Electroluminescent device with a blocking layer and a dummy electrode region
View Patent ↗Disclosed is an organic electroluminescent display, comprising a first active electrode region and a first dummy electrode region, the first dummy electrode region electrically isolated from the first active electrode region. Further disclosed is an organic electroluminescent display, comprising a first active electrode region, a first dummy electrode region, and a blocking layer extending on said dummy electrode region preventing light emission.
1. An organic electroluminescent device, comprising:
a first electrode region, comprising:
a first active electrode region;
a first dummy electrode region; and
a blocking layer extending on said first dummy electrode region preventing light emission from a non-active area of the device, wherein said non-active area stretches over a continuous zone comprising at least two pixel elements of the device.
2. A device according to claim 1 , wherein:
the first active electrode region is within an active area of the device, which allows light emission out of the device; and
the first dummy electrode region is within the non-active area of the device, which prevents light emission out of the device.
3. A device according to claim 2 , wherein the active area is surrounded by the non-active area.
4. The device of claim 3 , wherein:
the first active electrode region and the first dummy electrode region are arranged on a substrate, an edge area of the substrate being free of the first active electrode region and the first dummy electrode region; and
the first dummy electrode region is located between the edge area of the substrate and the first active electrode region.
5. A device according to claim 2 , wherein:
the active area is surrounded by the non-active area; and
the non-active area forms an edge area of the device.
6. A device according to claim 1 , wherein:
the first active electrode region is an active anode region; and
the first dummy electrode region is a dummy anode region.
7. A device according to claim 1 , wherein the blocking layer is opaque to the light produced in the non-active area of the device.
8. A device according to claim 1 , wherein the blocking layer blocks carrier injection into an electroluminescent layer of the at least two pixel elements.
9. A device according to claim 8 , wherein the blocking layer contains a metal.
10. A device according to claim 9 , wherein the blocking layer contains a material selected from a group consisting of copper and chromium.
11. A device according to claim 1 , wherein the blocking layer is electrically insulating.
12. A device according to claim 11 , wherein the blocking layer contains a photo resist material or an inorganic material.
13. A device according to claim 12 , wherein the inorganic material is an oxide or a nitride.
14. A device according to claim 1 , wherein said first electrode region is formed from a plurality of first electrode stripes.
15. A device according to claim 1 , further comprising a second electrode region, comprising:
a second active electrode region; and
a second dummy electrode region.
16. A device according to claim 15 , wherein:
the second active electrode region is within an active area of the device, which allows light emission out of the device; and
the second dummy electrode region is within the non-active area of the device, which prevents light emission out of the device.
17. A device according to claim 15 , wherein:
the second active electrode region is an active cathode region; and
the second dummy electrode region is a dummy cathode region.
18. A device according to claim 15 , wherein said second electrode region is formed from a plurality of second electrode stripes.
19. A device according to claim 15 , wherein said first dummy electrode region and said second dummy electrode region overlap.
20. A device according to claim 15 , further comprising:
a substrate, the first electrode region arranged on the substrate; and
an organic stack arranged on the first electrode region and the second electrode region arranged on the organic stack.
21. A device according to claim 20 , wherein the blocking layer is arranged between the organic stack and the first electrode region.
22. A device according to claim 20 , wherein the substrate contains any of the following materials: glass, quartz, silicon or plastic.
23. A device according to claim 20 , the organic stack comprising a buffer layer, wherein the buffer layer is patterned as electrically isolated conducting regions.
24. A device according to claim 23 , wherein the electrically isolated conducting regions are formed at intersections of first electrode stripes and second electrode stripes.
25. A device according to claim 15 , wherein the second electrode region is selected from the following materials: aluminum, silver, magnesium, calcium, barium, halide, lithium fluoride, cesium fluoride, magnesium fluoride, or combinations thereof.
26. A device according to claim 1 , wherein the first electrode region is selected from the following materials: platinum, gold, palladium, indium, tin oxide, ITO, graphite, silicon, germanium, gallium arsenide, polyaniline, polypyrrole or polythiophene.
27. A device according to claim 1 , which is a display.