Display device having a reduced cell seal area and method of manufacturing display device

1. A display device, comprising:

a first substrate in which a display area and a non-display area disposed outside the display area are defined;

a second substrate facing the first substrate;

a cell seal disposed on the non-display area;

a driving integrated circuit disposed on the non-display area;

a plurality of conductive lines connecting the driving integrated circuit and the display area; and

an insulation film disposed on the non-display area,

wherein the cell seal includes:

a bonding filament which is in direct contact with the first substrate and the second substrate and comprises a same material as the first substrate and the second substrate, and

a frit seal,

wherein the bonding filament and the frit seal are directly connected to each other, form a closed curve, and seal the display area,

wherein the conductive lines overlap the frit seal and does not overlap the bonding filament in a plan view,

wherein the insulation film is not disposed on an area on which the bonding filament is disposed, and

wherein the frit seal overlaps the insulation film.

2. The display device of claim 1 ,

wherein each of the first substrate and the second substrate comprises glass.

3. The display device of claim 1 ,

wherein the bonding filament has a width in a range of about 100 micrometers to about 200 micrometers.

4. The display device of claim 1 ,

wherein the bonding filament comprises a central portion and a peripheral portion surrounding the central portion.

5. The display device of claim 4 ,

wherein the central portion, having a refractive index different from a refractive index of the peripheral portion, has a width in a range of about 20 micrometers to about 70 micrometers.

6. The display device of claim 1 ,

wherein a width of a middle end of the bonding filament is greater than a width of an upper end of the bonding filament and a width of a lower end of the bonding filament.

7. The display device of claim 1 ,

wherein the bonding filament comprises an inner bonding filament and an outer bonding filament.

8. The display device of claim 7 ,

wherein the inner bonding filament and the outer bonding filament partially overlap each other.

9. A display device, comprising:

a first substrate in which a display area and a non-display area disposed outside the display area are defined;

a second substrate facing the first substrate;

a cell seal disposed on the non-display area; and

an insulation film disposed on the non-display area,

wherein the cell seal includes a bonding filament which is in direct contact with the first substrate and the second substrate and comprises a same material as the first substrate and the second substrate,

wherein the insulation film is not disposed on an area on which the bonding filament is disposed,

wherein the bonding filament comprises an inner bonding filament and an outer bonding filament,

wherein the inner bonding filament and the outer bonding filament partially overlap each other, and

wherein a refractive index of an overlap area of the inner bonding filament and the outer bonding filament and a refractive index of a peripheral portion of the inner bonding filament are different from each other.

10. The display device of claim 7 ,

wherein at least one of the inner bonding filament and the outer bonding filament is inclined at a predetermined inclination angle with respect to a thickness direction of the first substrate.

11. The display device of claim 10 ,

wherein the inner bonding filament and the outer bonding filament intersect each other.

12. The display device of claim 1 ,

wherein the bonding filament comprises:

a first bonding filament extending in a direction parallel to an X-axis;

a second bonding filament extending in a direction parallel to a Y-axis; and

an intersection portion at which the first bonding filament and the second bonding filament intersect each other.

13. The display device of claim 12 ,

wherein a width of an intersection portion of the first bonding filament and the second bonding filament is greater than a width of the first bonding filament and greater than a width of the second bonding filament.

14. The display device of claim 13 ,

wherein one end of the first bonding filament protrudes from the intersection portion in a direction parallel to the X-axis, and

wherein one end of the second bonding filament protrudes from the intersection portion in a direction parallel to the Y-axis.

15. The display device of claim 1 ,

wherein a width of the bonding filament is smaller than a width of the frit seal.