Touch Panel Flexible Wiring Board Spacer for Peeling Resistance
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Solution Overview
Problem
The existing connection structure of flexible wiring boards in touch panels is prone to peeling from the lead-out wiring when bent, leading to unstable conduction and difficulty in detecting touch positions.
Innovation Solution
A touch panel design that includes a spacer member abutting both the connector portion of the flexible wiring board and the cover sheet, preventing peeling by distributing bending forces and maintaining a stable conduction state, with the spacer member being preferably a film body or resin adhesive material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the flexible wiring board is bent to connect to the external circuit, then the connection between the flexible wiring board and the lead-out wiring is established, but a peeling force is generated at the connecting place causing the flexible wiring board to be easily peeled from the lead-out wiring
Solution Approach 1:
The patent introduces a connector portion as an intermediary component between the flexible wiring board and the lead-out wiring. This connector portion includes a connector substrate with connection terminals that electrically connect to the lead-out wiring, and the flexible wiring board connects to these terminals. This intermediary structure distributes the mechanical stress and electrical connection points, preventing direct peeling forces from acting on the lead-out wiring attachment points, thereby maintaining connection stability while allowing flexibility.
2Reliability
If the flexible wiring board is fixed onto the lead-out wiring, then electrical conduction is established, but the connection becomes vulnerable to peeling under bending stress and environmental conditions
Solution Approach 1:
The patent segments the connection structure into multiple independent components: the lead-out wiring on the substrate, the connector substrate with multiple connection terminals, and the flexible wiring board. This segmentation distributes the mechanical and electrical loads across multiple discrete connection points rather than a single vulnerable joint. Each segment can move and deform independently, reducing stress concentration and preventing catastrophic failure from peeling forces.
3Ease of manufacture
If a simple connection structure is used between the flexible wiring board and the lead-out wiring, then manufacturing is simplified, but the connection becomes unstable under bending and environmental stress
Solution Approach 1:
The patent employs a nested structure where the connector substrate is positioned within or adjacent to the substrate containing the lead-out wiring, and the flexible wiring board is connected to the connector substrate. This nested arrangement creates a layered, modular connection system that is relatively simple to manufacture using standard PCB and wiring board fabrication techniques, while the multi-layer nested structure itself provides mechanical stability and stress distribution to prevent peeling under bending and environmental conditions.
Data Source
AI summary
A touch panel includes a first planar body having a first electrode patterned on one surface of a first substrate and a first lead-out wiring electrically connected to the first electrode, a cover sheet, a second planar body provided between the first planar body and the cover sheet except a predetermined region of a side edge of the first substrate, and a flexible wiring board interposed at a gap portion formed between the predetermined region of the side edge of the first substrate and the cover sheet, wherein the flexible wiring board includes a connector portion fixed onto the connection terminal of the first lead-out wiring held by the first planar body and electrically connected with the first lead-out wiring, and a spacer member that abuts with both the connector portion and the cover sheet is disposed between the connector portion and the cover sheet.