Flexible Display Adhesive Layer Segmentation for Recovery Force
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Solution Overview
Problem
Conventional flexible display apparatuses face a trade-off between flexibility and recovery force, where high elongation adhesive layers provide excellent flexibility but low recovery, and high recovery adhesive layers offer excellent recovery but low flexibility, making it difficult to achieve both properties simultaneously.
Innovation Solution
A flexible display apparatus is designed with multiple functional layers and adhesive layers, where the first adhesive layer has a high recovery rate, the second adhesive layer has a lower recovery rate for higher elongation, and additional layers such as a touch screen or optical film layers are included to optimize flexibility and recovery force, with specific recovery rates and thicknesses for each adhesive layer to balance stress and folding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an adhesive layer has a high elongation property, then flexibility is improved, but recovery force deteriorates
Solution Approach 1:
The adhesive layer is divided into multiple sub-layers with different elongation properties. The first adhesive layer has high elongation (first elongation rate) to provide flexibility, while the second adhesive layer has low elongation (second elongation rate) to provide recovery force. This segmentation allows each sub-layer to perform its specific function independently, resolving the contradiction between flexibility and recovery force.
Solution Approach 2:
Different regions of the adhesive structure are assigned different material properties. The first adhesive layer is positioned to provide local flexibility where needed, while the second adhesive layer is positioned to provide local recovery force. This local differentiation of quality allows the overall structure to achieve both flexibility and recovery force simultaneously.
2Strength
If an adhesive layer has a high recovery property, then recovery force is improved, but flexibility deteriorates
Solution Approach 1:
The adhesive system is segmented into multiple layers where the second adhesive layer with low elongation rate provides the recovery force function, while the first adhesive layer with high elongation rate provides the flexibility function. This segmentation enables the recovery force to be generated without compromising overall flexibility.
Solution Approach 2:
The adhesive structure uses a composite of different adhesive materials with complementary properties. By combining a high-elongation adhesive material with a low-elongation adhesive material in specific layers, the composite structure achieves both flexibility and recovery force that neither material could provide alone.
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 allows for a flexible display apparatus that can be repeatedly folded and unfolded with both excellent flexibility and recovery force, reducing stress and minimizing defective products by varying the recovery rates and thicknesses of adhesive layers, ensuring effective inter-layer bonding and protection.
Implementation Method 1
an adhesive layer is located between the various layers while stacking the various layers
Implementation Method 2
when an adhesive layer that is between various layers of the general flexible display apparatus has a high elongation property, the general flexible display apparatus may have excellent flexibility, but may also have a relatively low recovery force
Data Source
AI summary
A flexible display apparatus includes a first functional layer, a second functional layer above the first functional layer, a third functional layer above the second functional layer, a first adhesive layer between the first functional layer and the second functional layer, and having a first recovery rate, and a second adhesive layer between the second functional layer and the third functional layer, and having a second recovery rate that is lower than the first recovery rate.