Single Layer Touch Sensor Electrode Routing Optimization
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Solution Overview
Problem
Traditional touch sensors require a large number of electrodes and signal route traces, which occupy valuable space, limit sensor size, and cause performance issues like dropouts and nonlinearities due to the need for multiple layers and complex electrode arrangements.
Innovation Solution
The system arranges drive and sense electrodes in a non-uniform pattern across distinct regions of a single layer touch sensor, allowing for independent operation and reduced interference by using pseudo-random drive electrode arrangements and manipulating signal phases, enabling efficient electric field generation and measurement without the need for extensive signal routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional multi-layer electrode arrangements are used, then sensing coverage is improved, but space occupation and device complexity increase
Solution Approach 1:
The patent transitions from traditional multi-layer vertical stacking to a single-layer planar arrangement, redistributing electrodes across the horizontal plane. Drive electrodes and sense electrodes are arranged in distinct spatial zones within the same layer, eliminating the need for multiple stacked layers while maintaining sensing functionality through optimized two-dimensional electrode positioning.
Solution Approach 2:
The electrode array is segmented into distinct drive electrode regions and sense electrode regions on the same layer. This segmentation allows independent optimization of drive signal routing and sense signal collection, reducing interference between signal types and minimizing the total space required for electrode arrangements.
2Reliability
If multiple signal route traces are used for electrode routing, then electrode connectivity is improved, but trace density and manufacturing complexity increase
Solution Approach 1:
The patent combines drive electrode routing and sense electrode routing into a single-layer architecture, merging the routing functions into unified trace paths where possible. This reduces the total number of separate trace layers and minimizes trace density by eliminating redundant routing structures that would exist in multi-layer designs.
Solution Approach 2:
The patent extracts and separates drive electrode traces from sense electrode traces into distinct routing paths on the same layer. This extraction prevents signal interference between drive and sense lines while maintaining connectivity, reducing the need for complex multi-layer trace arrangements and associated manufacturing complexity.
3Ease of manufacture
If uniform electrode patterns are used, then manufacturing simplicity is improved, but sensing performance and resolution decrease
Solution Approach 1:
The patent implements non-uniform electrode spacing and positioning within the single-layer architecture. Drive electrodes and sense electrodes are positioned with optimized local spacing to maximize sensing resolution in critical regions while maintaining manufacturability. This local optimization of electrode quality allows high precision sensing without requiring uniformly complex patterns across the entire sensor surface.
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 approach reduces the number of electrodes and signal traces required, allowing for larger touch sensors with improved performance by enabling independent operation of regions and localized sensing, thus enhancing sensitivity and resolution.
Implementation Method 1
a first set of row electrodes 12 are driven with a first signal from P, N generator 22, and a different but adjacent second set of row electrodes are driven with a second signal
Implementation Method 2
When a pointing object creates imbalance because of capacitive coupling when the object approaches or touches a touch surface (the sensing area 18 of the touchpad 10), a change in capacitance occurs on the electrodes 12, 14.
Data Source
AI summary
A system and method for reducing the number of electrodes needed to operate a touch sensor by arrangement of drive and sense electrodes on a single layer touch sensor, the electrodes being arranged such that drive signals that are sent to the electrodes are sent in a non-uniform pattern that enables selected regions of the touch sensor to generate a useful drive signal while the remaining regions do not. The arrangement of the drive and sense electrodes is such that the routing of signals to and from the electrodes may not interfere with operation of the touch sensor.