Display Electrode Isolation via Dummy Patterns
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Solution Overview
Problem
Display devices face challenges in preventing short circuits between electrodes due to residues, which can lead to performance issues and device failure.
Innovation Solution
The design incorporates a display device with a specific arrangement of electrodes and dummy patterns, where the vertical distance between dummy patterns is greater than the gap between electrodes, and these patterns are positioned to avoid overlapping with contact electrodes, thereby preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrodes are arranged closely to increase pixel density, then productivity and display resolution are improved, but the risk of short circuits between electrodes due to residues increases
Solution Approach 1:
The patent introduces a bank structure as an intermediary element positioned between adjacent electrodes. This bank acts as a physical barrier and isolation structure that prevents direct contact between electrodes, thereby eliminating the short circuit risk while allowing electrodes to maintain close spacing for high pixel density. The bank serves as a mediating structure that enables both high density and reliability simultaneously.
2Reliability
If dummy patterns are added to prevent short circuits, then reliability is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent merges the dummy pattern function with the bank structure. Instead of adding separate dummy patterns as additional elements, the bank itself is designed to serve both as a structural support element and as the dummy pattern that provides electrical isolation. This integration eliminates the need for separate dummy pattern fabrication steps, maintaining reliability while reducing device complexity and manufacturing complexity.
Solution Approach 2:
The bank structure is designed to perform multiple functions simultaneously: it serves as a structural support for the electrode, provides electrical isolation between adjacent electrodes, and acts as the dummy pattern for short circuit prevention. This multi-functionality reduces the overall number of components needed in the device, simplifying the structure while maintaining reliability.
Data Source
AI summary
A display device comprises an emission area and a sub area disposed on a side of the emission area and spaced apart from the emission area, electrodes disposed in the emission area and spaced apart from each other in a first direction and a second direction intersecting the first direction, the electrodes extending in the second direction, and light emitting elements having ends disposed on the electrodes spaced apart in the first direction. The emission area comprises a first area where some of the electrodes are spaced apart from each other in the second direction, and first dummy patterns disposed in the first area and spaced apart from the electrodes in the second direction.