Samsung SPD300BX-XAA - Manual (Page 31)

It is displayed in the form of an ellipse at the top of the projector .
Blue sreen The Blue screen function causes the screen to change to the Blue screen if there is no
signal input from the external device connected to your projector.
1) Off
2) On
Information You can check external source signals, picture setup, PC picture adjustment and lamp
use time.