An electronic apparatus, comprising: a casing, comprising: a middle frame having a first side and a second side opposite the first side; a first frame rotatably attached to the first side of the middle frame; and a second frame rotatably attached to the second side of the middle frame; and a foldable display screen comprising a back surface attached to the middle frame, the first frame, and the second frame of the casing, and a display surface opposite the back surface and configured to display visual information, the foldable display screen being operable to be folded along the first side of the middle frame to be in a first state, and being operable to be folded along the second side of the middle frame to be in a second state, and furthermore being operable to be in an unfolded state; the display surface being invisible in the first state, and part of the display surface being visible and the remaining part of the display surface being invisible in the second state; characterized by: a first position sensor being disposed at the end of the first frame away from the middle frame; and a second position sensor being disposed at the end of the second frame away from the middle frame; and a controller, electrically coupled to said first and second position sensor, the controller being configured to determine whether the foldable display screen is in the first state, the second state, or in the unfolded state according to a relative positional relationship between the first position sensor and the second position sensor. a casing, comprising: a middle frame having a first side and a second side opposite the first side; a first frame rotatably attached to the first side of the middle frame; and a second frame rotatably attached to the second side of the middle frame; and a middle frame having a first side and a second side opposite the first side; a first frame rotatably attached to the first side of the middle frame; and a second frame rotatably attached to the second side of the middle frame; and a foldable display screen comprising a back surface attached to the middle frame, the first frame, and the second frame of the casing, and a display surface opposite the back surface and configured to display visual information, the foldable display screen being operable to be folded along the first side of the middle frame to be in a first state, and being operable to be folded along the second side of the middle frame to be in a second state, and furthermore being operable to be in an unfolded state; the display surface being invisible in the first state, and part of the display surface being visible and the remaining part of the display surface being invisible in the second state; characterized by: a first position sensor being disposed at the end of the first frame away from the middle frame; and a second position sensor being disposed at the end of the second frame away from the middle frame; and a controller, electrically coupled to said first and second position sensor, the controller being configured to determine whether the foldable display screen is in the first state, the second state, or in the unfolded state according to a relative positional relationship between the first position sensor and the second position sensor. a first position sensor being disposed at the end of the first frame away from the middle frame; and a second position sensor being disposed at the end of the second frame away from the middle frame; and a controller, electrically coupled to said first and second position sensor, the controller being configured to determine whether the foldable display screen is in the first state, the second state, or in the unfolded state according to a relative positional relationship between the first position sensor and the second position sensor.