Dual Adhesive Layer Design for Foldable Display Cracking
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Solution Overview
Problem
Foldable display devices face challenges in maintaining structural integrity and flexibility due to the limitations of existing adhesive materials, which can lead to cracking and reduced impact resistance during folding operations.
Innovation Solution
A display device design incorporating a dual adhesive layer system, where a first adhesive material with a higher elongation rate is used in non-folding areas and a second adhesive material with an even higher elongation rate is used in the folding area, with specific patterns and distributions to enhance flexibility and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single adhesive material is used in the folding area, then the adhesive layer is simple in structure, but the adhesive material cannot simultaneously provide both flexibility for folding and impact resistance
Solution Approach 1:
The adhesive layer is divided into two distinct regions with different adhesive materials: the first adhesive material with higher elongation rate is applied in the folding area to provide flexibility, while the second adhesive material with lower elongation rate is applied in the non-folding area to provide impact resistance. This local differentiation allows each region to have the specific properties needed for its function.
Solution Approach 2:
The adhesive layer uses a composite structure combining two different adhesive materials with distinct properties. The first adhesive material (higher elongation) and second adhesive material (lower elongation) work together in a layered configuration, allowing the overall adhesive system to provide both flexibility in the folding area and strength in the non-folding area.
2Reliability
If a dual adhesive layer system is used with different materials, then both flexibility and impact resistance are improved, but the structure becomes more complex
Solution Approach 1:
The adhesive layer is segmented into two distinct layers: a first adhesive layer containing the first adhesive material with higher elongation rate, and a second adhesive layer containing the second adhesive material with lower elongation rate. This segmentation allows each layer to perform its specific function while maintaining a relatively simple overall structure that is easy to manufacture.
Data Source
AI summary
A display device includes a display part including a first non-folding area, a second non-folding area, and a folding area between the first non-folding area and the second non-folding area, the folding area being foldable with respect to a folding axis, a window disposed on the display part, and an adhesive layer disposed between the display part and the window, the adhesive layer including a first adhesive material and a second adhesive material having an elongation rate greater than an elongation rate of the first adhesive material. The first adhesive material has a planar area greater than a planar area of the second adhesive material in each of the first non-folding area and the second non-folding area, and the second adhesive material has a planar area greater than a planar area of the first adhesive material in the folding area.