Organic EL Panel Moisture Barrier via Inorganic Intermediary

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Solution Overview

Problem

The absorption of moisture by partition walls in organic electroluminescent panels can lead to failures in the organic electroluminescent elements during the manufacturing process, as existing methods do not effectively prevent moisture from reaching the light-emitting layers.

Innovation Solution

Incorporating a protective layer with lower moisture permeability than the partition walls, specifically a hole injection layer made of inorganic materials, between the partition walls and the organic light-emitting layer, which prevents moisture from permeating and reaching the light-emitting layer, thereby reducing the risk of degradation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If partition walls are made of organic material to define pixel regions, then ease of manufacture is improved, but moisture absorption occurs leading to element failure

Engineering Contradiction:

Improveease of manufactureVSAvoidreliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

An inorganic protective layer is introduced as an intermediary between the organic partition wall and the organic light-emitting layer. This protective layer acts as a mediator that blocks moisture diffusion from the partition wall to the light-emitting layer, preventing moisture-induced failures while maintaining the manufacturing simplicity of organic partition walls.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The structure combines organic materials (partition wall, light-emitting layer) with an inorganic protective layer to create a composite system. This composite structure leverages the manufacturing advantages of organic materials while incorporating the moisture barrier properties of inorganic materials, resolving the contradiction between ease of manufacture and reliability.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If partition walls are made of organic material, then ease of manufacture is improved, but moisture permeability increases causing element failure

Engineering Contradiction:

Improveease of manufactureVSAvoidmoisture permeability

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The inorganic protective layer serves as a moisture-blocking intermediary positioned between the moisture-prone organic partition wall and the moisture-sensitive organic light-emitting layer, effectively preventing moisture transmission while allowing the organic partition wall structure to be maintained for ease of manufacture.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protective layer is selectively applied only where needed - between the partition wall and the light-emitting layer - providing localized moisture protection exactly where the harmful moisture transmission occurs, without requiring changes to the entire structure.

Inventive Principle:

Principle #3Local quality

3Reliability

If protective layer with lower moisture permeability is added between partition walls and light-emitting layer, then reliability is improved, but device complexity increases

Engineering Contradiction:

ImprovereliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protective layer is introduced as a functional intermediary with a clear and simple role - blocking moisture. This straightforward mediator approach improves reliability without requiring complex multi-layer structures or complicated manufacturing processes, thus minimizing the increase in device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The protective layer is implemented as a thin film structure that can be deposited using conventional thin-film techniques. This thin-film approach adds minimal structural complexity while providing effective moisture protection, as thin films can be integrated into existing manufacturing workflows without significant process changes.

Inventive Principle:

Principle #30Flexible shells and thin films

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

This solution effectively suppresses the adverse effects of moisture absorption by the partition walls, reducing the likelihood of light-emitting layer degradation and enhancing the reliability of the organic electroluminescent panels.

Implementation Method 1

a protective layer disposed between each of the partition walls and the organic light-emitting layer, and having a moisture permeability lower than a moisture permeability of any of the partition walls

Methodology Applied

Scientific EffectPermeation: Permeation

Data Source

PatentUS10878753B2Organic electroluminescent panel and luminescent unit

Publication Date: 2020.12.29 MAGNOLIA BLUE CORP

AI summary

An organic electroluminescent panel includes a plurality of partition walls, an organic light-emitting layer, and a protective layer. The plurality of partition walls define a pixel region, and include an organic material. The organic light-emitting layer crosses over the plurality of partition walls. The protective layer is disposed between each of the partition walls and the organic light-emitting layer, and has a moisture permeability lower than a moisture permeability of any of the partition walls.