Display device with openings in an insulating structure
View Patent ↗The invention relates to a device, such as an electro-luminescent display device, comprising a substrate, first electrodes which are arranged over the substrate, second electrodes which are arranged over the first electrodes and at least one electrically insulating structure which separates two of the second electrodes and is arranged over at least one of the first electrodes. The insulating structure comprises an opening which extends from the top surface of the structure to the first electrode beneath the structure. The invention further relates to a method of manufacturing such a device. In one preferred embodiment, this method involves the use of sacrificial structures with which openings are obtained the upper parts of which extend along the entire length of the respective insulating structures.
1. A device comprising:
a substrate,
a plurality of first electrodes that are arranged over the substrate,
a plurality of second electrodes that are arranged over the first electrodes, and
at least one electrically insulating structure that is arranged over at least one electrode of the plurality of first electrodes and between two electrodes of the plurality of the second electrodes,
wherein the insulating structures comprises an opening that extends from the top surface of the structure to the first electrode beneath the structure.
2. The device of claim 1 , wherein
an electrically conductive material is arranged in and/or over the insulating structure and contacts the first electrode beneath the structure.
3. The device of claim 1 , wherein
at least a part of the wall of the opening builds a positive angle with a plane that is substantially parallel to the upper surface of the substrate.
4. The device of claim 1 , wherein:
the first electrodes include a plurality of substantially parallel first electrodes,
the second electrodes include a plurality of substantially parallel second electrodes at an angle with the first electrodes,
the at least one insulating structure includes a plurality of elongated substantially parallel electrically insulating structures separating the second electrodes, and
the device includes an electroluminescent layer arranged between the first and second electrodes.
5. The device of claim 4 , wherein
electrically conductive material forms electrical leads on top of at least some of the insulating structures, and wherein at least some of these leads are electrically connected to a single first electrode.
6. A method comprising:
arranging a plurality of first electrodes over a substrate,
arranging at least one electrically insulating structure over the first electrodes,
arranging an intermediate layer over the first electrodes and beside the electrically insulating structure, and
arranging conductive material within an opening of the electrically insulating structure that extends from an upper surface of the electrically insulating structure to an electrode of the plurality of the first electrodes.
7. The method of claim 6 , including
depositing an electrically conductive material over the electrically insulating structure, thus forming a layer that contacts the first electrode beneath the structure.
8. The method of claim 6 , wherein
at least part of the opening is obtained by means of a sacrificial structure.
9. The method of claim 6 , wherein
at least a part of the wall of the opening builds a positive angle with a plane that is substantially parallel to the upper surface of the substrate.
10. The method of claim 9 , wherein;
the electrically insulating structure comprises a photoresist, and
the insulating structure and the opening are formed by means of a mask that includes a plurality of acute angles where the opening is to be formed.
11. The method of claim 10 , wherein
the photoresist is a negative photoresist.
12. A display device comprising:
a plurality of first electrodes arranged on a substrate,
a plurality of insulation structures arranged above the first electrodes, and
a plurality of second electrodes arranged between the insulation structures;
wherein
the insulation structures include openings that facilitate access to the first electrodes between the second electrodes.
13. The display device of claim 12 , including
an electroluminescent layer disposed between the insulation structures.
14. The display device of claim 12 , including
a plurality of conductive reads that are coupled to the first electrodes via the openings in the insulation structure.
15. The display device of claim 12 , wherein
at least a part of a wall of the openings builds a positive angle with a plane that is substantially parallel to the upper surface of the substrate.
16. The display device of claim 12 , including
an electroluminescent layer disposed between the first and second electrodes.
17. The display device of claim 12 , wherein
the plurality of first electrodes includes a parallel arrangement of elongated electrodes.
18. The display device of claim 17 , wherein
the plurality of insulation structures includes a parallel arrangement of elongated structures that are substantially orthogonal to the first electrodes.
19. The display device of claim 17 , wherein
the openings in the insulation structures are arranged in a staggered pattern along the elongated structures.
20. The display device of claim 19 , including
a plurality of conductive leads that are coupled to the first electrodes via the openings in the insulation structure.