Organic light-emitting display device with spacer between sub-pixels
Disclosed is an organic light-emitting display device, which prevents lateral current leakage by providing a structure on a bank so as to cut off an organic material, which is formed in a subsequent process, around the structure.
1. An organic light-emitting display device comprising:
a substrate including a plurality of pixels, each pixel comprising a first sub-pixel, a second sub-pixel and a third sub-pixel, each of the first to third sub-pixels having an emission portion and a non-emission portion surrounding the emission portion;
a first electrode on the emission portion of each of the first to third sub-pixels;
a bank on the non-emission portion;
a first spacer having a negatively tapered shape and provided on the bank at least between the first sub-pixel and the second sub-pixel;
a second spacer placed between the second sub-pixel and the third sub-pixel, wherein the second spacer is higher than the first spacer;
an organic stack above the first electrode and the first spacer, wherein the organic stack on the first electrode is spaced from sides of the first electrode; and
a second electrode disposed on the organic stack,
wherein a length of the first spacer in a first direction is shorter than a dimension of the first sub-pixel in the first direction, the second sub-pixel and the third sub-pixel separated from the first sub-pixel in a second direction crossing the first direction, and
wherein the first spacer is placed to block the emission portion of the second sub-pixel from the emission portion of the first sub-pixel.
2. The device according to claim 1 , wherein the length of the first spacer in the first direction is greater than a dimension of the emission portion of the second sub-pixel in the first direction.
3. The device according to claim 1 , wherein the second sub-pixel and the third sub-pixel are alternately disposed in the first direction, and wherein the first spacer extends between the first sub-pixel and the third sub-pixel.
4. The device according to claim 3 , wherein the first sub-pixel extends in the first direction at least to an edge of the third sub-pixel, the edge located at a side of the third pixel away from the second sub-pixel.
5. The device according to claim 1 , wherein the first spacer comprises a first segment between the first sub-pixel and the second sub-pixel and a second segment between the second sub-pixel and the third sub-pixel, wherein the first segment and the second segment are directly connected.
6. The device according to claim 5 , wherein the second segment is longer than a dimension of the second sub-pixel or a dimension of the third sub-pixels in the second direction.
7. The device according to claim 1 , wherein the first spacer comprises a first segment between the first sub-pixel and the second sub-pixel, and a second segment between the first sub-pixel and the third sub-pixel, and the first segment and the second segment are separated in the first direction.
8. The device according to claim 1 , wherein the first spacer has a width ranging from 1 μm to 5 μm in the second direction crossing the first direction.
9. The device according to claim 1 , wherein a threshold voltage of the first sub-pixel is higher than a threshold voltage of the second sub-pixel.
10. The device according to claim 1 , wherein the second sub-pixel and the third sub-pixel smaller than the first sub-pixel.
11. The device according to claim 1 , wherein the organic stack includes a hole injection layer contacting the first electrode and at least one stack, each of the at least one stack including a sequential stack of a hole transport layer, a light-emitting layer, and an electron transport layer.
12. The device according to claim 11 , wherein the organic stack comprises a plurality of stacks, each of the stack including a sequential stack of a hole transport layer, a light-emitting layer and an electron transport layer, the device further including a charge generation layer between the plurality of stacks.
13. The device according to claim 11 , wherein at last one layer of the organic stack has a gap at sides of the first spacer.
14. The device according to claim 11 , wherein at least one layer of the organic stack on the first spacer has an island shape.
15. The device according to claim 1 , wherein the first sub-pixel is a blue sub-pixel, the second sub-pixel is a red sub-pixel, and the third sub-pixel is a green sub-pixel.
16. An organic light emitting device, comprising:
a first sub-pixel in a pixel configured to emit light of a first color, the first sub-pixel comprising two first electrodes and a first portion of an organic stack sandwiched between the two first electrodes;
a second sub-pixel adjacent to and spaced apart from the first sub-pixel in the pixel, the second sub-pixel configured to emit light of a second color, the second sub-pixel comprising two second electrodes and a second portion of the organic stack sandwiched between the two second electrodes;
a third sub-pixel configured to emit light of a third color, the third sub-pixel comprising two third electrodes and a third portion of the organic stack sandwiched between the two third electrodes, wherein the second sub-pixel and the third sub-pixel are alternately disposed in a first direction, adjacent to the first sub-pixel;
a first spacer between the first sub-pixel and the second sub-pixel, the first spacer placed to block the second portion of the organic stack of the second sub-pixel from the first portion of the organic stack of the first sub-pixel; and
a second spacer placed between the second sub-pixel and the third sub-pixel, wherein the second spacer is higher than the first spacer,
wherein a length of the first spacer in the first direction is shorter than a dimension of an emission portion of the first sub-pixel in the first direction, the second sub-pixel separated from the first sub-pixel in a second direction crossing the first direction.
17. An organic light-emitting display device comprising:
a substrate including a plurality of pixels, the plurality of pixels comprising a first sub-pixel, a second sub-pixel and a third sub-pixel, each of the first to third sub-pixels having an emission portion and a non-emission portion surrounding the emission portion;
a first electrode on the emission portion of each of the first to third sub-pixels;
a bank on the non-emission portion;
a first spacer between the emission portion of the first sub-pixel and the emission portion of the second sub-pixel to block the emission portion of the second sub-pixel from the emission portion of the first sub-pixel;
a second spacer placed between the second sub-pixel and the third sub-pixel, wherein the second spacer is higher in height in a vertical direction from the bank than the first spacer;
an organic stack above the first electrode and the first spacer, wherein the organic stack has at least a first organic stack, a second organic stack, and a charge generation layer, the first organic stack disposed on the first electrode and the first spacer, the second organic stack disposed on the first organic stack, and the charge generation layer disposed between the first and second organic stacks; and
a second electrode on the organic stack.
18. The organic light-emitting display device according to claim 17 , further comprising a capping layer on the second electrode.
19. The organic light-emitting display device according to claim 18 , wherein at least one of the organic stack, the second electrode, and the capping layer has a disconnected portion on at least one side of the first spacer.
20. The organic light-emitting display device according to claim 18 , wherein at least one of the organic stack, the second electrode, and the capping layer has an island shape.
21. The organic light-emitting display device according to claim 17 , wherein a first thickness of a first color light-emitting layer for the first sub-pixel is different from a second thickness of a second color light-emitting layer for the second sub-pixel, and the second thickness of the second color light-emitting layer is different from a third thickness of a third color light-emitting layer for the third sub-pixel.
22. The organic light-emitting display device according to claim 17 , wherein the charge generation layer comprises a p-type charge generation layer and an n-type charge generation layer.
23. The organic light-emitting display device according to claim 17 , wherein at least one of the second sub-pixel and the third sub-pixel is smaller than the first sub-pixel in a first direction.
24. The organic light-emitting display device according to claim 17 , wherein a length of the first spacer in a first direction is shorter than a length of the emission portion of the first sub-pixel in the first direction and longer than a length of the emission portion of the second sub-pixel.
25. The organic light-emitting display device according to claim 24 , wherein the second sub-pixel and the third sub-pixel are separated from the first sub-pixel in a second direction crossing the first direction and wherein the second sub-pixel and the third sub-pixel are alternately disposed in the first direction.
26. The organic light-emitting display device according to claim 24 , wherein the first spacer extends between the first sub-pixel and the third sub-pixel.
27. The organic light-emitting display device according to claim 24 , wherein the first sub-pixel extends in the first direction at least to an edge of the third sub-pixel, the edge located at a side of the third sub-pixel away from the second sub-pixel.
28. The organic light-emitting display device according to claim 17 , wherein the first spacer comprises a first segment between the first sub-pixel and the second sub-pixel and a second segment between the second sub-pixel and the third sub-pixel, wherein the first segment and the second segment are directly connected.
29. The organic light-emitting display device according to claim 17 , wherein the first spacer comprises a first segment between the first sub-pixel and the second sub-pixel, and a second segment between the first sub-pixel and the third sub-pixel, and the first segment and the second segment are separated in a first direction.
30. The organic light-emitting display device according to claim 29 , wherein the second segment is longer than a dimension of the second sub-pixel or a dimension of the third sub-pixels in the first direction.
31. The organic light-emitting display device according to claim 17 , wherein a threshold voltage of the first sub-pixel is highest among the first to third sub-pixels.
32. The organic light-emitting display device according to claim 17 , wherein a size of the second spacer is different from a size of the first spacer.