About delayed power down
Working with the same image or an application with static image elements (e.g. toolbars, icons) during almost a full working day continuously may result in a form of image retention. You can avoid or significantly reduce the occurrence of this phenomenon by enabling the delayed power down option.
This option will keep the display’s backlight running for 4 hours after DPMS mode is activated (instead of immediately switching off the backlight upon DPMS activation).