Electrical device with crossover of electrode connecting lines
View Patent ↗The invention relates to an electrical device comprising a substrate carrying at least one component comprising at least one electrode, a first connecting line electrically connected to said electrode, wherein the first connecting line bridges a second connecting line by means of a crossover. The crossover is, at least at one side, bounded by an electrically insulating structure. The invention allows new testing methods and efficient lead-outs for an electrical device, such as electroluminescent display devices.
1. A method for manufacturing an electrical device comprising a crossover of at least a first connecting line over at least a second connecting line, at least one of said connecting lines connecting to an electrical device, the method comprising:
forming said first connecting line and said second connecting line on a substrate;
depositing an insulating layer on said first connecting line and said second connecting line, at least in an area where said crossover is to be formed;
creating an opening in said insulating layer in a position where an electrical contact is to be provided between said first connecting line and a connection point;
forming an electrically insulating structure peripherally surrounding at least a portion of the area where said crossover is to be formed; and
depositing an electrically conductive layer on the insulating layer to connect said first connecting line to said connecting point, which connecting point may be connected to another second connecting line.
2. The method of claim 1 , wherein said electrically insulating structure is formed so as to extend in a direction substantially perpendicular to said substrate and to comprise at least one overhanging portion projecting in a direction substantially parallel to the surface of said substrate.
3. The method of claim 1 , wherein said electrically insulating structure surrounds the crossover.
4. The method of claim 1 , wherein said electrical device is an electroluminescent display device having at least one display pixel comprising a first electrode, an electroluminescent material and a second electrode, said method further comprising:
forming said first electrode simultaneously with said first connecting line and said second connecting line;
forming an electroluminescent layer on said first electrode, at least at a position where the at least one display pixel is to be formed; and
forming said second electrode simultaneously with said electrically conductive layer, at least at the position where said display pixel is to be formed, so as to connect said first or second electrode with said first connecting line.
5. The method of claim 4 , further comprising:
forming said electroluminescent layer after forming said electrically insulating structure.
6. The method of claim 1 , wherein said electrical device is an integrated circuit and said first connecting line is connected to said integrated circuit.
7. The method of claim 6 , wherein said integrated circuit is made on a glass substrate.
8. The method of claim 1 , wherein the first and second connecting lines are formed simultaneously.
9. The method of claim 1 , wherein the first and second connecting lines are formed successively.