Dynamic Click Threshold Adjustment for Force-Based Tactile Sensors
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Solution Overview
Problem
Conventional touch-based sensing technologies struggle with accurately detecting clicks due to variability in force measurements across the sensor surface and over time, leading to high click thresholds that require excessive force for registration, resulting in accidental clicks.
Innovation Solution
A system with a motion detection component dynamically adjusts the click and unclick thresholds based on the speed of motion detected by force-based tactile sensors, reducing accidental clicks by modifying sensitivity accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high click thresholds are used to avoid accidental clicks, then reliability is improved, but ease of operation deteriorates due to excessive force being required
Solution Approach 1:
The patent applies dynamics by making the click threshold adaptive rather than fixed. The threshold dynamically adjusts based on the rate of change of the applied force, allowing the system to distinguish between intentional clicks and accidental presses. When the force changes rapidly (indicating an intentional click), the threshold is lowered to enable easy registration. When the force changes slowly (indicating accidental pressure), the threshold remains high to prevent false detections.
Solution Approach 2:
The patent changes the parameter of click threshold based on the rate of change of applied force. Instead of using a static threshold, the system modifies the threshold parameter dynamically according to the temporal characteristics of the force application. This allows the same physical sensor to exhibit different sensitivity levels depending on the context, resolving the contradiction between reliability and ease of operation.
2Measurement precision
If force-based tactile sensors are used to improve measurement precision, then reliability is improved, but device complexity increases due to variability in force measurements
Solution Approach 1:
The patent implements feedback by continuously monitoring the rate of change of the applied force and using this information to adjust the click threshold in real-time. The system feeds back the temporal characteristics of the force signal to the threshold determination mechanism, creating a closed-loop system that adapts to different usage scenarios. This feedback mechanism simplifies the overall system by using the sensor's own output to control its sensitivity.
Solution Approach 2:
The patent substitutes complex mechanical or hardware-based solutions for simpler software-based processing. Instead of using multiple sensors or complex mechanical structures to eliminate variability, the system uses computational methods to process the force signal and dynamically adjust thresholds based on the rate of change. This replaces potential hardware complexity with algorithmic complexity, achieving the same goal with fewer physical components.
Data Source
AI summary
Facilitating dynamic adjustment of a click/unclick threshold corresponding to a force-based tactile sensor is presented herein. A system can comprise a tactile sensor comprising force-based sensor(s); and a motion detection component that can determine a rate of change of a movement that has been detected via a group of sensors comprising the force-based sensor(s), and based on the rate of change of the movement, modify a defined sensitivity of the force-based sensor(s) with respect to detection of a click and/or unclick event corresponding to the tactile sensor. Further, the motion detection component can decrease the defined sensitivity with respect to detection of the click and/or unclick event in response to the rate of change being determined to satisfy a defined condition representing an increase in the speed at which the stylus or the finger has moved across the tactile sensor.