OLED Panel Wire Flatness via Work Function Mediator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light-emitting display panels face issues with poor flatness and low reliability due to metal particles adhering to the metal wire surface during the manufacturing process, caused by silver ions forming in acid etching solutions, which affects the flatness of subsequent film layers and overall panel reliability.
Innovation Solution
Incorporating a conductive portion with a higher work function than the metal wire and silver, electrically connected to the metal wire, to prevent silver ions from forming metal particles on the wire surface by facilitating their reduction on the conductive portion instead, maintaining a smooth and flat surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal wire is used in the display panel, then electrical conductivity is improved, but metal particles form on the wire surface during manufacturing causing poor flatness
Solution Approach 1:
A conductive portion made of material with higher work function than silver is introduced as an intermediary element. This conductive portion is electrically connected to the metal wire and serves as a mediator to attract silver ions away from the metal wire surface during acid etching, preventing metal particle formation while maintaining electrical conductivity.
Solution Approach 2:
The work function parameter of the conductive material is specifically selected to be higher than that of silver. This parameter change creates a favorable electrochemical environment where silver ions preferentially migrate to the conductive portion rather than depositing on the metal wire surface, thereby solving the flatness issue.
2Ease of manufacture
If acid etching solution is used in manufacturing, then film layer processing is improved, but silver ions form and adhere to metal wire surface
Solution Approach 1:
The harmful silver ions generated during acid etching are converted into a beneficial effect. By providing a conductive portion with higher work function, the silver ions are attracted to and deposit on this portion instead of the metal wire, transforming the harmful deposition effect into a controlled and localized process that benefits the overall manufacturing.
3Manufacturing precision
If conductive portion is added to prevent metal particle formation, then flatness is improved, but device structure becomes more complex
Solution Approach 1:
The conductive portion is merged with the existing metal wire structure through electrical connection. Rather than adding a completely separate component, the solution integrates the protective function into the existing conductive network, minimizing structural complexity while achieving the desired flatness improvement.
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 enhances the reliability and flatness of the organic light-emitting display panel by preventing metal particle formation on the wire surface, thereby improving the manufacturing process yield and reducing production costs.
Implementation Method 1
A work function of a material of the conductive portion is G1, a work function of metal silver is G2, a work function of the first metal is G3, and G1>G2>G3
Implementation Method 2
prevent silver ions from forming metal particles on the wire surface by facilitating their reduction on the conductive portion instead
Data Source
AI summary
An organic light-emitting display panel, a display device, and an organic light-emitting display motherboard are provided. The organic light-emitting display panel includes a base substrate, a metal wire, a first insulation layer, and a conductive portion. The metal wire has an upper surface opposing to the base substrate. A material of the metal wire includes a first metal. The first insulation layer covers the upper surface of the metal wire and includes at least one hollow portion penetrating through the first insulation layer and exposing a portion of the upper surface of the metal wire. The conductive portion is electrically connected to the metal wire, and is not overlapped with the at least one hollow portion. A work function of a material of the conductive portion is G1, a work function of metal silver is G2, a work function of the first metal is G3, and G1>G2>G3.