Protective Film Adhesive Layer for Flexible Display
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Solution Overview
Problem
Flexible display devices face challenges with protective films that either detach easily due to weak adhesive strength or damage the display screen during replacement due to strong adhesive strength, and existing solutions fail to provide a visual indication of adhesive strength reduction.
Innovation Solution
A protective film with an adhesive layer that has a first adhesive strength and a second adhesive strength, where the second adhesive strength is significantly reduced upon exposure to heat or ultraviolet rays, allowing for easy detachment without damaging the display screen, and includes a microcapsule structure with a gas generation mechanism for controlled adhesive strength reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the adhesive strength of the protective film is increased to prevent detachment during folding, then the protective film remains attached during repeated folding and unfolding, but the protective film cannot be removed without damaging the display screen during replacement
Solution Approach 1:
The adhesive layer transitions from a static high-adhesion state during device operation to a low-adhesion state during replacement. This is achieved through a dynamic response to external stimuli (heat or UV light) that triggers a chemical or physical change in the adhesive material, reducing its bonding strength and enabling easy removal without screen damage
Solution Approach 2:
The adhesive strength parameter is changed by applying external energy (heat or UV radiation). The adhesive layer contains materials that undergo a parameter change in response to these stimuli, such as thermal expansion creating gaps or UV-induced chemical bond breakdown, transforming the adhesive from strong to weak state for controlled removal
2Ease of repair
If the adhesive strength is reduced to enable easy removal, then the protective film can be detached without damaging the display screen, but the protective film detaches during repeated folding and unfolding operations
Solution Approach 1:
The adhesive layer transitions from a static low-adhesion state to a dynamic system that adapts its adhesive properties. During normal use, the adhesive maintains strong bonding; when exposed to heat or UV light during replacement, it dynamically reduces adhesion to enable safe removal
Solution Approach 2:
The adhesive layer is pre-designed with embedded materials (microcapsules, gas-generating compounds) that are activated only when needed. This preliminary preparation allows the adhesive to maintain strength during use and then switch to a removable state when exposed to specific stimuli during replacement operations
3Device complexity
If conventional adhesive materials are used without visual indication mechanisms, then the adhesive layer is simple in structure, but it is impossible to visually verify adhesive strength reduction without specialized equipment
Solution Approach 1:
The adhesive layer incorporates materials that undergo color changes or visual property changes in response to heat or UV exposure. This allows operators to visually verify that the adhesive has been activated and its strength reduced, confirming it is ready for safe removal without requiring specialized measurement equipment
Solution Approach 2:
Visual indicators act as an intermediary between the adhesive strength change and the operator's perception. The color or optical property changes serve as a mediator that translates the invisible chemical/physical changes in the adhesive into visible signals that confirm the adhesive state
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 protective film maintains strong adhesive strength during use and reduces to a lower strength for easy detachment, minimizing display screen damage and allowing visual verification of adhesive strength reduction without visual aids, ensuring reliable and damage-free replacement.
Implementation Method 1
a microcapsule which is in the base resin, and the microcapsule may include a core portion and an outer coating which surrounds the core portion
Implementation Method 2
The adhesive layer may discharge a nitrogen gas in the second state
Data Source
AI summary
A display device includes a protective film that includes an adhesive layer. The adhesive layer has a first adhesive strength at a room temperature and has a second adhesive strength equal to or smaller than about 25% of the first adhesive strength in a second state in which a heat or ultraviolet ray is provided.