OLED comprising an organic insulating layer with grooves and an inorganic layer filling the grooves
View Patent ↗Embodiments of an organic electroluminescence display device and methods of fabricating such devices are disclosed. One embodiment of an organic electroluminescence display device comprises a thin film transistor and wirings disposed on a substrate, wherein the substrate has an emitting region and non-emitting region. The display device further comprises a first insulating layer disposed on the substrate in the emitting region and the non-emitting region, a pixel electrode disposed on the first insulating layer, a second insulating layer disposed on the emitting region to partially expose the pixel electrode, a light-emitting layer disposed on the pixel electrode, and an encapsulation member disposed on the second insulating layer on the non-emitting region.
1. An organic electroluminescent display device, comprising:
a thin film transistor and wirings disposed on a substrate having an emitting region and non-emitting region;
a first insulating layer disposed on the emitting region and the non-emitting region of the substrate, wherein the first insulating layer disposed on the non-emitting region has at least one groove formed therein;
a pixel electrode configured to be driven by the thin film transistor and disposed on the substrate such that a surface of the pixel electrode farthest from the substrate is farther from the substrate than the first insulating layer;
a second insulating layer disposed in the non-emitting region and in the emitting region, wherein the second insulating layer fills the at least one groove formed in the first insulating layer, directly contacts the first insulating layer inside the at least one groove, and is formed of an inorganic insulating material;
a light-emitting layer disposed on the pixel electrode through an opening formed in the second insulating layer; and
an encapsulation member disposed on the second insulating layer in the non-emitting region.
2. The organic electroluminescence display device according to claim 1 , wherein the at least one groove formed in the first insulating layer of the non-emitting region is a circular hole, a polygonal hole, a slit, or a trench.
3. The organic electroluminescence display device according to claim 1 , wherein the at least one groove exposes wirings under the first insulating layer, and wherein the exposed wirings contact the second insulating layer.
4. The organic electroluminescence display device according to claim 1 , wherein the wirings are under the first insulating layer, and an inorganic passivation layer is interposed between the first insulating layer and the wirings.
5. The organic electroluminescence display device according to claim 4 ,
wherein the first insulating layer in the non-emitting region has at least one groove formed therein to expose the inorganic passivation layer, and
wherein the exposed inorganic passivation layer is in contact with the second insulating layer.
6. The organic electroluminescence display device according to claim 5 , wherein the groove formed in the first insulating layer is a circular or polygonal hole, a slit, or a trench.
7. The organic electroluminescence display device according to claim 1 , wherein the inorganic insulating material comprises one or more of a single silicon oxide layer, a single silicon nitride layer, and a stacked layer of a silicon oxide layer and a silicon nitride layer.
8. The organic electroluminescence display device according to claim 1 , wherein the first insulating layer comprises an organic layer.
9. The organic electroluminescence display device according to claim 8 , wherein the first insulating layer comprises at least one of a polyacrylates resin, an epoxy resin, a phenolic resin, a polyamides resin, a polyimides resin, a unsaturated polyesters resin, a poly(phenylenethers) resin, a poly(phenylenesulfides) resin, and a benzocyclobutene (BCB).