Unfortunately not every laptop has a basic button or combination key that can be used to manually turn off the LCD screen. Some laptops have a shortcut F key combined with the Fn key to turn the LCD screen off and then by pressing any key will turn it back on. The best option is to manually turn off the laptop’s LCD screen as and when you want to. While this works, setting it to kick in too fast can be annoying because you don’t want the screen to go off when in the middle of reading something. The Power Options in Windows have a setting to turn off the monitor after xx amount of minutes when your computer is idle. Even if the laptop is plugged in, saving a tiny amount of electricity and also possibly leaving the laptop slightly cooler all help in their own small way.
The main reason I turn the screen off is I think that it’s pretty logical that doing so will save at least some power and prolong the charge in the battery. Whenever I stop using my laptop but I decide to leave it turned on while on the battery, I’ll make sure that I turn off the LCD screen.
