Display protector
A display protector includes a transparent base layer having a first surface and a second surface opposite to the first surface; a first stress relief adhesive layer on the first surface of the transparent base layer; a second stress relief adhesive layer on the second surface of the transparent base layer; and an ultra-thin glass (UTG) layer on the first stress relief adhesive layer, wherein a storage modulus of the first stress relief adhesive layer is about 0.03 MPa to about 0.2 MPa at −10° C.
1. A display protector comprising:
a transparent base layer having a first surface and a second surface opposite to the first surface;
a first stress relief adhesive layer directly on the first surface of the transparent base layer;
a second stress relief adhesive layer directly on the second surface of the transparent base layer; and
an ultra-thin glass (UTG) layer on the first stress relief adhesive layer,
wherein a storage modulus of the first stress relief adhesive layer is about 0.03 MPa to about 0.2 MPa at −10° C.
2. The display protector of claim 1 , wherein
each of the first stress relief adhesive layer and the second stress relief adhesive layer has an adhesive strength of about 600 gf/in to about 1,500 gf/in.
3. The display protector of claim 1 , wherein
the storage modulus of the first stress relief adhesive layer is about 0.02 MPa to about 0.2 MPa at +40° C.
4. The display protector of claim 1 , wherein
a storage modulus of the second stress relief adhesive layer is about 0.03MPa to about 0.2 MPa at −10° C.
5. The display protector of claim 1 , wherein
a storage modulus of the second stress relief adhesive layer is about 0.02 MPa to about 0.2 MPa at +40° C.
6. The display protector of claim 1 , further comprising
a scattering prevention coating layer on the UTG layer.
7. The display protector of claim 1 , wherein
the UTG layer has a thickness of about 30 micrometers (μm) to about 70 μm, and is tempered not to be damaged when folded at a radius of curvature of 1.0 mm.
8. The display protector of claim 1 , wherein
the storage modulus of the first stress relief adhesive layer is less than or substantially equal to a storage modulus of the second stress relief adhesive layer.
9. The display protector of claim 1 ,
wherein each of the first stress relief adhesive layer and the second stress relief adhesive layer has an adhesive strength of about 600 gf/in to about 1,500 gf/in with respect to the transparent base layer and with respect to a foldable or rollable display to which the first stress relief adhesive layer and the second stress relief adhesive layer are attached.
10. The display protector of claim 9 , wherein
a storage modulus of each of the first stress relief adhesive layer and the second stress relief adhesive layer is about 0.03 MPa to about 0.18 MPa at −10° C.
11. The display protector of claim 9 , wherein
a storage modulus of each of the first stress relief adhesive layer and the second stress relief adhesive layer is about 0.02 MPa to about 0.18 MPa at +40° C.
12. The display protector of claim 9 , further comprising
a scattering prevention coating layer on the UTG layer and a thickness of the UTG layer is about 30 μm to about 70 μm.
13. The display protector of claim 1 , wherein the UTG layer comprises:
a first glass edge and a second glass edge each extending in a first direction and positioned opposite to each other; and
a third glass edge and a fourth glass edge each extending in a second direction perpendicular to the first direction and positioned opposite to each other;
wherein the transparent base layer, the first stress relief adhesive layer, and the second stress relief adhesive layer include a common outer edge, wherein the common outer edge comprises:
a first film edge and a second film edge respectively extending parallel to the first glass edge and the second glass edge; and
a third film edge and a fourth film edge respectively corresponding to the third glass edge and the fourth glass edge,
wherein the first film edge and the second film edge are respectively offset inwardly from the first glass edge and the second glass edge.
14. The display protector of claim 13 , wherein
the display protector is configured to be foldable with respect to a folding axis parallel to the first glass edge and the second glass edge.
15. The display protector of claim 14 , wherein
the third film edge is at least partially offset outwardly from the third glass edge,
the fourth film edge is at least partially offset outwardly from the fourth glass edge, or
the third film edge and the fourth film edge are at least partially offset outwardly from the third glass edge and the fourth glass edge, respectively.
16. The display protector of claim 15 , wherein
the third film edge and the fourth film edge are at least partially offset outwardly from the third glass edge and the fourth glass edge, respectively.
17. The display protector of claim 15 , wherein
the third film edge comprises:
a first film sub-edge portion intersecting the folding axis and offset outwardly from the third glass edge;
a first corner edge portion forming an end portion of the third film edge and meeting the first film edge; and
a second film sub-edge portion connecting the first film sub-edge portion to the first corner edge portion,
the first corner edge portion is offset inwardly from a corresponding corner edge of the UTG layer.
18. The display protector of claim 17 , wherein
the second film sub-edge portion comprises a portion offset outwardly from the third glass edge, and a dimension by which the second film sub-edge portion is offset outwardly gradually decreases as a distance from the first corner edge portion decreases.
19. The display protector of claim 17 , wherein
the first film sub-edge portion is offset by at least 20 micrometers (μm) outwardly from the third glass edge, and
the second film sub-edge portion is offset inwardly from a corresponding portion than the third glass edge with respect to 80% or more of a length of the second film sub-edge portion.
20. The display protector of claim 17 , wherein
a dimension by which the first film sub-edge portion is offset outwardly from the third glass edge on the folding axis is about 50 μm to about 400 μm.