Cover window for display device and display device including the same
A cover window for a display device includes: a first film; a second film on the first film; and an adhesive layer between the first film and the second film. The adhesive layer has a lap shear modulus in a range of 20 kPa to 50 kPa.
1. A display device comprising:
a display panel;
a cover window on the display panel, the cover window comprising:
a first film;
a second film on the first film; and
an adhesive layer between the first film and the second film and comprising an elastic polymer, the adhesive layer having a lap shear modulus in a range of 20 kPa to 50 kPa; and
a coating layer on the cover window.
2. The display device of claim 1 , wherein the adhesive layer has a storage modulus in a range of 100 kPa to 10 MPa.
3. The display device of claim 2 , wherein the adhesive layer has a loss modulus in a range of 100 kPa to 10 MPa.
4. The display device of claim 3 , wherein a ratio of the loss modulus to the storage modulus of the adhesive layer is in a range of 0.01 to 100.
5. The display device of claim 4 , wherein the adhesive layer has an adherence in a range of 500 gf to 3000 gf.
6. The display device of claim 5 , wherein the adhesive layer has a thickness in a range of 1 μm to 50 μm.
7. The display device of claim 6 , wherein the adhesive layer has a thickness in a range of 20 μm to 30 μm.
8. The display device of claim 7 , wherein the cover window has a thickness in a range of 1 μm to 500 μm.
9. The display device of claim 1 , further comprising:
a third film on the second film; and
a second adhesive layer between the second film and the third film.
10. The display device of claim 1 , wherein the adhesive layer has a modulus of elasticity that gradually varies along a thickness direction thereof.
11. A cover window for a display device comprising:
a first film;
a second film on the first film; and
an adhesive layer between the first film and the second film, the adhesive layer having a lap shear modulus in a range of 20 kPa to 50 kPa.
12. The cover window for the display device of claim 11 , wherein the adhesive layer has a storage modulus in a range of 100 kPa to 10 MPa.
13. The cover window for the display device of claim 12 , wherein the adhesive layer has a loss modulus in a range of 100 kPa to 10 MPa.
14. The cover window for the display device of claim 13 , wherein a ratio of the loss modulus to the storage modulus of the adhesive layer is in a range of 0.01 to 100.
15. The cover window for the display device of claim 14 , wherein the adhesive layer has an adherence in a range of 500 gf to 3000 gf.
16. The cover window for the display device of claim 15 , wherein the adhesive layer has a thickness in a range of 1 μm to 50 μm.
17. The cover window for the display device of claim 16 , wherein the thickness of the adhesive layer is in a range of 20 μm to 30 μm.
18. The cover window for the display device of claim 17 , wherein the cover window has a thickness in a range of 1 μm to 500 μm.
19. The cover window for the display device of claim 11 , further comprising:
a third film on the second film; and
a second adhesive layer between the second film and the third film.
20. The cover window for the display device of claim 11 , wherein the adhesive layer has a modulus of elasticity that gradually varies along a thickness direction thereof.