@a-i-ks

Raspbian still seems to turn off the display.

Personally, I would install xscreensaver and use that to disable the screensaver.

In your terminal
sudo apt-get install xscreensaver

THEN
sudo reboot

Run xscreensaver. Choose Disable Screensaver. Done.

@yawns Thank you!

vcgencmd display_power 0

and

vcgencmd display_power 1

worked for me!