OLED Encapsulation Structure Using Adhesive-Sealed Barrier Layers
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Solution Overview
Problem
Organic light-emitting devices (OLEDs) face challenges with long-term stability due to environmental sensitivity to moisture and oxygen, which degrades device performance.
Innovation Solution
An encapsulation structure comprising a first and second barrier layer with an adhesive connecting them to seal an electroluminescence device, using barrier materials and adhesives to prevent moisture and oxygen ingress, and optionally incorporating a getter material and graded ultra-high barrier coating to enhance protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OLEDs are exposed to environmental conditions, then device operation is enabled, but moisture and oxygen ingress degrades device performance and stability
Solution Approach 1:
The encapsulation structure is divided into multiple functional layers: a first barrier layer, a second barrier layer, and an adhesive layer connecting them. This segmentation allows each layer to perform its specific function (moisture/oxygen barrier vs. mechanical bonding) optimally, creating a comprehensive protection system that addresses the harmful environmental factors.
Solution Approach 2:
The invention uses composite encapsulation structures combining different materials with complementary properties. The barrier layers provide moisture and oxygen resistance, while the adhesive layer provides mechanical bonding. This composite approach creates a unified encapsulation system that simultaneously addresses both protection and structural integrity requirements.
2Object-affected harmful factors
If barrier layers are added to protect OLEDs, then protection against moisture and oxygen is improved, but device structure complexity increases
Solution Approach 1:
The adhesive layer serves multiple functions simultaneously: it mechanically bonds the first and second barrier layers together, provides additional barrier properties, and seals the lateral sides of the OLED. This multi-functionality reduces the need for separate components, simplifying the overall structure while maintaining comprehensive protection.
Solution Approach 2:
The invention merges the bonding function and barrier function into a single integrated encapsulation structure. The adhesive layer is not just a connector but also contributes to the barrier properties, combining multiple protective functions into one unified system that reduces structural complexity.
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 encapsulation structure effectively prevents moisture and oxygen from reaching the OLED, significantly improving its long-term stability and durability, as demonstrated by surviving 2500 hours of temperature and humidity testing without significant degradation.
Implementation Method 1
an adhesive configured to locate between and connect the first and second barrier layers, and at least to be coupled to the lateral side of the electroluminescence device to seal the electroluminescence device between the first and second barrier layers
Implementation Method 2
The encapsulation structure effectively prevents moisture and oxygen from reaching the OLED, significantly improving its long-term stability and durability
Data Source
AI summary
An encapsulation structure comprises a first barrier layer, and an electroluminescence device configured to be coupled to the first barrier layer and comprising a substrate and an electroluminescence element both defining a lateral side. The electroluminescence element comprises a first electrode disposed on the substrate, a second electrode, and an organic light-emitting layer disposed between the first and second electrodes. Further, the encapsulation structure comprises a second barrier layer configured to be coupled to the electroluminescence device, and an adhesive configured to locate between and connect the first and second barrier layers, and at least to be coupled to the lateral side of the electroluminescence device to seal the electroluminescence device between the first and second barrier layers. An encapsulation method is also presented.