Display device

1. A foldable display device including a display panel, the display device comprising:

a folding line extending in a first direction;

a first non-folding area disposed on a first side of the folding line and which extends in a second direction perpendicular to the first direction;

a second non-folding area disposed on a second side of the folding line opposite the first side and which extends in the second direction; and

a through hole defined in the first non-folding area and which penetrates the display panel in a thickness direction,

wherein in a plan view, a first maximum width of the through hole in the first direction is smaller than a second maximum width of the through hole in the second direction,

wherein the second maximum width of the through hole is in a range of about 1.05 to about 1.2 times the first maximum width.

2. The display device of claim 1 , wherein the second maximum width of the through hole is in a range of about 3 to about 4 millimeters (mm), and the first maximum width of the through hole is in a range of about 2.7 to about 3.8 mm.

3. The display device of claim 2 , wherein the through hole has an elliptical shape in the plan view.

4. The display device of claim 1 , further comprising an optical element disposed to overlap an inside of the through hole in the plan view and including a light receiving portion.

5. The display device of claim 4 , wherein the through hole includes a first inner wall and a second inner wall facing each other,

the first inner wall is disposed closer to the folding line than the second inner wall, and

a first interval between the optical element and the first inner wall is greater than a second interval between the optical element and the second inner wall.

6. The display device of claim 5 , wherein the display device is in-folded with respect to the folding line.

7. The display device of claim 1 , further comprising an anti-reflection member disposed on a first surface of the display panel,

wherein the through hole further penetrates the anti-reflection member in the thickness direction.

8. The display device of claim 7 , further comprising a polymer film layer disposed on a second surface of the display panel opposite the first surface,

wherein the through hole further penetrates the polymer film layer in the thickness direction.

9. The display device of claim 8 , wherein in a folded state, an inner wall of the through hole is inclined with respect to the thickness direction.

10. The display device of claim 7 , further comprising:

a cover window disposed above the display panel, and covering the through hole in the plan view; and

a cover window protection layer disposed on the cover window.

11. The display device of claim 1 , further comprising a heat dissipation member disposed below the display panel, and including a lower through hole which penetrates the heat dissipation member in the thickness direction,

wherein the lower through hole overlaps the through hole in the plan view.

12. The display device of claim 11 , wherein in the plan view, the lower through hole surrounds the through hole, and has a circular shape.

13. A display device including a folding line extending in a first direction and a hole area disposed on a first side of the folding line, the display device comprising:

a display panel;

a cover window disposed on the display panel; and

a printed layer disposed on the cover window,

wherein the hole area includes:

a through hole which penetrates the display panel in a thickness direction; and

an optical hole defined by the printed layer, the optical hole overlapping the through hole in a plan view, and

wherein in the plan view, a first maximum width of the optical hole in the first direction is smaller than a second maximum width of the optical hole in a second direction perpendicular to the first direction,

wherein in the plan view a fourth maximum width of the through hole in the second direction is in a range of about 1.05 to about 1.2 times a third maximum width or the through hole in the first direction.

14. The display device of claim 13 , further comprising an optical element disposed to overlap the optical hole in the plan view, and including a light receiving portion.

15. The display device of claim 14 , wherein in a folded state, the optical hole overlaps the optical element, and the printed layer surrounds the optical element.

16. The display device of claim 15 , wherein the optical hole has an elliptical shape in the plan view.

17. The display device of claim 13 , wherein the fourth maximum width of the through hole is in a range of about 3 to about 4 mm, and the third maximum width of the through hole is in a range of about 2.7 to about 3.8 mm.

18. A foldable display device including a display panel, the display device comprising:

a folding line extending in a first direction;

a first non-folding area disposed on a first side of the folding line and which extends in a second direction perpendicular to the first direction;

a second non-folding area disposed on a second side of the folding line opposite the first side and which extends in the second direction;

a through hole defined in the first non-folding area and which penetrates the display panel in a thickness direction, and

an optical element disposed to overlap an inside of the through hole in a plan view,

wherein the through hole includes a first inner wall and a second inner wall facing each other,

the first inner wall is disposed closer to the folding line than the second inner wall, and

a first interval between the optical element and the first inner wall is greater than a second interval between the optical element and the second inner wall.