Shut off backlight LCD if no music plays


I just set up volumio on a new pi/hifiberry/nuxii case.

The nuxii set included an I2C display (44780) which is now working.
I was not aware of the fact that the display is lit until power is cut.

Has anybody a solution how to switch backlight off when no music is being played?
I don’t like the idea of unplugging power after listening.

Thanks and regards