Capacitive Sensing Device Using Orthogonal Matrix Decoding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Capacitive sensing devices face signal saturation issues during signal processing, which complicates the calculation of touch input data in consumer electronic devices.
Innovation Solution
The capacitive sensing device employs a driving circuit that transmits driving signals corresponding to non-orthogonal or orthogonal matrices to sensing electrodes, with an operational circuit decoding these signals using the inverse matrices to prevent signal saturation and simplify calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional signal processing methods are used in capacitive sensing devices, then the device can process touch input data, but signal saturation occurs during signal processing which complicates calculation
Solution Approach 1:
The patent applies parameter changes by transforming the sensing matrix from a conventional form to an orthogonal matrix structure. This mathematical parameter transformation enables the use of orthogonal properties (where the matrix multiplied by its transpose equals the identity matrix) to simplify the inversion operation, thereby preventing signal saturation and reducing calculation complexity while maintaining reliable signal processing
2Productivity
If conventional matrix operations are used for decoding sensing signals, then the sensing device can generate touch input data, but the calculation functions become complex and require significant computational resources
Solution Approach 1:
The patent transforms the decoding operation by changing the matrix parameter structure to orthogonal. This allows the inverse matrix operation to be replaced with a simple transpose operation, dramatically reducing computational complexity from O(n³) matrix inversion to O(n²) matrix transposition, thereby improving processing efficiency while simplifying the calculation functions
Solution Approach 2:
The patent substitutes complex mathematical operations with simpler equivalent operations. Specifically, it replaces the mechanical process of matrix inversion with the simpler matrix transpose operation, leveraging the orthogonal property where the inverse of an orthogonal matrix is equal to its transpose. This substitution reduces computational burden while maintaining the same functional outcome
Data Source
AI summary
The present application discloses a capacitive sensing device and a sensing method thereof. A plurality of driving signals corresponding to a plurality of driving codes are outputted to a plurality of driving electrodes, thereby, a plurality of sensing signal are generated on a plurality of sensing electrodes corresponding to the driving electrodes, where the sensing signals are decoded to sensing data by an operation circuit. Hereby, the calculation function of the operation circuit according to the present application may be simplified.