Full color OLED and method of fabricating the same
A full color organic light emitting display device (OLED) and a method of fabricating the same are provided. The OLED includes an element substrate and an encapsulating substrate. The element substrate includes a color filter layer or a color conversion layer, as well as an organic layer with an emission layer that emits light of a single color. The encapsulating substrate includes a color filter or a color conversion layer and a moisture absorbent, and a the color filter or color conversion layer corresponds to the emission region. Accordingly, there is no need to have a separate process for the moisture absorbent and the color filter layer or the color conversion layer may be formed without using a shadow mask, so that a high resolution OLED may be advantageously realized.
1. A method of fabricating a full color organic light emitting display device (OLED), comprising:
forming either a first color filter layer or a first color conversion layer on an element substrate;
forming a pixel electrode on the element substrate;
forming an organic layer including at least an emission layer on the pixel electrode;
forming a counter electrode on the organic layer; and
forming either a second color filter layer or a second color conversion layer comprising a moisture absorbent on an encapsulating substrate corresponding to the element substrate,
wherein either the first color filter layer or the first color conversion layer is formed directly on a first side of the element substrate, the pixel electrode is formed on a second side of the element substrate, and the first side differs from the second side, and
wherein the moisture absorbent is formed only directly on either the second color filter layer or the second color conversion layer and is spaced apart from the counter electrode.
2. The method of claim 1 , further comprising:
forming at least one thin film transistor between the element substrate and the pixel electrode.
3. The method of claim 1 , wherein the pixel electrode and the counter electrode are transparent electrodes.
4. The method of claim 1 , wherein the organic layer comprises an emission layer emitting either white or blue light.
5. The method of claim 4 , wherein the first color filter layer is formed on the element substrate and the second color filter layer is formed on the encapsulating substrate when the emission layer emits white light.
6. The method of claim 4 , wherein the first color conversion layer is formed on the element substrate and the second color conversion layer is formed on the encapsulating substrate when the emission layer emits blue light.
7. The method of claim 1 , wherein the color filter layers or the color conversion layers are formed by a laser induced thermal imaging method, a photolithography method, or an inkjet method.
8. The method of claim 7 , further comprising:
forming a barrier between the color filter layers or the color conversion layers when the color filter layers or the color conversion layers are formed by the inkjet method.
9. The method of claim 1 , wherein the moisture absorbent comprises a transparent material.
10. The method of claim 9 , wherein the moisture absorbent comprises at least one moisture absorbent selected from the group consisting of a nano particle moisture absorbent, a chemical reactive moisture absorbent, and an organic-inorganic moisture absorbent.
11. The method of claim 1 , wherein the moisture absorbent is formed by a screen printing method or a spray coating method.
12. The method of claim 1 , further comprising:
forming a passivation layer covering either the first color filter layer or the first color conversion layer.