This disclosure discloses a display device switchable between a 2D display mode and a 3D display mode, wherein a parallax barrier is disposed between a first polarizer and a backlight to implement glassless-type 3D display. A first transparent electrode, an electroluminescent layer, and a second transparent electrode are sequentially disposed between the first polarizer and the parallax barrier, the first transparent electrode and/or the second transparent electrode at least having a pattern corresponding to opaque stripes of a slit light source. Switchover between the 2D display mode and the 3D display mode may be implemented by controlling whether or not to apply a voltage to the electroluminescent layer. The switchover between a 2D display mode and a 3D display mode may be implemented only by adding an electroluminescent layer, and the thickness of the display device is not increased.