Selective Coupling Circuitry for Touch Detection
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Solution Overview
Problem
Self-capacitance touch detection systems face reduced detection sensitivity due to increased capacitive coupling between electrodes when drive signals of different phases are supplied, leading to lower detection performance.
Innovation Solution
A detection device and method that utilize a selective coupling circuitry to integrate detection signals from selected electrodes, reducing capacitive coupling by using distinct selection signals for different electrode groups, thereby enhancing detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If drive signals of different phases are supplied to a plurality of detection electrodes in self-capacitance scheme, then detection coverage is improved, but capacitive coupling between electrodes increases and detection sensitivity is lowered
Solution Approach 1:
The detection electrode group is divided into multiple sub-groups, with each sub-group containing a specific number of detection electrodes. By segmenting the electrodes and applying different selection signals to different sub-groups, the system can reduce capacitive coupling between simultaneously active electrodes while maintaining comprehensive detection coverage across all electrodes.
2Productivity
If multiple detection electrodes are simultaneously selected for detection, then detection speed is improved, but capacitive coupling increases and causes detection errors
Solution Approach 1:
The system employs periodic selection of detection electrode sub-groups using different selection signals. By periodically switching between different sub-groups and integrating detection signals over multiple periods, the system achieves both fast detection speed and high accuracy while minimizing capacitive coupling effects through the periodic modulation pattern.
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 solution effectively suppresses capacitive coupling between electrodes, improving detection sensitivity and accuracy in touch or proximity detection.
Implementation Method 1
a detection electrode group that includes a plurality of first electrodes each of which is configured to display a signal that changes according to touch or approach of an external object
Data Source
AI summary
Provided is a detection device which includes a detection electrode group including a plurality of first electrodes each of which is configured to detect a detection signal that changes according to touch or approach of an external object, an output signal line, and a selective coupling circuitry configured to couple first electrodes of a first detection target in the detection electrode group with the output signal line according to a first selection signal, output a first output signal obtained by integrating detection signals output from the selected first electrodes of the first detection target to the output signal line, couple first electrodes of a second detection target which are not included in the first detection target in the detection electrode group with the output signal line according to a second selection signal different from the first selection signal, and output a second output signal.