Display device having a low refractive index layer and a high refractive index layer
A display device includes a substrate. A first electrode is disposed on the substrate. A pixel definition layer is disposed on the substrate. A second electrode is disposed on the first electrode and the pixel definition layer. An organic emission layer is disposed between the first electrode and the second electrode. A planarization layer is disposed on the second electrode. A low refractive index layer is disposed on the planarization layer and overlaps the pixel definition layer. A high refractive index layer is disposed on the planarization layer and overlaps the second electrode. The high refractive index layer has a higher refractive index than that of the low refractive index layer.
1. A display device comprising:
a substrate;
a first electrode disposed on the substrate;
a pixel definition layer disposed on the substrate;
a second electrode disposed on the first electrode and the pixel definition layer;
an organic emission layer disposed between the first electrode and the second electrode;
a planarization layer disposed on the second electrode;
a low refractive index layer disposed on the planarization layer and overlapping the pixel definition layer; and
a high refractive index layer disposed on the planarization layer and overlapping the second electrode,
wherein the high refractive index layer has a higher refractive index than that of the low refractive index layer,
wherein the low refractive index layer has a tapered shape, and
wherein a taper angle θ of the low refractive index layer satisfies a following equation:
asind
(
n
1
n
2
)
≤
θ
<
90
°
,
wherein n1 is a refractive index of the low refractive index layer, n2 is a refractive index of the high refractive index layer, and asind (x) represents an angle in degrees.
2. The display device of claim 1 , wherein the high refractive index layer contacts the low refractive index layer.
3. The display device of claim 2 , wherein the high refractive index layer at least partially covers the low refractive index layer.
4. The display device of claim 3 , wherein a top surface of the high refractive index layer is substantially planar.
5. The display device of claim 1 , wherein a thickness of the low refractive index layer is 4 μm or more and 8 μm or less.
6. The display device of claim 5 , wherein the thickness of the low refractive index layer is substantially 5 μm.
7. The display device of claim 1 , wherein an emission region is separated from the low refractive index layer.
8. The display device of claim 7 , wherein a horizontal distance between the emission region and the low refractive index layer is 0.5 μm or more and 3 μm or less.
9. The display device of claim 8 , wherein the horizontal distance between the emission region and the low refractive index layer is substantially 1.5 μm.
10. The display device of claim 1 , wherein a thickness of the planarization layer is 4 μm or more and 10 μm or less.
11. The display device of claim 1 , wherein a refractive index of the planarization layer is greater than that of the low refractive index layer, and is smaller than that of the high refractive index layer.
12. The display device of claim 1 , wherein the substrate includes a plurality of pixels, and
each of the plurality of pixels are arranged in an orthogonal matrix form or a pentile matrix form.
13. The display device of claim 12 , wherein an emission region of each of the plurality of pixels has a circular shape.
14. The display device of claim 12 , wherein an emission region of each of the plurality of pixels has a polygonal shape.
15. The display device of claim 1 , further comprising a first buffer layer disposed between the second electrode and the planarization layer.
16. The display device of claim 1 , further comprising a polarizer disposed on the high refractive index layer.
17. The display device of claim 1 , further comprising a cover window disposed on the high refractive index layer.
18. The display device of claim 1 , further comprising
a light blocking member disposed on the low refractive index layer.
19. The display device of claim 1 , wherein the high refractive index layer includes a color filter.
20. A display device comprising:
a substrate;
a first electrode disposed on the substrate;
a pixel definition layer disposed on the substrate;
a second electrode disposed on the first electrode and the pixel definition layer;
an organic emission layer disposed between the first electrode and the second electrode;
a planarization layer disposed on the second electrode;
a low refractive index layer disposed on the planarization layer and overlapping the pixel definition layer;
a high refractive index layer disposed on the planarization layer and overlapping the second electrode; and
a second buffer layer disposed between the planarization layer and the low refractive index layer, and between the planarization layer and the high refractive index layer,
wherein the high refractive index layer has a higher refractive index than that of the low refractive index layer.
21. The display device of claim 20 , wherein the high refractive index layer contacts the low refractive index layer.
22. The display device of claim 21 , wherein the high refractive index layer at least partially covers the low refractive index layer.
23. The display device of claim 22 , wherein a top surface of the high refractive index layer is substantially planar.
24. The display device of claim 20 , wherein a thickness of the low refractive index layer is 4 μm or more and 8 μm or less.
25. The display device of claim 24 , wherein the thickness of the low refractive index layer is substantially 5 μm.
26. The display device of claim 20 , wherein an emission region is separated from the low refractive index layer.
27. The display device of claim 26 , wherein a horizontal distance between, the emission region and the low refractive index layer is 0.5 μm or more and 3 μm or less.
28. The display device of claim 27 , wherein the horizontal distance between the emission region and the low refractive index layer is substantially 1.5 μm.
29. The display device of claim 20 , wherein a thickness of the planarization layer is 4 μm or more and 10 μm or less.
30. The display device of claim 20 , wherein a refractive index of the planarization layer is greater than that of the low refractive index layer, and is smaller than that of the high refractive index layer.
31. The display device of claim 20 , wherein the substrate includes a plurality of pixels, and
each of the plurality of pixels are arranged in an orthogonal matrix form or a pentile matrix form.
32. The display device of claim 31 , wherein an emission region of each of the plurality of pixels has a circular shape.
33. The display device of claim 31 , wherein an emission region of each of the plurality of pixels has a polygonal shape.
34. The display device of claim 20 , further comprising a first buffer layer disposed between the second electrode and the planarization layer.
35. The display device of claim 20 , further comprising a polarizer disposed on the high refractive index layer.
36. The display device of claim 20 , further comprising a cover window disposed on the high refractive index layer.
37. The display device of claim 20 , further comprising
a light blocking member disposed on the low refractive index layer.
38. The display device of claim 20 , wherein the high refractive index layer includes a color filter.