Photocurable Encapsulation Composition for Moisture and Oxygen Blocking

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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 2.8 or less, effectively blocking moisture and oxygen while maintaining touch sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high-dielectric constant materials are used in encapsulation layers, then moisture and oxygen blocking performance is improved, but touch sensitivity is reduced due to polarization

Engineering Contradiction:
Improvemoisture and oxygen blocking performanceVSAvoidtouch sensitivity
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the dielectric constant parameter of the encapsulation material from high to low (2.8 or less), fundamentally altering the material property to eliminate polarization effects while maintaining protective function. This parameter change resolves the contradiction by selecting materials with low dielectric constants that do not cause polarization under external electric fields, thereby preserving touch sensitivity while still providing moisture and oxygen barrier protection.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent employs composite encapsulation structures combining organic and inorganic layers with specifically selected low-dielectric-constant materials. By composing the encapsulation layer from multiple materials with complementary properties (low dielectric constant, high barrier performance), the system achieves both moisture/oxygen blocking and maintained touch sensitivity, resolving the technical contradiction between protection and responsiveness.

Inventive Principle:
Principle #40Composite materials

2Reliability

If multi-layer structure of organic and inorganic layers is used, then moisture and oxygen blocking performance is improved, but device complexity increases

Engineering Contradiction:
Improvemoisture and oxygen blocking performanceVSAvoidencapsulation structure complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning specific functions to different layers: the organic layer provides flexibility and stress relief while the inorganic layer provides the primary barrier against moisture and oxygen. Each layer is optimized for its specific function rather than using uniform materials throughout, achieving effective protection while managing structural complexity through functional specialization.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The encapsulation structure is segmented into distinct organic and inorganic layers, each with specific compositions and functions. This segmentation allows independent optimization of each layer's properties (barrier performance, flexibility, dielectric constant) and simplifies the design process by breaking down the complex protection requirement into manageable functional segments that can be independently selected and combined.

Inventive Principle:
Principle #1Segmentation

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 composition for organic light emitting encapsulation may include a photocurable monomer including all (meth)acrylate monomers represented by the following chemical formulas 1, 2, 3, and 4; and a photopolymerization initiator

Methodology Applied
Scientific EffectPhotopolymerization: Photopolymerisation

Implementation Method 2

a dielectric constant may be 2.8 or less at a frequency in a range of 100 khz to 1MHz... effectively blocking moisture or oxygen flowing into an organic light emitting display device from the outside

Methodology Applied
Scientific EffectPermeation barrier: Permeation

Data Source

PatentEP4620989A1Composition for encapsulating organic light-emitting element and organic light-emitting display device comprising same
Publication Date: 2025.09.24 SOLUS ADVANCED MATERIALS CO LTD
  • EP4620989A1 patent drawingFigure 1
  • EP4620989A1 patent drawing
  • EP4620989A1 patent drawing

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.