Foldable Panel Protective Layer for Stress Absorption and Delamination Control
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Solution Overview
Problem
Electronic devices face reliability issues due to external impacts and stresses, particularly when folded, as existing designs struggle to absorb and distribute folding stresses effectively, leading to potential delamination and reduced impact resistance.
Innovation Solution
An electronic device design featuring a protective member with a base layer having a glass transition temperature higher than PET, a cushion layer with a porous structure, and an adhesive member that couples the electronic panel to the protective member, allowing for stable absorption and distribution of folding stresses without delamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional protective member with standard materials is used, then the device structure remains simple, but the impact resistance and reliability under folding stress are insufficient
Solution Approach 1:
The protective member uses a composite structure consisting of a base layer (PET or PI material) and a cushion layer (porous polymer foam). This composite design combines the dimensional stability of the base layer with the shock-absorbing properties of the porous cushion layer, achieving improved impact resistance and folding stress distribution without excessive complexity.
Solution Approach 2:
The cushion layer is designed with a porous structure having a porosity of 30% to 90%. This porous configuration enables the layer to effectively absorb and distribute folding stresses and external impacts through compression and expansion of the pores, significantly improving reliability while maintaining a relatively simple overall structure.
2Stability of the object's composition
If the base layer material has low glass transition temperature, then the manufacturing process is easier, but the thermal stability and dimensional consistency during folding are reduced
Solution Approach 1:
The base layer material is selected with a glass transition temperature of at least 70°C (preferably at least 80°C), such as PET (glass transition temperature of 70°C to 90°C) or PI (glass transition temperature of 200°C to 400°C). This parameter selection ensures dimensional stability and resistance to deformation under folding stress and temperature variations, while remaining compatible with standard manufacturing processes.
3Strength
If the adhesive member has strong bonding force, then the coupling between electronic panel and protective member is stronger, but the risk of delamination under folding stress increases
Solution Approach 1:
The adhesive member is positioned specifically between the base layer and the electronic panel, creating a localized bonding interface. This allows the adhesive to provide strong bonding strength at the critical interface while the porous cushion layer absorbs and distributes folding stresses, preventing stress concentration at the adhesive interface and reducing delamination risk.
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 design enhances the reliability and impact resistance of electronic devices by effectively absorbing and distributing folding stresses, improving their physical properties and preventing delamination, thus ensuring stability during repeated folding operations.
Implementation Method 1
a cushion layer contacting a bottom surface of the base layer and having a porous structure
Implementation Method 2
an adhesive member coupling the electronic panel to the protective member
Data Source
AI summary
An electronic device includes an electronic panel configured to be folded along a folding axis extending in one direction, a flexible window member on a top surface of the electronic panel, a protective member on a bottom surface of the electronic panel, the protective member including a base layer including a material that has a glass transition temperature higher than a glass transition temperature of polyethylene terephthalate (PET), and a cushion layer contacting a bottom surface of the base layer and having a porous structure, and an adhesive member coupling the electronic panel to the protective member.