OLED Encapsulation Layer Structure Against Plasma-Induced Dark Spots
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The degradation of display quality in display devices is caused by damage to the organic layer during the formation of the inorganic layer, leading to issues such as dark-spot defects.
Innovation Solution
Incorporating a second organic layer with a higher ring parameter and dielectric constant than the first organic layer, positioned between the first organic layer and the inorganic layer, to protect the first organic layer from plasma during the formation of the second inorganic layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inorganic layer is formed on the organic layer, then the encapsulation and protection function is improved, but the organic layer is damaged causing display quality degradation
Solution Approach 1:
A second organic layer with high ring parameter (0.15 or greater) is introduced as an intermediary protective layer between the first organic layer and the inorganic layer. This intermediate layer absorbs plasma damage during the formation process, preventing direct damage to the first organic layer while enabling successful encapsulation.
Solution Approach 2:
The second organic layer is formed in advance before the inorganic layer deposition process. This preliminary protective layer is specifically designed with high plasma resistance properties to withstand the upcoming plasma-based inorganic layer formation, preventing damage to the underlying first organic layer.
2Manufacturing precision
If a protective layer is added to prevent plasma damage, then display quality is improved, but the device structure becomes more complex
Solution Approach 1:
The second organic layer is strategically positioned only where plasma damage risk exists - between the first organic layer and the inorganic layer. This localized protective structure provides precise protection where needed without unnecessarily complicating the entire device architecture.
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
Prevents damage to the first organic layer, thereby maintaining display quality by securing plasma resistance and preventing dark-spot defects.
Implementation Method 1
the second organic layer may have a greater ring parameter than the first organic layer... to protect the first organic layer from plasma during the formation of the second inorganic layer
Data Source
AI summary
A display device includes a substrate, a first electrode disposed on the substrate, an organic light-emitting layer disposed on the first electrode, a second electrode disposed on the organic light-emitting layer, an encapsulation layer disposed on the second electrode, and a touch layer disposed on the encapsulation layer. The encapsulation layer includes a first inorganic layer, a first organic layer, a second organic layer, and a second inorganic layer. The first inorganic layer is disposed on the second electrode, the first organic layer is disposed on the first inorganic layer, the second organic layer is disposed on the first organic layer and has a greater ring parameter than the first organic layer, and the second inorganic layer is disposed on the second organic layer.