Display device
A display device according to an embodiment includes: a display panel; a window on a side of the display panel; a protection member on another side of the display panel; an upper adhesive layer between the display panel and the window; and a lower adhesive layer between the display panel and the protection member, and the lower adhesive layer has a Tan δ value of 1.7 to 2.5 at 30,000 Hz to 100,000 Hz and 25° C.
1 . A display device comprising:
a display panel;
a window on a side of the display panel;
a support member on another side of the display panel;
an upper adhesive layer between the display panel and the window; and
a lower adhesive layer between the display panel and the support member,
wherein the lower adhesive layer is a pressure sensitive adhesive and comprises an acryl resin cured by light having a wavelength of 200 nm to 400 nm or an acryl resin cured by heat of 120° C. to 140° C.,
wherein, as measured at a moment an impact is applied through a pen drop test, the lower adhesive layer has a Tan δ value of 1.7 to 2.5 at 30,000 Hz to 100,000 Hz and 25° C., and the Tan δ value of the lower adhesive layer at 30,000 Hz to 100,000 Hz and 25° C. is greater than that of the upper adhesive layer at 30,000 Hz to 100,000 Hz and 25° C.,
wherein the lower adhesive layer has a shear modulus value of 1 MPa to 5 MPa at 30,000 Hz to 100,000 Hz and 25° C.
2 . The display device of claim 1 , wherein the shear modulus value of the lower adhesive layer at 30,000 Hz to 100,000 Hz and 25° C. is less than that of the upper adhesive layer at 30,000 Hz to 100,000 Hz and 25° C.
3 . The display device of claim 1 , wherein a storage modulus of the lower adhesive layer is less than 0.3 MPa at 1 Hz and −25° C.
4 . The display device of claim 1 , wherein a storage modulus of the lower adhesive layer is less than 0.05 MPa at 1 Hz and 25° C.
5 . The display device of claim 1 , further comprising:
a protection member between the window and the display panel; and
a window protection member on the window,
wherein the upper adhesive layer comprises:
a first adhesive layer between the window and the window protection member;
a second adhesive layer between the window and the protection member; and
a third adhesive layer between the protection member and the display panel.
6 . The display device of claim 1 , wherein
the support member comprises a first support member, a second support member, and a third support member, and
the lower adhesive layer comprises:
a fourth adhesive layer between the display panel and the first support member;
a fifth adhesive layer between the first support member and the second support member; and
a sixth adhesive layer between the second support member and the third support member.
7 . The display device of claim 6 , wherein a thickness of each of the fourth adhesive layer to the sixth adhesive layer is less than 20 μm.
8 . The display device of claim 6 , wherein
the first support member and the second support member comprise a polymer resin, and
the third support member contains at least one of glass, plastic, and a metal.
9 . The display device of claim 8 , wherein
the third support member comprises a folding portion, and
the folding portion comprises any of a pattern portion with an opening, protrusions and depressions, and links connected to be rotatable with each other.
10 . The display device of claim 1 , wherein the display device is a foldable display device.
11 . A display device comprising:
a display panel;
a window on a side of the display panel;
a support member on another side of the display panel;
an upper adhesive layer between the display panel and the window; and
a lower adhesive layer between the display panel and the support member,
wherein the lower adhesive layer is a pressure sensitive adhesive and comprises an acryl resin cured by light having a wavelength of 200 nm to 400 nm or an acryl resin cured by heat of 120° C. to 140° C.,
wherein, as measured at a moment an impact is applied through a pen drop test, the lower adhesive layer has a shear modulus value of 1 MPa to 5 MPa at 30,000 Hz to 100,000 Hz and 25° C., and the shear modulus value of the lower adhesive layer at 30,000 Hz to 100,000 Hz and 25° C. is less than that of the upper adhesive layer at 30,000 Hz to 100,000 Hz and 25° C.,
wherein a Tan δ value of the lower adhesive layer at 30,000 Hz to 100,000 Hz and 25° C. is greater than that of the upper adhesive layer at 30,000 Hz to 100,000 Hz and 25° C.
12 . The display device of claim 11 , wherein a storage modulus of the lower adhesive layer at 1 Hz and −25° C. is less than 0.3 MPa.
13 . The display device of claim 11 , wherein a storage modulus of the lower adhesive layer at 1 Hz and 25° C. is less than 0.05 MPa.
14 . The display device of claim 11 , wherein
the lower adhesive layer comprises a fourth adhesive layer, a fifth adhesive layer, and a sixth adhesive layer, which are separated from each other, and
a thickness of each of the fourth adhesive layer, the fifth adhesive layer, and the sixth adhesive layer is less than 20 μm.