Multi-Layer Sealing Structure for Display Device Line Disconnection

Solution Overview

Problem

In display devices with organic EL elements, thick sealing layers can cause line disconnection issues when forming touch sensor lines, compromising the reliability of the display device.

Innovation Solution

A multi-layered sealing structure comprising inorganic and organic insulating layers is implemented, where the edges of the organic sealing layers are strategically positioned between the inorganic sealing layers to prevent moisture and oxygen permeation, and the inorganic sealing layers are placed outer to the organic layers to ensure comprehensive coverage and stability, preventing line disconnection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a thick sealing layer is used to prevent moisture and oxygen permeation, then the sealing effectiveness is improved, but line disconnection occurs in touch sensor lines

Engineering Contradiction:

Improvesealing effectivenessVSAvoidline disconnection

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The sealing layer is divided into multiple thin layers (first inorganic insulating layer, first organic insulating layer, second organic insulating layer, third organic insulating layer, and second inorganic insulating layer) instead of using a single thick sealing layer. This segmentation prevents line disconnection while maintaining moisture and oxygen barrier effectiveness, as each thin layer can be formed without causing stress concentration that leads to cracking.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The sealing structure uses a composite of inorganic and organic insulating layers. The inorganic layers (first and second inorganic insulating layers) provide excellent moisture and oxygen barrier properties, while the organic layers (first, second, and third organic insulating layers) provide flexibility and stress relief, preventing line disconnection in touch sensor lines.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If the sealing layer is made thinner to prevent line disconnection, then the ease of manufacture is improved, but moisture and oxygen permeation increases

Engineering Contradiction:

Improveline connection stabilityVSAvoidmoisture and oxygen permeation

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The sealing structure uses a composite of inorganic and organic insulating layers. The inorganic layers (first and second inorganic insulating layers) provide excellent moisture and oxygen barrier properties, while the organic layers (first, second, and third organic insulating layers) provide flexibility and stress relief, preventing line disconnection in touch sensor lines.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Multiple sealing layers with different functions are merged into a single integrated sealing structure. The inorganic layers provide barrier functionality while the organic layers provide mechanical flexibility, and together they achieve both protection against permeation and prevention of line disconnection.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If a multi-layered sealing structure is implemented, then the reliability is improved, but the device complexity increases

Engineering Contradiction:

Improvelong-term operation stabilityVSAvoidsealing layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The sealing layer is divided into multiple thin layers (first inorganic insulating layer, first organic insulating layer, second organic insulating layer, third organic insulating layer, and second inorganic insulating layer) instead of using a single thick sealing layer. This segmentation prevents line disconnection while maintaining moisture and oxygen barrier effectiveness, as each thin layer can be formed without causing stress concentration that leads to cracking.

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

This configuration enhances the long-term reliability of the display device by maintaining the sealing effectiveness while preventing line disconnection, ensuring stable operation of the touch sensor and display elements.

Implementation Method 1

a sealing layer prevents permeation of moisture or oxygen into an organic light emitting layer

Methodology Applied

Scientific EffectPermeation prevention:

Data Source

PatentUS11018320B2Display device

Publication Date: 2021.05.25 MAGNOLIA WHITE CORP

AI summary

A display device includes a display region including light emitting elements; a first inorganic insulating layer covering the light emitting elements; a first organic insulating layer on the first inorganic insulating layer; a second organic insulating layer on the first organic insulating layer; a third organic insulating layer on the second organic insulating layer; and a second inorganic insulating layer on the third organic insulating layer. Edges of the first to third organic insulating layers are between edges of the first and second inorganic insulating layers and an edge of the display region; the edge of the second organic insulating layer is between the edge of the first organic insulating layer and the edge of the display region; and the edge of the third organic insulating layer is between the edges of the first and second inorganic insulating layers and the edge of the second organic insulating layer.