Display device and carrier film
A display device includes a display panel, a panel protective film disposed below the display panel, and a first adhesive layer disposed between the display panel and the panel protective film, where a test speed of a tensile test of the panel protective film is about 5 millimeters per minute (mm/min), Young's modulus of the panel protective film is measured in a range of strain in which strain of the panel protective film is about 0.05 percent (%) to about 0.5%, and the panel protective film has the Young's modulus of about 4324 megapascals (MPa) to about 4792 MPa at about 25 degrees Celsius.
1. A display device comprising:
a display panel;
a panel protective film disposed below the display panel; and
a first adhesive layer disposed between the display panel and the panel protective film,
wherein under a setting in which a test speed of a tensile test of the panel protective film is 5 millimeters per minute, and Young's modulus of the panel protective film is measured in a range of strain in which strain of the panel protective film is 0.05 percent to 0.5 percent, the panel protective film has the Young's modulus of 4324 megapascals to 4792 megapascals at 25 degrees Celsius, and has the Young's modulus of 3646 megapascals to 3924 megapascals at 85 degrees Celsius so that a deformation in a folding area of the display device is reduced,
wherein, at 210 degrees Celsius, stress of a yielding point of the panel protective film is 29.97 megapascals to 31.34 megapascals, and strain of the yielding point of the panel protective film is 1.19 percent to 1.26 percent.
2. The display device of claim 1 , wherein, at 25 degrees Celsius, the stress of the yielding point of the panel protective film is 59.49 megapascals to 68.13 megapascals, and the strain of the yielding point of the panel protective film is 1.47 percent to 1.54 percent.
3. The display device of claim 1 , wherein, at 85 degrees Celsius, the stress of the yielding point of the panel protective film is 46.56 megapascals to 51.58 megapascals, and the strain of the yielding point of the panel protective film is 1.29 percent to 1.49 percent.
4. The display device of claim 1 , wherein the panel protective film has a storage modulus of 2391 megapascals to 2419 megapascals at 25 degrees Celsius when a vibration having an amplitude of 10 micrometers and a frequency of 1 Hertz is applied to the panel protective film and a force track is set to 125 percent.
5. The display device of claim 4 , wherein the panel protective film has the storage modulus of 2181 megapascals to 2237 megapascals at 60 degrees Celsius.
6. The display device of claim 1 , wherein the first adhesive layer has, at 25 degrees Celsius, a storage modulus of 0.0560 megapascals to 0.0612 megapascals, a loss modulus of 0.0210 megapascals to 0.0232 megapascals, and a tan delta value of 0.3741 to 0.3796 when a frequency of 1 Hertz and an axial force of 1.0 Newton are applied to the first adhesive layer and strain of the first adhesive layer is maintained at 1 percent.
7. The display device of claim 6 , wherein the first adhesive layer has, at 70 degrees Celsius, the storage modulus of 0.0253 megapascals to 0.0297 megapascals, the loss modulus of 0.0101 megapascals to 0.0123 megapascals, and the tan delta value of 0.3970 to 0.4151.
8. The display device of claim 6 , wherein the first adhesive layer has, at 210 degrees Celsius, the storage modulus of 0.0179 megapascals to 0.0196 megapascals, the loss modulus of 0.0038 megapascals to 0.0044 megapascals, and the tan delta value of 0.2135 to 0.2238.
9. The display device of claim 1 , wherein the panel protective film comprises at least one of polyimide, polyamide, aramid, polyethylene naphthalene, and polyethylene terephthalate.
10. The display device of claim 1 , wherein the first adhesive layer comprises an acrylic resin.
11. The display device of claim 1 , wherein the panel protective film has a thickness of 10 micrometers to 50 micrometers, and the first adhesive layer has a thickness of 5 micrometers to 18 micrometers.