Screen turn off

My laptop is acer E15. my setting on plugged and battery after 5 minutes the creen will auto off. it is not hibernated or sleeping neither shutdown. the blue lights indicates that it is on. but after few minutes leaving it as it is and when you want to use it again you have to touch any of the keyboard or mouse in order to open your screen. but unfortunate it does not open it keeps the lcd or screen off.;y