Display device and manufacturing method of the same

1 . A display device comprising:

a substrate;

a lower metal layer disposed on the substrate;

a gate metal layer disposed on the lower metal layer,

a buffer layer disposed between the substrate and the lower metal layer; and

a first gate insulating layer disposed between the lower metal layer and the gate metal layer,

wherein the gate metal layer includes:

a first portion covering the lower metal layer in a plan view; and

a second portion protruding in a first direction from the lower metal layer in a plan view, and

wherein the lower metal layer includes a concavo-convex pattern disposed at a portion overlapping the second portion of the gate metal layer, a bottom surface of the concavo-convex pattern in contact with the buffer layer, a side surface of the concavo-convex pattern is in contact with the first gate insulating layer, and an angle formed by the bottom surface and the side surface of the concavo-convex pattern is 50° or less.

2 . The display device of claim 1 , wherein the concavo-convex pattern includes:

a protruding portion protruding away from the first portion in the first direction; and

a recessed portion recessed toward the first portion in the first direction, and

wherein an edge of the second portion of the gate metal layer extending in the first direction overlaps the protruding portion.

3 . The display device of claim 2 , wherein the protruding portion includes a first protruding portion and a second protruding portion spaced apart from each other in a second direction intersecting the first direction, and

wherein the recessed portion is a portion disposed between the first protruding portion and the second protruding portion.

4 . The display device of claim 3 , wherein the edge includes a first edge and a second edge opposing the first edge, and

wherein the first edge overlaps the first protruding portion and the second edge overlaps the second protruding portion.

5 . The display device of claim 4 , wherein at least a portion of the first protruding portion protrudes in the second direction from the first edge, and

wherein at least a portion of the second protruding portion protrudes in the second direction from the second edge.

6 . The display device of claim 5 , wherein the recessed portion is completely covered by the second portion of the gate metal layer.

7 . The display device of claim 3 , wherein a width of the protruding portion in the first direction is 2 μm or less and a width of the protruding portion in the second direction is 2 μm or less.

8 . The display device of claim 7 , wherein a width of the recessed portion in the second direction is 2 μm or less.

9 . The display device of claim 1 , wherein the concavo-convex pattern includes:

a protruding portion protruding away from the first portion in the first direction; and

a recessed portion recessed toward the first portion in the first direction, and

wherein an edge of the second portion of the gate metal layer overlaps the recessed portion.

10 . The display device of claim 9 wherein the recessed portion includes a first recessed portion and a second recessed portion spaced apart from each other in a second direction intersecting the first direction, and

wherein the protruding portion is a portion disposed between the first recessed portion and the second recessed portion.

11 . The display device of claim 10 , wherein the first edge overlaps the first recessed portion, and

wherein the second edge overlaps the second recessed portion.

12 . The display device of claim 11 , wherein at least a portion of the first recessed portion protrudes in the second direction from the first edge, and

at least a portion of the second recessed portion protrudes in the second direction from the second edge.

13 . The display device of claim 12 , wherein the protruding portion is completely covered by the second portion of the gate metal layer.

14 . The display device of claim 10 , wherein

a width of the recessed portion in the second direction is 2 μm or less.

15 . The display device of claim 14 , wherein a width of the protruding portion in the second direction is 2 μm or less.