Method of manufacturing organic light-emitting device
A method of manufacturing an organic light-emitting device including a plurality of pixels using an organic solution spray apparatus, where each of the pixels comprises a plurality of sub-pixels having different colors, includes: preparing a substrate on which a plurality of sub-pixel regions is defined; generating a potential difference between a nozzle of the organic solution spray apparatus and the sub-pixel regions; spraying an organic solution from the nozzle of the organic solution spray apparatus to the sub-pixel regions; and forming an organic material layer by selectively depositing the organic solution to the sub-pixel regions using the potential difference between the nozzle and the sub-pixel regions.
1. A method of manufacturing an organic light-emitting device comprising a plurality of pixels using an organic solution spray apparatus, wherein each of the pixels comprises a plurality of sub-pixels having different colors from one another, the method comprising:
preparing a substrate on which a plurality of sub-pixel regions is defined;
generating a potential difference between a nozzle of the organic solution spray apparatus and at least one sub-pixel region among the plurality of sub-pixel regions;
spraying an organic solution from the nozzle of the organic solution spray apparatus to the sub-pixel regions; and
forming an organic material layer by selectively depositing the organic solution onto the at least one sub-pixel region among the plurality of sub-pixel regions;
the generating the potential difference between the nozzle of the organic solution spray apparatus and the at least one sub-pixel region among the plurality of sub-pixel regions comprises
applying a potential having a first polarity to a nozzle of the organic solution spray apparatus;
applying a potential having a second polarity opposite to the first polarity to the least one sub-pixel region among the plurality of sub-pixel regions;
applying a potential having the first polarity to at least one sub-pixel region remaining among the plurality of sub-pixel regions.
2. The method of claim 1 , wherein each of the sub-pixel regions is defined by a lower electrode disposed on the substrate and connected to a thin film transistor.
3. The method of claim 1 , wherein the generating the potential difference between the nozzle of the organic solution spray apparatus and the at least one sub-pixel region among the plurality of sub-pixel regions comprises applying a voltage to the sub-pixel regions through the thin film transistor.
4. The method of claim 2 , further comprising:
forming an upper electrode on the organic material layer.
5. The method of claim 1 , wherein the generating the potential difference between the nozzle of the organic solution spray apparatus and the at least one sub-pixel region among the plurality of sub-pixel regions comprises applying a positive (+) potential to the nozzle of the organic solution spray apparatus.
6. The method of claim 5 , wherein the forming the organic material layer comprises selectively depositing the organic solution in the sub-pixel region having the lowest potential among the sub-pixel regions.
7. The method of claim 5 , wherein the generating the potential difference between the nozzle of the organic solution spray apparatus and the at least one sub-pixel region among the plurality of sub-pixel regions further comprises applying an electric potential lower than an electric potential of the nozzle to the sub-pixel regions.
8. The method of claim 1 , wherein the organic solution is dispersed and sprayed from the nozzle to cover an area having a diameter greater than a diameter of the nozzle.
9. The method of claim 8 , wherein the organic solution is sprayed to cover at least two of the sub-pixel regions.
10. The method of claim 8 , wherein
the diameter of the nozzle is in a range of about 50 μm to about 100 μm, and
a voltage applied to the nozzle is in a range of about 7 kV to about 10 kV.
11. The method of claim 1 , wherein the organic solution is converged and sprayed from the nozzle to an area having a diameter less than a diameter of the nozzle.
12. The method of claim 11 , wherein
a diameter of the nozzle is in a range of about 50 μm to about 100 μm, and
a voltage applied to the nozzle is in a range of about 3 kV to about 5 kV.
13. The method of claim 11 , wherein the organic solution is sprayed to cover the at least one sub-pixel region.
14. The method of claim 1 , wherein the sub-pixel regions comprise first, second and third sub-pixel regions, which have different colors from one another.
15. The method of claim 14 , wherein the first, second and third sub-pixel regions comprise red, green and blue sub-pixel regions.
16. The method of claim 14 , wherein the first, second and third sub-pixel regions are defined by a first lower electrode connected to a first thin film transistor, a second lower electrode connected to a second thin film transistor, and a third lower electrode connected to a third thin film transistor, respectively.
17. The method of claim 14 , further comprising:
forming a first organic material layer in the first sub-pixel region by spraying a first organic solution from the nozzle of the organic solution spray apparatus.
18. The method of claim 17 , further comprising:
forming a second organic material layer in the second sub-pixel region by spraying a second solution from the nozzle of the organic solution spray apparatus; and
forming a third organic material layer in the third sub-pixel region by spraying a first organic solution from the nozzle of the organic solution spray apparatus.
19. The method of claim 1 , further comprising:
forming an upper electrode on the organic material layer.