Display device with bent portion in peripheral area

1. A display device comprising:

a first substrate having a display area provided with an image display function and a first peripheral area not provided with the image display function;

a second substrate having an additional function area provided with an additional function added to the image display function, and a second peripheral area not provided with the additional function;

a first filler between the first substrate and the second substrate;

a first adhesive outside the first filler, the first adhesive bonding the first peripheral area and the second peripheral area, and

a sealing material between the first filler and the first adhesive, wherein

the first substrate has a first bent portion in the first peripheral area,

the second substrate has a second bent portion in the second peripheral area along the first bent portion, and

the first adhesive is between the first bent portion and the second bent portion.

2. The display device according to claim 1 , further comprising:

a third substrate having a touch input area and a third peripheral area;

a second filler between the first substrate and the third substrate or between the second substrate and the third substrate; and

a second adhesive outside the second filler, the second adhesive bonding the first peripheral area and the third peripheral area or the second peripheral area and the third peripheral area,

wherein the third substrate has a third bent portion in the third peripheral area.

3. The display device according to claim 1 , further comprising

a first flexible wiring substrate electrically coupled to a first terminal disposed in the first peripheral area of the first substrate,

wherein the second substrate extends over the first terminal.

4. The display device according to claim 3 , wherein

the first terminal is provided on a side opposite to the display area via the first bent portion in the first substrate.

5. The display device according to claim 2 , further comprising

a second flexible wiring substrate electrically coupled to a second terminal disposed in the third peripheral area of the third substrate,

wherein the second terminal is provided on a side opposite to the touch input area via the third bent portion in the third substrate.

6. The display device according to claim 1 , wherein the sealing material does not adhere the first bent portion.

7. The display device according to claim 1 , further comprising:

a guide which is a cylindrical or columnar member along a transverse direction of the first substrate.

8. The display device according to claim 1 , further comprising:

a guide having a curved surface conforming to the first bent portion, wherein

the first substrate is between the guide and the second substrate.

9. The display device according to claim 1 , wherein

neither internal tensile stress nor internal compressive stress occurs in a bent portion of the first adhesive.

10. The display device according to claim 1 , wherein the first peripheral area has a part and another part which are arranged parallel.