The argument seems trivial, but for those who need to change the brightness of the computer screen frequently, because it uses it at various times of the day or in different environments, depending on whether there is a lot of light around or if you work in a room dark. In this second case it is never better to keep the brightness high so as not to tire or make the eyes water.
Decreasing the screen brightness can also be very useful for saving energy and increasing the battery life of the laptop.
In addition, in addition to the possibility of manually changing the brightness of the screen, it is possible to make sure that the brightness is automatically changed according to certain factors such as: whether or not the laptop is attached to the power outlet, whether the battery is charged or almost discharged, if there is an integrated ambient light sensor that detects, as in mobile phones, if the environment is bright or dark.
You can also use some programs to automatically adjust the brightness of the monitor according to the time.
To manually change the brightness of a laptop screen you should find the buttons on the computer keyboard.
Generally this adjustment is made with the Fn keys plus the keys the F7 or F8 keys.
If they are not those, just find the sun icon or something similar on the F1 to F12 keys at the top.
In Windows 10, you can also adjust the brightness of the laptop screen by clicking on the battery icon in the notification area near the clock, increasing the brightness by 25% each time you touch the sun icon.
The brightness of the monitor can also be changed (in Windows 10) from the Settings -> System menu.
In Windows 7 and 8.1 change the brightness of the monitor if there are no hotkeys you need to open the Control Panel, then go to Hardware and Sound -> Power Options where you should find the slider that adjusts the brightness of the screen at the bottom of the window.
In every version of Windows, on portable PCs, you can still open the Portable PC Center where you can find the slider for adjusting the brightness.
To find the Portable PC Center you can open the Control Panel or press the Windows-X keys or, in Windows 8.1 and Windows 10, by pressing the right mouse button on the Start menu.
How to adjust brightness manually on an external screen .
On Desktop PCs or on any monitor connected to the laptop, the brightness of the screen can be changed only by the physical buttons of the monitor itself.
Then find, near the power button of the screen. the Menu / Options button or directly the brightness buttons to change it and set it as you prefer.
With some monitors you can also adjust the brightness of the screen with a PC program such as ScreenBright or Display Tuner, both free and to try.
On Windows 7 the iBrightness program can also work, to change the brightness of the screen with the mouse and also to turn off the monitor with a click.
PangoBright is instead a simple and small program to change the screen brightness in percentage, always at hand.
DimScreen is a small portable program for darkening the screen with hotkeys or changing the lighting of the monitor from the keyboard, both on laptops and on fixed computers.
As mentioned at the beginning, on laptops you can automatically adjust the brightness when depending on whether it is connected to the power outlet or if it runs on battery power .
Windows uses standard energy saving profiles, the default one being the balanced profile.
Here you can configure different brightness levels of the laptop screen with a higher level when connected to the power outlet and lower when powered only by the battery.
These options are found from Control Panel> Hardware and Sound> Power Options, by clicking on the " Change combination settings " link next to the activated profile (the balanced one if nothing has been changed).
To automatically change the screen brightness based on the remaining battery charge you can use the battery saving mode of Windows 10, under Settings -> System .
Here you can activate the option that minimizes the screen brightness when the battery is low.
By default, Windows 10's battery saver feature lowers the screen brightness when the battery is only 20% charged (but this can be changed).
There is instead (for now) the option to choose which level of brightness to lower it.
Automatically adjusting brightness based on ambient light is only possible on some computers equipped with a light sensor.
Many new laptops and all tablets have this ambient light sensor that works similarly to smartphones.
Windows can use the sensor for adaptive brightness and automatically increase the brightness of the screen when you are in a bright area or decrease it when you are in a dark room.
To activate or deactivate this feature in Windows 10, open the Settings application -> System -> Display and activate the option to automatically change brightness according to the ambient light.
In Windows 7, 10 and 8 the same option is in Control Panel> Hardware and Sound> Power Options, by clicking on " Change combination settings " and then on " Change advanced power settings "
From the " Screen " section, press on " Activate adaptive brightness ".
In this case it is also possible to choose whether to activate this option only when the computer is running on battery or always.
Finally, even on PCs without a light sensor and on desktop PCs with an external monitor it is possible to use a program like F.Lux to adjust the brightness and color of the screen according to the time .
Alternatively, you can also choose to use night mode on the screen .
