Analyze the scanning mode and principle of LED display screen
329 views admin 2018-05-31
Along with the development of LED technology, the brightness of LED electronic display screen is also increasing, and the size is getting smaller and smaller, which indicates that more LED electronic display screen will become the trend of indoor environment.
However, the improvement of LED brightness and pixel density also brings new and higher requirements for the control and drive of LED screen.In terms of general indoor screen, now general control method adopts control mode, known as scanning mode, for the moment the LED electronic display driver mode has two kinds of static scan and dynamic scan, static scan is divided into static compaction pixels and static virtual, dynamic scanning is also divided into dynamic realities and dynamic virtual;
In the LED electronic display screen, the number of rows lit at the same time is proportional to the number of rows in the whole area, which is called scanning mode.The scanning is also divided into 1/2 scanning, 1/4 scanning, 1/8 scanning, 1/16 scanning and other driving modes.That is to say, the drive mode of the display screen is different, so is the setting of the receiving card.If the receiving card was originally used on the 1/4 scan screen and is now used on the static screen, the display will be on a line every 4 lines.Generally, the receiving card can be set up. When the main devices such as sending card, display screen and computer are connected, relevant software can be entered into the computer for setting.So let's first introduce the scanning mode and principle of LED electronic display screen.
LED electronic display screen scanning method:
1, dynamic scanning: dynamic scanning from the output of the driver IC to the practice of "point to the column" between pixel, the control of dynamic scanning need control circuit, the cost is lower than static scan, but the display effect is poorer, brightness loss is bigger.
2, static scan: static scan from the output of the driver IC to the practice of "point to point" between pixel, the control of static scan don't need to control circuit, the cost higher than the dynamic scan, but the display effect is good, good stability and the advantages of less brightness loss and so on.
Working principle of 1/4 scanning mode of LED electronic display:
It is the time for each line of power v1-v4 in 1 frame of image to turn on 1/4 of each line according to the control requirements.The advantage of this approach is that the display features of the leadership can be more effectively utilized and the hardware cost can be reduced.The drawback is that each line leader can only display 1/4 of the time in a frame.
According to the scanning mode of the leading electronic display screen:
1. Scanning method of indoor full-color LED electronic display :P4,P5 is 1/16 of constant current,P6 and P7.62 are 1/8 of constant current.
2. Scanning mode of outdoor full-color LED electronic display :P10,P12 is constant current 1/2, 1/4,P16,P20 and P25 are static.
3. The scanning mode of single-color and two-color LED electronic display is mainly 1/4 constant current, 1/8 constant current sweep and 1/16 constant current sweep.