Transparent Electrode Layout for Residue-Resistant Micro Displays
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Solution Overview
Problem
As display devices are miniaturized, the risk of short circuits due to residues generated in the manufacturing process increases, necessitating a method to prevent such occurrences.
Innovation Solution
The display device includes a display element layer with an anode and cathode electrodes spaced apart, an overcoat pattern covering them, and transparent electrodes connecting the element electrodes, featuring a line electrode and branch electrodes with specific spacing and overlap configurations to manage residue patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If display devices are miniaturized to reduce pixel size and distance between pixels, then display resolution and compactness are improved, but the risk of short circuits due to manufacturing residues increases
Solution Approach 1:
The cathode transparent electrode is divided into a line electrode extending in the second direction and multiple branch electrodes extending in the first direction from the line electrode. This segmentation creates a distributed electrode structure that reduces the probability of residues causing short circuits between adjacent anode and cathode electrodes, while maintaining electrical connectivity to the light emitting elements.
Solution Approach 2:
The patent applies different spatial configurations to different parts of the electrode structure. The line electrode is positioned to not overlap the overcoat pattern in plan view, while branch electrodes are positioned to overlap the overcoat pattern. This local differentiation optimizes both electrical connectivity and residue management in different regions of the display element layer.
2Reliability
If transparent electrodes are positioned to ensure electrical connectivity between element electrodes and main electrodes, then electrical performance is improved, but the risk of overlap with residue patterns causing short circuits increases
Solution Approach 1:
The electrode structure utilizes two orthogonal directions (first direction and second direction) to achieve electrical connectivity. The line electrode extends in the second direction to connect multiple branch electrodes, which in turn extend in the first direction to reach individual light emitting elements. This two-dimensional arrangement provides redundant connectivity paths that maintain electrical performance while reducing short circuit risk.
Solution Approach 2:
The overcoat pattern serves as an intermediary layer that spatially separates the anode transparent electrode and cathode transparent electrode in regions where residues might form. By positioning the line electrode to not overlap the overcoat pattern while branch electrodes do overlap it, the structure uses the overcoat as a protective mediator that prevents direct contact between opposing electrodes even when residues are present.
Data Source
AI summary
A display device includes a display element layer on a substrate. The display element layer includes an anode electrode, a cathode electrode, an overcoat pattern, a light emitting element including first and second element electrodes, an anode transparent electrode electrically connecting the first and second element electrodes to each other, and a cathode transparent electrode that electrically connects the second element electrode and the cathode electrode to each other. The cathode transparent electrode includes a line electrode extending in a second direction intersecting a first direction, and a branch electrode extending in the first direction from the line electrode. The first and second element electrodes are spaced apart from each other at a first distance in the first direction, and the anode transparent electrode and the branch electrode are spaced apart from each other at a second distance greater than or equal to the first distance in the first direction.