LED display scanning mode and basic working principle

With the development of LED technology, the brightness of LED electronic display has also increased, and the size is getting smaller and smaller, which indicates that more LED electronic display will become the trend of the times. However, the increase in LED brightness and pixel density has brought new and higher requirements to the control and driving of the LED screen.

As far as the general indoor screen is concerned, the general control method now adopts the rank and sub-control mode, which is commonly called the scan mode. At present, the drive mode of the LED electronic display screen has two types: static scan and dynamic scan. For static real pixels and static virtual, dynamic scanning is also divided into dynamic real image and dynamic virtual.

In the LED electronic display, the ratio of the number of lines lit at the same time to the number of lines in the entire area is called the scanning mode. The scan is also divided into 1/2 sweep, 1/4 sweep, 1/8 sweep, 1/16 sweep and other driving methods. That is to say, the display mode of the display is different, then the setting of the receiving card is also different. If the receiving card is originally used on a 1/4 scan screen and is now used on a static screen, the display on the display will be one line apart. Generally, the receiving card can be set, and the main components such as the sending card, display screen, and computer can be connected to the relevant software for setting. So here is a brief introduction to the scanning mode and principle of the LED electronic display.

First, LED electronic display scanning method

1. Dynamic scanning: Dynamic scanning is to perform “point-to-column” control from the output of the driver IC to the pixel. Dynamic scanning requires a control circuit, and the cost is lower than static scanning, but the display effect is poor, and the brightness loss is large. .

2, static scanning: static scanning is from the output of the driver IC to the pixel point to implement "point-to-point" control, static scanning does not require control circuitry, the cost is higher than dynamic scanning, but the display effect is good, stability, brightness loss Smaller and so on.

Second, LED electronic display 1/4 scan mode works

It is the time that each line of power supply V1-V4 is turned on by 1/4 according to the control requirement in one frame of image. This has the advantage of making more efficient use of the display characteristics of the LEDs and reducing hardware costs. The disadvantage is that in one frame of image, each row of LEDs can only display 1/4 of the time.

Third, according to the LED electronic display type scanning method

1. Scanning mode of indoor full-color LED electronic display: P4 and P5 are constant current 1/16, P6 and P7.62 are constant current 1/8.

2. Scanning mode of outdoor full-color LED electronic display: P10 and P12 are constant current 1/2 and 1/4, and P16, P20 and P25 are static.

3, single-and-two-color LED electronic display scanning mode is mainly constant current 1/4, constant current 1 / 8 sweep, constant current 1 / 16 sweep.