Organic light emitting diode display and method for manufacturing the same
View Patent ↗A method for manufacturing an organic light emitting diode (“OLED”) display which includes first and second pixels each displaying a different color, the method includes: sequentially depositing a first transparent conductive layer and a translucent conductive layer; forming an intermediate first electrode on the second pixel by photolithography and etching of the translucent conductive layer; depositing a second transparent conductive layer on the intermediate first electrode and the first transparent conductive layer; forming a first electrode of the first pixel which includes upper and lower layers on the first pixel and a first electrode of the second pixel which includes a lower first electrode, an intermediate first electrode, and an upper first electrode by photolithography and etching of the second transparent conductive layer and the first transparent conductive layer; forming an emission layer on the first electrodes of the first and second pixels; and forming a second electrode on the emission layer.
1. An organic light emitting diode (OLED) display comprising first to third pixels each displaying a different color, wherein each pixel comprises:
a first electrode;
a second electrode facing the first electrode; and
an emission layer sandwiched between the first and second electrodes,
wherein first electrodes of the first and second pixels comprise a transparent conductive oxide, and
a first electrode of the third pixel comprises
a lower first electrode that comprises a transparent conductive oxide,
an intermediate first electrode formed on the lower first electrode and comprising a translucent conductor which forms microcavities with the second electrode, and
an upper first electrode formed on the intermediate first electrode, comprising a transparent conductive oxide, and covering upper and lateral surfaces of the intermediate first electrode.
2. The OLED display of claim 1 , wherein the upper first electrode has a thickness of 400 Å to 800 Å, and the lower first electrode has a thickness of 100 Å to 500 Å.
3. The OLED display of claim 2 , wherein first electrodes of the first and second pixels comprise lower and upper layers, and the lower layer has a thickness which is substantially the same as the thickness of a lower first electrode of the third pixel and the upper layer has a thickness which is substantially the same as the thickness of an upper first electrode of the third pixel.
4. The OLED display of claim 3 , wherein the intermediate first electrode has a thickness of 50 Å to 300 Å.
5. The OLED display of claim 4 , wherein the lower first electrode and the upper first electrode comprise at least one selected from ITO, IZO and ZnO.
6. The OLED display of claim 5 , wherein the intermediate first electrode comprises at least one selected from among silver (Ag), aluminum (Al), gold (Au), nickel (Ni), magnesium (Mg), and an alloy of at least one of the foregoing.
7. The OLED display of claim 6 , wherein the first pixel is a red pixel, the second pixel is a blue pixel and the third pixel is a green pixel.
8. The OLED display of claim 7 , wherein the emission layer comprises a plurality of sub-emission layers each emitting light of a different wavelength, and which emits white light by combining the lights of different wavelengths.
9. The OLED display of claim 8 , wherein each of the first to third pixels further comprises a color filter formed under the first electrode.
10. The OLED display of claim 8 , further comprising
a white pixel, wherein the white pixel comprises:
a first electrode,
a second electrode facing the first electrode; and
an emission layer sandwiched between the first and second electrodes,
wherein the first electrode of the white pixel comprises lower and upper layers comprising a conductive oxide.
11. The OLED display of claim 2 , wherein the upper first electrode has a thickness of 550 Å to 650 Å.
12. The OLED display of claim 1 , wherein the first pixel is a red pixel, the second pixel is a blue pixel and the third pixel is a green pixel.
13. The OLED display of claim 12 , wherein the emission layer comprises a plurality of sub-emission layers each emitting light of a different wavelength, and which emits white light by combining the light of different wavelengths.
14. The OLED display of claim 13 , wherein the first to third pixels further comprise a color filter formed under the first electrode, respectively.
15. The OLED display of claim 12 , further comprising
a white pixel, wherein the white pixel comprises:
a first electrode;
a second electrode facing the first electrode; and
an emission layer sandwiched between the first and second electrodes,
wherein the first electrode of the white pixel comprises lower and upper layers comprising a conductive oxide.