I guess they can. I can with my current laptop but im sure I have had some that won’t go below a certain low leve but could do it with mine. Im not sure modern ones would keep the setting on restart of the pc or screen though. With the old crts they would stay blank until you moved the little dial that a lot of people were unaware of.
crt brightness could be brought down to zero back in the day.
Can that not be done with LCDs and OLEDs? Turn off the backlighting at least?
I guess they can. I can with my current laptop but im sure I have had some that won’t go below a certain low leve but could do it with mine. Im not sure modern ones would keep the setting on restart of the pc or screen though. With the old crts they would stay blank until you moved the little dial that a lot of people were unaware of.