Because the brightness is improved when you look at it. The high brightness of Tencent video is mainly because the screen brightness is too high when watching, and it can be adjusted by itself. If you dim the brightness, you can pull it to the left on the screen by hand to brighten the darkness. Adjust the brightness of Tencent video. You can also open the menu bar icon of Tencent Video, click Settings, click Screen Settings to find and click Screen Settings, set the brightness, click Apply to set the brightness you want, and then click Apply.