Flexible Touch Screen Panel with Segmented Electrode Stacks
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Solution Overview
Problem
Conventional touch screen panels face mechanical bending stress issues when subjected to repeated bending, folding, or twisting, which can lead to deterioration in touch input detection and device durability.
Innovation Solution
A flexible touch screen panel design featuring a thin film substrate with distinct sections: a flexible section for intentional bending and a non-flexible section to reduce mechanical stress, where the flexible section has a thinner, more flexible structure with different stack structures for sensing electrodes to enhance durability and maintain touch input accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a uniform thick stack structure is used across the entire touch screen panel, then structural strength and stability are improved, but mechanical bending stress increases and flexibility deteriorates
Solution Approach 1:
The patent applies different stack structures to different regions: the first section (flexible region) has a thinner stack structure with fewer layers, while the second section (rigid region) has a thicker stack structure with more layers. This local differentiation allows the flexible region to bend easily while the rigid region provides structural support, resolving the contradiction between overall strength and local flexibility.
Solution Approach 2:
The touch screen panel is divided into two distinct sections with different stack structures. The first section is designed for flexibility with reduced layers, while the second section provides rigidity with complete layers. This segmentation allows each region to optimize its properties independently, achieving both flexibility where needed and strength where required.
2Adaptability or versatility
If a thin film substrate is used to improve flexibility, then adaptability is improved, but mechanical bending stress concentration increases
Solution Approach 1:
The patent implements a thin film substrate with spatially varying thickness and composition. The flexible region uses a thinner substrate configuration that allows bending, while the rigid region maintains a thicker, more robust structure. This local quality variation reduces stress concentration by allowing the thin regions to flex without compromising the overall structural integrity provided by the thicker regions.
3Stress or pressure
If the stack structure is made thinner to reduce bending stress, then mechanical stress is reduced, but structural strength and stability deteriorate
Solution Approach 1:
The patent segments the stack structure into two functional zones: a flexible zone with reduced thickness that experiences bending stress, and a rigid zone with full thickness that provides structural support. This segmentation ensures that the thinned structure only appears where bending occurs, while the supported areas maintain full structural integrity, resolving the contradiction between stress reduction and strength maintenance.
Data Source
AI summary
A flexible touch screen panel includes a thin film substrate including a first section and a second section and first sensing electrodes disposed in the first section and the second section, the first sensing electrodes being connected to one another along a first direction. The first sensing electrodes include a first stack structure in the first section and a second stack structure in the second section, the second stack structure being different from the first stack structure.