A display device includes a flexible display panel. The flexible display device includes a first display portion, a second display portion, and a bendable portion. The bendable portion is configured to be bendable to allow the first display portion and the second display portion to be located at different planes. A sensor is disposed in the flexible display panel and configured to detect whether the bendable portion is bending. A control module is disposed in the flexible display panel and electrically connected to the sensor. The control module enables the first display portion to display a first image and enables the second display portion to display a second image when the sensor detects that the bendable portion is bending.