Display device

1. A display device, comprising:

a housing body;

a first shaft, wherein the first shaft is rotatably mounted at two opposite inner sidewalls of the housing body;

a first roller, wherein the first roller is sleeved on an exterior of the first shaft and is firmly connected to the first shaft;

a flexible display screen, wherein the flexible display screen is spirally sleeved on an outer surface of the first roller, an end of the flexible display screen is connected to the first roller, and another end of the flexible display screen is near an exterior of the housing body;

a main board, wherein the main board is attached to an interior of the first roller or the exterior of the housing body; and

a flexible circuit board, wherein the flexible circuit board is connected to the end of the flexible display screen and is connected to the main board;

a second shaft, wherein the second shaft is rotatably mounted at two opposite inner sidewalls of the housing body, and a central axis of the second shaft is parallel to a central axis of the first shaft; and

a second roller, wherein the second roller is sleeved on an exterior of the second shaft and is firmly connected to the second shaft;

a changeover flexible circuit board, wherein the changeover flexible circuit board surrounds the first shaft and is disposed between the outer surface of the first roller and an inner surface of the flexible display screen, an end of the changeover flexible circuit board is connected to the main board, and another end of the changeover flexible circuit board is connected to the flexible circuit board, and the changeover flexible circuit board surrounds the first roller and the second roller such that the first roller and the second roller contact and guide the changeover flexible circuit board to extend or retract with the flexible display screen;

wherein when the flexible display screen is rolled up, the flexible display screen is tangent to an outer surface of the second roller;

wherein when the display device is in use, the entire flexible display screen is stretched to the exterior of the housing body.

2. The display device of claim 1 , further comprising:

a first connector disposed on the main board; and

a second connector disposed on the flexible circuit board and electrically connected to the first connector.

3. The display device of claim 1 , wherein the first roller comprises:

a main body of the first roller, wherein the main body of the first roller is a cylinder; and

an opening of the first roller, wherein the opening of the first roller is defined on a sidewall of the main body of the first roller;

wherein the main board is disposed in the main body of the first roller and corresponds to the opening of the first roller; and

the flexible circuit board is disposed at the opening of the first roller and is attached to the main board.

4. The display device of claim 3 , wherein the first roller further comprises:

a filling substance, wherein the filling substance is attached to a surface of the flexible circuit board and fills the opening of the first roller;

wherein an outer surface of the filling substance and an outer sidewall of the main body of the first roller is disposed at a same curved surface.

5. The display device of claim 1 , wherein a sidewall of the housing body is provided with an opening of the housing body, and the flexible display screen passes through the opening of the housing body.

6. The display device of claim 1 , wherein the central axis of the first shaft is parallel to a sidewall of the housing body provided with an opening of the housing body; and

a distance between the sidewall of the housing body provided with the opening of the housing body and the central axis of the second shaft is greater than a distance between the sidewall of the housing body provided with the opening of the housing body and the central axis of the first shaft; or

the distance between the sidewall of the housing body provided with the opening of the housing body and the central axis of the second shaft is less than the distance between the sidewall of the housing body provided with the opening of the housing body and the central axis of the first shaft.

7. The display device of claim 6 , further comprising:

a back board, wherein the back board is spirally sleeved on the outer surface of the second roller;

wherein when the display device is in use, the flexible display screen is disposed on the back board.

8. The display device of claim 1 , further comprising:

a fixing board, wherein the fixing board is mounted at the first roller and is connected to the end of the flexible display screen.