Adhesive Layer with Localized Adhesion for Flexible Display Folding
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Solution Overview
Problem
Flexible display devices face unsatisfactory performance over time due to repeated deformation during folding and unfolding, leading to inadequate display surface integrity.
Innovation Solution
A manufacturing method for an adhesive layer with distinct adhesion force regions, where a preliminary adhesive layer is treated with a removal solution containing a silicon-containing compound and solvent, reducing the adhesion force in the folding area while maintaining it in non-folding areas, thereby minimizing display surface deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform adhesive layer is used across the entire display device, then the adhesive provides consistent bonding strength, but the repeated folding and unfolding causes display surface deformation and performance degradation over time
Solution Approach 1:
The adhesive layer is designed with different adhesion characteristics in different regions: the first area (folding area) has reduced adhesion force to allow stress relief during folding, while the second area (non-folding area) maintains strong adhesion for stable bonding. This local differentiation resolves the contradiction by allowing the folding area to deform without damaging the display surface while maintaining overall structural integrity.
2Stability of the object's composition
If the adhesive force is reduced in the folding area to minimize deformation, then the display surface integrity is maintained, but the bonding strength in that area is compromised
Solution Approach 1:
The adhesive layer exhibits spatially varying adhesion properties through selective treatment: the folding area undergoes treatment to reduce adhesion force for stress relief, while the non-folding area retains full adhesion strength for secure bonding. This resolves the contradiction by localizing the adhesion reduction only where necessary for display surface protection.
Solution Approach 2:
The adhesive layer is functionally segmented into distinct regions with different adhesion characteristics. The first area (folding area) and second area (non-folding area) are separated by a mask boundary, allowing independent optimization of adhesion properties for each region's specific functional requirements.
3Strength
If the adhesive force is maintained in non-folding areas for strong bonding, then the bonding strength is sufficient, but the contrast between adhesion forces creates stress concentration at the boundary
Solution Approach 1:
The adhesive layer is divided into distinct functional zones separated by a mask boundary. The first area (folding area) with reduced adhesion and the second area (non-folding area) with full adhesion are clearly segmented, allowing stress to be managed at the interface while maintaining strong bonding in the non-folding region.
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 method ensures good folding reliability and reduced display surface deformation even after repeated folding and unfolding, maintaining the adhesive force in non-folding areas and reducing stress at the folding area, thus enhancing the durability of flexible display devices.
Implementation Method 1
providing a removal solution containing an additive and a solvent for a second area portion of the preliminary adhesive layer that is adjacent to the first area portion and to which the mask is not attached
Data Source
AI summary
A manufacturing method of an adhesive layer includes: providing a preliminary adhesive layer, attaching a mask to a first area portion of the preliminary adhesive layer, and thereby, provide a second area portion of the preliminary adhesive layer that is adjacent to the first area portion and to which the mask is not attached, to provide an adhesive layer that exhibits good folding reliability. In addition, a display device may exhibit good folding reliability characteristics by including the adhesive layer from which an adhesion force of a folding area is reduced between a supporting member and a display panel of the display device.