Differential Capacitive Sensing for Temperature-Compensated Detection
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Solution Overview
Problem
Capacitive sensors used in human-computer interaction are affected by temperature, leading to inaccurate detection results.
Innovation Solution
A capacitance detection apparatus with a sensing module comprising two sensing layers and a differential detection circuit, where one sensing layer is positioned to detect changes influenced by both the detection object and temperature, while the other is only influenced by temperature, allowing for the elimination of temperature effects and improved detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If capacitive sensors are used for human-computer interaction detection, then the installation is easy and cost is low, but the detection results are inaccurate due to temperature effects
Solution Approach 1:
The sensing module is divided into two separate sensing units: a first sensing unit that detects both temperature effects and object proximity, and a second sensing unit that detects only temperature effects. By segmenting the sensing function into these two independent units, the patent enables separate measurement of temperature interference and actual detection signals, allowing for compensation and improved accuracy while maintaining the simplicity of capacitive sensing
Solution Approach 2:
The second sensing unit acts as an intermediary that measures the temperature effect separately. This intermediary measurement allows the system to calculate and compensate for temperature-induced errors in the first sensing unit's readings, thereby improving detection accuracy without changing the fundamental capacitive sensing mechanism
2Adaptability or versatility
If temperature effects are included in the detection, then the sensing module can detect environmental changes, but the detection accuracy of object proximity is reduced
Solution Approach 1:
The patent segments the detection function into two parallel sensing units with different detection targets. The first sensing unit detects both temperature and object proximity, while the second sensing unit detects only temperature. This segmentation allows the system to maintain environmental adaptability through the first unit while achieving accurate object proximity detection by compensating using data from the second unit
Solution Approach 2:
The system uses feedback from the second sensing unit's temperature measurements to compensate for temperature effects in the first sensing unit's readings. By continuously monitoring temperature effects and applying compensation calculations, the system maintains high detection accuracy for object proximity while remaining adaptable to environmental temperature changes
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 eliminates temperature-induced errors, enhancing the accuracy of capacitance detection by isolating the influence of temperature from the changes caused by the detection object.
Implementation Method 1
differential detection circuit for detecting changes in capacitance of the sensing module
Data Source
AI summary
A capacitance detection apparatus and an electronic device are disclosed. The capacitance detection apparatus includes: a sensing module, a connecting circuit, and a differential detection circuit for detecting changes in capacitance of the sensing module; the sensing module comprises: a substrate, and a first sensing layer and a second sensing layer respectively located on two sides of the substrate; a first sensing unit of the first sensing layer is opposite to a second sensing unit of the second sensing layer, and the first sensing unit covers the second sensing unit; the first sensing unit and the second sensing unit are electrically connected to the differential detection circuit. When a detection object approaches the capacitance detection apparatus, the capacitance of the first sensing unit is influenced by the temperature and the detection object, and the capacitance of the second sensing unit is only influenced by the temperature.