Organic light-emitting display apparatus and method of manufacturing the same
View Patent ↗Provided is an organic light-emitting display device and a method of manufacturing the same. The organic light-emitting display device includes a plurality of pixels; the pixels further include opposing first and second electrodes, and an intermediate layer disposed between the first and second electrodes. The pixels are divided into red, green, and blue sub-pixels. The intermediate layer has a thickness that varies according to the sub-pixels.
1. An organic light-emitting display device comprising:
pixels to emit light in a first direction, comprising a first electrode, a second electrode, and an intermediate layer disposed between the first and second electrodes, wherein,
each pixel is divided into red, green, and blue sub-pixels, the red, green, and blue sub-pixels respectively comprising red, green, and blue emission layers disposed in the intermediate layer, the red, green, and blue emission layers being spaced apart from each other,
the thickness of the intermediate layer varies according to the sub-pixels, and
in each of the pixels, the red sub-pixel is disposed between the green and blue sub-pixels.
2. The device of claim 1 , wherein:
the thickness of the intermediate layer is at a maximum in the red sub-pixel.
3. The device of claim 2 , wherein the sum of the thickness of the intermediate layer in the blue sub-pixel and the thickness of the intermediate layer in the green sub-pixel is substantially equal to the thickness of the intermediate layer in the red sub-pixel.
4. The device of claim 1 , wherein the thickness of the intermediate layer is at a maximum in the red sub-pixels.
5. The device of claim 1 , wherein the sub-pixels of adjacent pixels are symmetrically disposed according to color about a boundary between the adjacent pixels.
6. The device of claim 1 , wherein the intermediate layer comprises:
a hole injection layer disposed on the first electrode, the hole injection layer having a generally constant thickness; and
a hole transport layer disposed on the hole injection layer, the hole injection layer having a thickness that varies according to the sub-pixels.
7. The device of claim 1 , wherein the intermediate layer comprises:
a hole injection layer disposed on the first electrode in each pixel, the hole injection layer having a thickness that varies according to the sub-pixels; and
a hole transport layer disposed on the hole injection layer, the hole transport layer having a generally constant thickness.
8. The device of claim 1 , wherein the intermediate layer comprises:
a hole injection layer having a thickness that varies according to the sub-pixels; and
a hole transport layer formed on the hole injection layer, the hole transport layer having a thickness that varies according to the sub-pixels.
9. The device of claim 1 , wherein the intermediate layer comprises an electron transport layer having a thickness that varies according to the sub-pixels.
10. The device of claim 1 , wherein the green or blue sub-pixels of adjacent pixels are disposed at a boundary between the adjacent pixels.
11. The device of claim 1 , wherein the thickness of the intermediate layer increases from the blue sub-pixel, to the green sub-pixel, to the red sub-pixel.
12. An organic light-emitting display device comprising:
pixels to emit light in a first direction, comprising a first electrode, a second electrode, and an intermediate layer disposed between the first and second electrodes, wherein,
each pixel is divided into red, green, and blue sub-pixels, the red, green, and blue sub-pixels respectively comprising red, green, and blue emission layers disposed in the intermediate layer, the red, green, and blue emission layers being spaced apart from each other,
the thickness of the intermediate layer varies according to the sub-pixels, and
in each of the pixels the intermediate layer is formed as one piece.
13. An organic light-emitting display device comprising:
pixels to emit light in a first direction, comprising a first electrode, a second electrode, and an intermediate layer disposed between the first and second electrodes, wherein,
each pixel is divided into red, green, and blue sub-pixels, the red, green, and blue sub-pixels respectively comprising red, green, and blue emission layers disposed in the intermediate layer, the red, green, and blue emission layers being spaced apart from each other,
the thickness of the intermediate layer varies according to the sub-pixels,
the sub-pixels of adjacent pixels are symmetrically disposed according to color about a boundary between the adjacent pixels, and
the intermediate layer is formed as one or more pieces that each extend across the boundary so as to be disposed in at least two of the adjacent pixels.
14. A method of manufacturing an organic light-emitting display device having a plurality of pixels that are each divided into red, green, and blue sub-pixels, the method comprising:
forming first electrodes on a surface of a substrate;
forming emission layers and an intermediate layer on the first electrodes, wherein the forming of the emission layers and the forming of the intermediate layer comprises varying a thickness of the intermediate layer according to the sub-pixels as to cause resonance between the first electrodes and a second electrode when light is emitted; and
forming the second electrode on the intermediate layer, wherein
the forming of the intermediate layer further comprises:
forming first portions of the intermediate layer across adjacent red and green sub-pixels in each of the pixels; and
forming second portions of the intermediate layer across adjacent red and blue sub-pixels in each of the pixels, such that the respective first and second portions are joined together.
15. The method of claim 14 , wherein the forming of the intermediate layer further comprises:
forming the first portions of the intermediate layer in first regions; and
forming the second portions of the intermediate layer in second regions that overlap the first regions.
16. The method of claim 15 , wherein the forming of the emission layers further comprises forming red emission layers where the first regions and the second regions overlap.
17. The method of claim 14 , wherein the forming of the first portions of the intermediate layer comprises: using a first mask having openings that correspond to each of the first portions to pattern the first portions.
18. The method of claim 14 , wherein the forming of the second portions of the intermediate layer comprises using a second mask having openings that correspond to each of the second portions to pattern the second portions.
19. The method of claim 14 , wherein the forming of the emission layers and the intermediate layer further comprises forming the emission layers within the intermediate layer.
20. The method of claim 19 , wherein the forming of the intermediate layer further comprises:
forming a hole injection layer on the first electrodes to a generally constant thickness; and
forming a hole transport layer on the hole injection layer, such that a thickness of the hole transport layer varies according to the sub-pixels.
21. The method of claim 19 , wherein the forming of the intermediate layer further comprises:
forming a hole injection layer on the first electrodes, such that a thickness of the hole injection layer varies according to the sub-pixels; and
forming a hole transport layer on the hole injection layer to a generally constant thickness.
22. The method of claim 19 , wherein the forming of the intermediate layer further comprises:
forming a hole injection layer on the first electrodes, such that a thickness of the hole injection layer varies according to the sub-pixels; and
forming a hole transport layer on the hole injection layer, such that a thickness of the hole transport layer varies according to the sub-pixels.
23. The method of claim 14 , wherein the forming of the emission layer and the intermediate layer further comprises:
forming a first portion of the intermediate layer on the first electrodes;
forming the emission layers on the first portion;
forming a second portion of the intermediate layer on the emission layers, such that the thickness of the second portion varies according to the sub-pixels.
24. The method of claim 23 , wherein the second portion is an electron transport layer.
25. A method of manufacturing an organic light-emitting display device having a plurality of pixels that are each divided into red, green, and blue sub-pixels, the method comprising:
forming first electrodes on a surface of a substrate;
forming emission layers and an intermediate layer on the first electrodes, wherein the forming of the emission layers and the forming of the intermediate layer comprises varying a thickness of the intermediate layer according to the sub-pixels as to cause resonance between the first electrodes and a second electrode when light is emitted; and
forming the second electrode on the intermediate layer, wherein
the forming of the intermediate layer further comprises, forming the intermediate layer as one piece in each of the pixels.
26. An organic light-emitting display device comprising:
a substrate;
pixels disposed on the substrate and divided into red, green, and blue sub-pixels; the pixels comprising:
a first electrode;
a second electrode;
an intermediate layer disposed between the first electrode and the second electrode, the intermediate layer having a thickness that varies according to the sub-pixels; and
red, green, and blue emission layers disposed within the intermediate layer in the red, green, and blue sub-pixels, respectively, wherein,
the red, green, and blue emission layers are spaced apart from each other,
in each of the pixels, the red sub-pixel is disposed between the blue and green sub-pixels, and
the thickness of the intermediate layer is at a maximum in the red sub-pixels.
27. The device of claim 26 , wherein the intermediate layer comprises a hole injection layer, a hole transport layer, and an electron transport layer.
28. The device of claim 26 , wherein the first electrode is reflective, and the second electrode is semi-transparent or transparent.
29. The device of claim 26 , wherein a resonance occurs between the first electrode and the second electrode when light is emitted from the emission layers.
30. An organic light-emitting display device comprising:
a substrate;
pixels disposed on the substrate and divided into red, green, and blue sub-pixels; the pixels comprising:
a first electrode;
a second electrode;
an intermediate layer disposed between the first electrode and the second electrode, the intermediate layer having a thickness that varies according to the sub-pixels; and
red, green, and blue emission layers disposed within the intermediate layer in the red, green, and blue sub-pixels, respectively, wherein,
the red, green, and blue emission layers are spaced apart from each other,
the red sub-pixels are disposed between the blue and green sub-pixels,
the thickness of the intermediate layer is at a maximum in the red sub-pixels, and
in each of the pixels, the intermediate layer is formed as one piece.