Touch Sensor Layered Electrodes Reduce Dead Zones
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Solution Overview
Problem
Existing touch sensors face challenges in achieving uniform visibility and high sensitivity while minimizing dead zones and electromagnetic interference, which affects their ability to detect fine and weak touch inputs effectively.
Innovation Solution
The design incorporates sensor electrodes and lines on separate layers with conductive patterns and branch wires, along with insulating layers, to ensure uniform sensitivity and visibility, reduce contact resistance, and minimize the dead zone, allowing for higher touch sensitivity and expanded sensing areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor electrodes and sensor lines are disposed on the same layer, then the structure is simple, but the sensitivity is reduced due to dead zones and electromagnetic interference
Solution Approach 1:
The patent applies dimensionality change by moving sensor lines from the same layer as sensor electrodes to a different layer (lower layer), creating a three-dimensional spatial separation. This layer differentiation eliminates dead zones and electromagnetic interference while maintaining electrical connectivity through vertical contact portions, thereby improving touch sensitivity without excessive complexity.
Solution Approach 2:
The patent segments the sensor structure into distinct layers: sensor electrodes on one layer and sensor lines on another layer. This segmentation separates the functional components spatially, reducing electromagnetic interference and dead zones, while contact portions provide the necessary electrical connection between layers.
Data Source
AI summary
According to one or more embodiments of the invention, a touch sensor includes: a first substrate; sensor electrodes spaced apart from each other on a first layer on one surface of the first substrate; sensor lines disposed on a second layer different from the first layer; contact portions electrically connecting a sensor electrode of the sensor electrodes to a sensor line of the sensor lines; and branch wires overlapping the sensor electrode and connecting the contact portions corresponding to the sensor electrode to each other.