Brightness of my laptop is too low?

I had 1 month laptop ban, after 1 month I got my laptop back and wanted to turn it on briefly. I noticed that the display remained black, after a short examination I found that you can only see very little when I'm with mine Handy light area the display can enter my password even in League of Legends only go in that the brightness is too low

LG, Thanks in advance in advance

Fn + F2 on some Lenovo devices [icon with screen and cross]
Right-click on the battery icon in the taskbar -> Screen brightness -> Move slider

Evtll. After you have moved the slider: Screen on and to make and in the settings before: Right click Battery icon -> Select what happens when you close the computer -> When closing ---> Do nothing