OLED device having improved power distribution
View Patent ↗An organic light-emitting diode (OLED) device, comprising: a first electrode and a second electrode having one or more organic layers formed there-between, at least one organic layer being light-emitting, the first and second electrodes defining one or more light-emissive areas, at least one of the electrodes being transparent; a transparent insulator layer formed adjacent to the transparent electrode opposite the one or more organic layer(s); and one or more reflective, electrically-conductive bus formed in a layer adjacent to the transparent insulator layer opposite the transparent electrode, wherein the reflective, electrically-conductive bus comprises a reflective surface directed towards the light-emitting layer and covers only a portion of the light-emissive areas.
1. An organic light-emitting diode (OLED) device, comprising:
a first electrode and a second electrode having one or more organic layers formed there-between, at least one organic layer being light-emitting, the first and second electrodes defining one or more light-emissive areas, at least one of the electrodes being transparent;
a transparent insulator layer formed adjacent to the transparent electrode opposite the one or more organic layer(s); and
one or more reflective, electrically-conductive bus formed in a layer adjacent to the transparent insulator layer opposite the transparent electrode, wherein the reflective, electrically-conductive bus comprises a reflective surface directed towards the light-emitting layer and covers only a portion of the light-emissive areas.
2. The organic light-emitting diode (OLED) device of claim 1 , wherein the OLED device is a bottom-emitter further comprising a transparent substrate, and wherein the reflective bus, transparent insulator, transparent electrode, organic layer(s), and other electrode are formed in that order on the transparent substrate, and wherein the other electrode is a reflective electrode.
3. The organic light-emitting diode (OLED) device of claim 1 , wherein the OLED device is a top-emitter further comprising a substrate, and wherein the other electrode, organic layer(s), transparent electrode, transparent insulator, and reflective bus are formed in that order on the substrate, and wherein the other electrode is a reflective electrode.
4. The organic light-emitting diode (OLED) device of claim 1 , wherein the reflective electrically-conductive bus is a power bus connected to an electrode through a via in the transparent insulating layer.
5. The organic light-emitting diode (OLED) device of claim 1 , further comprising a transistor formed on a substrate and wherein the reflective electrically-conductive bus is a signal or power bus connected to a terminal of the transistor.
6. The organic light-emitting diode (OLED) device of claim 5 , wherein the reflective electrically-conductive bus is a data signal or a select signal bus.
7. The organic light-emitting diode (OLED) device of claim 1 ,comprising a plurality of reflective electrically-conductive busses adjacent the transparent insulator opposite the transparent electrode and in combination covering only a portion of the light-emissive area.
8. The organic light-emitting diode (OLED) device of claim 1 , wherein the reflective electrically-conductive bus comprises a metal or metal alloy.
9. The organic light-emitting diode (OLED) device of claim 8 , wherein the reflective electrically-conductive bus comprises aluminum, silver, or magnesium or alloys including aluminum, silver, or magnesium.
10. The organic light-emitting diode (OLED) device of claim 1 , further comprising one or more electrically-conductive busses formed in areas between the light emissive areas.
11. The organic light-emitting diode (OLED) device of claim 10 , wherein the one or more electrically-conductive busses formed in areas between the light emissive areas are formed in a common step with the reflective electrically-conductive bus covering a portion of the light-emissive areas.
12. The organic light-emitting diode (OLED) device of claim 10 , wherein the one or more electrically-conductive busses formed in areas between the light emissive areas are electrically connected to the reflective electrically-conductive bus covering a portion of the light-emissive areas.
13. The organic light-emitting diode (OLED) device of claim 1 , comprising a plurality of light-emissive areas and wherein the reflective electrically-conductive bus covers a portion of each of the plurality of light-emissive areas.
14. The organic light-emitting diode (OLED) device of claim 1 , wherein the transparent insulating layer is a planarization layer.
15. The organic light-emitting diode (OLED) device of claim 1 , wherein the transparent electrode comprises a metal oxide.
16. The organic light-emitting diode (OLED) device of claim 1 , further comprising a scattering layer located between the reflective electrically-conductive bus and the transparent electrode.
17. The organic light-emitting diode (OLED) device of claim 1 , wherein the reflective surface of the reflective electrically-conductive bus is light scattering.
18. The organic light-emitting diode (OLED) device of claim 1 , wherein portions of the light emissive area not covered by the reflective electrically-conductive bus are located on more than one side of the reflective, electrically-conductive bus.
19. The organic light-emitting diode (OLED) device of claim 1 , wherein the reflective electrically-conductive bus has a reflective side facing the transparent electrode and a light-absorbing side opposite the transparent electrode.
20. The organic light-emitting diode (OLED) device of claim 1 , wherein the reflective surface of the reflective electrically-conductive bus is not parallel to one or more of the electrodes.