Organic Layer Conductive Regions Prevent Galvanic Corrosion
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Solution Overview
Problem
Display devices face challenges in preventing galvanic phenomena between electrodes, leading to increased resistance and potential damage during manufacturing processes, particularly when exposed to developing agents.
Innovation Solution
The implementation of an organic layer with conductive regions and an insulating region, where the organic layer includes PEDOT:PSS and conductive particles like silver nanowires or graphene, covers the electrodes, preventing exposure and reducing the occurrence of galvanic phenomena by forming conductive connections without exposing the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes are exposed during manufacturing processes, then electrical connectivity can be established, but galvanic phenomena occur leading to increased resistance and potential damage
Solution Approach 1:
The patent introduces an organic layer as an intermediary substance between the first and second electrodes. This organic layer includes conductive regions that provide electrical connectivity while preventing direct contact between the electrodes and developing agents, thereby eliminating the galvanic phenomenon. The organic layer acts as a mediator that maintains electrical function while protecting against harmful chemical interactions.
Solution Approach 2:
The organic layer is composed of composite materials including PEDOT:PSS and conductive particles such as silver nanowires or graphene. This composite structure provides both electrical conductivity through the conductive particles and protective properties through the PEDOT:PSS matrix, allowing the layer to simultaneously enable electrical connectivity and prevent galvanic corrosion.
2Reliability
If electrodes are covered to prevent galvanic corrosion, then reliability improves, but manufacturing complexity increases due to additional organic layer formation steps
Solution Approach 1:
The organic layer is not uniformly applied across all electrode surfaces, but rather forms conductive regions with specific local properties. The layer has different characteristics in different areas: conductive regions for electrical connectivity and insulating regions for protection, allowing tailored functionality in different locations without increasing overall device complexity.
Solution Approach 2:
The organic layer serves multiple functions simultaneously: it provides electrical connectivity through conductive regions, prevents galvanic corrosion by isolating electrodes from developing agents, and maintains structural integrity. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving comprehensive protection.
3Reliability
If conductive particles are added to the organic layer, then electrical conductivity improves, but surface roughness increases affecting manufacturing precision
Solution Approach 1:
The patent optimizes parameters such as the concentration of conductive particles (1-10 wt%), the molecular weight of PEDOT:PSS, and the processing conditions to achieve a balance between electrical conductivity and surface smoothness. By carefully controlling these parameters, the organic layer provides sufficient conductivity while maintaining surface quality suitable for manufacturing requirements.
Solution Approach 2:
The organic layer is formed as a thin film that encapsulates the conductive particles within a smooth matrix. This thin film structure allows the conductive particles to be distributed throughout the layer without creating significant surface roughness, as the PEDOT:PSS matrix provides a smooth outer surface while maintaining internal conductivity pathways.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces the risk of galvanic corrosion and increases the resistance between electrodes, enhancing the reliability and durability of the display device by protecting the electrodes from developing agents and maintaining electrical connectivity.
Implementation Method 1
the organic layer including a plurality of conductive regions and an insulating region, light-emitting elements on the organic layer and on the first and second electrodes, and a first connecting electrode connected to first end portions of the light-emitting elements and one of the plurality of conductive regions
Implementation Method 2
a surface roughness of the insulating region is greater than a surface roughness of the plurality of conductive regions
Data Source
AI summary
A display device comprises first and second electrodes extending in one direction on a substrate, the first and second electrodes being spaced apart from each other, an organic layer on the first and second electrodes, the organic layer including a plurality of conductive regions and an insulating region, light-emitting elements on the organic layer and on the first and second electrodes, and a first connecting electrode coupled to first end portions of the light-emitting elements and one of the plurality of conductive regions, and a second connecting electrode coupled to second end portions of the light-emitting elements and another one of the plurality of conductive regions, wherein the organic layer includes PEDOT:PSS, and a surface roughness of the insulating region is greater than a surface roughness of the plurality of conductive regions.