Organic light emitting diode display
View Patent ↗An organic light emitting diode (“OLED”) display includes first to third pixels each displaying a different color, wherein each pixel includes a first electrode, a second electrode facing the first electrode, and an emission layer positioned between the first and second electrodes, wherein first electrodes of first and second pixels are a single layer including a conductive oxide, respectively. A first electrode of the third pixel includes a lower first electrode including a conductive oxide, an intermediate first electrode formed on the lower first electrode and including a semitransparent conductor which forms microcavities with the second electrode, and an upper first electrode formed on the intermediate first electrode and including a conductive oxide. A method for manufacturing the OLED is also disclosed.
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 first and second pixels are a single layer comprising a conductive oxide, respectively, and
a first electrode of the third pixel comprises
a lower first electrode comprising a conductive oxide,
an intermediate first electrode formed on the lower first electrode and comprising a semitransparent conductor, and
an upper first electrode formed on the intermediate first electrode and comprising a conductive oxide.
2. The OLED display of claim 1 , wherein the intermediate first electrode forms microcavities with the second electrode.
3. The OLED display of claim 2 , wherein the first pixel is a red pixel, the second pixel is a blue pixel and the third pixel is a green pixel.
4. The OLED display of claim 3 , 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.
5. The OLED display of claim 4 , wherein the emission layer comprises:
a first sub-emission layer which emits light of a first color;
a second sub-emission layer which emits light of a second color; and
a third sub-emission layer which emits light of a third color,
wherein the first to third sub-emission layers are repeatedly stacked at least twice.
6. The OLED display of claim 4 , wherein the first to third pixels further comprise a color filter formed under the first electrode, respectively.
7. The OLED display of claim 6 , wherein the first electrodes of the first and second pixels and the lower first electrode of the third pixel are formed on the same layer.
8. The OLED display of claim 6 , wherein the intermediate first electrode is thinner than the lower first electrode and the upper first electrode.
9. The OLED display of claim 8 , wherein the upper first electrode has a thickness of about 300 Å to about 2000 Å.
10. The OLED display of claim 9 , wherein the intermediate first electrode has a thickness of about 50 Å to about 300 Å.
11. The OLED display of claim 6 , wherein the lower and upper first electrodes comprise at least one selected from among ITO, IZO and ZnO.
12. The OLED display of claim 11 , 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.
13. The OLED display of claim 3 , 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 is a single layer comprising a conductive oxide.