A controlling method for an electronic device includes: determining an orientation of a laser projector; projecting a laser in a first mode by the laser projector when the laser projector is oriented toward a first side where the display screen is located; and projecting a laser in a second mode by the laser projector when the laser projector is oriented toward a second side opposite to the display screen, and the laser projected in the second mode has a greater energy than that of the laser projected in the first mode.