Flexible Touch Sensor Layout With Virtual Electrodes for Noise Subtraction
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Solution Overview
Problem
Existing electronic devices face challenges in improving sensing reliability due to noise interference from noise signals, which affect the accuracy of touch-based input detection.
Innovation Solution
The electronic device incorporates a sensor layer with sensing electrodes and virtual electrodes connected through RC circuits on a flexible circuit board, where the RC circuits control noise signal magnitude and the sensor driving part subtracts noise signals from touch signals, enhancing sensing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If virtual electrodes are added to sense noise signals, then sensing reliability is improved, but device complexity increases due to additional RC circuits and signal processing requirements
Solution Approach 1:
The sensor layer is segmented into functional groups: sensing electrodes for touch detection, virtual electrodes for noise sensing, RC circuits for signal conditioning, and the sensor driving part for coordinated control. This segmentation allows independent optimization of each component while maintaining overall system reliability.
Solution Approach 2:
RC circuits serve as intermediary components between the virtual electrodes and the sensor driving part. These circuits condition the noise signals by controlling their magnitude through resistive and capacitive elements, enabling effective noise cancellation without directly coupling the virtual electrodes to the processing circuitry.
2Measurement precision
If noise signals are subtracted from touch signals, then measurement precision is improved, but signal processing complexity increases
Solution Approach 1:
The system performs preliminary noise sensing and signal conditioning through RC circuits before the main subtraction operation. Virtual electrodes continuously monitor noise signals, and RC circuits pre-process these signals by controlling their magnitude, so that when subtraction occurs in the sensor driving part, the operation is simplified and more effective.
Solution Approach 2:
The sensor driving part receives both touch signals from sensing electrodes and noise signals from virtual electrodes, processes them through subtraction, and outputs corrected touch signals. This feedback mechanism continuously compensates for noise interference, improving measurement precision while maintaining manageable processing complexity through systematic signal flow.
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 configuration significantly improves sensing reliability by effectively reducing noise interference, thereby enhancing the accuracy of touch-based input detection.
Implementation Method 1
a first RC circuit electrically connected between the sensor driving part and the first virtual sensor part
Implementation Method 2
a first RC circuit electrically connected between the sensor driving part and the first virtual sensor part
Data Source
AI summary
Provided is an electronic device. The electronic device includes a display layer, a sensor layer disposed on the display layer and including a plurality of sensing electrodes, a sensor driving part, a first virtual sensor part including a plurality of virtual electrodes, a first RC circuit electrically connected between the sensor driving part and the first virtual sensor part, and a flexible circuit board which is connected to the display layer and on which the sensor driving part and the first RC circuit are disposed. The sensor driving part may be configured to receive a touch signal from the plurality of sensing electrodes and receive a first noise signal from the plurality of virtual electrodes, the first RC circuit may be configured to control a magnitude of the first noise signal, and the sensor driving part may be configured to subtract the touch signal and the first noise signal.