Flexible substrate and flexible display device including the same
A flexible substrate and a flexible display device including the same are disclosed. In one aspect, the flexible substrate includes a first substrate that is flexible and a metal wiring layer over the first substrate and having a first surface facing the first substrate, a second surface opposite to the first surface, and a plurality of holes penetrating the first and second surfaces. The holes are arranged in a plurality of rows. The holes comprise a first hole in an n-th row and a first hole in a (n−1)th row. The first hole of the n-th row is spaced apart from the first hole in the (n−1)th row by a first distance, and an edge of each of the holes is curved.
1. A flexible substrate for a display device, comprising:
a first substrate that is flexible; and
a metal wiring layer over the first substrate and having a first surface, a second surface opposite to the first surface, and a plurality of holes penetrating the first and second surfaces,
wherein the holes are arranged in a plurality of rows,
wherein the holes comprise a first hole in an n-th row and a first hole in a (n−1)th row,
wherein the first hole of the n-th row is spaced apart from the first hole in the (n−1)th row by a first distance,
wherein an edge of each of the holes is curved,
wherein the first substrate has a same thickness in a region where the plurality of holes are formed and in a region where the metal wiring layer is formed, wherein an entirety of each of the plurality of holes penetrates the metal wiring layer to a level at which the second surface of the metal wiring layer directly contacts an upper surface of the first substrate, wherein each of the holes has a first curved portion and a second curved portion,
wherein the first curved portion includes a first concave portion protruding in a first direction,
wherein the second curved portion includes a third concave portion protruding in the first direction, and
wherein the first concave portion is connected to the third concave portion to form a point.
2. The flexible substrate of claim 1 , wherein the first distance is less than a width of a second hole of the plurality of holes.
3. The flexible substrate of claim 1 , wherein the first substrate comprises an area that is bent or folded, and wherein the holes are arranged in the metal wiring layer at a position directly over the area.
4. The flexible substrate of claim 1 , wherein the holes have a same shape.
5. The flexible substrate of claim 1 , wherein each of the first and second curved portions comprises a plurality of round sections.
6. The flexible substrate of claim 5 , wherein the first curved portion further comprises:
a second section connected to the first concave portion and having a convex shape; and
a third section connected to the second section and having a concave shape.
7. The flexible substrate of claim 6 , wherein the first concave portion and the third section are curved toward each other.
8. The flexible substrate of claim 6 , wherein the first and second curved portions are symmetrical to each other with respect to a first axis extending in the first direction.
9. The flexible substrate of claim 8 , wherein the first concave portion and the third section are symmetrical to each other with respect to a second axis extending in a second direction that is perpendicular to the first direction.
10. The flexible substrate of claim 6 , wherein the first and second curved portions are symmetrical with respect to a second axis extending in a second direction crossing the first direction.
11. The flexible substrate of claim 1 , further comprising an insulating layer provided over the metal wiring layer.
12. The flexible substrate of claim 1 , wherein each hole has four concave portions that are connected at four corners.
13. The flexible substrate of claim 1 , wherein the first curved portion further includes:
a first convex portion connected to the first concave portion and protruding in a second direction crossing the first direction; and
a second concave portion connected to the first convex portion and protruding toward the first concave portion.