Electrical Device Crossover Insulation for High-Resolution Displays
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Solution Overview
Problem
The manufacturing process of electroluminescent elements and integrated circuits is not suitable for high-resolution applications, leading to a high risk of short-circuits between adjacent connecting lines due to the standard cathode-making process used for forming cathodes, connecting lines, and crossovers simultaneously.
Innovation Solution
The use of electrically insulating structures to bound crossovers, ensuring electrical separation and reducing the risk of short-circuits, allowing for high-density crossover and connecting line configurations necessary for high-resolution display panels, while still permitting the standard cathode-making process for forming cathodes, connecting lines, and crossovers in one step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the standard cathode-making process is used for simultaneously forming cathodes, connecting lines and crossovers, then the manufacturing process is simple and efficient, but the risk of short-circuit between adjacent connecting lines increases substantially
Solution Approach 1:
The patent divides the cathode layer into multiple segments: a first cathode layer portion, a second cathode layer portion, and an intermediate layer between them. This segmentation allows the intermediate layer to provide electrical insulation at the crossover region, preventing short-circuits while maintaining the simplicity of the standard cathode-making process for forming all components simultaneously.
Solution Approach 2:
The intermediate layer acts as an intermediary element between the first and second cathode layer portions. It provides the necessary electrical insulation at the crossover region, enabling the connecting lines to cross without electrical contact while maintaining process simplicity through simultaneous formation with the cathodes.
2Manufacturing precision
If the electrode pitch is scaled down for high-resolution applications, then the display resolution is improved, but the risk of short-circuit between adjacent connecting lines increases
Solution Approach 1:
By segmenting the cathode layer with an intermediate insulating layer at crossover regions, the patent enables smaller electrode pitches for high-resolution displays while maintaining electrical isolation between adjacent connecting lines, thus preventing short-circuits even at reduced pitch dimensions.
Solution Approach 2:
The intermediate layer provides localized electrical insulation specifically at the crossover regions where connecting lines intersect, allowing the overall electrode pitch to be reduced for high resolution while maintaining reliability only where needed to prevent short-circuits.
3Productivity
If crossovers are placed close to each other for high-density configurations, then the display resolution is improved, but the risk of short-circuit between adjacent connecting lines increases
Solution Approach 1:
The segmentation of the cathode layer with intermediate insulating layers between adjacent crossovers enables high-density crossover configurations while maintaining electrical isolation. Each crossover region is independently insulated, allowing crossovers to be placed close together without increasing short-circuit risk.
Data Source
AI summary
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.