Multi-Electrode Capacitive Button Actuation to Prevent False Inputs
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Solution Overview
Problem
Current capacitive sensing devices, particularly capacitive buttons, face limitations in distinguishing between intended and unintended inputs, leading to false actuations and reduced performance.
Innovation Solution
The use of multiple sensor electrodes with distinct sensor electrodes and a controller that generates electrode values based on capacitive coupling changes to determine actuation status, incorporating positional characteristics and disambiguating electrodes to differentiate between valid and invalid inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensor electrode elements are used to improve input detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The capacitive button is divided into multiple sensor electrode elements (at least three) that are spatially segmented and independently monitored. Each electrode element tracks the movement of input objects separately, allowing the system to detect whether objects are moving together (intended input) or independently (unintended input), thereby improving measurement precision through spatial segmentation.
Solution Approach 2:
The system continuously monitors the relative positions of input objects across multiple sensor electrode elements and provides feedback by comparing their movement patterns. When the relative positions change beyond a threshold, the system identifies this as unintended input and prevents false actuation, creating a feedback loop that enhances detection accuracy without requiring complex additional hardware.
2Reliability
If multiple sensor electrode elements with distinct electrodes are implemented, then false actuations are reduced, but manufacturing complexity increases
Solution Approach 1:
The multiple sensor electrode elements serve multiple functions simultaneously: they detect intended inputs, identify unintended inputs through relative position monitoring, and prevent false actuations. This multi-functionality approach reduces the need for separate verification mechanisms, simplifying the overall manufacturing process while maintaining high reliability.
Solution Approach 2:
The patent combines the functions of multiple sensor electrode elements into a single capacitive button structure, where all elements work together as an integrated unit. The controller processes signals from all electrodes simultaneously, merging detection and verification functions into one cohesive system that is easier to manufacture than separate independent sensing mechanisms.
3Measurement precision
If relative position monitoring of input objects is implemented, then intended vs unintended input differentiation is improved, but processing complexity increases
Solution Approach 1:
The system monitors the relative positions of input objects but only triggers complex processing when necessary - specifically when the relative positions change beyond a predetermined threshold. For normal intended inputs where relative positions remain stable, the system uses simpler detection paths, reducing overall processing complexity while maintaining high differentiation accuracy when needed.
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 input detection, reduces false actuations, and improves the overall performance of capacitive buttons by effectively distinguishing between intended and unintended inputs.
Implementation Method 1
a coupling condition concerning a change in capacitive coupling of the at least three distinct sensor electrodes of the capacitive button
Data Source
AI summary
Methods for determining actuation of a capacitive button are described. In some embodiments, indicia from the at least three distinct sensor electrodes associated with at least three sensor electrode elements comprising the capacitive button are received, the indicia indicative of interaction of an input object with the at least three distinct sensor electrodes. The actuation of the capacitive button is then determined, based at least in part on satisfying a set of criteria comprising: a location condition concerning a location of the input object relative to a center of the capacitive button, and a coupling condition concerning a change in capacitive coupling of the at least three distinct sensor electrodes associated with the at least three sensor electrode elements comprising the capacitive button.