Display Electrode Layout With Dummy Overlap to Mask Dark Spots
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Solution Overview
Problem
Display devices face issues with visible dark spots due to breakage of connection electrodes, which can lead to display defects and driving failures of light emitting elements.
Innovation Solution
The implementation of a display device structure that includes a substrate with parallel first and second electrodes, light emitting elements, insulating layers, and connection electrodes, where dummy electrodes are strategically placed to overlap the connection electrodes and are electrically insulated from them, reducing the visibility of dark spots even if the connection electrodes break.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection electrodes are made visible to ensure proper electrical connection, then electrical connectivity is improved, but dark spots become visible when connection electrodes break
Solution Approach 1:
A dummy electrode is introduced as an intermediary element that overlaps the connection electrode in the thickness direction. This dummy electrode serves as a visual placeholder that masks the appearance of broken connection electrodes, preventing dark spots from becoming visible while maintaining the actual electrical connectivity function of the original connection electrode.
2Object-affected harmful factors
If dummy electrodes are added to mask broken connection electrodes, then visibility of dark spots is reduced, but device structure becomes more complex
Solution Approach 1:
The dummy electrode is merged with the existing electrode structure by positioning it to overlap the connection electrode in the thickness direction. This integration approach adds the masking function without creating a completely separate structural element, thereby minimizing the increase in device complexity while achieving the goal of reducing dark spot visibility.
3Reliability
If connection electrodes are made robust to prevent breakage, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The dummy electrode is pre-positioned to overlap the connection electrode before the connection electrode is subjected to stress or breakage. This preliminary placement ensures that even if the connection electrode breaks later, the dummy electrode is already in position to mask the breakage, reducing the need for overly robust connection electrode designs that would require higher manufacturing precision.
Data Source
AI summary
A display device including a substrate, a first electrode and a second electrode on the substrate, extending parallel to each other along a first direction, and spaced from each other in a second direction intersecting the first direction, a plurality of light emitting elements on the first electrode and the second electrode, a first insulating layer partially covering upper surfaces of the light emitting elements, a first connection electrode on the plurality of light emitting elements and the first insulating layer, the first connection electrode being in contact with an end of each of the plurality of light emitting elements, a second insulating layer on the first connection electrode, a second connection electrode on the second insulating layer, the second connection electrode being in contact with an other end of each of the plurality of light emitting elements, and a first dummy electrode overlapping the first connection electrode.