Display device for preventing separation of black matrix therefrom
An display device includes a cover window including a display area and an attaching area, at least one display panel in the display area of the cover window, a first black matrix in an edge area of the display area and the attaching area, a second black matrix in the attaching area over the first black matrix, and an adhesive on the second black matrix, wherein a first difference of coefficient of thermal expansion between the second black matrix and the adhesive is small than a second difference of coefficient of thermal expansion between the first black matrix and the adhesive.
1. A display device, comprising:
a cover window including a display area and an attaching area;
at least one display panel in the display area of the cover window;
a first black matrix in an edge area of the display area and the attaching area;
a second black matrix in the attaching area over the first black matrix; and
an adhesive on the second black matrix,
wherein a first difference of coefficient of thermal expansion between the second black matrix and the adhesive is smaller than a second difference of coefficient of thermal expansion between the first black matrix and the adhesive.
2. The display device of claim 1 , wherein ends of the first black matrix and the second black matrix are spaced apart from each other by a predetermined distance.
3. The display device of claim 1 , wherein the second black matrix is not disposed in the display area.
4. The display device of claim 1 , further comprising:
an optical adhesive layer configured to attach the at least one display panel to the cover window.
5. The display device of claim 4 , wherein the adhesive is made of a material different from that of the optical adhesive layer.
6. The display device of claim 1 , wherein the at least one display panel includes:
a substrate;
a plurality of light emitting elements disposed on the substrate;
a bank layer defining each of the plurality of light-emitting elements;
a first encapsulation layer made of inorganic material and disposed on the light emitting elements and the bank layer;
a second encapsulation layer made of organic material and disposed on the first encapsulation layer; and
a third encapsulation layer made of inorganic material and disposed on the second encapsulation layer, and
wherein the second encapsulation layer is formed in an island structure on the first encapsulation layer.
7. The display device of claim 6 , wherein a spacer is formed between the plurality of light emitting elements on the bank layer.
8. The display device of claim 1 , wherein the cover window is made of a glass or a polymer material.
9. The display device of claim 1 , wherein the cover window includes a spherical or aspherical surface.
10. The display device of claim 9 , wherein the display panel includes a flexible display panel.
11. The display device of claim 1 , further comprising a back plate attached to the lower surface of the display panel.
12. The display device of claim 1 , wherein the first black matrix is composed of two layers.
13. The display device of claim 12 , wherein ends of the two layers of the first black matrix are spaced apart to each other.
14. The display device of claim 1 , wherein the second black matrix is composed of a single layer.
15. The display device of claim 1 , wherein the second black matrix is composed of multi layers.
16. The display device of claim 15 , wherein ends of the multi layers of the second black matrix are spaced apart to each other.
17. The display device of claim 1 , wherein the adhesive is made of an urethane based material.
18. The display device of claim 17 , wherein the first black matrix is made of a polyester based material and the second black matrix is made of an epoxy based material or an acryl based material.
19. The display device of claim 1 , wherein the first black matrix is formed in a thickness of 8-12 μm and the second black matrix is formed in a thickness of 10 μm or more.