Low-Dielectric OLED Encapsulation Composition for Touch Sensitivity
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Solution Overview
Problem
Organic light emitting devices are susceptible to degradation from external moisture and oxygen, which affects their performance and lifespan, and high-dielectric constant materials in encapsulation layers reduce touch sensitivity in capacitive touch panels.
Innovation Solution
A composition for encapsulation using photocurable monomers with low dielectric constants and a photopolymerization initiator, comprising specific (meth)acrylate monomers and a photopolymerization initiator, forms a protective layer with a dielectric constant of 2.65 or less, effectively blocking moisture and oxygen while improving touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer structure of organic and inorganic layers is used for encapsulation, then moisture and oxygen blocking performance is improved, but dielectric constant increases reducing touch sensitivity
Solution Approach 1:
The patent changes the dielectric constant parameter of the encapsulation material by using fluorinated compounds instead of conventional organic and inorganic layers. This parameter change achieves both low dielectric constant (2.65 or less) for improved touch sensitivity and effective moisture/oxygen blocking performance, resolving the contradiction between reliability and touch sensitivity.
Solution Approach 2:
The patent employs a composite fluorinated compound system comprising specific fluorinated cyclic compounds and fluorinated chain compounds. This composite material approach enables the encapsulation layer to simultaneously achieve low dielectric constant characteristics and high barrier performance against moisture and oxygen, thus resolving the technical contradiction.
2Reliability
If conventional encapsulation materials are used, then moisture and oxygen blocking is achieved, but touch sensitivity deteriorates due to high dielectric constant
Solution Approach 1:
The patent fundamentally changes the chemical composition and dielectric parameter of the encapsulation material by introducing fluorinated compounds. This parameter change reduces the dielectric constant to 2.65 or less while maintaining excellent moisture and oxygen blocking properties, thereby improving touch sensitivity without sacrificing protective function.
Solution Approach 2:
The patent creates a new class of fluorinated encapsulation materials that copy and enhance the desirable properties of both organic and inorganic layers while eliminating their high dielectric constant drawback. The fluorinated compound system replicates the protective function with superior electrical characteristics for touch sensitivity.
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 composition effectively blocks moisture and oxygen, ensuring the performance and lifespan of organic light emitting devices and enhances touch sensitivity in touch panels.
Implementation Method 1
a photocurable monomer including all (meth)acrylate monomers represented by the following chemical formulas 1, 2, 3, and 4; and a photopolymerization initiator
Data Source
Figure 1
AI summary
There is disclosed a composition for organic light emitting device encapsulation that has low dielectric constant characteristics of effectively blocking moisture or oxygen flowing into an organic light emitting display device from the outside, thereby ensuring the performance and lifespan of the organic light emitting device, and also improving touch sensitivity of a touch panel, and the organic light emitting display device including the same.