Electrode Sidewall Polymer Barrier for Corrosion-Resistant Displays
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Solution Overview
Problem
Existing display devices face challenges in maintaining the reliability of light-emitting elements due to corrosion from etching processes, particularly from chlorine anions and radicals, which affect the integrity of electrodes and overall device performance.
Innovation Solution
Incorporating a fluorine-based polymer barrier layer that entirely covers the side surfaces of electrodes and light-emitting elements, formed concurrently with the electrodes during the manufacturing process using a fluorine-based gas etching process, to protect against corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a chlorine-based etching process is used to form electrodes, then manufacturing precision is improved, but the electrodes become susceptible to corrosion from chlorine anions and radicals, worsening reliability
Solution Approach 1:
A polymer barrier layer is introduced as an intermediary substance between the chlorine-based etching environment and the electrode. This barrier layer selectively protects the electrode from chlorine anion and radical corrosion while allowing the etching process to proceed with high precision. The barrier layer acts as a mediator that enables the beneficial effects of chlorine-based etching while blocking its harmful corrosive effects on the electrode.
Solution Approach 2:
The polymer barrier layer creates an inert protective environment around the electrode during the chlorine-based etching process. By forming a protective coating that is chemically inert to chlorine anions and radicals, the barrier layer effectively isolates the electrode from the corrosive etching environment, allowing precise electrode formation without compromising reliability.
2Reliability
If a barrier layer is added to protect electrodes from corrosion, then reliability is improved, but device complexity increases due to additional manufacturing steps
Solution Approach 1:
The formation of the polymer barrier layer is merged with the existing electrode formation process. The barrier layer is formed concurrently with the electrode structure during the same manufacturing sequence, rather than as a separate subsequent step. This integration reduces overall process complexity while maintaining the protective function that improves reliability.
Solution Approach 2:
The polymer barrier layer is formed preliminarily, before the electrode is fully exposed to the corrosive environment. By establishing the protective barrier in advance during the electrode formation process, the design prevents corrosion issues before they can occur, eliminating the need for additional protective steps later in manufacturing.
3Reliability
If the barrier layer covers only partial surfaces of electrodes, then manufacturing complexity is reduced, but corrosion protection is insufficient, worsening reliability
Solution Approach 1:
The polymer barrier layer is designed with universal coverage, extending to entirely cover the side surfaces of the electrodes. This comprehensive coverage approach ensures that all surfaces of the electrode that could be exposed to corrosive chlorine anions and radicals are protected. The multi-functional barrier layer simultaneously protects against corrosion from multiple directions while maintaining a relatively simple structural design.
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
The fluorine-based polymer barrier layer effectively shields electrodes from chlorine-induced corrosion, enhancing the reliability and integrity of the display device by preventing damage during manufacturing processes.
Implementation Method 1
a barrier layer entirely covering a side surface of the lower electrode, and including a polymer
Implementation Method 2
corrosion from etching processes, particularly from chlorine anions and radicals
Data Source
AI summary
A display device a substrate, a driving element above the substrate, a lower electrode above the driving element, a barrier layer entirely covering a side surface of the lower electrode, and including a polymer, and a light-emitting element above the lower electrode.