Flexible Display Window Structure for Replaceable Protective Layers

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Solution Overview

Problem

Existing flexible display devices face challenges in maintaining durability and requiring complete window replacement when the protective layer is damaged, which is inefficient and costly.

Innovation Solution

A window structure with a polymer layer that changes adhesive strength and hydrophilic/hydrophobic properties with temperature, allowing selective replacement of the protective layer without replacing the entire window.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If the protective layer is damaged in existing flexible display devices, then the window must be completely replaced, but this increases manufacturing cost and complexity

Engineering Contradiction:

Improveprotective layer replacementVSAvoidwindow structure

Core Design Contradiction:

Ease of repairVSDevice complexity

Solution Approach 1:

The window structure is divided into separate functional layers: a glass substrate, a polymer layer, an adhesive layer, and a protective layer. This segmentation allows the protective layer to be replaced independently without affecting the other components, resolving the contradiction by enabling partial replacement rather than complete window replacement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The polymer layer is extracted as a distinct intermediate layer between the glass substrate and the protective layer. This extracted layer serves as a temperature-responsive interface that enables selective bonding, allowing the protective layer to be removed and reattached without damaging the underlying glass substrate or adhesive layer.

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of repair

If temperature is increased to remove the protective layer, then adhesive strength decreases enabling separation, but this requires precise temperature control

Engineering Contradiction:

Improveprotective layer removalVSAvoidheating control

Core Design Contradiction:

Ease of repairVSTemperature

Solution Approach 1:

The adhesive strength of the polymer layer is changed by varying the temperature parameter. At elevated temperatures (e.g., 60-80°C), the polymer layer's adhesive strength decreases, enabling easy separation of the protective layer. At room temperature, the adhesive strength increases, ensuring secure bonding. This parameter change resolves the contradiction by providing controllable adhesion based on temperature conditions.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The polymer layer undergoes a phase transition in its adhesive properties in response to temperature changes. The transition from a strongly adhesive state at room temperature to a weakly adhesive state at elevated temperatures enables reversible bonding and debonding, facilitating protective layer replacement without permanent damage to other components.

Inventive Principle:

Principle #36Phase transitions

3Ease of repair

If the polymer layer is made hydrophobic at high temperature, then the protective layer can be separated, but surface properties must be precisely controlled

Engineering Contradiction:

Improveprotective layer separationVSAvoidsurface property control

Core Design Contradiction:

Ease of repairVSManufacturing precision

Solution Approach 1:

The surface properties of the polymer layer are changed by varying the temperature parameter. Heating the polymer layer causes it to transition from a hydrophilic state (high surface energy, strong adhesion) to a hydrophobic state (low surface energy, weak adhesion). This parameter change enables precise control over the bonding interface, allowing the protective layer to be separated when needed while maintaining strong bonding during normal operation.

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

Enables efficient and cost-effective replacement of the protective layer by exploiting temperature-induced changes in adhesive strength and surface properties, maintaining the window's integrity and functionality.

Implementation Method 1

the polymer layer having a surface adjacent to the adhesive layer, the surface being hydrophilic at a first temperature and being hydrophobic at a second temperature higher than the first temperature

Methodology Applied

Scientific EffectTemperature-induced hydrophilic/hydrophobic transition: Hydrophile

Implementation Method 2

an adhesive strength of the adhesive layer to the polymer layer at the first temperature may be higher than an adhesive strength of the adhesive layer to the polymer layer at the second temperature

Methodology Applied

Scientific EffectThermal modulation of adhesive strength: Heat Treatment

Data Source

PatentUS12539689B2Window, method for manufacturing the same, and display device including the same

Publication Date: 2026.02.03 SAMSUNG DISPLAY CO LTD

AI summary

A window is provided to include a glass substrate, an adhesive layer on the glass substrate, a polymer layer between the glass substrate and the adhesive layer, the polymer layer having a surface adjacent to the adhesive layer, the surface being hydrophilic at a first temperature and being hydrophobic at a second temperature higher than the first temperature, and a protective layer on the adhesive layer. Thereby, when the protective layer is damaged, only the protective layer may be replaced without replacing a glass substrate.