Tacky Layer Shock Absorption for Organic EL Displays

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Solution Overview

Problem

Current light-emitting display devices, particularly organic EL display devices, face challenges in achieving high definition and low power consumption while being susceptible to external impacts that can cause display faults such as light emission failures and non-uniformity due to the lack of effective shock absorption mechanisms.

Innovation Solution

The implementation of a display device structure that includes a first substrate with a light emitting element, a second substrate, and a tacky layer with a third substrate, where the tack strength between the tacky layer and the substrates is weaker than the adhesive strength between the electrodes and organic layers, allowing for shock absorption and re-attachment without compromising the display's external appearance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a rigid substrate structure is used to maintain display stability, then structural strength is improved, but shock resistance deteriorates

Engineering Contradiction:

Improvestructural strengthVSAvoidshock resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent introduces a flexible tacky layer between the first and second substrates, allowing the rigid substrate structure to maintain strength while the flexible layer absorbs shock impacts, preventing damage to the light emitting element

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The tacky layer is pre-installed between substrates to provide cushioning before external impacts occur, absorbing shock energy and preventing direct transmission to the light emitting element, thereby maintaining reliability without compromising structural strength

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Strength

If strong adhesive is used to bond substrates, then bonding strength is improved, but shock absorption capability deteriorates

Engineering Contradiction:

Improvebonding strengthVSAvoidshock absorption capability

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent changes the adhesive parameter by using a tacky layer with specific tack strength that is weaker than the adhesive strength between electrodes and organic layers, allowing the layer to maintain bonding while deforming under shock to absorb impact energy

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The tacky layer serves as an intermediary between the rigid substrates and the light emitting element, providing a compliant interface that bonds substrates together while absorbing shock, thus protecting the light emitting element without requiring strong adhesive bonding throughout the entire structure

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If thin film structure is used to achieve flexibility and light weight, then ease of manufacture is improved, but susceptibility to external impacts worsens

Engineering Contradiction:

Improveflexibility and light weightVSAvoidsusceptibility to external impacts

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent employs thin film structures for substrates and light emitting elements to achieve flexibility and light weight, while introducing a tacky layer that provides shock absorption, thus maintaining ease of manufacture while reducing susceptibility to external impacts

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The tacky layer is integrated into the thin film structure beforehand to provide cushioning against external impacts, allowing the display device to maintain its flexible and lightweight characteristics while being protected from damage during use

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 structure effectively absorbs external impacts, preventing the peeling off of electrodes and organic materials, maintaining the display's normal appearance and reducing faults like light emission failures and non-uniformity, while also allowing for flexible and lightweight design.

Implementation Method 1

a tacky layer located between the second substrate and the third substrate, a tack strength between the tacky layer and the second substrate or the third substrate being weaker than an adhesive strength between one of the pair of electrodes and the one organic layer

Methodology Applied

Scientific EffectViscoelasticity: Viscoelasticity

Data Source

PatentUS10020463B2Display device with tacky layer

Publication Date: 2018.07.10 MAGNOLIA WHITE CORP

AI summary

A display device includes a first substrate, a light emitting element located on the first substrate and including a pair of electrodes and one organic layer or a plurality of organic layers located between the pair of electrodes, a second substrate located to face the first substrate, a third substrate located on a surface of the second substrate opposite to a surface thereof facing the light emitting element, and a tacky layer located between the second substrate and the third substrate, a tack strength between the tacky layer and the second substrate or the third substrate being weaker than an adhesive strength between one of the pair of electrodes and the one organic layer or an adhesive strength between the plurality of organic layers.