OLED display with electrode
View Patent ↗An OLED display comprising a substrate; at least one heat insulating layer disposed over the substrate; a first electrode located over the heat insulating layer and having a thermal conductivity higher than the heat insulating layer; a plurality of thermal contacts provided through the heat insulating layer between the first electrode and the substrate, the thermal contacts comprising material having a thermal conductivity higher than that of the heat insulating layer; one or more organic layers, at least one of which is a light emissive layer, disposed over the first electrode; and a second electrode disposed over the one or more organic layers.
1. An OLED device, comprising:
a) a substrate;
b) at least one heat insulating layer disposed over the substrate;
c) a first electrode located over the heat insulating layer and having a thermal conductivity higher than the heat insulating layer;
d) a plurality of spatially separated thermal contacts for the first electrode, each formed in a separate corresponding via provided through the heat insulating layer between the first electrode and the substrate, the thermal contacts comprising material having a thermal conductivity higher than that of the heat insulating layer and extending from the first electrode through the via to the substrate or a layer formed on the substrate but which does not conduct current;
e) one or more organic layers, at least one of which is a light emissive layer, disposed over the first electrode; and
f) a second electrode disposed over the one or more organic layers.
2. The device claimed in claim 1 wherein the thermal contacts are in thermal contact with the first electrode.
3. The device claimed in claim 2 wherein the thermal contacts are touching the first electrode.
4. The device claimed in claim 3 wherein the thermal contacts are formed in a common manufacturing step with the first electrode.
5. The device claimed in claim 2 , wherein the thermal contacts and the first electrode comprise the same material.
6. The device claimed in claim 2 , wherein the first electrode is made of a metal, a metal oxide, or a metal alloy including one or more of the group including silver, aluminum, manganese, indium tin oxide, or alloys thereof.
7. The device claimed in claim 1 , wherein the heat insulating layer comprises silicon.
8. The device claimed in claim 7 , wherein the heat insulating layer is silicon dioxide.
9. The device claimed in claim 7 , wherein the heat insulating layer is silicon nitride.
10. The device claimed in claim 1 , wherein the heat insulating layer has a thermal conductivity of approximately 1 W/mK.
11. The device claimed in claim 1 , wherein the heat insulating layer is an epoxy or a photoresist.
12. The device claimed in claim 1 , wherein the second electrode transmits light emitted by the light emissive layer.
13. The device claimed in claim 1 , further comprising a thermally conductive layer located between the substrate and the heat insulating layer, and between the substrate and the first electrode.
14. The device claimed in claim 13 , wherein the thermally conductive layer is electrically conductive.
15. The device claimed in claim 13 , wherein the thermally conductive layer is electrically connected to the first electrode.
16. The device claimed in claim 1 , wherein the thermal contacts form a two-dimensional arrangement within a singe pixel area.
17. The device claimed in claim 1 , wherein the substrate is made of a glass, metal foil, plastic or one or more layers of glass, metal foil, or plastic.
18. The device claimed in claim 1 , wherein the substrate is flexible.
19. The device claimed in claim 1 wherein the first electrode is transparent and the thermal contacts are not transparent.