Segmented Adhesive Layer for Crease Reduction in Foldable Displays
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Solution Overview
Problem
Flexible display panels tend to develop creases during folding due to squeezing forces, which affects the display effect and user experience when unfolded.
Innovation Solution
A display assembly comprising a flexible display panel, a support plate, and an adhesive layer, where the support plate is positioned at non-bending areas and the adhesive layer includes a first adhesive layer for non-bending areas and a second adhesive layer at the bending area, with the second adhesive layer applying a pulling force to reduce film layer squeezing and minimize creases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layer covers the entire display panel including bending area, then bonding strength is improved, but creases and squeezing of film layers occur during folding
Solution Approach 1:
The adhesive layer is segmented into two distinct regions: a first adhesive layer positioned only in non-bending areas, and a second adhesive layer positioned only in the bending area. This segmentation allows each adhesive layer to perform its specific function without causing harm - the first adhesive layer provides bonding strength where folding doesn't occur, while the second adhesive layer is positioned to avoid causing creases during folding operations.
Solution Approach 2:
Different regions of the display panel are assigned different adhesive properties. The non-bending areas receive the first adhesive layer optimized for strong bonding, while the bending area receives the second adhesive layer with properties that prevent crease formation. This local differentiation of adhesive characteristics resolves the contradiction between needing strong bonding and avoiding folding damage.
2Adaptability or versatility
If flexible display panel is folded, then device portability is improved, but creases develop on the display surface
Solution Approach 1:
The harmful adhesive coverage is extracted from the bending area by positioning the second adhesive layer specifically in regions that do not cause creases during folding. This selective extraction of adhesive from problematic areas allows the display panel to be folded for portability without developing unwanted creases on the display surface.
Solution Approach 2:
The second adhesive layer is preliminarily positioned in the bending area with specific properties that counteract the squeezing forces generated during folding. This preliminary anti-action prevents creases from forming in the first place, allowing the display to be folded repeatedly without degrading display quality.
3Object-affected harmful factors
If adhesive layer is applied in non-bending areas only, then creases are reduced, but bonding coverage is decreased
Solution Approach 1:
The adhesive coverage is segmented into two functional zones: the first adhesive layer covers non-bending areas to provide primary bonding support, while the second adhesive layer covers the bending area to enable folding without creases. This segmentation increases total adhesive coverage area while maintaining crease reduction benefits.
Solution Approach 2:
The adhesive layer system performs multiple functions simultaneously: the first adhesive layer provides structural bonding in stable areas, while the second adhesive layer enables flexible folding in the bending area. This multi-functionality allows comprehensive adhesive coverage without compromising either bonding strength or foldability.
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 solution effectively reduces creases in the display panel, enhancing the display effect and user experience by minimizing film layer squeezing and improving bending reliability.
Implementation Method 1
an adhesive layer for bonding the display panel and the support plate together
Implementation Method 2
a second adhesive layer disposed at the bending area and connected to the first adhesive layer... applying a pulling force to reduce film layer squeezing
Data Source
AI summary
A display assembly includes a display panel, a support plate disposed at a non-display surface of the display panel, and an adhesive layer for bonding the display panel and the support plate together. The display panel includes at least a bending area and non-bending areas disposed at two sides of the bending area. The support plate is disposed at the non-bending areas. The adhesive layer includes a first adhesive layer disposed at the non-bending areas and between the display panel and the support plate and a second adhesive layer disposed at the bending area and connected to the first adhesive layer. At least a portion of the bending area is not covered by the adhesive layer.