Compensation Electrode Layout for Reliable Hand Proximity Detection
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Solution Overview
Problem
Existing hand-held devices, such as computer mice and mobile phones, face challenges in efficiently switching between sleeping and active modes due to unreliable wake detection systems, which often mistake conductive surfaces for hands, leading to inefficient energy consumption and frequent battery changes.
Innovation Solution
The implementation of an electrode system with a transmission electrode, a reception electrode, and a compensation electrode, where the compensation electrode is phase-delayed relative to the transmission electrode, allows for reliable detection of hand proximity and orientation by modulating the impedance and alternating electric fields, preventing false activation and enabling precise control of mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a simple capacity sensor wake detector is used to detect hand proximity, then the device can automatically switch from sleeping mode to active mode, but the detector frequently mistakes conductive surfaces for hands causing false activation and increased power consumption
Solution Approach 1:
The wake detector is segmented into three independent electrodes (transmission electrode, reception electrode, and compensation electrode) instead of using a single capacity sensor. This segmentation allows the system to separately measure the electric field interaction with the hand and the compensating interaction with the surface, enabling accurate differentiation between hand proximity and surface contact.
Solution Approach 2:
The compensation electrode acts as an intermediary that measures and compensates for the electric field interaction with the conductive surface. By introducing this intermediate measurement point, the system can subtract the surface effect from the total measurement, isolating the hand proximity signal and eliminating false activations.
2Ease of operation
If the device remains in active mode to ensure responsiveness, then user interaction is immediate, but energy consumption increases and battery life decreases
Solution Approach 1:
The electrode system performs preliminary detection of hand proximity using low-power electric field sensing before fully activating the device. The transmission and reception electrodes continuously monitor for hand approach, and only when detection thresholds are met does the device transition to active mode, ensuring rapid response while maintaining energy efficiency during idle periods.
3Use of energy by moving object
If manual switches are provided for mode switching, then power consumption can be reduced in sleeping mode, but the switching process becomes complicated and users may forget to switch modes
Solution Approach 1:
The device performs self-service by automatically detecting hand proximity through the electrode system and autonomously switching between sleeping and active modes without requiring user intervention. The transmission and reception electrodes continuously monitor the electric field, and the control unit automatically triggers mode transition when hand proximity is detected, combining energy efficiency with operational convenience.
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 energy efficiency by accurately detecting hand proximity and orientation, reducing unnecessary power consumption and extending battery life, while allowing for seamless transitions between sleeping and active modes without manual user intervention.
Implementation Method 1
from the transmission electrode a first electrical alternating field can be radiated
Implementation Method 2
the alternating electric fields can be coupled into the surface and into the reception electrode
Implementation Method 3
the first alternating electric field with respect to the second alternating electric field is phase-delayed
Implementation Method 4
from the compensation electrode a second electrical alternating field can be radiated
Implementation Method 5
the sum of the impedances between the transmission electrode and the reception electrode exceeds a predetermined value
Data Source
AI summary
An electrical hand-held device is provided with improved proximity detection, which can be placed on a surface and has at least one transmission electrode, at least one reception electrode and at least one compensation electrode arranged between transmission electrode and reception electrode. The transmission electrode and the compensation electrode can be supplied with an electric switching signal of predetermined signal frequency and predetermined signal amplitude. Switching electric signal at the compensation electrode is phase-delayed with respect to the switching electric signal at the transmission electrode. Alternating electric fields radiated at the transmission electrode and the compensation electrode generate a current in the reception electrode, which is representative of an approach of a hand to the hand-held device.; The transmission electrode and the reception electrode are arranged in such a way, that the impedance between the transmission electrode and the reception electrode exceeds a predetermined value, which is suitable to keep the current generated in the reception electrode under a predetermined value.