Organic light emitting display with reflective electrode
View Patent ↗An organic light emitting display is disclosed. One embodiment of the organic light emitting display includes a substrate member and a plurality of pixels that are formed on the substrate member. At least one of the pixels includes a thin film transistor, a light emitting element that is electrically connected to the thin film transistor, and a reflective layer that is disposed between the thin film transistor and the light emitting element and that is insulated from each of the thin film transistor and the light emitting element.
1. An organic light emitting display, comprising:
a substrate; and
a plurality of pixels formed over the substrate,
wherein at least one of the pixels comprises:
a thin film transistor;
a light emitting element that is electrically connected to the thin film transistor via a contact in a contact hole; and
a reflective layer that is interposed between the thin film transistor and the light emitting element, the reflective layer being insulated from each of the thin film transistor and the light emitting element, wherein the contact extends through the reflective layer.
2. The organic light emitting display of claim 1 , wherein the reflective layer comprises a penetration hole formed therethrough, and
wherein the thin film transistor and the light emitting element are electrically connected to each other through the penetration hole of the reflective layer.
3. The organic light emitting display of claim 2 , wherein the reflective layer substantially continuously covers substantially the entire portion of the substrate.
4. The organic light emitting display of claim 2 , wherein the penetration hole of the reflective layer has a circular shape with a diameter of about 2 to about 20 μm.
5. The organic light emitting display of claim 2 , wherein the penetration hole of the reflective layer has a square or rectangular shape, and wherein a length in at least one dimension of the shape is about 2 to about 20 μm.
6. The organic light emitting display of claim 1 , wherein the reflective layer comprises silver (Ag).
7. The organic light emitting display of claim 1 , further comprising:
a planarization layer interposed between the thin film transistor and the reflective layer, and
an interlayer protective layer interposed between the reflective layer and the light emitting element.
8. The organic light emitting display of claim 7 , wherein the interlayer protective layer has a transmittance of about 80% or more with respect to visible light.
9. The organic light emitting display of claim 7 , wherein the interlayer protective layer has a thickness of about 200 to about 2000 Å.
10. An organic light emitting display comprising:
a substrate;
a plurality of pixels on the substrate;
a thin film transistor formed over the substrate, the thin film transistor comprising a source, a drain, and a gate;
an interlayer insulating layer formed over the thin film transistor;
a source electrode and a drain electrode formed over the interlayer insulating layer, the source electrode and the drain electrode being electrically connected to the source and the drain, respectively, through the interlayer insulating layer,
a planarization layer formed over the interlayer insulating layer such that the source electrode and the drain electrode are interposed between the planarization layer and the interlayer insulating layer;
a reflective layer formed over the planarization layer;
a first electrode formed over the reflective layer, the first electrode being electrically connected to the drain electrode with a contact extending through the planarization layer and the reflective layer;
a pixel definition layer formed over an interlayer protective layer, the pixel definition layer including an opening for exposing the first electrode;
an organic light-emitting layer formed over the first electrode within the opening; and
a second electrode formed over the pixel definition layer and the organic light-emitting layer,
wherein the interlayer protective layer is interposed between the reflective layer and the first electrode such that the reflective layer is electrically isolated from the first electrode.
11. The organic light emitting display of claim 10 , wherein the reflective layer covers substantially the entire portion of the planarization layer.
12. The organic light emitting display of claim 10 , wherein the reflective layer includes a penetration hole such that the first electrode is electrically connected to the drain electrode.
13. The organic light emitting display of claim 12 , wherein the penetration hole has a circular shape with a diameter of about 2 to about 20 μm.
14. The organic light emitting display of claim 12 , wherein the penetration hole has a square or rectangular shape with a length in at least one dimension of about 2 to about 20 μm.
15. The organic light emitting display of claim 10 , wherein the reflective layer comprises silver (Ag).
16. The organic light emitting display of claim 10 , wherein the interlayer protective layer has a transmittance of about 80% or more with respect to visible light.
17. The organic light emitting display of claim 10 , wherein the interlayer protective layer has a thickness of about 200 to about 2000 Å.
18. The organic light emitting display of claim 10 , wherein the reflective layer substantially continuously covers the planarization layer without being partitioned.
19. The organic light emitting display of claim 1 , wherein the reflective layer overlaps the thin film transistor.
20. The organic light emitting display of claim 10 , wherein the reflective layer overlaps the thin film transistor.