A foldable display device, comprising: a liquid crystal panel; and a backlight module, comprising: a light source; and a diffusion plate, disposed directly opposite a light exiting surface of the light source, wherein, in an expanded state, a light incident surface of the liquid crystal panel is disposed opposite a light exiting surface of the diffusion plate, and a predetermined diffusion distance is between the light incident surface of the liquid crystal panel and the light exiting surface of the diffusion plate, a panel surface size of the liquid crystal panel is substantially equivalent to the size of a light-radiating region of the backlight module at the panel surface of the liquid crystal panel, the backlight module comprises a light source positioning groove, and the display device comprises two liquid crystal panel frames, disposed on two opposite sides of the liquid crystal panel extending along the length direction of the backlight module, characterized in that: the display device further comprises two supporting members (6,7), wherein one of the two supporting members is pivotally connected to one of the two liquid crystal panel frames and to one of two opposite sides of the light source positioning groove in a width direction of the backlight module, and the other one of the two supporting members is pivotally connected to the other one of the two opposite sides of the light source positioning groove in a width direction of the backlight module, and when the display device is in an expanded state, the other one of the two supporting members is provided between the other one of the two liquid crystal panel frames and the other one of the two opposite sides of the light source positioning groove in a width direction of the backlight module, and when the display device is in a folded state, the light exiting surface of the diffusion plate is disposed opposite one of the two opposite sides of the liquid crystal panel extending along a length direction of the backlight module, and the backlight module and the liquid crystal panel are sandwiched between the supporting members for protection. a liquid crystal panel; and a backlight module, comprising: a light source; and a diffusion plate, disposed directly opposite a light exiting surface of the light source, a light source; and a diffusion plate, disposed directly opposite a light exiting surface of the light source, wherein, in an expanded state, a light incident surface of the liquid crystal panel is disposed opposite a light exiting surface of the diffusion plate, and a predetermined diffusion distance is between the light incident surface of the liquid crystal panel and the light exiting surface of the diffusion plate, a panel surface size of the liquid crystal panel is substantially equivalent to the size of a light-radiating region of the backlight module at the panel surface of the liquid crystal panel, the backlight module comprises a light source positioning groove, and the display device comprises two liquid crystal panel frames, disposed on two opposite sides of the liquid crystal panel extending along the length direction of the backlight module, characterized in that: the display device further comprises two supporting members (6,7), wherein one of the two supporting members is pivotally connected to one of the two liquid crystal panel frames and to one of two opposite sides of the light source positioning groove in a width direction of the backlight module, and the other one of the two supporting members is pivotally connected to the other one of the two opposite sides of the light source positioning groove in a width direction of the backlight module, and when the display device is in an expanded state, the other one of the two supporting members is provided between the other one of the two liquid crystal panel frames and the other one of the two opposite sides of the light source positioning groove in a width direction of the backlight module, and when the display device is in a folded state, the light exiting surface of the diffusion plate is disposed opposite one of the two opposite sides of the liquid crystal panel extending along a length direction of the backlight module, and the backlight module and the liquid crystal panel are sandwiched between the supporting members for protection. the display device further comprises two supporting members (6,7), wherein one of the two supporting members is pivotally connected to one of the two liquid crystal panel frames and to one of two opposite sides of the light source positioning groove in a width direction of the backlight module, and the other one of the two supporting members is pivotally connected to the other one of the two opposite sides of the light source positioning groove in a width direction of the backlight module, and when the display device is in an expanded state, the other one of the two supporting members is provided between the other one of the two liquid crystal panel frames and the other one of the two opposite sides of the light source positioning groove in a width direction of the backlight module, and when the display device is in a folded state, the light exiting surface of the diffusion plate is disposed opposite one of the two opposite sides of the liquid crystal panel extending along a length direction of the backlight module, and the backlight module and the liquid crystal panel are sandwiched between the supporting members for protection.