Flexible Touch Sensor Curved Region Stress Reduction
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Solution Overview
Problem
Flexible touch sensor devices face failure due to stress applied when bent or folded, particularly in the conductive layers, limiting their portability and implementation in large-scale screen displays.
Innovation Solution
The design includes a first touch sensing region and a second touch sensing region with specific electrode configurations and connection structures, where the second touch sensing region is deformable and curved along a curvature axis, reducing stress on the conductive layers by varying the curvature radius and connection angles, thereby minimizing the risk of failure during deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a flexible touch sensor device uses a plastic substrate to achieve flexibility and light weight, then portability and impact resistance are improved, but the device is susceptible to stress-induced failure when bent or folded
Solution Approach 1:
The touch sensor device is divided into a first touch sensing region with a flat conductive layer and a second touch sensing region with a curved conductive layer. This segmentation allows different regions to handle stress differently, with the curved region specifically designed to accommodate bending and folding without causing failure in the conductive layer.
Solution Approach 2:
The conductive layer has different local properties: the first region is flat and optimized for touch sensitivity, while the second region is curved with a specific curvature radius optimized for stress distribution during deformation. This local quality differentiation ensures that each region performs its function while minimizing overall stress on the device.
2Adaptability or versatility
If the touch sensor device is made flexible to enable portability and large-scale screen implementation, then ease of operation and adaptability are improved, but the conductive layer becomes vulnerable to stress-induced failure
Solution Approach 1:
The second touch sensing region features a curved conductive layer with a specifically designed curvature radius. This curvature allows the conductive layer to flex and deform without creating stress concentration points that would lead to failure, enabling the device to be bent and folded while maintaining conductive layer integrity.
Solution Approach 2:
The device structure accommodates dynamic deformation through the curved region design. When the device is bent or folded, the curved conductive layer dynamically adjusts its shape within the designed curvature parameters, allowing reversible deformation without permanent damage or failure.
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 configuration effectively reduces stress on the conductive layers, preventing failure and allowing the touch sensor to function normally even when deformed, enhancing portability and usability in flexible electronic devices.
Implementation Method 1
the third touch electrode forms a self-capacitive type sensor
Data Source
AI summary
A touch sensor device includes a first touch sensing region and a second touch sensing region, wherein each of the first touch sensing region and the second touch sensing region includes a plurality of first touch electrodes and a plurality of second touch electrodes, first connection portions each connecting two adjacent first touch electrodes among the plurality of first touch electrodes, and second connection portions each connecting two adjacent second touch electrodes among the plurality of second touch electrodes, wherein the second touch sensing region includes a plurality of third touch electrodes; and a plurality of touch wires respectively connected to the plurality of third touch electrodes, the plurality of third touch electrodes are separated from each other, and the third touch electrode forms a self-capacitive type sensor, the plurality of third touch electrodes border an outside edge of where the plurality of first and second touch electrodes are disposed.