Organic, colored, electroluminescent display and the production thereof
View Patent ↗The present invention relates to an organic, colored, electroluminescent display having the following features: between two strip-shaped structured electrodes running transverse to each other, there is a functional layer of electroluminescent polymers that are delimited by the windows ( 10 ) of an insulating layer ( 5 ), the functional polymers define pixels of different colors R, G and B for a matrix, strip-shaped ridges of at least one additional insulating layer ( 15 and 20 in the case of two layers), which structure one of the electrodes, separate pixels of the same color from pixels of different colors, where pixels of the same color are located between two adjacent ridges.
1. A colored, organic electroluminescent display, comprising:
a substrate;
parallel first electrode strips on the substrate;
a first insulating layer on the substrate and the first electrode strips, the first insulating layer having windows positioned over the first electrode strips;
a functional layer disposed in and delimited by the windows to form pixels;
a second insulating layer structured to form strip-shaped ridges crosswise to the first electrode strips, the strip-shaped ridges having a cross-section with an overhanging top edge, wherein the strip-shaped ridges separate pixels of a first color from pixels of a second color, and wherein the pixels of the first color are located between adjacent strip-shaped ridges; and
second electrode strips oriented transverse to the first electrode strips and contacting the functional layer in the windows, wherein at least one of the second electrode strips is bounded on both sides by the strip-shaped ridges.
2. The display of claim 1 , further comprising:
electrode connectors on the substrate that extend perpendicular to the first electrode strips and are positioned adjacent to an edge of one of the first electrode strips; and
an encapsulation covering the first insulating layer, the second insulating layer and an end portion of each electrode connector;
wherein the first insulating layer has windows positioned over the electrode connectors.
3. The display of claim 1 , further comprising:
electrode connectors on the substrate that extend perpendicular to the first electrode strips and are positioned adjacent to an edge of one of the first electrode strips; and
an encapsulation covering the first insulating layer, the second insulating layer and one end of each electrode connector;
wherein the first insulating layer has areas extending between at least two of the electrode connectors.
4. The display of claim 1 , further comprising:
metal strips, wherein:
each of the first electrode strips is mechanically and electrically connected with a metal strip that is parallel to the first electrode strips;
the first insulating layer completely covers the metal strips; and
the encapsulation covers all of the first insulating layer, the second insulating layer and the metal strips.
5. The display of claim 1 , wherein:
the windows are strip-shaped and are crosswise to the first electrode strips.
6. A method for fabricating displays, comprising:
applying a first insulating layer over first electrode strips on a substrate;
structuring windows into the first insulating layer;
applying a second insulating layer and a third insulating layer;
structuring the second and third insulating layers into ridges that are crosswise to the first electrode strips and between the windows of the first insulating layer;
applying a functional layer in the windows of the first layer, wherein applying the functional layer includes printing the functional layer; and
applying a second electrode such that the second electrode has a strip-shape formed by the ridges and the second electrode contacts the functional layer.
7. The method of claim 6 , wherein:
applying the functional layer includes a drying process.
8. The method of claim 6 , wherein:
applying the functional layer includes a continuous dispensing process.
9. The method of claim 6 , further comprising:
forming metal strips that are completely covered by the first insulating layer, wherein each of the first electrode strips is mechanically and electrically connected to a metal strip; and
encapsulating the first, second and third insulating layers and the metal strips.
10. The method of claim 9 , wherein:
forming the metal strips includes forming the metal strips of one or more metals of the group consisting of aluminum and chromium.
11. The method of claim 6 , further comprising:
forming metal strips that are completely covered by the first insulating layer, wherein each of the first electrode strips is mechanically and electrically connected to a metal strip; and
encapsulating the metal strips such that one end of each of the metal strips is exposed.
12. The method of claim 11 , wherein:
forming the metal strips includes forming the metal strips of one or more metals of the group consisting of aluminum and chromium.
13. The method of claim 6 , further comprising:
structuring electrode connectors that are crosswise to and extend toward the first electrode strips; and
structuring the first insulating layer to have windows positioned over the electrode connectors.
14. The method of claim 6 , wherein:
structuring windows into the first insulating layer includes structuring strip-shaped windows in the first insulating layer that extend crosswise to the first electrode strips.
15. The method of claim 6 , wherein:
applying the first insulating layer includes applying a positive photoresist.
16. The method of claim 15 , wherein:
applying the third insulating layer includes applying the positive photoresist.
17. The method of claim 6 , wherein:
applying the second insulating layer includes applying a polyimide.
18. The method of claim 6 , wherein:
the second insulating layer is over the first insulating layer and the third insulating layer is over the second insulating layer.
19. The method of claim 18 , wherein:
the third insulating layer is structured before the second insulating layer is structured.