Electromagnetic Inductive Touch Panel Dual Frequency Resonant Circuits
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Solution Overview
Problem
Existing electromagnetic inductive touch panels face inefficiencies in detecting the touch position of an electromagnetic stylus, particularly when a hand or finger is placed on the panel, as they struggle to distinguish between hand or finger touch and stylus touch, leading to difficulties in accurate coordinate input.
Innovation Solution
The implementation of an electromagnetic inductive touch panel using two resonant circuits that emit and receive electromagnetic signals at different frequencies, allowing for concurrent detection in both the X and Y directions, enhancing the efficiency of touch position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single frequency electromagnetic signal is used for touch detection, then the device complexity is reduced, but the detection accuracy and ability to distinguish between hand/finger touch and stylus touch deteriorates
Solution Approach 1:
The patent divides the touch detection system into two independent resonant circuits operating at different frequencies (first resonant circuit at first frequency, second resonant circuit at second frequency). Each resonant circuit independently detects touch positions in different directions, allowing the system to distinguish between hand/finger touch and stylus touch by analyzing the frequency-specific signal patterns, thereby improving measurement precision without creating a monolithic complex system
Solution Approach 2:
The patent changes the frequency parameter of the electromagnetic signals to resolve the detection ambiguity. By using different frequencies for different detection directions (first frequency for X-direction, second frequency for Y-direction), the system creates distinct signal signatures that enable accurate differentiation between touch types, transforming a single-parameter detection problem into a multi-parameter solution space
2Productivity
If sequential detection in X and Y directions is performed, then the device complexity is reduced, but the detection time increases
Solution Approach 1:
The patent employs periodic electromagnetic signals at different frequencies simultaneously in both X and Y direction detections. The first resonant circuit periodically emits signals at the first frequency while the second resonant circuit periodically emits signals at the second frequency, creating overlapping periodic waveforms that can be processed concurrently to determine touch positions in both directions without sequential delays
Solution Approach 2:
The patent adds the frequency dimension to the detection system, using different frequencies as an additional degree of freedom to enable concurrent X and Y direction detections. This dimensional expansion allows multiple detection operations to proceed simultaneously in the frequency domain, transforming a time-sequential detection process into a spatial-concurrent process
3Measurement precision
If function fitting is performed on all inductive signals to determine touch position, then the measurement precision is improved, but the processing time increases
Solution Approach 1:
The patent segments the inductive signals into frequency-specific groups (first inductive signals at first frequency, second inductive signals at second frequency) corresponding to different detection directions. This segmentation allows the function fitting process to be applied independently to each frequency group, enabling parallel processing and reducing overall computation time while maintaining the precision benefits of fitting analysis
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 approach improves the accuracy and speed of detecting the touch position of an electromagnetic stylus by using distinct frequencies for drive signals in both directions, effectively addressing the inefficiencies in existing technologies.
Implementation Method 1
at least one of the first coils emits a first electromagnetic signal at a first frequency
Implementation Method 2
the first resonant circuit receives the first electromagnetic signal and then resonates to generate a first reflected signal at the first frequency
Implementation Method 3
at least one of the second coils emits a second electromagnetic signal at a second frequency
Implementation Method 4
the second resonant circuit receives the second electromagnetic signal and then resonates to generate a second reflected signal at the second frequency
Data Source
AI summary
Embodiments of the invention provide an electromagnetic inductive touch panel for detecting a touch position of an electromagnetic stylus including a first resonant circuit and a second resonant circuit, the electromagnetic inductive touch panel including: a plurality of first coils extending in a first direction, wherein at least one of the first coils emits a first electromagnetic signal at a first frequency, and the first resonant circuit receives the first electromagnetic signal and then resonates to generate a first reflected signal at the first frequency; and a plurality of second coils extending in a second direction, wherein at least one of the second coils emits a second electromagnetic signal at a second frequency, and the second resonant circuit receives the second electromagnetic signal and then resonates to generate a second reflected signal at the second frequency.