OLED Packaging Absorbing Layer Oxygen Water Vapor Barrier
Solution Overview
Problem
The poor barrier properties of adhesives like epoxy resin in OLED packaging lead to short service life due to oxygen and moisture erosion, as they fail to effectively isolate the organic electroluminescent devices.
Innovation Solution
A display panel design incorporating an absorbing layer with a photocatalytic layer for water decomposition and an oxygen-absorbing layer, along with a hydrogen-absorbing layer, to actively consume and isolate oxygen and water vapor, using semiconductor photocatalytic materials and metal-organic frameworks, respectively, to extend the device's lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive such as epoxy resin is used to seal the substrate and cover, then the OLED can be packaged, but the barrier properties to oxygen and water vapor are poor, resulting in short service life
Solution Approach 1:
The packaging structure is segmented into multiple functional layers: the adhesive layer for sealing, the oxygen barrier layer for blocking oxygen, and the water vapor barrier layer for preventing moisture penetration. This segmentation allows each layer to specialize in addressing specific harmful factors, thereby improving overall protection without relying on a single adhesive material to provide all barrier functions.
Solution Approach 2:
The patent employs composite material structures where the oxygen barrier layer and water vapor barrier layer are combined with the adhesive layer to form a multi-layer packaging system. This composite approach leverages the complementary properties of different materials to achieve superior barrier performance against both oxygen and water vapor, resolving the limitation of using adhesive alone.
2Ease of manufacture
If simple adhesive sealing is used, then the packaging process is simple, but the barrier properties to oxygen and water vapor are insufficient
Solution Approach 1:
The packaging process is segmented into distinct steps: applying the adhesive layer for sealing, depositing the oxygen barrier layer, and depositing the water vapor barrier layer. This segmentation allows each functional layer to be optimized and applied using appropriate techniques, maintaining manufacturing simplicity while achieving superior barrier properties through the coordinated action of multiple specialized layers.
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 solution effectively prevents corrosion by actively absorbing and decomposing oxygen and water vapor, ensuring the stability and longevity of the organic electroluminescent devices by creating a robust barrier against environmental contaminants.
Implementation Method 1
a photocatalytic layer for catalyzing water decomposition
Implementation Method 2
an oxygen absorbing layer covering the photocatalytic layer and the substrate around the photocatalytic layer
Data Source
AI summary
The present disclosure provides a display panel including a substrate, an organic electroluminescent device, and an absorbing layer, wherein the organic electroluminescent device is arranged on the substrate, and the absorbing layer covers the organic electroluminescent device and the substrate. The absorbing layer includes an oxygen absorbing layer and a photocatalytic layer for catalyzing water decomposition, the photocatalytic layer covers the organic electroluminescent device and the substrate around the organic electroluminescent device, and the oxygen absorbing layer is covered on the photocatalytic layer and the substrate around the photocatalytic layer.