One or more embodiments of the present disclosure may include: a transparent member; a housing coupled to the transparent member in a rotatable manner via a hinge portion, such that the housing is foldable in a designated direction with respect to the transparent member; a projector at least partially disposed in the housing; and an optical transferring member configured to guide light emitted from the projector to the transparent member when the housing is unfolded with respect to the transparent member in an unfolded state.