Flexible Display Interlocking Bonding for Shear Mobility
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Solution Overview
Problem
Existing flexible displays face challenges in providing adequate bonding strength and shear mobility while maintaining optical clarity and flexibility, and in adjusting the neutral plane position to minimize stress on display components.
Innovation Solution
A flexible display design featuring interlocking devices with optically clear components and bonding layers that include engagement elements and optical couplers, allowing for secure attachment and sliding between layers without restricting movement, and the incorporation of a stiff layer to adjust the neutral plane position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional bonding methods are used to attach layers, then bonding strength is improved, but shear mobility and flexibility deteriorate
Solution Approach 1:
The bonding layer is segmented into discrete interlocking components (first and second interlocking components) rather than using continuous traditional bonding methods. These segmented components provide localized bonding strength while allowing shear movement between layers, resolving the contradiction between bonding strength and shear mobility.
Solution Approach 2:
The interlocking components are designed with dynamic engagement features that allow relative movement between layers. The components can engage to prevent separation perpendicular to the layer surface while permitting shear mobility parallel to the surface, enabling the system to adapt its bonding characteristics based on the direction of applied forces.
2Strength
If opaque bonding materials are used, then bonding strength is improved, but optical clarity deteriorates
Solution Approach 1:
The bonding layer exhibits local quality variation where the interlocking components provide mechanical strength through their engagement structure, while the spaces between components maintain optical clarity. This localized differentiation allows the bonding layer to simultaneously achieve both bonding strength and optical transparency by assigning different functions to different regions.
3Ease of manufacture
If the neutral plane is not adjusted, then manufacturing simplicity is maintained, but stress on display components increases
Solution Approach 1:
The bonding layer with interlocking components serves as an intermediary element between the display layers. By positioning this bonding layer at a specific depth, the neutral plane can be adjusted to a location that minimizes stress on the display components. The interlocking components mediate the mechanical stresses between layers, allowing the neutral plane to be optimized for stress reduction while maintaining manufacturing feasibility.
Data Source
Figure 1~2A
Figure 2B~2C
Figure 2D~2F
AI summary
At least some aspects of the present disclosure feature a flexible display including a first layer and a second layer, a bonding layer disposed between the first layer and the second layer. The bonding layer includes an interlocking device. The interlocking device includes a first interlocking component and a second interlocking component configured to engage with the first interlocking component such that the engagement prevent the separation of the first layer from the second layer.