Touch Detection Circuit With Spectrum Extraction for Lower Bandwidth
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Solution Overview
Problem
Touch devices face high power consumption and significant bandwidth requirements due to the large amount of voltage data generated during frequent scanning of touch electrodes, necessitating improved data transmission and processing efficiency.
Innovation Solution
A touch detection circuit with an analog-side chip and digital-side chip configuration, utilizing splitters, analog-to-digital conversion circuits, spectrum extraction circuits, and shifters to reduce data transmission bandwidth and power consumption by processing and extracting only essential frequency components of touch signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high scanning frequency is used to detect touch electrodes, then touch detection accuracy is improved, but data transmission bandwidth requirement increases and power consumption increases
Solution Approach 1:
The patent extracts and transmits only the differential voltage data (touch electrode voltage minus reference electrode voltage) rather than the complete voltage data from all electrodes. This extraction of essential information reduces the data volume transmitted over the bus, thereby reducing processor power consumption while maintaining touch detection accuracy.
Solution Approach 2:
The patent segments the voltage detection process into two parts: the common-mode voltage (reference electrode) and the differential voltage (touch electrode minus reference). By processing and transmitting only the differential component, the system reduces bandwidth requirements and power consumption while preserving the essential touch detection information.
2Measurement precision
If high scanning frequency is used to detect touch electrodes, then touch detection accuracy is improved, but data transmission bandwidth requirement increases
Solution Approach 1:
The patent extracts only the necessary differential voltage information from the complete electrode voltage data. By transmitting only this extracted differential component rather than all raw voltage data, the system significantly reduces the data transmission bandwidth requirement while maintaining full touch detection capability.
Solution Approach 2:
The patent segments the voltage signal into common-mode and differential components, transmitting only the differential segment that contains the actual touch information. This segmentation approach reduces the quantity of data that must be transmitted over the bus.
3Loss of information
If complete voltage data from all electrodes is transmitted, then data completeness is improved, but processing complexity and power consumption increase
Solution Approach 1:
The patent extracts and transmits only the differential voltage data that contains the essential touch information, eliminating the need to process and transmit redundant common-mode voltage data. This extraction maintains data completeness for touch detection purposes while reducing processing complexity.
Data Source
AI summary
A touch detection circuit is provided, including an analog-to-digital conversion circuit configured to receive an analog touch signal output by touch electrodes and convert the analog touch signal into a digital touch signal; a spectrum extraction circuit electrically connected to the analog-to-digital conversion circuit and configured to obtain a component signal corresponding to at least one preset frequency of the digital touch signal within a preset time interval; an amplitude and phase extraction circuit electrically connected to the spectrum extraction circuit and configured to obtain an amplitude of the component signal, the touch detection circuit determines a touch position of the touch electrodes according to the amplitude of the component signal. A touch device is further provided. Thereby, the touch detection circuit and touch device provided by the present application can reduce the bus bandwidth required for data transmission and lower the power consumption of the processor.