Sealing Portion Injection Holes for Display Substrate Mechanical Strength

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Solution Overview

Problem

Organic electroluminescence displays often have empty spaces between substrates that weaken their mechanical strength due to incomplete bonding by sealing portions, leading to potential defects like cracks during handling or use.

Innovation Solution

A display apparatus with a first substrate, a second substrate overlapping part of the first, and a sealing portion with injection holes situated on the boundary between the overlapping and non-overlapping regions, allowing for improved adhesion and mechanical strength through the injection of a stiffener via these holes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a sealing portion is used to bond substrates, then the substrates are sealed and protected, but empty spaces remain between substrates weakening mechanical strength

Engineering Contradiction:

Improvesealing effectivenessVSAvoidmechanical strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The sealing portion is designed with injection holes that create a porous structure, allowing stiffener material to be injected into the empty spaces between substrates. This porous design enables the stiffener to fill voids and bond the substrates more effectively, resolving the contradiction between sealing effectiveness and mechanical strength.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The invention combines the sealing portion (made of sealing material) with a stiffener (made of different material) to create a composite structure. The composite material approach allows the sealing portion to maintain its sealing function while the injected stiffener provides enhanced mechanical strength, addressing both requirements simultaneously.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If substrates are cut after bonding, then the display is finalized, but cracks and defects may occur during cutting

Engineering Contradiction:

Improvesubstrate cuttingVSAvoiddefect prevention

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The stiffener is injected into the sealing portion before the cutting process. This beforehand cushioning provides structural support and shock absorption during cutting, preventing cracks and defects from occurring when the substrate is subsequently cut, thus resolving the contradiction between ease of manufacture and defect prevention.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the sealing portion covers the entire substrate boundary, then complete sealing is achieved, but injection of stiffener becomes difficult

Engineering Contradiction:

Improvesealing completenessVSAvoidstiffener injection

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The sealing portion is segmented with injection holes distributed along its length. This segmentation allows the stiffener to be injected at multiple points along the sealing portion, making the injection process easier and more effective while maintaining complete sealing coverage. The segmented design resolves the contradiction between sealing completeness and ease of stiffener injection.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS8878202B2Display apparatus and method of fabricating the same

Publication Date: 2014.11.04 SAMSUNG DISPLAY CO LTD

AI summary

A display apparatus comprises a first substrate, a second substrate separated from the first substrate and facing the first substrate, and a first sealing portion interposed between the first substrate and the second substrate, wherein the first substrate comprises a first region overlapped by the second substrate and a second region not overlapped by the second substrate, and the first sealing portion is situated on a boundary between the first region and the second region and comprises one or more injection holes.