Capacitive Proximity Input Drift Correction Using Simulated Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing input apparatuses for detecting object proximity, such as touch sensors, face challenges in accurately correcting for drift in detection results due to repeated operations and changes in detection intervals, leading to inaccuracies and unnecessary corrections.
Innovation Solution
An input apparatus comprising a detection unit, a drift simulation unit, and a correction unit that generates and corrects detection signals based on a drift simulated signal, which accounts for changes caused by repeated signal generation and interval changes, ensuring accurate proximity detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature and humidity sensors are used to correct capacitance detection results, then external environmental drift is compensated, but internal drift caused by repeated detection operations and circuit heat generation cannot be corrected
Solution Approach 1:
The patent creates a simulation circuit that copies the detection circuit's structure and characteristics, allowing the system to generate drift simulated signals that replicate the internal drift behavior without requiring physical temperature sensors in the detection path. This copying approach enables accurate drift modeling while avoiding the limitations of external sensing.
Solution Approach 2:
The patent introduces drift simulated signals as an intermediary element that mediates between the detection circuit and the correction process. These simulated signals serve as a bridge, carrying information about internal drift characteristics to the correction unit without requiring direct physical measurement of circuit temperature or internal state.
2Measurement precision
If detection signals are continuously generated to monitor drift, then drift correction accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic generation of drift simulated signals at predetermined intervals rather than continuous generation. The correction unit updates correction values only when new drift simulated signals are acquired, creating a rhythmic pattern of detection and correction that reduces overall power consumption while maintaining adequate drift compensation.
Solution Approach 2:
The simulation circuit generates drift simulated signals autonomously based on its internal state and the repetition history of detection operations. This self-service capability allows the system to produce correction data without requiring continuous external stimulation or high-power active sensing, reducing energy requirements.
3Measurement precision
If drift correction is continuously applied, then detection accuracy is maintained, but unnecessary corrections increase when drift is already stabilized
Solution Approach 1:
The correction unit monitors changes in drift simulated signals and applies correction only when significant drift is detected. By using feedback from the simulated signal variations, the system can intelligently determine when correction is necessary and when the drift has stabilized, avoiding unnecessary correction operations and associated energy waste.
Solution Approach 2:
The patent implements dynamic correction timing where the correction operation adapts to the current drift state. The system transitions from frequent correction when drift is changing to reduced correction when drift stabilizes, making the correction process flexible and responsive to actual conditions rather than rigid and continuous.
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
The apparatus effectively corrects for drift in detection signals, improving accuracy and reducing power consumption by stopping unnecessary signal generation when drift stabilization is achieved.
Implementation Method 1
a touch sensor that detects whether, for example, a finger, has touched and a touch pad capable of obtaining information on the contact position. Japanese Patent No. 5677828 discloses a touch operation button that detects a touch operation on the basis of a change in capacitance.
Implementation Method 2
the capacitor charges and discharges every time a detecting operation is performed in a capacitance detection circuit. If the capacitor charges and discharges, a current flows through a resistor in the detection circuit as the electric charges move to generate heat in the detection circuit.
Data Source
AI summary
An input apparatus includes a detection unit that repeatedly generates a detection signal according to a degree of proximity of the object, a drift simulation unit that generates a drift simulated signal that undergoes a change having correlation with a drift in the detection signal due to repeated generation of the detection signal in the detection unit, and a correction unit that corrects the detection signal according to the change in the drift simulated signal at least one of when repeated generation of the detection signal in the detection unit is started and when an interval for repeatedly generating the detection signal in the detection unit is changed.