Perforated Support Layer for Flexible Display Bending
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Solution Overview
Problem
Flexible display panels and sensors face manufacturing obstacles due to the rigidity of thin support layers, which hinder bending and shaping around curved surfaces, and the challenge is to create a support layer that is both flexible enough to allow repeated bending and strong enough to provide structural support.
Innovation Solution
A perforated support layer with relief cuts or perforations is introduced, which reduces stiffness in the bend region, allowing for flexible bending while maintaining structural integrity, by facilitating the transfer of forces to sensors and enabling the stack to conform to specific radii.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a thin support layer is used to provide structural support, then the strength and support capability are improved, but the rigidity increases making bending difficult
Solution Approach 1:
The support layer is segmented through the introduction of perforations (through-holes or blind holes) that divide the continuous structure into smaller sections. This segmentation reduces the overall rigidity while maintaining local strength, enabling the support layer to bend more easily without compromising its ability to provide structural support to the display panel or sensor.
Solution Approach 2:
The support layer is transformed into a porous structure by creating an array of perforations throughout the material. This porous configuration reduces the effective stiffness of the support layer, allowing it to conform to curved surfaces and undergo repeated bending cycles while still providing adequate structural support. The perforations create a flexible yet supportive architecture.
2Ease of operation
If the support layer is made thinner to improve flexibility, then the bendability is improved, but the structural support capability deteriorates
Solution Approach 1:
The support layer exhibits local quality variations through the strategic placement of perforations. Areas with higher perforation density provide greater flexibility, while regions with lower density maintain structural integrity. This non-uniform distribution of material properties allows the support layer to simultaneously achieve flexibility for bending and sufficient strength for support.
Solution Approach 2:
The perforated support layer creates a composite structure combining solid material regions with void spaces. This composite architecture provides a favorable strength-to-weight ratio and flexibility, where the remaining material sections maintain structural support while the overall structure gains bendability through the integrated void network.
3Duration of action of moving object
If repeated bending is allowed to extend device life, then the duration of action is improved, but mechanical failure risk increases
Solution Approach 1:
The perforated structure acts as a cushioning mechanism that anticipates and mitigates the stresses of repeated bending. The void spaces created by perforations absorb and distribute mechanical stresses during bending cycles, preventing stress concentration that would lead to crack initiation and propagation. This beforehand cushioning extends the device's service life by reducing mechanical failure risk.
Data Source
AI summary
A perforated support layer that facilitates static and dynamic bending is provided herein. A device can comprise a device chassis, a flexible display panel, and a support layer sandwiched between the device chassis and the flexible display panel. The support layer can comprise a set of perforations formed in a bend region of the support layer. Also provided is a method that can comprise forming relief cuts in a bend region of a support layer. The method also can comprise bonding a first side of the support layer to a device chassis and bonding a second side of the support layer to a flexible display panel.