Auxiliary Layer Neutral Axis Shift for Flexible Panel Stress
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Solution Overview
Problem
Flexible electronic devices face limitations in flexibility due to the brittleness of components and layers, which can lead to damage from stress when bent, restricting their operational lifetime.
Innovation Solution
Incorporating an auxiliary layer on the flexible panel with a greater radius of curvature than the predetermined bending portion, which adjusts the stress distribution by shifting the neutral axis, reducing tensile stress and increasing compressive stress, thereby protecting the components from damage during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If flexible electronic device is bent to achieve flexibility, then flexibility is improved, but components and layers are prone to damages from stress
Solution Approach 1:
A buffer layer is introduced between the flexible panel and the image sensor as an intermediary element. This buffer layer absorbs and distributes the stress generated during bending, preventing direct transmission of damaging forces to the image sensor while maintaining the overall flexibility of the device.
Solution Approach 2:
The neutral axis position is adjusted by changing the structural parameters of the flexible panel, specifically by positioning the buffer layer at a specific thickness (e.g., 0.5mm to 2mm) to shift the neutral axis toward the outer surface of the bending portion, thereby reducing tensile stress on critical components.
2Reliability
If buffer layer thickness is increased to reduce stress, then stress protection is improved, but device thickness increases
Solution Approach 1:
The buffer layer thickness is optimized to a specific range (0.5mm to 2mm) to achieve the necessary stress protection while controlling overall device thickness. This parameter optimization balances protective function with compact form factor requirements.
Solution Approach 2:
The buffer layer is selectively positioned only in the bending portion rather than uniformly throughout the entire device. This localized placement provides stress protection exactly where needed during flexing while minimizing the impact on overall device thickness in non-bending areas.
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 auxiliary layer effectively reduces the range of tensile stress regions, increasing the operating lifetime of flexible electronic devices by distributing stress more favorably, thus minimizing damage from bending.
Implementation Method 1
the auxiliary layer is in contact with the predetermined bending portion, and a radius of curvature of the auxiliary layer is greater than a radius of curvature of the predetermined bending portion
Data Source
AI summary
A flexible electronic device including a flexible panel and an auxiliary layer is provided. The flexible panel has a plurality of operation portions, wherein a predetermined bending portion disposed between each adjacent two of the operation portions. The auxiliary layer is disposed on a surface of the flexible panel and at least located above the predetermined bending portion. The predetermined bending portion of the flexible panel may be bent in a first bending state for the auxiliary layer to be in contact with the predetermined bending portion, and a radius of curvature of the auxiliary layer is greater than a radius of curvature of the predetermined bending portion. The flexible electronic device has a first compressive stress region and a first tensile stress region, and a range of the first compressive stress region is greater than a range of the first tensile stress region.