Transparent Resin Composition for Organic EL Sealing

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Solution Overview

Problem

Existing sealing methods for organic electroluminescence elements fail to effectively block moisture and maintain flexibility, leading to dark spot generation and reduced visibility in organic EL devices.

Innovation Solution

A transparent resin composition comprising a thermoplastic resin, a tackifying resin, and an organic metallic compound, specifically a styrene-based A-B-A type triblock copolymer and a hydride of petroleum resin, with a desiccating agent, which provides high light transmittance and low moisture permeability while maintaining flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a transparent sealing board made of glass is used to block moisture, then moisture blocking effect is improved, but flexibility is lost

Engineering Contradiction:

Improvemoisture blocking effectVSAvoidflexibility

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent uses a transparent resin sheet as a flexible sealing film instead of rigid glass, allowing the sealing structure to maintain both moisture blocking capability and flexibility for conformal attachment to curved or flexible substrates

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The transparent resin sheet is formed from a composite composition containing thermoplastic resin, acrylic resin, and silicone resin, combining the advantages of each material to achieve simultaneous transparency, moisture resistance, and flexibility

Inventive Principle:

Principle #40Composite materials

2Reliability

If a viscous material containing dehydrating agent is used to seal the element, then moisture blocking effect is improved, but device complexity increases due to requirement of dam material

Engineering Contradiction:

Improvemoisture blocking effectVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the dehydrating agent function from a separate viscous filling material and integrates it into the transparent resin sheet itself, eliminating the need for separate dam structures while maintaining moisture blocking capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The transparent resin sheet simultaneously serves as the sealing structure, the moisture barrier, and the dehydrating agent carrier, consolidating multiple functions into a single component that simplifies the overall device structure

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If a thermoplastic resin sealant is used to produce flexible organic EL device, then flexibility is improved, but moisture blocking effect becomes insufficient

Engineering Contradiction:

ImproveflexibilityVSAvoidmoisture blocking effect

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent creates a composite resin system combining thermoplastic resin for flexibility, acrylic resin for transparency and adhesion, and silicone resin for moisture resistance, achieving all three properties simultaneously rather than sacrificing moisture blocking for flexibility

Inventive Principle:

Principle #40Composite materials

4Reliability

If sealing material is used to block moisture, then moisture blocking effect is improved, but transparency decreases

Engineering Contradiction:

Improvemoisture blocking effectVSAvoidlight transmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent optimizes the chemical composition parameters of the resin system, specifically the ratios of thermoplastic resin (10-50 parts), acrylic resin (30-60 parts), and silicone resin (10-30 parts), to achieve the optimal balance between moisture blocking performance and light transmittance exceeding 85%

Inventive Principle:

Principle #35Parameter changes

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 resin composition effectively blocks moisture, suppresses dark spot generation, and maintains transparency and flexibility, ensuring improved visibility and durability of organic EL devices regardless of light emission type.

Implementation Method 1

a space formed between the organic EL element and the sealing board is filled with a viscous material containing a dehydrating agent

Methodology Applied

Scientific EffectDesiccation: Desiccation

Data Source

PatentUS9758690B2Transparent resin composition for sealing organic electroluminescence element, resin sheet for sealing organic electroluminescence element, and apparatus for displaying image

Publication Date: 2017.09.12 FURUKAWA ELECTRIC CO LTD

AI summary

A transparent resin composition for sealing an organic EL element and other things having a sufficient effect of blocking moisture and excellent flexibility is provided. As essential components, a thermoplastic resin, tackifying resin and organometallic compound represented by the following chemical formula are included, having a light transmittance of 85% or more, and having a relationship of AM/Y<162,A: the acid value excluding the organometallic compoundM: the weight average molecular weight of the organometallic compoundY: the weight ratio of the organometallic compound with respect to 100 parts by weight of resin componentswherein the thermoplastic resin contains a hydride of a styrene-based A-B-A type triblock, wherein R1 to R4 represent organic groups including an alkyl group, aryl group, alkoxy group, cycloalkyl group and acyl group, each having a carbon number of 1 or more and 8 or less, M represents a metal atom having 3 valency.