Capacitive Sensing Electrode Clustering for Low Ground Mass Detection
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Solution Overview
Problem
Traditional capacitive sensing techniques face difficulties in detecting input objects with low ground mass, such as water drops or moisture, due to challenges in accurately determining signal values and generating a reliable profile of the sensing region.
Innovation Solution
The input device operates electrodes as different clusters during distinct timeslots, with at least one electrode functioning as both a transmitter and a receiver, allowing for the determination of signal values across multiple clusters to generate a profile that reflects the presence and location of input objects within the sensing region, even under low ground mass conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional capacitive sensing techniques are used, then the sensing operation is simple, but the detection precision for low ground mass objects deteriorates
Solution Approach 1:
The sensing operation is segmented into multiple timeslots where different subsets of electrodes are activated as transmitters or receivers. This segmentation allows the system to collect multiple measurements from different electrode combinations, improving detection precision for low ground mass objects while managing complexity through structured temporal division.
Solution Approach 2:
The system employs periodic action by cycling through different electrode configurations in repeated timeslots. Each timeslot activates specific electrodes as transmitters or receivers in a periodic sequence, enabling multiple measurements to be taken over time and combined to enhance detection precision without requiring all electrodes to be simultaneously active.
2Reliability
If multiple electrode clusters are operated simultaneously, then the signal-to-noise ratio improves, but the device complexity increases
Solution Approach 1:
Multiple electrode clusters are operated periodically across different timeslots rather than simultaneously. Each timeslot activates a specific cluster configuration, and the results are combined to achieve improved signal-to-noise ratio. This periodic operation maintains reliability while managing device complexity through temporal separation of cluster operations.
3Adaptability or versatility
If electrodes are reconfigured as different clusters, then the detection capability for various input objects improves, but the operation time increases
Solution Approach 1:
The electrode array is segmented into multiple clusters that can be independently configured and activated in different timeslots. This segmentation enables the system to adapt to different input object detection requirements by selecting appropriate cluster configurations, while managing operation time through efficient temporal scheduling of cluster activations.
Solution Approach 2:
Different electrode clusters are activated periodically across successive timeslots, allowing the system to gather detection data from multiple configurations without requiring permanent reconfiguration. This periodic switching provides adaptability for detecting various input objects while limiting the time penalty through structured, repeating cycles.
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 enhances the detection of input objects with low ground mass by improving the signal-to-noise ratio and reducing shape distortion in the sensing region profile, ensuring accurate detection and tracking of input objects.
Implementation Method 1
A transmitter electrode may be modulated with a transmitter signal that generates an electric field that extends through a sensing region
Implementation Method 2
A receiver electrode may be used to detect changes in an electric field
Data Source
AI summary
An input device including a sensing region is disclosed. The input device includes: sensor circuitry configured to: operate, during a first timeslot, electrodes as a first cluster; and operate, during a second timeslot, the electrodes as a second cluster, where the electrodes are aligned with an axis, and where at least one of the electrodes operates as a transmitter in the first cluster and as a receiver in the second cluster; and determination circuitry configured to: determine a first set of signal values associated with a first set of electrodes in the first cluster; determine a second set of signal values associated with a second set of electrodes in the second cluster; and generate a profile for the sensing region based on the first set of signal values and the second set of signal values, where the profile reflects an input object in the sensing region.