Display device
A display device is provided. A display device including folding areas, the display device includes a display panel, a first protection member disposed on the display panel, a second protection member disposed on the first protection member, a first adhesive member disposed between the display panel and the first protection member, and a second adhesive member disposed between the first protection member and the second protection member and having an elastic modulus equal to or smaller than an elastic modulus of the first adhesive member.
1 . A display device comprising folding areas, the display device comprising:
a display panel;
a first protection member disposed on the display panel;
a second protection member disposed on the first protection member;
a first adhesive member disposed between the display panel and the first protection member; and
a second adhesive member disposed between the first protection member and the second protection member and having an elastic modulus smaller than an elastic modulus of the first adhesive member,
wherein a thickness of the first adhesive member is smaller than a thickness of the second adhesive member of which modulus is smaller than the modulus of the first adhesive member.
2 . The display device of claim 1 ,
wherein the elastic modulus of the first adhesive member and the elastic modulus of the second adhesive member are measured by dynamic mechanical analysis.
3 . The display device of claim 2 ,
wherein the elastic modulus of the first adhesive member is greater than 0 kPa and less than 150 kPa at −20° C., and
wherein the elastic modulus of the second adhesive member is greater than 0 kPa and less than 100 kPa at −20° C.
4 . The display device of claim 1 ,
wherein the first protection member has a first thickness, and
wherein the second protection member has a second thickness different from the first thickness.
5 . The display device of claim 1 ,
wherein the folding areas may include a first folding area extended in a first direction and a second folding area extended in the first direction,
wherein the first folding area and the second folding area are separated from each other in a second direction different from the first direction, and
wherein the display device is folded inward along on the first folding area and folded outward along on the second folding area.
6 . The display device of claim 5 , further comprising:
a first non-folding area disposed at one side of the first folding area in the second direction;
a second non-folding area disposed between the first folding area and the second folding area; and
a third non-folding area disposed at an opposite side of the second folding area in the second direction.
7 . The display device of claim 6 , further comprising:
a display area for displaying images; and
a non-display area disposed outside the display area,
wherein the display area and the non-display area are disposed across the first folding area, the second folding area, the first non-folding area, the second non-folding area and the third non-folding area.
8 . The display device of claim 7 , further comprising a first heat dissipation member and a second heat dissipation member under the display panel,
wherein the first heat dissipation member is disposed at the first non-folding area and the second heat dissipation member is disposed at the second non-folding area and is separated from the first heat dissipation member.
9 . The display device of claim 1 ,
wherein a storage modulus of the second protection member increases with a frequency of an external impact applied to the second protection member.
10 . The display device of claim 9 ,
wherein the storage modulus of the second protection member according to the frequency increases more when the frequency of the second protection member is greater than 1 Hz than when the frequency of the second protection member is less than 1 Hz.
11 . The display device of claim 10 ,
wherein the storage modulus of the second protection member is in a range of from 6 GPa to 1,000 GPa when the frequency is 1 Hz, and is in a range of from 8 GPa to 1,000 GPa when the frequency is 30,000 Hz, and
wherein the storage modulus of the second protection member is measured by dynamic mechanical analysis (DMA).
12 . The display device of claim 9 ,
wherein the second protection member includes at least one selected from the group consisting of: polyethylene terephthalate (PET), tri-acetyl cellulose (TAC), transparent polyimide and aramid.
13 . The display device of claim 1 ,
wherein a storage modulus of the first protection member lies in a range of from 1,000 MPa to 2,000 MPa at −20° C. and in a range of from 100 MPa to 2,000 MPa at 85° C.
14 . A display device comprising a first folding area and a second folding area spaced apart from each other and extended in a first direction, the display device comprising:
a display panel;
a first protection member disposed on the display panel;
a second protection member disposed on the first protection member and having a storage modulus increasing with a frequency of an external impact applied to the second protection member;
a first adhesive member disposed between the display panel and the first protection member; and
a second adhesive member disposed between the first protection member and the second protection member,
wherein the display device is folded inward along the first folding area and folded outward along the second folding area,
wherein an elastic modulus of the second adhesive member is smaller than an elastic modulus of the first adhesive member,
and
wherein a thickness of the first adhesive member is greater than a thickness of the second adhesive member of which modulus is smaller than the modulus of the first adhesive member.
15 . The display device of claim 14 ,
wherein the storage modulus of the second protection member according to the frequency increases more when the frequency of the second protection member is greater than 1 Hz than when the frequency of the second protection member is less than 1 Hz.
16 . The display device of claim 15 ,
wherein the storage modulus of the second protection member is in a range of from 6 GPa to 1,000 GPa when the frequency is 1 Hz, and is in a range of from 8 GPa to 1,000 GPa when the frequency is 30,000 Hz, and
wherein the storage modulus of the second protection member is measured by dynamic mechanical analysis (DMA).
17 . The display device of claim 14 ,
wherein the second protection member includes at least one selected from the group consisting of: polyethylene terephthalate (PET), tri-acetyl cellulous (TAC), transparent polyimide and aramid.
18 . The display device of claim 14 ,
wherein the storage modulus of the first protection member lies in a range of from 1,000 MPa to 2,000 MPa at −20° C. and in a range of from 100 MPa to 2,000 MPa at 85° C.
19 . A display device comprising a first folding area and a second folding area spaced apart from each other and extended in a first direction, the display device comprising:
a display panel;
a first protection member disposed on the display panel;
a second protection member disposed on the first protection member;
a first adhesive member disposed between the display panel and the first protection member; and
a second adhesive member disposed between the first protection member and the second protection member,
wherein a storage modulus of the first protection member lies in a range of from 1,000 MPa to 2,000 MPa at −20° C., and in a range of from 100 MPa to 2,000 MPa at 85° C.,
wherein an elastic modulus of the second adhesive member is smaller than an elastic modulus of the first adhesive member,
and
wherein a thickness of the first adhesive member is greater than a thickness of the second adhesive member of which modulus is smaller than the modulus of the first adhesive member.