Plastic window and organic light-emitting display apparatus including the same

1. A plastic window, comprising:

a first layer;

a second layer stacked on the first layer; and

hard coating layers on an outer bottom surface of the first layer and on an outer top surface of the second layer, respectively, the outer top surface of the second layer facing a direction opposite to that of the outer bottom surface of the first layer,

wherein:

the first layer and the second layer each include polyethylene terephthalate, and

the first layer has the same thickness as the second layer.

2. The plastic window as claimed in claim 1 , further comprising a third layer between the first layer and the second layer, the plastic window having a vertically symmetric structure with respect to a plane of symmetry that extends along a center of the third layer.

3. The plastic window as claimed in claim 2 , wherein the third layer includes polyethylene terephthalate.

4. The plastic window as claimed in claim 2 , wherein the third layer includes polycarbonate.

5. The plastic window as claimed in claim 1 , wherein the first layer is adhered to the second layer with a first optical clear adhesive.

6. The plastic window as claimed in claim 2 , wherein:

the first layer is adhered to the third layer with a second optical clear adhesive, and

the second layer is adhered to the third layer with the second optical clear adhesive.

7. The plastic window as claimed in claim 1 , wherein the plastic window has a vertically symmetric structure with respect to a plane of symmetry that passes between the first layer and the second layer.

8. An organic light-emitting display apparatus, comprising:

a display unit;

a touch panel on the display unit; and

a plastic window attached onto the touch panel,

wherein the plastic window includes:

a first layer on the touch panel; and

a second layer stacked on the first layer, and

wherein:

the first layer and the second layer each include polyethylene terephthalate,

the first layer has the same thickness as the second layer, and

the plastic window further includes hard coating layers on a bottom surface of the first layer and a top surface of the second layer, respectively, the top surface of the second layer facing an opposite direction relative to that of the bottom surface of the first layer.

9. The organic light-emitting display apparatus as claimed in claim 8 , wherein a difference in thermal expansion coefficients between the touch panel and the plastic window is less than or equal to 20 ppm.

10. The organic light-emitting display apparatus as claimed in claim 8 , wherein the plastic window further includes a third layer between the first layer and the second layer, the plastic window having a vertically symmetric structure with respect to a plane of symmetry that extends along a center of the third layer.

11. The organic light-emitting display apparatus as claimed in claim 10 , wherein the third layer includes polyethylene terephthalate.

12. The organic light-emitting display apparatus as claimed in claim 10 , wherein the third layer includes polycarbonate.

13. The organic light-emitting display apparatus as claimed in claim 8 , further comprising an encapsulating layer on the display unit, wherein:

the display unit includes an organic light-emitting device, and

the encapsulating layer seals the display unit.

14. The organic light-emitting display apparatus as claimed in claim 13 , wherein the touch panel is directly on the encapsulating layer.

15. The organic light-emitting display apparatus as claimed in claim 13 , further comprising a polarizer between the encapsulating layer and the touch panel.

16. The organic light-emitting display apparatus as claimed in claim 8 , wherein the plastic window has a vertically symmetric structure with respect to a plane of symmetry that passes between the first layer and the second layer.