Organic light emitting display having reduced manufacturing shorts and method of fabricating the same
In one embodiment, an organic light emitting display (OLED) includes a thin film transistor (TFT) disposed on a substrate. In addition, the display includes: an insulating layer disposed on the TFT and having a via hole; a pixel electrode disposed on the insulating layer and connected to a drain electrode of the TFT through the via hole; an emission layer disposed on the pixel electrode; and an opposite electrode pattern disposed on the emission layer and exposing at least an upper region of the via hole. This avoids close configuration proximity between the opposite electrode and the pixel layer thus reducing the possibility of a short circuit.
1. A method of fabricating an organic light emitting display, comprising:
forming a thin film transistor over a substrate, the thin film transistor including a gate electrode, a source electrode, and a drain electrode;
forming an insulating layer over the thin film transistor;
forming a via hole in the insulating layer in a location corresponding to a portion of one of the source and drain electrodes;
electrically connecting a pixel electrode to one of the source and drain electrodes through the via hole;
forming a pixel defining layer over the pixel electrode in at least a location corresponding to the via hole, wherein the pixel defining layer comprises an opening in a location corresponding to a portion of the pixel electrode and is formed with a thickness of about 3000 Å or less; forming an emission layer over the pixel electrode; and
patterning an opposite electrode, the opposite electrode being disposed over the emission layer;
wherein the emission layer and the opposite electrode are formed to each the via hole.
2. The method of claim 1 , wherein patterning the opposite electrode comprises using a stripe-shaped mask.
3. The method of claim 1 , wherein patterning the opposite electrode comprises using a slot-shaped mask.
4. The method of claim 1 , wherein patterning the opposite electrode comprises using a mask comprising a patterned portion corresponding to at least the via hole.
5. The method of claim 1 , wherein the pixel defining layer is formed with a thickness of about 1,500 Å or more.
6. The method of claim 1 , wherein forming the insulating layer comprises using at least one of an inorganic layer, and an organic layer.
7. The method of claim 1 , wherein forming the emission layer comprises using a laser induced thermal imaging process.
8. The method of claim 1 , further comprising forming at least one of a charge injection layer and a charge transport layer over or under the emission layer.
9. An organic light emitting display manufactured by a process comprising:
forming a thin film transistor over a substrate, the thin film transistor including a gate electrode, a source electrode, and a drain electrode;
forming an insulating layer over the thin film transistor;
forming a via hole in the insulating layer in a location corresponding to a portion of one of the source and drain electrodes;
electrically connecting a pixel electrode to one of the source and drain electrodes through the via hole;
forming a pixel defining layer over the pixel electrode in at least a location corresponding to the via hole, the pixel defining layer comprising an opening in a location corresponding to a portion of the pixel electrode and wherein the pixel defining layer is formed with a thickness of about 3,000 Å or less;
forming an emission layer over the pixel electrode; and
patterning an opposite electrode, the opposite electrode being disposed over the emission layer;
wherein the emission layer and the opposite electrode are formed to each the via hole.
10. The display of claim 9 , wherein the process further comprises forming the pixel defining layer with a thickness of about 1,500 Å or more.