Non-uniform Pressure Actuation Threshold for Capacitance Sensing
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Solution Overview
Problem
Existing capacitance sensing systems struggle to accurately determine whether a pressure threshold is exceeded, especially in non-uniform pressure scenarios, as they rely on fixed threshold values that do not account for variations in pressure sensitivity across different locations on a touch surface.
Innovation Solution
A capacitance sensing module with a processor and memory that determines the location of a user input and assesses whether the pressure value exceeds a non-uniform actuation threshold value, which varies based on the location, using multiple pressure sensors to provide haptic responses and adjust threshold values based on distances from the sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed pressure threshold value is used in capacitance sensing systems, then the system structure remains simple, but the measurement precision deteriorates because the fixed threshold cannot account for variations in pressure sensitivity across different locations on the touch surface
Solution Approach 1:
The patent implements location-dependent threshold values where different regions of the touch surface have different pressure thresholds based on their distance from the pressure sensor. This local quality approach allows each region to have optimized threshold settings that account for variations in pressure sensitivity, thereby improving measurement precision without requiring a completely complex system redesign
Solution Approach 2:
The system dynamically determines threshold values based on the detected location of the user input rather than using a static fixed threshold. The threshold is adjusted in real-time according to the distance from the pressure sensor, enabling the system to adapt to varying pressure sensitivity conditions while maintaining reasonable system complexity through algorithmic adjustment rather than hardware complexity
2Adaptability or versatility
If multiple pressure sensors are used to determine location and provide haptic responses, then the adaptability and user interaction quality improve, but the device complexity increases
Solution Approach 1:
The pressure sensor serves multiple functions: it detects pressure magnitude, determines the location of user input based on which sensor element is activated, and provides haptic feedback through the same mechanical structure. This multi-functionality approach improves adaptability and user interaction quality while minimizing the need for additional separate components, thereby controlling device complexity
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 solution enables precise detection of pressure thresholds across a touch surface, ensuring accurate haptic responses and improved user interaction by accounting for non-uniform pressure sensitivity, enhancing the overall performance of capacitance sensing systems.
Implementation Method 1
determine, with the capacitance sensor, a location of a user input
Implementation Method 2
determine, with the pressure sensor, a pressure value of the user input applied to the capacitance sensor
Implementation Method 3
The pressure sensor may be a piezoelectric device configured to apply a haptic response to the capacitance sensor
Data Source
AI summary
A capacitance sensing module may include a capacitance sensor; a pressure sensor in mechanical communication with the capacitance sensor; a processor and memory; programmed instructions stored in the memory to cause the processor, when executed, to determine, with the capacitance sensor, a location of a user input; determine, with the pressure sensor, a pressure value of the user input applied to the capacitance sensor; and determine whether the pressure value exceeds a non-uniform actuation threshold value where the non-uniform actuation threshold value is based, at least in part, on the location of the user input on the capacitance sensor.