Hygroscopic Adhesive Layer for Flexible Display Substrate Separation
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Solution Overview
Problem
Existing methods for preparing flexible displays face challenges in ensuring firm bonding between the flexible substrate and the carrier substrate while allowing easy peeling off after the preparation process, leading to poor product quality.
Innovation Solution
A preparation method involving a first substrate coated with an adhesive layer containing silicon-modified polyurethane prepolymer, hydrophilic plasticizer, mixed filler, and silane coupling agent, bonded to a second substrate, which can be easily separated by hygroscopic swelling, allowing for firm bonding and efficient peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional adhesive is used to bond the flexible substrate to the carrier substrate, then firm bonding is achieved during the preparation process, but the substrate cannot be easily peeled off after preparation is completed
Solution Approach 1:
The adhesive's properties are changed by incorporating hygroscopic substances (such as salts like calcium chloride, magnesium chloride, or sugar) that cause the adhesive layer to absorb moisture and swell over time. This parameter change transforms the adhesive from a strong bonding state to a weakened, swollen state that facilitates easy peeling, thus resolving the contradiction between initial bonding strength and subsequent peeling ease
Solution Approach 2:
The hygroscopic adhesive layer acts as an intermediary between the flexible substrate and the rigid carrier substrate. During preparation, it provides strong bonding; over time, it absorbs moisture from the environment, swells, and weakens, enabling easy separation. This intermediary mechanism allows the system to achieve both firm initial bonding and easy subsequent peeling
2Manufacturing precision
If the flexible substrate is firmly bonded to the carrier substrate, then position accuracy and flatness are maintained during preparation, but the bonding becomes too strong for easy separation after preparation
Solution Approach 1:
The adhesive layer's bonding strength is made dynamic rather than static. Initially, it provides strong bonding to ensure position accuracy and flatness during the preparation process. Over time, as it absorbs moisture and swells, the bonding strength naturally decreases, facilitating easy peeling. This dynamic behavior resolves the contradiction between maintaining precision during preparation and enabling easy separation afterward
Solution Approach 2:
The adhesive layer undergoes parameter changes by absorbing moisture from the environment, which causes it to swell and change its bonding properties. This parameter change allows the adhesive to transition from a high-strength bonding state (maintaining position accuracy) to a low-strength state (enabling easy peeling), thus resolving the contradiction between manufacturing precision and bonding strength
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 method ensures strong initial bonding and easy separation of the substrates, simplifying the preparation process and improving product quality by using an adhesive layer with hygroscopic properties that weakens after moisture absorption.
Implementation Method 1
separating the second substrate from the first substrate by a hygroscopic swelling
Implementation Method 2
the internal structure of the adhesive layer may be broken after absorbing water
Data Source
AI summary
The present disclosure provides a preparation method of a flexible display and a flexible display, and the method may include: coating an adhesive on a first surface of a first substrate to form an adhesive layer; bonding the first substrate on the second substrate by the adhesive layer on the first surface; providing a flexible display body on the second surface of the first substrate; separating the second substrate from the first substrate by a hygroscopic swelling to obtain the flexible display. By the above-mentioned method, a preparation process flow may be simplified, and the product quality may be improved.