Sliding Display Lamination for Flexibility and Impact Resistance
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Solution Overview
Problem
Display devices with shape-changing capabilities face challenges in achieving both impact resistance and flexibility due to differing physical property requirements between sliding and non-sliding areas.
Innovation Solution
A laminated structure is implemented with different physical properties for each region, including a first adhesive layer, a cover member, and plates with varying thicknesses and materials to ensure impact resistance and flexibility, with specific thickness ranges and separation distances to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform laminated structure is used across the entire display panel, then manufacturing is simplified, but the sliding area cannot achieve the required low modulus and flexibility
Solution Approach 1:
The patent implements different laminated structures in different regions: the sliding area uses a structure with cover member, first plate, and spacing layer to achieve low modulus and flexibility, while the non-sliding area uses a simpler structure with higher impact resistance. This local differentiation resolves the contradiction by allowing each region to have the specific properties it needs without compromising manufacturing feasibility.
Solution Approach 2:
The display panel is segmented into sliding and non-sliding areas with distinct laminated structures. The sliding area is further divided into regions with different thickness configurations of the second plate (first portion and second portion). This segmentation allows independent optimization of each region's physical properties while maintaining overall structural coherence.
2Adaptability or versatility
If the cover member is made very thin to maintain flexibility, then the sliding area achieves low modulus, but impact resistance is compromised
Solution Approach 1:
The cover member thickness is optimized locally: in the sliding area, the cover member has a specific thickness range (50-400 μm) that provides flexibility, while the non-sliding area uses a different configuration that prioritizes impact resistance. The first plate and spacing layer further differentiate the structural properties between these regions.
Solution Approach 2:
The patent uses composite material structures combining cover member (polymer), first plate (rigid material), spacing layer, and second plate with different thicknesses. This composite approach allows the sliding area to achieve both flexibility (through the polymer cover member) and adequate protection (through the layered composite structure).
3Strength
If the first adhesive layer is made thick to ensure bonding strength, then structural integrity is improved, but the separation distance and flexibility of the sliding area are reduced
Solution Approach 1:
The first adhesive layer thickness is optimized at 10-30 μm, which provides sufficient bonding strength while maintaining the flexibility and low modulus requirements of the sliding area. This thin adhesive layer allows the spacing between the cover member and first adhesive layer (0.2-0.5 mm) to be effectively utilized for achieving the desired flexibility.
4Ease of manufacture
If the second plate is made uniformly thick to simplify manufacturing, then production is easier, but the sliding area cannot achieve the required thickness variation for optimal performance
Solution Approach 1:
The second plate is segmented into a first portion and a second portion with different thicknesses. The first portion has a greater thickness than the second portion, allowing precise thickness control in the sliding area while maintaining manufacturability. This segmentation enables the sliding area to achieve the required thickness variation for optimal flexibility and low modulus.
Solution Approach 2:
The second plate implements local thickness differentiation: the first portion (under the first plate) has greater thickness for structural support, while the second portion has reduced thickness to achieve the required flexibility and low modulus in the sliding area. This local quality variation optimizes both performance and manufacturing.
Data Source
AI summary
A display device according to an embodiment includes a flat area and a sliding area, a display panel disposed in the flat area and the sliding area, a first adhesive layer disposed on the display panel in the flat area, a cover member that is disposed on the display panel in the sliding area, a first plate disposed on the cover member, and a second plate disposed on the first adhesive layer. The first adhesive layer and the cover member are spaced apart from each other, and a region between the first adhesive layer and the cover member is covered by the first plate.