Touch Sensor Double-Layer Electrode Layout for Signal Interference
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Solution Overview
Problem
Current touch sensors face challenges in maintaining mechanical and electrical reliability, especially with increased trace density leading to signal interference and damage from mechanical stress, while requiring high-resolution sensing capabilities.
Innovation Solution
A touch sensor design featuring a double-layered structure with alternately distributed traces and sensing electrodes, where the first traces are connected to both ends of the sensing electrode rows and the second traces branch from the sensing electrode columns, with specific width constraints and an intermediate trace configuration to enhance spacing and electrical connection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of traces is increased to achieve high-resolution sensing, then the sensing resolution is improved, but the margin between adjacent traces decreases and signal interference occurs
Solution Approach 1:
The patent transitions from a single-layer trace layout to a multi-layer electrode structure where sensing electrodes are arranged in multiple layers (first electrode layer and second electrode layer) with different orientations. This dimensional change allows traces to be distributed across multiple layers, increasing the effective spacing between adjacent traces in the three-dimensional space while maintaining high sensing resolution in the two-dimensional sensing plane.
2Measurement precision
If the density of traces is increased to achieve high-resolution sensing, then the sensing resolution is improved, but the traces are easily damaged by mechanical stress
Solution Approach 1:
By distributing traces across multiple layers with different orientations (first electrode layer with rows in first direction, second electrode layer with columns in second direction), the patent reduces the mechanical stress concentration on any single trace. The multi-layer configuration provides structural redundancy and distributes mechanical loads more evenly, improving overall mechanical reliability while maintaining high sensing resolution.
3Reliability
If the pitch between traces is increased to reduce signal interference, then the electrical reliability is improved, but the sensing resolution decreases
Solution Approach 1:
The patent resolves this contradiction by utilizing the third dimension (vertical layering) to increase the effective pitch between traces. Traces in different layers can be positioned closer together in the horizontal plane while maintaining adequate spacing in the vertical direction, thereby achieving both high electrical reliability (reduced signal interference) and high sensing resolution through the multi-layer electrode configuration.
Data Source
AI summary
A touch sensor according to an embodiment of the present invention includes a base layer, a first electrode layer disposed on the base layer, and a second electrode layer disposed at an upper level of the first electrode layer. The first electrode layer includes a plurality of first sensing electrode rows extending in a first direction parallel to a top surface of the base layer, and first traces branched from each of the first sensing electrode rows and alternately distributed on both lateral portions of the base layer. The second electrode layer includes a plurality of second sensing electrode columns extending in a second direction that is parallel to the top surface of the base layer and intersects the first direction, and second traces branching from the second sensing electrode columns.