Transparent Screen Adhesion Layer for Image Projection

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Solution Overview

Problem

The adhesion force between the reflection layer and the second transparent resin layer in existing image projection structures is often insufficient, leading to exfoliation at their interface, which degrades the image display characteristics of transparent screens.

Innovation Solution

An image projection structure is developed with a first transparent layer having an irregular surface, a reflection layer, an adhesion layer of linear polymers with a mold shrinkage factor less than 3%, and a second transparent layer with a cross-linking structure, where the adhesion layer is formed by coating a solvent-based polymer solution and the second transparent layer is cured to mitigate volume reduction stress.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a reflection layer is arranged directly on the first transparent layer and a second transparent layer is arranged on the reflection layer, then the structure is simple, but the adhesion force between the reflection layer and the second transparent layer is insufficient, causing exfoliation

Engineering Contradiction:

Improvestructure complexityVSAvoidadhesion force

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

An adhesion layer is introduced as an intermediary between the reflection layer and the second transparent layer. This adhesion layer specifically enhances the bonding force between these two layers, preventing exfoliation while maintaining overall structural simplicity. The adhesion layer acts as a mediator that resolves the adhesion problem without requiring complete structural redesign.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the second transparent layer is formed by cross-linking reaction, then the resin achieves high strength and stability, but volume reduction occurs during curing, generating stress that can cause exfoliation

Engineering Contradiction:

Improveresin strengthVSAvoidcuring stress

Core Design Contradiction:

StrengthVSStress or pressure

Solution Approach 1:

The adhesion layer is applied beforehand on the reflection layer before forming the second transparent layer. This pre-applied adhesion layer serves as a cushioning layer that can absorb and mitigate the stress generated during the cross-linking reaction of the second transparent layer, preventing stress-induced exfoliation while allowing the resin to achieve its full strength potential.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent specifies that the adhesion layer should have a mold shrinkage factor of less than 3%, which is a controlled parameter change. This low shrinkage characteristic ensures that the adhesion layer itself does not generate significant stress during formation, and can effectively buffer the stress from the second transparent layer's cross-linking reaction.

Inventive Principle:

Principle #35Parameter changes

3Volume of moving object

If the adhesion layer has high mold shrinkage factor, then the coating liquid forms a thick adhesion layer, but the stress from shrinkage causes exfoliation at the interface

Engineering Contradiction:

Improveadhesion layer thicknessVSAvoidinterface stability

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

The patent explicitly controls the mold shrinkage factor of the adhesion layer to be less than 3%, which is a critical parameter change. This low shrinkage parameter ensures that even when the adhesion layer has sufficient thickness for good adhesion, it does not generate excessive shrinkage stress that would cause interface exfoliation.

Inventive Principle:

Principle #35Parameter changes

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 prevents exfoliation between the reflection and second transparent layers, enhancing adhesiveness and maintaining image clarity while allowing visibility of the rear background.

Implementation Method 1

an adhesion layer arranged on the reflection surface; and a second transparent layer arranged on the adhesion layer, the adhesion layer being configured of linear polymers with a mold shrinkage factor of less than 3%, and the second transparent layer being configured of a resin having a cross-linking structure

Methodology Applied

Scientific EffectMold shrinkage: Thermal Contraction

Implementation Method 2

the second transparent layer being configured of a resin having a cross-linking structure

Methodology Applied

Scientific EffectCross-linking: Chemical Bonding

Implementation Method 3

a first transparent layer having an irregular surface; a reflection layer arranged on the irregular surface of the first transparent layer

Methodology Applied

Scientific EffectSurface area effect: Adsorption

Data Source

PatentEP3457210B1Image projection structure, transparent screen, and manufacturing method for image projection structure

Publication Date: 2020.12.16 AGC INC

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AI summary

An image projection structure includes a first transparent layer having an irregular surface; a reflection layer arranged on the irregular surface of the first transparent layer; an adhesion layer arranged on the reflection surface; and a second transparent layer arranged on the adhesion layer. The adhesion layer is configured of linear polymers with a mold shrinkage factor of less than 3%. The second transparent layer is configured of a resin having a cross-linking structure.