Display device

1. A display device comprising:

a first substrate comprising a first relay electrode, a second relay electrode, and a first insulating layer including a first contact hole penetrated to the first relay electrode and a second contact hole penetrated to the second relay electrode;

a second substrate opposed to the first substrate; and

a main spacer located between the first substrate and the second substrate,

the first insulating layer further including a first concavity located between the first contact hole and the second contact hole,

the main spacer being located in the first concavity, and maintaining a cell gap between the first substrate and the second substrate.

2. The display device of claim 1 , wherein a depth of the first concavity is less than or equal to a depth of the first contact hole.

3. The display device of claim 2 , wherein the depth of the first concavity is 0.5 μm or more.

4. The display device of claim 1 , wherein:

the first substrate further comprises a common electrode located on the first insulating layer; and

the common electrode includes a single aperture surrounding the first contact hole, the first concavity, and the second contact hole.

5. The display device of claim 4 , wherein:

the first substrate further comprises a first signal line and a second signal line;

the first relay electrode is located between the first signal line and the second signal line; and

the first concavity is located directly above the second signal line.

6. The display device of claim 5 , wherein:

the first insulating layer has a first thickness directly above the first signal line, and a second thickness directly above the second signal line; and

the second thickness is less than the first thickness.

7. The display device of claim 6 , wherein:

the common electrode extends along the first signal line.

8. The display device of claim 5 , wherein:

the first insulating layer is an organic insulating layer, and includes a first upper surface directly above the first signal line, and a second upper surface directly above the second signal line; and

the main spacer includes an end portion, and a position of the end portion is below the first upper surface, and above the second upper surface.

9. The display device of claim 8 , wherein the first substrate further comprises a second insulating layer which is in contact with the second upper surface, and an alignment film which is in contact with the second insulating layer and the end portion.

10. The display device of claim 9 , wherein:

the first substrate further comprises a pixel electrode located on the second insulating layer, and being electrically connected to the first relay electrode at the first contact hole;

the second insulating layer is an inorganic insulating layer located between the pixel electrode and the common electrode; and

the alignment film covers the second insulating layer and the pixel electrode.

11. The display device of claim 1 , wherein:

the second substrate comprises a light-shielding portion overlapping the main spacer; and

the first concavity is greater than the main spacer, and smaller than the light-shielding portion in planar view.

12. The display device of claim 1 , further comprising a sub-spacer located between the first substrate and the second substrate, and being separated from the first substrate, wherein

the first insulating layer further includes a second concavity opposed to the sub-spacer, and

a depth of the second concavity is less than or equal to a depth of the first concavity.

13. The display device of claim 12 , wherein the second concavity is greater than the sub-spacer, and smaller than the first concavity in planar view.

14. A display device comprising:

a first substrate comprising an organic insulating layer including a first concavity and a second concavity;

a second substrate opposed to the first substrate;

a main spacer, which is provided on the second substrate, is located in the first concavity, and maintains a cell gap between the first substrate and the second substrate; and

a sub-spacer, which is provided on the second substrate, is opposed to the second concavity, and is separated from the first substrate, wherein:

the organic insulating layer includes first to fourth contact holes arranged along a first direction;

the first concavity is located between the first contact hole and the second contact hole;

the second concavity is located between the third contact hole and the fourth contact hole.

15. The display device of claim 14 , wherein:

the first substrate further comprises a first signal line, a second signal line located directly below the main spacer, and a third signal line located directly below the sub-spacer;

each of the first to third signal lines extends in a second direction intersecting the first direction;

the organic insulating layer includes a first upper surface directly above the first signal line, a second upper surface directly above the second signal line, and a third upper surface directly above the third signal line; and

the second upper surface and the third upper surface are positioned lower than the first upper surface.

16. The display device of claim 15 , wherein:

the main spacer includes an end portion; and

a position of the end portion is below the first upper portion, and above the second upper surface.

17. The display device of claim 16 , wherein the first substrate further comprises a second insulating layer which is in contact with the second upper surface and the third upper surface, and an alignment film which is in contact with the second insulating layer and the end portion.

18. The display device of claim 17 , wherein:

the first substrate further comprises a common electrode which is in contact with the first upper surface, and is covered with the alignment film; and

the common electrode is not in contact with both of the second upper surface and the third upper surface.

19. The display device of claim 18 , further comprising a liquid crystal layer interposed between the sub-spacer and the alignment film.