Multi-screen display device for reducing a non-display area between display panels, and manufacturing method thereof

1. A display device comprising first and second display panels adjacent to each other along one direction, wherein:

each of the first and second display panels includes a substrate, and a display portion on the substrate and including a plurality of pixels;

each of the pixels includes:

a pixel circuit layer on the substrate and including a transistor;

a display element layer on the pixel circuit layers; and

at least one light emitting element for emitting light;

the substrate of the first display panel and the substrate of the second display panel each comprise a first surface and a second surface opposite from each other, and are engaged with each other in a plan view and a cross-sectional view;

the display portion of the first display panel and the display portion of the second display panel each comprise a first surface and a second surface opposite from each other, and are engaged with each other in the plan view and the cross-sectional view;

the first surfaces of the substrates of the first and second display panels are coplanar with each other;

the second surfaces of the substrates of the first and second display panels are coplanar with each other; and

a first boundary between the substrate of the first display panel and the substrate of the second display panel, and a second boundary between the display portion of the first display panel, and the display portion of the second display panel, are spaced apart from each other in the one direction.

2. The display device of claim 1 , further comprising an overlapping portion in which the first display panel and the second display panel overlap,

wherein, in the plan view and the cross-sectional view, the overlapping portion is between the first boundary and the second boundary.

3. The display device of claim 2 , wherein the display portion further includes a flexible substrate between the first surface of the substrate and the plurality of pixels.

4. The display device of claim 3 , wherein at least a portion of the display portion of one of the first and second display panels is on the first surface of the substrate of the other one of the first and second display panels in the overlapping portion.

5. The display device of claim 4 , wherein at least a portion of the display portion of the second display panel is on the first surface of the substrate of the first display panel in the overlapping portion.

6. The display device of claim 5 , further comprising an adhesive layer on the first surface of the substrate of the first display panel in the overlapping portion,

wherein the display portion of the second display panel is on the adhesive layer.

7. The display device of claim 5 , wherein in the plan view and the cross-sectional view, the first boundary overlaps the display portion of the second display panel, and

wherein, in the plan view and the cross-sectional view, the second boundary overlaps the substrate of the first display panel.

8. The display device of claim 7 , wherein, in the cross-sectional view, the first boundary is below the display portion of the second display panel.

9. The display device of claim 5 , wherein an edge of the substrate of the first display panel protrudes further toward the second display panel than an edge of the display portion of a the first display panel.

10. The display device of claim 9 , wherein an edge of the display portion of the second display panel protrudes further toward the first display panel than an edge of the substrate of a the second display panel.

11. The display device of claim 4 , wherein at least a portion of the display portion of the first display panel is on the first surface of the substrate of the second display panel.

12. The display device of claim 11 , wherein, in the plan view and the cross-sectional view, the first boundary overlaps the display portion of the first display panel, and

wherein, in the plan view and the cross-sectional view, the second boundary overlaps the substrate of the second display panel.

13. The display device of claim 12 , wherein an edge of the substrate of the second display panel protrudes further toward the first display panel than an edge of the display portion of a the second display panel.

14. The display device of claim 13 , wherein an edge of the display portion of the first display panel protrudes further toward the second display panel than an edge of the substrate of the first display panel.

15. The display device of claim 14 , wherein, in the cross-sectional view, the first boundary is below the display portion of the first display panel.

16. The display device of claim 14 , further comprising an additional member that is between the substrate of the first display panel and the substrate of the second display panel, that is flexible, and that contacts the display portion of the first display panel.

17. The display device of claim 4 , wherein each of the first and second display panels further includes:

at least one contact hole penetrating at least one area of the substrate of a corresponding display panel;

a conductive material in the at least one contact hole; and

a driver on the second surface of the substrate and electrically connected to the conductive material.

18. The display device of claim 1 , wherein the light emitting element includes:

a first electrode electrically connected to the transistor;

an emission layer on the first electrode; and

a second electrode on the emission layer.

19. A display device comprising first and second display panels adjacent to each other along one direction,

wherein each of the first and second display panels includes a substrate, and a display portion on the substrate and including pixels,

wherein each of the pixels includes:

a pixel circuit layer on the substrate and including at least one transistor;

a display element layer on the pixel circuit layer; and

at least one light emitting element for emitting light,

wherein the substrate of the first display panel and the substrate of the second display panel are engaged with each other in a plan view and a cross-sectional view,

wherein the display portion of the first display panel and the display portion of the second display panel are engaged with each other in the plan view and the cross-sectional view,

wherein a first boundary between the substrate of the first display panel and the substrate of the second display panel, and a second boundary between the display portion of the first display panel and the display portion of the second display panel, are spaced apart from each other in the one direction, and

wherein the light emitting element includes:

a first semiconductor layer doped with a first conductive dopant;

a second semiconductor layer doped with a second conductive dopant different from the first conductive dopant; and

an active layer between the first semiconductor layer and the second semiconductor layer.

20. A manufacturing method of a display device, comprising:

preparing a mother substrate in which a first display portion and a second display portion are provided;

separating the mother substrate into a first substrate provided with the first display portion and a second substrate provided with the second display portion by removing a portion of the mother substrate;

removing at least a portion of the first display portion to expose one surface of the first substrate;

removing at least a portion of the second substrate to expose at least a portion of the second display portion;

applying an adhesive resin on the one surface of the first substrate; and

bonding the first substrate and the second substrate after applying the second display portion on the adhesive resin.