Side-force detection in capacitive input devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing input devices with capacitive sensors struggle to accurately detect side-forces and grip types, as they rely on complex signal processing and threshold comparisons that are prone to errors due to transient conditions and constant changes caused by user interactions.
Innovation Solution
The method involves detecting capacitive responses from both side and center sensor electrodes to determine the magnitude of side-forces by analyzing the number and magnitude of responses, and classifying grip types by comparing metrics across zones over time, using adaptive thresholds to differentiate between grip and un-grip states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex signal processing and threshold comparisons are used to detect side-forces, then detection capability is enhanced, but error rate increases due to transient conditions and constant changes
Solution Approach 1:
The patent applies preliminary action by comparing capacitive responses from multiple zones (side zones vs. center zones) before making a final grip detection determination. The system proactively establishes baseline capacitance values from center zones and compares incoming side zone responses against these pre-established references, allowing the system to anticipate and filter out transient variations before they cause false detections.
Solution Approach 2:
The patent implements feedback by continuously monitoring capacitive responses from multiple zones and using the center zone responses as a reference feedback mechanism. The system adjusts its detection thresholds dynamically based on the relationship between center zone baseline capacitance and side zone measured capacitance, creating a self-regulating detection system that adapts to changing conditions and reduces false positives.
2Reliability
If adaptive thresholds are used to differentiate grip states, then false positives are reduced, but processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the sensor electrode array into distinct functional zones: side zones for detecting grip presence and center zones for establishing baseline capacitance. This spatial segmentation allows independent processing of reference signals (center zones) and measurement signals (side zones), simplifying the overall detection logic while improving reliability through zone-specific capacitance comparisons.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting detection thresholds based on the measured capacitance values from center zones. Rather than using fixed thresholds, the system modifies its detection parameters adaptively - comparing side zone capacitance changes against baseline values derived from center zone measurements, thereby optimizing detection sensitivity while maintaining processing efficiency.
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 accuracy of side-force detection and grip type classification, reducing false positives and negatives by stabilizing signal analysis and accounting for variable user interactions, thereby improving the reliability of input device feedback.
Implementation Method 1
detecting first capacitive responses corresponding to a first plurality of sensor electrodes disposed near the side of the input device
Data Source
AI summary
An example a method of detecting a force applied to a side of an input device including sensor electrodes, the method including: detecting first capacitive responses corresponding to a first plurality of sensor electrodes disposed near the side of the input device; detecting second capacitive responses corresponding to a second plurality of sensor electrodes disposed near a center of the input device; and determining a magnitude of the force applied to the side of the input device based on at least one of: a number of the second capacitive responses satisfying a first threshold; or magnitudes of the second capacitive responses.