Command will run to turn the projector on. Suitable for sending command through infrared and HDMI-CEC
You can find some example, they may not compatible with your display
To cut the signal
/opt/vc/bin/tvservice -o
To restore the signal
/opt/vc/bin/tvservice -p
Turns off the display
echo "standby 0" | cec-client -s
Turns on the display
echo "on 0" | cec-client -s