Folding Display Sensing Sensor Stress Management
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Solution Overview
Problem
Existing electronic apparatuses with sensing sensors face challenges in maintaining reliability and folding performance due to stress-induced cracks in the sensing coils and cover layers during folding operations.
Innovation Solution
The electronic apparatus incorporates a sensing sensor design with a base layer, first and second sensing coils, and cover layers made of specific materials like polyimide and synthetic rubber, where the cover layers have a modulus less than the base layer, and an adhesive layer to reduce stress and prevent cracks during folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a sensing sensor with rigid cover layers is used, then manufacturing precision and structural stability are improved, but folding performance deteriorates due to stress-induced cracks
Solution Approach 1:
The patent changes the material parameter (modulus) of the cover layer to be less than that of the base layer. This parameter change allows the cover layer to be more flexible and better withstand folding stresses, preventing cracks while maintaining structural stability during manufacturing and operation.
Solution Approach 2:
The patent uses composite material structure with at least two different materials for the base layer and cover layer. The base layer provides structural support while the cover layer with lower modulus provides flexibility and crack resistance during folding, achieving both manufacturing precision and folding performance.
2Strength
If adhesive layers are added to bond components, then structural integrity is improved, but device complexity increases
Solution Approach 1:
The patent introduces an adhesive layer as an intermediary between the base layer and cover layer. This adhesive layer bonds the two structural layers together, improving structural integrity and preventing delamination during folding, while the bonding function is achieved through a single specialized layer rather than multiple complex mechanisms.
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
This design enhances the folding performance and reliability of the electronic apparatus by minimizing stress on the sensing sensor components, preventing cracks, and maintaining sensor functionality across folding cycles.
Implementation Method 1
the first cover layer has a modulus less than a modulus of the first base layer
Implementation Method 2
an adhesive layer disposed between the first base layer and the first cover layer to cover the first sensing coils, where the adhesive layer may bond the first base layer to the first cover layer
Data Source
AI summary
An electronic apparatus includes a display module divided into a first non-folding area, a folding area foldable along an imaginary folding axis extending in a second direction crossing a first direction, and a second non-folding area, which are sequentially arranged in the first direction, and a sensing sensor including a first base layer disposed under the display module, first sensing coils disposed on the first base layer, second sensing coils insulated from the first sensing coils, and a first cover layer disposed between the first sensing coils and the second sensing coils. The first cover layer has a modulus less than a modulus of the first base layer.