Animal Crossing 3DS.com

Hi,

I have a ThinkPad Tablet 2. Last night I wanted to download a file, but I had a problem. I started my download through Internet Download Manager, but I couldn't turn off the display off without stopping the download. 
I closed the case lid ( screen turns off by that ) and I pushed the power button but every time I did that the download stopped. I don't want to see the bight light of the screen ( even at lowest ) when I go to sleep !
Any suggestion guys ?

Please help.

I didn't find the right solution from the Internet.

References:-
https://bit.ly/2s06uns
Infographic design service

Thanks