Foldable Display Anti-Corrosion Structure With Segmented Adhesive

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Solution Overview

Problem

Existing foldable display devices face challenges in maintaining improved folding properties and resistance to corrosion, particularly in the folding regions, which can lead to structural integrity issues and reduced durability.

Innovation Solution

The display device incorporates a design with a first and second non-folding region, a first and second sub-plate with adhesive layers, and a second plate with an anti-corrosion layer, along with a high restoration layer and elastomer to enhance folding properties and protect against corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If adhesive layers are applied to the entire bottom surface of the second plate, then bonding strength is improved, but folding durability deteriorates due to stress concentration in the folding region

Engineering Contradiction:

Improvebonding strengthVSAvoidfolding durability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The adhesive layer is segmented into two distinct regions: a first adhesive layer with larger thickness applied to non-folding regions for strong bonding, and a second adhesive layer with smaller thickness applied to the folding region for flexible bonding that accommodates repeated folding movements without cracking or delamination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different adhesive properties are applied to different regions of the second plate based on their functional requirements. The folding region receives adhesive with smaller thickness and different material properties compared to non-folding regions, optimizing each region's performance for its specific operational conditions.

Inventive Principle:

Principle #3Local quality

2Strength

If the second plate is made of metal for structural strength, then strength is improved, but corrosion resistance deteriorates in the folding region

Engineering Contradiction:

Improvestructural strengthVSAvoidcorrosion resistance

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The second plate is constructed as a composite structure combining a metal base plate for structural strength with a corrosion-resistant coating layer applied to the folding region. This composite approach maintains the mechanical strength of metal while protecting the vulnerable folding area from corrosion through the protective coating.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

Corrosion protection is applied locally to the folding region where it is most needed, rather than uniformly across the entire plate. The corrosion-resistant coating is specifically applied to areas subjected to repeated folding and potential moisture exposure, optimizing protection where it matters most.

Inventive Principle:

Principle #3Local quality

3Strength

If a thick adhesive layer is used for strong bonding, then bonding strength is improved, but folding flexibility deteriorates

Engineering Contradiction:

Improvebonding strengthVSAvoidfolding flexibility

Core Design Contradiction:

StrengthVSAdaptability or versatility

Solution Approach 1:

The adhesive layer is divided into two segments with different thicknesses: a first adhesive layer with larger thickness for strong bonding in non-folding regions, and a second adhesive layer with smaller thickness for maintaining flexibility in the folding region. This segmentation allows each region to have the adhesive properties optimal for its function.

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

The solution provides enhanced folding durability and resistance to corrosion, improving the structural integrity and longevity of the display device.

Implementation Method 1

an adhesive layer disposed on a bottom surface of the second plate. The adhesive layer includes a first sub-adhesive layer disposed on an edge of the first sub-plate, and a second sub-adhesive layer disposed on an edge of the second sub-plate

Methodology Applied

Scientific EffectAdhesion: Adhesive

Implementation Method 2

an anti-corrosion layer disposed between the second plate and the lower film. The lower film is in contact with a top surface of the second plate, and the anti-corrosion layer covers the top surface of the second plate, which is exposed by the groove

Methodology Applied

Scientific EffectCorrosion protection: Coatings

Implementation Method 3

a high restoration layer including an elastomer and disposed between the first plate and the lower adhesive layer

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS12449855B2Anti-corrosion and waterproofing structure and display device having the same

Publication Date: 2025.10.21 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a display panel including a folding region and a non-folding region which is adjacent to the folding region along a first direction, a first plate facing the display panel, a second plate facing the non-folding region of the display panel with the first plate therebetween, the second plate including a first sub-plate and a second sub-plate spaced apart from each other along the first direction, at the folding region, and each of the first sub-plate and the second sub-plate including an outer edge, and an adhesive layer protruded from the second plate, in a direction away from the first plate. The adhesive layer includes a first sub-adhesive layer extended along the outer edge of the first sub-plate, and a second sub-adhesive layer extended along the outer edge of the second sub-plate.