LED display drive mode analysis

Time:2018-11-28 Views:139

Different applications determine 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-color and two-color scanning is generally 1/16, indoor full-color scanning is generally 1/8, outdoor single-color and two-color scanning is generally 1/4, outdoor full-color scanning is generally static.

At present, there are two driving modes of LED screen in the market: static scanning and dynamic scanning. Static scanning is divided into static real pixel and static virtual, and dynamic scanning is also divided into dynamic real image and dynamic virtual.The driving devices are generally HC595 made in China, MBI5026 made in Taiwan and TB62726 made by Toshiba of Japan. There are generally 1/2 sweep, 1/4 sweep, 1/8 sweep and 1/16 sweep.

A common full-color module pixel is 16*8 (2R1G1B). If driven by MBI5026, the module USES:

16*8*(2+1+1)=512, MBI5026 is 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 dynamic 1/2 scan virtual

(3) if 8 MBI5026 chips are used, it is a dynamic 1/4 scan virtual

(4) 24 MBI5026 chips are used, which are static real pixels

(5) 12 MBI5026 chips are used to dynamically scan the pixels by 1/2

(6) 6 MBI5026 chips are used to dynamically scan the pixels by 1/4

In LED display, scanning mode is 1/16, 1/8, 1/4 and 1/2 static.How do you tell?One of the easiest ways to do this is to count the number of leds in the panel and the number of 74HC595.

Calculation method: the number of leds divided by 74HC595 divided by 8 = 1/10 scanning

Real pixels correspond to virtual ones: to put it simply, a real pixel screen means that each of the red, green and blue light emitting tubes that make up the display screen will eventually participate in the imaging of only one pixel to obtain sufficient brightness.

Virtual pixel is to use software algorithm to control the light emitting tubes of each color and ultimately participate in the imaging of multiple adjacent pixels, so as to achieve a larger resolution with fewer light tubes and increase the display resolution by four times.