Display device and window module
A display device includes a display module folded with respect to a folding axis extending in a direction and a window disposed on the display module and including a folding portion and a non-folding portion, the folding portion being folded with respect to the folding axis. The folding portion includes a first folding surface adjacent to the display module and a second folding surface opposite to the first folding surface and spaced apart from the first folding surface. Multiple first grooves may be defined in the first folding surface, multiple second grooves may be defined in the second folding surface, and a ratio of a Young's modulus of the folding portion to a Young's modulus of the non-folding portion may be in a range of about 30/70000 to about 2000/70000.
1 . A display device comprising:
a display module folded with respect to a folding axis that extends in a first direction; and
a window disposed on the display module and comprising a folding portion and a non-folding portion, the folding portion comprising:
a first folding surface adjacent to the display module, the first folding surface including a plurality of first grooves defined therein; and
a second folding surface opposite to the first folding surface and spaced apart from the first folding surface by a thickness of the window, the second folding surface including a plurality of second grooves defined therein, wherein
the folding portion folds with respect to the folding axis,
and
a ratio of a Young's modulus of the folding portion to a Young's modulus of the non-folding portion is in a range of 30/70000 to 2000/70000.
2 . The display device of claim 1 , wherein
the thickness of the window is in a range of 100 μm to 175 μm, and
a radius of curvature with respect to the folding axis is in a range of 1.0 mm to 2.0 mm.
3 . The display device of claim 2 , wherein the thickness of the window is 100 μm.
4 . The display device of claim 2 , wherein
the thickness of the window is 125 μm,
the radius of curvature is in a range of 1.0 mm to 1.5 mm, and
the ratio of the Young's modulus of the folding portion to the Young's modulus of the non-folding portion is in a range of 50/70000 to 2000/70000.
5 . The display device of claim 2 , wherein
the ratio of the Young's modulus of the folding portion to the Young's modulus of the non-folding portion is in a range of 75/70000 to 2000/70000; and
either
the thickness of the window is 150 μm and the radius of curvature is 1.0 mm, or
the thickness of the window is 125 μm and the radius of curvature is 2.0 mm.
6 . The display device of claim 2 , wherein
the ratio of the Young's modulus of the folding portion to the Young's modulus of the non-folding portion is in a range of 100/70000 to 2000/70000; and
either
the thickness of the window is 175 μm and the radius of curvature is 1.0 mm, or
the thickness of the window is in a range of 150 μm to 175 μm and the radius of curvature is in a range of 1.5 mm to 2.0 mm.
7 . The display device of claim 1 , wherein the Young's modulus of the non-folding portion is in a range of 65 GPa to 75 GPa.
8 . The display device of claim 1 , wherein the plurality of first grooves and the plurality of second grooves are disposed in an alternating manner in a second direction intersecting the first direction in a plan view.
9 . The display device of claim 1 , wherein
the window comprises a plurality of first folding intermediate portions and a plurality of second folding intermediate portions,
the plurality of first folding intermediate portions overlap the plurality of first grooves respectively in a plan view,
the plurality of second folding intermediate portions overlap the plurality of second grooves respectively in a plan view, and
a thickness of each of the plurality of first folding intermediate portions and each of the plurality of second folding intermediate portions is in a range of 35 μm to 40 μm.
10 . The display device of claim 9 , wherein the thickness of each of the plurality of first folding intermediate portions and the thickness of each of the plurality of second folding intermediate portions are substantially equal to each other.
11 . The display device of claim 1 , wherein a width in a second direction intersecting the first direction of each of the plurality of first grooves and each of the plurality of second grooves is in a range of 80 μm to 100 μm.
12 . The display device of claim 1 , wherein a width of a sidewall portion of the folding portion disposed between one of the plurality of first grooves and an adjoining one of the plurality of second grooves is in a range of 25 μm to 35 μm.
13 . The display device of claim 1 , wherein each of a distance between two of the plurality of first grooves that are adjacent to each other and a distance between two of the plurality of second grooves that are adjacent to each other is in a range of 120 μm to 150 μm.
14 . The display device of claim 1 , further comprising:
a protective film disposed on the window.
15 . The display device of claim 1 , wherein the window comprises a glass material.
16 . The display device of claim 1 , wherein the plurality of first grooves and the plurality of second grooves do not overlap the non-folding portion in a plan view.
17 . A window module comprising:
a window comprising a folding portion and a non-folding portion; and
a protective film disposed on the window, the folding portion comprising:
a first folding surface including a plurality of first grooves defined therein; and
a second folding surface including a plurality of second grooves defined therein, the second folding surface is opposite to the first folding surface and is spaced apart from the first folding surface by a thickness of the window, wherein
the folding portion folds with respect to a folding axis that extends in a first direction,
a ratio of a Young's modulus of the folding portion to a Young's modulus of the non-folding portion is in a range of 30/70000 to 2000/70000, and
a shortest distance between the folding axis and an upper surface of the protective film is in a range of 1.0 mm to 2.0 mm.
18 . The window module of claim 17 , further comprising:
an adhesive layer disposed between the window and the protective film.
19 . The window module of claim 17 , wherein the plurality of first grooves and the plurality of second grooves are disposed in an alternating manner in a second direction intersecting the first direction in a plan view.
20 . The window module of claim 17 , wherein the plurality of first grooves and the plurality of second grooves do not overlap the non-folding portion in a plan view.
21 . An electronic device comprising:
a display module folded with respect to a folding axis that extends in a first direction; and
a window disposed on the display module and comprising a folding portion and a non-folding portion, the folding portion comprising:
a first folding surface adjacent to the display module, the first folding surface including a plurality of first grooves defined therein; and
a second folding surface opposite to the first folding surface and spaced apart from the first folding surface by a thickness of the window, the second folding surface including a plurality of second grooves defined therein,
wherein the folding portion folds with respect to the folding axis, and
wherein a ratio of a Young's modulus of the folding portion to a Young's modulus of the non-folding portion is in a range of 30/70000 to 2000/70000.