Multilayer Encapsulating Film for OLED Moisture Protection

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Solution Overview

Problem

Organic electronic devices, such as OLEDs, are vulnerable to moisture and oxygen, leading to issues like increased resistance and degradation due to oxidation at the electrode interface, which affects their emissive function and luminescence.

Innovation Solution

A method involving a laminated encapsulating film with a pressure-sensitive adhesive (PSA) first layer and a curable adhesive second layer, where the first layer has a lower elastic modulus than the second layer, incorporating a moisture scavenger to enhance moisture blocking properties, is used to protect the devices from external factors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single-layer encapsulating film is used, then the device structure is simple, but the moisture blocking property is insufficient

Engineering Contradiction:

Improvemoisture blocking propertyVSAvoidencapsulating film structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The encapsulating film is divided into multiple layers (first layer, second layer, and third layer) with different functions. The first layer provides adhesion, the second layer provides moisture blocking, and the third layer provides protection, thereby improving moisture blocking property while maintaining reasonable structural complexity

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent uses composite material structure where each layer is made of different materials optimized for specific functions. The first layer uses adhesive material, the second layer uses moisture-blocking material, and the third layer uses protective material, achieving superior moisture blocking through material composition rather than single material

Inventive Principle:

Principle #40Composite materials

2Area of stationary object

If the encapsulating film is applied to a large-scale device, then complete coverage is achieved, but bubbles may form during application

Engineering Contradiction:

Improveencapsulating film coverage areaVSAvoidbubble-free application

Core Design Contradiction:

Area of stationary objectVSManufacturing precision

Solution Approach 1:

The encapsulating film is segmented into multiple layers that can be applied sequentially. This allows each layer to be applied and adjusted separately, making it easier to eliminate bubbles during the application process while maintaining large-scale coverage

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs thin film structure for the encapsulating film that can conform to large-scale device surfaces. The flexible thin film nature allows for easier application without trapping bubbles, while still achieving complete coverage of large areas

Inventive Principle:

Principle #30Flexible shells and thin films

3Reliability

If a moisture scavenger is added to the encapsulating film, then moisture blocking property is enhanced, but the film may detach due to expansion stress

Engineering Contradiction:

Improvemoisture blocking propertyVSAvoidadhesive strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The moisture scavenger function is segregated into a specific layer (second layer) rather than distributed throughout all layers. This concentrates the moisture absorption function in one location, allowing other layers to maintain their adhesive and structural functions without being compromised by expansion stress

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent creates a composite structure where the second layer is specifically designed as a moisture scavenging layer with materials that absorb moisture without excessive expansion. This composite approach balances moisture blocking enhancement with maintaining adhesive strength by using materials and结构设计 that accommodate moisture absorption while preventing detachment

Inventive Principle:

Principle #40Composite materials

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 provides excellent moisture blocking and durability to the electronic devices, preventing degradation and maintaining their functional integrity.

Implementation Method 1

the first layer includes a pressure-sensitive adhesive (PSA) component

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

the encapsulating film includes first and second layers having different physical properties and/or components... incorporating a moisture scavenger to enhance moisture blocking properties

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 3

the second layer includes an adhesive composition... the second layer is in contact with the diode

Methodology Applied

Scientific EffectCuring:

Data Source

PatentEP2781570B1Method for manufacturing electronic device

Publication Date: 2023.08.30 LG CHEM LTD

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AI summary

Provided is a method of manufacturing an electronic device. An electronic device having excellent moisture blocking property and durability may be provided by the method.