According to the display principle of CRT display, a single pixel constitutes a horizontal scanning line, and the horizontal scanning lines are vertically accumulated to form a complete picture.

The refresh rate of the display is controlled by the graphic DAC, which will generate a vertical synchronization signal after scanning a frame. We usually say that turning on vertical synchronization refers to sending signals to the 3D graphics processing part of the graphics card, so that the graphics card is limited by vertical synchronization signals when generating 3D graphics.

Opening effect

For example, live and FPS games can prevent the tearing phenomenon when the game screen moves at high speed after opening. Of course, if the FPS of your game screen can reach or exceed the refresh rate of your monitor after opening, then the FPS of your game screen will be limited to the refresh rate of your monitor.

I feel that the original game screen is so comfortable to move. If not, there will be different degrees of frame skipping. The bigger the difference between FPS and refresh rate, the more serious the frame jump will be.

After closing, except for high-speed games, other games basically can't see the phenomenon of picture tearing. Turning off this option will improve the smoothness of the screen.

Function:

Overview of installing houses:

It is precisely because of the existence of vertical synchronization that the game process can be synchronized with the refresh rate of the display, making the picture stable and smooth. Turn off the vertical synchronization signal, of course, you can get faster speed, but in terms of image continuity, the performance is bound to be compromised.

This is also the reason why many users complain that the picture is discontinuous when vertical synchronization is turned off.

How extended data works:

All the images on the display are scanned line by line. Whether interlaced scanning or progressive scanning, the display has two synchronization parameters-horizontal synchronization and vertical synchronization.

Vertical synchronization (Vsync) is added between two frames. Similar to the horizontal synchronization pulse, but it indicates the end of the previous frame and the beginning of a new frame.

Vertical synchronization pulse is a kind of pulse with long duration, which may last for one or several lines of scanning time, but during this period, no pixel signal appears.

References:

Baidu Encyclopedia-Vertical Synchronization