Flexible Display Adhesive Elastic Modulus Strain Distribution

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Solution Overview

Problem

Flexible display devices face strain-related defects when bent, due to the lack of effective stress distribution between the display panel and outer members, leading to potential damage and decoupling.

Innovation Solution

Incorporating an adhesive member with an elastic modulus significantly lower than the display panel and outer members, allowing for independent strain distribution and minimizing stress concentrations, thereby reducing strain on both components during bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the flexible display panel and outer members are rigidly coupled, then structural stability is improved, but strain concentration and damage occur during bending

Engineering Contradiction:

Improvestructural stabilityVSAvoidstrain resistance

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent introduces an adhesive member as an intermediary between the flexible display panel and outer members. This adhesive layer has different mechanical properties than the rigid coupling approach, allowing it to mediate stress distribution during bending. The adhesive member absorbs and distributes strains, preventing direct stress concentration at the interface between the display panel and outer members, thus resolving the contradiction between structural stability and strain resistance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the mechanical parameters of the coupling system by selecting an adhesive member with specific elastic modulus and thickness parameters that differ from rigid materials. By adjusting these parameters, the system transitions from rigid coupling to flexible coupling, enabling the structure to maintain stability while accommodating bending-induced strains without damage.

Inventive Principle:

Principle #35Parameter changes

2Strength

If the adhesive member has high elastic modulus, then coupling strength is improved, but stress concentration increases during bending

Engineering Contradiction:

Improvecoupling strengthVSAvoidstress concentration

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The patent optimizes the elastic modulus parameter of the adhesive member to a specific range that balances coupling strength and stress distribution. By carefully selecting this parameter, the adhesive member maintains sufficient bonding strength between components while simultaneously reducing stress concentration during bending operations.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The adhesive member acts as a pre-designed cushioning layer that anticipates and absorbs bending stresses before they can concentrate at critical interfaces. This beforehand cushioning effect prevents stress concentration while maintaining coupling integrity.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Reliability

If the adhesive member has low elastic modulus, then strain distribution is improved, but coupling strength decreases

Engineering Contradiction:

Improvestrain distributionVSAvoidcoupling strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent identifies and implements an optimal range for the elastic modulus of the adhesive member that simultaneously achieves good strain distribution and adequate coupling strength. This parameter optimization resolves the apparent trade-off by finding the sweet spot where both requirements are satisfied.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The adhesive member represents a composite material solution that combines the benefits of flexibility for strain distribution with sufficient bonding capability for coupling strength, achieving a balance that neither extreme (too rigid or too soft) could provide alone.

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 reduces strain on the flexible display panel and outer members, preventing damage and maintaining their physical coupling, even when bent, thus enhancing the durability and reliability of the flexible display device.

Implementation Method 1

An elastic modulus of the adhesive member is from about 1/1000000 to about 1/1000 of an elastic modulus of each of the flexible display panel and the flexible outer member

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS10698240B2Flexible display device

Publication Date: 2020.06.30 SAMSUNG DISPLAY CO LTD

AI summary

A flexible display device includes a flexible display panel, a flexible outer member disposed on the flexible display panel, and an adhesive member disposed between the flexible display panel and the flexible outer member. An elastic modulus of the adhesive member is from about 1/1000000 to about 1/1000 of an elastic modulus of each of the flexible display panel and the flexible outer member.