Fluoro-Polymeric Encapsulation Layer for OLED Bending Resistance
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Solution Overview
Problem
The existing encapsulation structures for organic light-emitting devices are prone to defects and limited in bending resistance due to the use of inorganic films, which can lead to reduced service life when exposed to moisture and oxygen.
Innovation Solution
A display panel with an encapsulation structure comprising a first inorganic layer for blocking moisture and oxygen, a fluoro-polymeric layer for enhanced moisture and oxygen blocking, and optionally a second inorganic layer, where the fluoro-polymeric layer provides improved ductility and bonding, reducing defects and thickness while maintaining effective moisture and oxygen blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation layer made of inorganic films (micron-sized silicon oxide and silicon oxynitride) is used, then moisture and oxygen blocking is achieved, but bending resistance is limited and the encapsulation layer is prone to be stripped
Solution Approach 1:
The patent employs a composite encapsulation structure combining inorganic films (silicon oxide, silicon oxynitride) with an organic film layer. This composite approach leverages the excellent moisture and oxygen blocking properties of inorganic materials while the organic layer provides flexibility and bending resistance, resolving the contradiction between protection and flexibility.
2Reliability
If the thickness of the encapsulation structure is increased to improve blocking performance, then moisture and oxygen blocking is enhanced, but bending resistance deteriorates
Solution Approach 1:
The patent utilizes thin film technology with a multi-layer structure where the organic film layer provides flexibility. This allows the encapsulation structure to maintain effective blocking performance through optimized thin-film design rather than increasing overall thickness, thus preserving bending resistance.
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 proposed solution enhances the bending resistance and flexibility of the organic light-emitting device while ensuring effective moisture and oxygen blocking, potentially extending the service life and reducing the thickness of the encapsulation structure.
Implementation Method 1
a fluoro-polymeric layer for blocking moisture and oxygen sequentially arranged on the light-emitting device
Implementation Method 2
a first inorganic layer for blocking moisture and oxygen
Data Source
AI summary
A display panel includes a light-emitting device on a substrate and an encapsulation structure on a light output surface on one side of the light-emitting device. The encapsulation structure includes a first inorganic layer and a fluoro-polymeric layer. Ductility and bending resistance of the fluoro-polymeric layer are greater than those of the first inorganic layer. Defects between the fluoro-polymeric layer and the first inorganic layer are fewer than those between the first inorganic layer and another layer.