Display device

1. A display device, comprising a display screen, a back plate arranged on a back of the display screen, and a support, the back plate being arranged on the support, wherein the back plate is a spliced back plate, and the display screen is a flexible display screen; and the back plate allows the display screen to be converted between a curved display state and a flat display state,

the display device is characterized in that the back plate comprises a central-axis sub-plate, intermediate sub-plates and border sub-plates; the central-axis sub-plate is arranged in a vertical central region of the display screen and connected with the support; the plurality of intermediate sub-plates are symmetrically distributed along a horizontal direction of the central-axis sub-plate about a vertical axis of the central-axis sub-plate as a symmetry axis; the border sub-plates are arranged on outer sides of the intermediate sub-plates away from the central-axis sub-plate; and the central-axis sub-plate, the plurality of intermediate sub-plates and the border sub-plates are movably connected.

2. The display device according to claim 1 , wherein horizontal position-limiting units are arranged on borders of adjacent sub-plates, among the central-axis sub-plate, the plurality of intermediate sub-plates and the border sub-plates, the horizontal position-limiting units comprising recesses, the recesses in the adjacent sub-plates being adapted to each other, and a gap being preset between inner walls of borders of every adjacent sub-plates;

and further, vertical position-limiting units are also arranged on adjacent borders, the vertical position-limiting units comprising protrusions that are formed on upper sides and/or lower sides of the adjacent borders respectively and are capable of clamping the adjacent borders.

3. The display device according to claim 2 , wherein outer edges of the borders provided with the recesses are configured with rounded angles.

4. The display device according to claim 3 , further comprising a front frame, a back cover and a seat, wherein the front frame is arranged on borders of the front side of the display screen and is in bonded connection with the display screen; and the back cover is located behind the support, and the back cover and the seat are connected to the central-axis sub-plate.

5. The display device according to claim 2 , further comprising a front frame, a back cover and a seat, wherein the front frame is arranged on borders of the front side of the display screen and is in bonded connection with the display screen; and the back cover is located behind the support, and the back cover and the seat are connected to the central-axis sub-plate.

6. The display device according to claim 1 , wherein the central-axis sub-plate, the intermediate sub-plates and the border sub-plates have the same heights in a vertical direction; the central-axis sub-plate, the intermediate sub-plates and the border sub-plates have the same thicknesses; and the central-axis sub-plate, the intermediate sub-plates and the border sub-plates have the same widths, or the width of the central-axis sub-plate is larger than the width of the intermediate sub-plates and the width of the border sub-plates.

7. The display device according to claim 6 , further comprising a front frame, a back cover and a seat, wherein the front frame is arranged on borders of the front side of the display screen and is in bonded connection with the display screen; and the back cover is located behind the support, and the back cover and the seat are connected to the central-axis sub-plate.

8. The display device according to claim 1 , wherein the central-axis sub-plate, the intermediate sub-plates and the border sub-plates are all formed by a carbon fiber material.

9. The display device according to claim 1 , further comprising a power module and a transmission module, wherein the transmission module is arranged on a back of the border sub-plates; the power module is arranged on the support, and a power output portion of the power module is in contact with the transmission module; and the power module drives the transmission module, and the transmission module drives borders of the back plate to move forward or backward.

10. The display device according to claim 9 , wherein the power module comprises motors, and the transmission module comprises a slide rail arranged on the back of the border sub-plates and sliding blocks sliding along the slide rail; and the motors are arranged in regions of the support corresponding to the border sub-plates, and output shafts of the motors are connected to the sliding blocks.

11. The display device according to claim 10 , wherein the motors are piston-type motors, and the extending direction of the slide rail is perpendicular to the vertical axis of the central-axis sub-plate.

12. The display device according to claim 1 , further comprising a shaping module, which is fixedly connected to the border sub-plates and movably connected to the central-axis sub-plate and the intermediate sub-plates respectively.

13. The display device according to claim 12 , wherein the shaping module comprises a chain or an elastic strip; an extending direction of the chain or the elastic strip is perpendicular to the vertical axis of the central-axis sub-plate; and the chain or the elastic strip is fixedly connected to the border sub-plates, and movably connected to the borders on both sides of the central-axis sub-plate and the intermediate sub-plates respectively.

14. The display device according to claim 1 , wherein the display screen is in bonded connection with the central-axis sub-plate, the intermediate sub-plates and the border sub-plates respectively.

15. The display device according to claim 14 , wherein middle vertical regions of the central-axis sub-plate, the intermediate sub-plates and the border sub-plates are provided with an adhesive respectively, and the display screen is connected to the central-axis sub-plate, the intermediate sub-plates and the border sub-plates through the adhesives respectively.

16. The display device according to claim 1 , further comprising a Tcon board, an SOC board, a power board and speakers, and the Tcon board, the SOC board, the power board and the speakers are arranged on the support.

17. The display device according to claim 1 , wherein the support is formed by a metal material, and the support is provided with reinforcing ribs on the back.

18. The display device according to claim 1 , further comprising a front frame, a back cover and a seat, wherein the front frame is arranged on borders of the front side of the display screen and is in bonded connection with the display screen; and the back cover is located behind the support, and the back cover and the seat are connected to the central-axis sub-plate.