Display Electrode Layout With Dummy Patterns for Contact Isolation
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Solution Overview
Problem
Display devices are prone to contact defects due to lower stepped portions in the electrode arrangement, leading to electrical connectivity issues.
Innovation Solution
The display device incorporates a specific electrode arrangement structure with alternating first and second electrodes, via layers, and voltage lines to prevent contact defects by spacing and connecting electrodes through contact holes, using dummy patterns to avoid direct electrical connections at stepped portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrodes are arranged in a stepped portion structure, then device integration is improved, but contact defects occur due to electrical connectivity issues
Solution Approach 1:
A dummy pattern is introduced as an intermediary element between the first electrode and the second electrode at the stepped portion. This dummy pattern prevents direct electrical connection between electrodes at the stepped portion, thereby eliminating contact defects while maintaining the integrated electrode arrangement structure.
Solution Approach 2:
The electrode arrangement is segmented into distinct components: first electrode, dummy pattern, and second electrode. By separating the electrode connection path and introducing the dummy pattern as a distinct segment, the patent prevents direct contact defects while maintaining electrical connectivity through controlled pathways.
2Area of stationary object
If voltage lines are placed close to electrodes, then device area is reduced, but electrical isolation becomes difficult at stepped portions
Solution Approach 1:
The dummy pattern serves as an intermediary that provides electrical isolation between voltage lines and electrodes at stepped portions. This allows voltage lines to be positioned closer to electrodes for area reduction while the dummy pattern maintains proper electrical isolation where needed.
Data Source
AI summary
A display device comprises electrode patterns spaced apart from each other in a first direction; a via layer disposed on the electrode patterns; first electrodes, each of the first electrodes partially overlapping an electrode pattern of the electrode patterns on the via layer in a plan view and extending in a second direction intersecting the first direction; second electrodes, each of the second electrodes comprising a portion extending in the second direction, the first electrodes and the second electrodes being spaced apart from each other and alternately disposed with each other; and light emitting elements disposed on a first electrode of the first electrodes and a second electrode of the second electrodes. The first electrodes are in contact with the electrode patterns through first electrode contact holes penetrating the via layer, and the first electrode contact holes are spaced apart from each other in the first direction.