Analysis of the driving mode of LED full color screen

Different applications determine the different driving modes of LED display screen. In a certain display area, 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; indoor single and double color scanning is generally 1 / 16 scanning, indoor full-color scanning is generally 1 / 8 scanning, outdoor single and double-color scanning is generally 1 / 4 scanning, outdoor full-color scanning is generally static scanning.

At present, there are two driving method of LED display screen in the market: static scanning and dynamic scanning. Static scanning can be divided into static real pixel and static virtual, and dynamic scanning can also be divided into dynamic real image and dynamic virtual image; the drivers are generally hc595 made in China, mbi5026 in Taiwan, and TB62726 in Toshiba of Japan. Generally, there are & nbsp; 1 / 2 & nbsp; scanning, 1 / 4 scanning, 1 / 8 scanning and 1 / 16 scanning.

For example: a commonly used full-color module pixel is & nbsp; 16 * 8 & nbsp; (2R1G1B); if the mbi5026 & nbsp; driver is used, the module uses:

16 * 8 * (2 + 1 + 1) = 512 & nbsp; and mbi5026 ; 16 bit chip, 512 / 16 = 32

If 32 mbi5026 chips are used, it is static virtual

If 16 mbi5026 chips are used, it is dynamic 1 / 2 scan virtual

(3) if 8 mbi5026 chips are used, it is a dynamic 1 / 4 scan virtual LED display screen

If two red lights on the board are connected in series

(4) with 24 mbi5026 chips, it is a static real pixel

(5) with 12 mbi5026 chips, it is a dynamic 1 / 2 scan real pixel

With 6 mbi5026 chips, it is a dynamic quarter scan real pixel

In the LED display screen, the scanning modes are 1 / 16, 1 / 8, 1 / 4 and 1 / 2 static. How to distinguish? One of the simplest ways is to count the number of LEDs in the unit board and the number of 74HC595.

How to calculate: the number of LEDs divided by the number of 74HC595 and then divided by 8 = a fraction of the scan

Real pixel and virtual pixel are corresponding: in simple words, real pixel screen refers to the red, green and blue light emitting tubes that constitute the display screen, and each of them only participates in the imaging of one pixel in order to obtain enough brightness.

The virtual pixel uses software algorithm to control the light emitting tube of each color, and finally participates in the imaging of multiple adjacent pixels, so that the larger resolution can be achieved with fewer lamps and the display resolution can be increased by four times. [large electronic display screen]

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