A display device may include a foldable display member. The foldable display member may include a first portion, a second portion, and a bendable portion. The first portion may be connected through the bendable portion to the second portion. The display device may further include a first controllable member that may overlap the bendable portion. The display device may further include a control unit connected to the first controllable member and configured to provide a first signal to control a size of the first controllable member according to a magnitude of an angle between the first portion and the second portion.