Proximity Detection Circuit With Reference Compensation for Sensor Drift
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Solution Overview
Problem
Proximity sensors in electronic devices are affected by environmental factors such as temperature and humidity, leading to misjudgments in proximity events.
Innovation Solution
A proximity detection method and circuit that generates a proximity signal based on detection data, baseline data, and a proximity threshold, with compensation for environmental factors by correcting the baseline data or proximity threshold using reference data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proximity sensors are used to detect human body proximity, then proximity detection function is achieved, but misjudgment occurs due to environmental factors affecting capacitance
Solution Approach 1:
The patent introduces a reference electrode as an intermediary element that is affected by environmental factors in the same way as the sensing electrode but not by human body proximity. By comparing the capacitance values of both electrodes, the system can isolate and eliminate environmental factor influences, thereby improving proximity detection accuracy.
Solution Approach 2:
The patent implements a feedback mechanism where the capacitance value from the reference electrode is used to compensate for environmental factor effects on the sensing electrode's capacitance value. This feedback loop allows the system to dynamically adjust for environmental changes, reducing misjudgment and improving reliability.
2Measurement precision
If baseline data is used for proximity detection, then detection simplicity is maintained, but environmental factor compensation is insufficient leading to misjudgment
Solution Approach 1:
The patent segments the detection system into two independent parts: a sensing electrode for detecting human body proximity and a reference electrode for tracking environmental factor changes. This segmentation allows each electrode to have a specific function, enabling environmental compensation without significantly increasing overall system complexity.
Solution Approach 2:
The reference electrode serves multiple functions: it tracks environmental factor changes, provides compensation data, and helps distinguish between environmental effects and actual proximity events. This multi-functionality allows the system to improve measurement precision without adding excessive complexity.
3Reliability
If environmental factor compensation is implemented, then misjudgment is reduced, but detection circuit complexity increases
Solution Approach 1:
The patent creates a copy of the sensing electrode's environmental response characteristics using the reference electrode. By copying the environmental factor effects observed in the reference electrode and applying this copy as compensation to the sensing electrode data, the system achieves reliable environmental compensation with minimal additional circuit 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
The method and circuit reduce misjudgments caused by environmental factors, enhancing the accuracy of proximity sensing by compensating for changes in capacitance due to temperature and humidity.
Implementation Method 1
Capacitive proximity sensors are currently widely used in electronic devices. The electronic device has a sensing electrode, which is equivalent to a capacitor. The equivalent capacitance of the sensing electrode will be changed under the influence of the human body and objects.
Implementation Method 2
environmental factors, such as the temperature of the electronic device, the ambient temperature, or humidity, will affect the capacitance
Data Source
AI summary
The present application provides a proximity detection circuit and a proximity detection method with compensation. The proximity detection circuit comprises a detection circuit, a baseline processing circuit and a proximity sensing circuit. The detection circuit generates a detection data and a reference data. The proximity sensing circuit generates a proximity signal according to a proximity threshold, the detection data and a baseline data generated from the baseline processing circuit, and the proximity detection circuit and the proximity detection method compensate the baseline data or the proximity threshold according to the reference data. The condition of misjudgment may be avoided under the influence of environmental factors.