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First, how to adjust the brightness of the laptop screen? First, look at the symbol of the fn key on the keyboard. Both brightness (marking like a sun, increasing and decreasing black) are in this position. Generally, these two signs are designed at F 1 F 12. If you look carefully, you should be able to find it, and then press fn to stay healthy. If you want to be brighter, press it. If you want to dim, press the fn key. In addition, the contrast adjustment method is as follows: right-click in an empty screen, click Properties, click Settings in the prompt bar, set the contrast, click Apply, and then click OK. Second, how to adjust the brightness of the desktop computer screen If you use a liquid crystal display, the brightness level of the screen is very simple. Generally speaking, there are several adjustment buttons at the bottom of LCD. You can look at the details. There is a main menu button. Enter the options to find the brightness level and adjust the appropriate brightness.