Capacitive Side Position Extrapolation for Input Devices
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Solution Overview
Problem
Existing input devices struggle to accurately detect the presence of input objects proximate to the side surfaces, as current capacitive sensing technologies rely heavily on surface interactions, limiting the detection of objects near or touching the side surfaces.
Innovation Solution
A processing system configured for capacitive side touch response extrapolation, which acquires both mutual and absolute capacitive measurements and compares them to detect the presence of input objects proximate to the side surfaces, enabling accurate detection and reporting of input objects regardless of their position relative to the surface sensing region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional surface-based capacitive sensing is used, then the device structure remains simple, but the detection capability is limited to objects touching or near the surface sensing region
Solution Approach 1:
The patent extends capacitive sensing from the traditional 2D surface plane into the 3D spatial volume by detecting capacitive effects in the space above and around the device surfaces. This is achieved by monitoring capacitive coupling between sensor electrodes and input objects in three-dimensional space, enabling detection of objects approaching from various directions including side surfaces, thereby adding a vertical and lateral detection dimension beyond conventional surface-only sensing.
Solution Approach 2:
The patent makes the existing sensor electrodes multi-functional by enabling them to detect both traditional surface touches and side surface approaches using the same hardware infrastructure. The sensor electrodes serve dual purposes: detecting objects on the primary surface sensing region and detecting objects near side surfaces through capacitive coupling, eliminating the need for separate sensing mechanisms and achieving versatile detection capability with existing components.
2Adaptability or versatility
If sensor electrodes are added to side surfaces, then side surface detection is enabled, but the device structure and manufacturing complexity increase
Solution Approach 1:
The patent makes the existing sensor electrodes multi-functional by enabling them to detect both traditional surface touches and side surface approaches using the same hardware infrastructure. The sensor electrodes serve dual purposes: detecting objects on the primary surface sensing region and detecting objects near side surfaces through capacitive coupling, eliminating the need for separate sensing mechanisms and achieving versatile detection capability with existing components.
Solution Approach 2:
The patent creates a virtual extension of the surface sensing region into the surrounding three-dimensional space by utilizing capacitive field interactions. Instead of physically copying the sensing region onto side surfaces, the system uses the capacitive coupling effects to replicate detection capability in the spatial volume adjacent to side surfaces, effectively projecting the sensing function into 3D space without additional physical sensors.
3Measurement precision
If only absolute capacitive measurement is used, then the sensing system is simple, but side surface detection accuracy is insufficient
Solution Approach 1:
The patent merges absolute capacitive measurement and mutual capacitive measurement into a unified detection system. By combining these two measurement modalities and comparing their results, the system achieves enhanced side surface detection accuracy. The integration of both measurement types allows the system to distinguish between surface touches and side surface approaches more reliably than either method alone.
Solution Approach 2:
The patent implements a feedback mechanism by continuously comparing absolute capacitive measurements with mutual capacitive measurements. This comparison provides feedback that helps the system determine whether an input object is present on the surface or near the side surfaces. The feedback loop enables real-time adjustment and refinement of detection decisions based on the combined information from both measurement types, improving overall detection accuracy.
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 enhances the usability of input devices by accurately detecting input objects near the side surfaces, improving the overall interaction capabilities with electronic systems by enabling detection beyond traditional surface interactions.
Implementation Method 1
sensor circuitry with functionality to drive sensing signals on multiple sensor electrodes of a sensing region, acquire a mutual capacitive measurement including effects of the sensing signals
Implementation Method 2
perform a comparison of the mutual capacitive measurement and the absolute capacitive measurement, and detect a presence of an input object proximate to a side surface of an input device based on the comparison
Data Source
AI summary
A method for capacitive sensing includes acquiring a mutual capacitive measurement including effects of sensing signals of a sensing region, and acquiring an absolute capacitive measurement including effects of the sensing signals. The method further includes performing a comparison of the mutual capacitive measurement and the absolute capacitive measurement, and detecting a presence of an input object proximate to a side surface of an input device based on the comparison. The side surface is at least substantially orthogonal to the sensing region on the input device. The method further includes reporting the presence of the input object.