sufficient brightness. Virtual pixels use software algorithms to control the light-emitting tubes of each color to ultimately participate in the imaging of multiple adjacent pixels, thereby achieving a higher resolution with fewer tubes, which can increase the display resolution by four times.

Keywords：LED Reference address：Introduction to the driving method of LED display

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