Resonant Pen Detection Using Localized Frequency Scanning
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Solution Overview
Problem
Existing input devices face latency issues in detecting the presence and determining the selected resonant frequency of a resonating pen within a sensing region, as they require a full resonant frequency scan across the entire area, which is inefficient and delays the detection process.
Innovation Solution
The system employs a master controller and slave controllers to drive transmitter electrodes with specific signals, performing a resonant frequency scan only on a subset of electrodes corresponding to the location of the input object, minimizing latency by synchronizing trigger signals for demodulation and determining the selected resonant frequency based on capacitive measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a full resonant frequency scan is performed across the entire sensing region, then the resonant frequency of the input object can be determined, but the detection latency increases
Solution Approach 1:
The sensing region is divided into multiple zones, and the resonant frequency scan is performed only on the subset of electrodes corresponding to the detected input object location rather than the entire sensing region. This segmentation approach maintains detection accuracy while reducing the number of electrodes that need to be scanned, thereby decreasing detection latency.
Solution Approach 2:
Instead of performing a complete resonant frequency scan across all electrodes in the sensing region, the system performs a partial scan only on the subset of electrodes where the input object is located. This partial action is sufficient to determine the resonant frequency while significantly reducing the time required compared to a full scan.
2Adaptability or versatility
If a resonant frequency scan is performed on the entire sensing region, then all possible resonant frequencies can be detected, but the processing time increases
Solution Approach 1:
The system applies different processing strategies to different regions of the sensing region. When an input object is detected, the resonant frequency scan is applied locally only to the subset of electrodes in the vicinity of the detected object, rather than uniformly across the entire sensing region. This local quality approach maintains comprehensive detection capability while improving processing speed.
3Ease of operation
If the resonant frequency scan is performed after location detection, then the detection process can be optimized, but the overall time frame may still be insufficient for real-time applications
Solution Approach 1:
The system performs preliminary location detection using capacitive measurements to identify where the input object is located before initiating the resonant frequency scan. This preliminary action allows the subsequent resonant frequency scan to be focused on a specific subset of electrodes, optimizing the overall detection process and reducing total detection time for real-time applications.
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 significantly reduces latency in detecting the resonant frequency of a resonating pen, allowing for faster user interface changes and improved usability by performing the resonant frequency scan within the same time frame as detecting the input object's location, thereby minimizing incorrect color usage during tasks like drawing.
Implementation Method 1
first capacitive measurements determined by the slave controllers using the first trigger signal, the first capacitive measurements being based on the first transmitter signal
Implementation Method 2
A resonating pen is a passive pen that is configured to resonate at different selectable frequencies. The input device is configured to switch between various resonating frequencies in order to determine the selected resonating frequency of the resonating pen.
Data Source
AI summary
A method includes driving, by the master controller, transmitter electrodes with a first transmitter signal having a first sensing frequency while transmitting a first trigger signal to slave controllers, obtaining a location of an input object determined from first capacitive measurements determined by the slave controllers using the first trigger signal, and performing a resonant frequency scan. The performing the resonant frequency scan is by performing for each possible resonant frequency of resonant frequencies: driving, by the master controller, only a subset of the transmitter electrodes with a second transmitter signal having the possible resonant frequency while transmitting a second trigger signal to the slave controllers, wherein the subset corresponds to the location of the input object. The slave controllers demodulate a resulting signal according to the second trigger signal to obtain a second capacitive measurements for the possible resonant frequency.