Multi-Indicator Position Detection via Adaptive Resonant Scanning
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Solution Overview
Problem
Existing position detection methods fail to simultaneously detect the positions indicated by multiple position indicators, such as a pen and an eraser, due to interference and the need for separate resonant frequencies, preventing the detection of one indicator when the other is in use.
Innovation Solution
A position detection apparatus and method that includes a sensor and controller, which alternates detection processes between multiple position indicators, allowing continuous detection by prioritizing one indicator while halting detection of another, and then resuming detection of both indicators based on their resonant frequencies and positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If different resonant frequencies are allocated to position indicators and global scans are performed in time-division manner, then position indicators can be distinguished and detected, but the position indicated by another position indicator cannot be detected after one position indicator is detected
Solution Approach 1:
The patent applies dynamics by making the detection process adaptive and changeable. The controller dynamically switches between global scan mode and local scan mode based on detection needs. When no position indicator is detected, global scan mode is used to search the entire sensor area. When a position indicator is detected, the system transitions to local scan mode to continuously track that specific indicator. This dynamic adjustment of detection scope and mode enables the system to handle multiple position indicators effectively, resolving the contradiction between detection precision and multi-indicator capability.
Solution Approach 2:
The patent implements periodic action through alternating between global scans and local scans. The system periodically performs global scans to detect the presence of position indicators, and when indicators are detected, it periodically performs local scans to track their positions. This periodic alternation between different detection scopes ensures that multiple position indicators can be detected and tracked over time, even when using time-division multiplexing with different resonant frequencies.
2Reliability
If continuous detection of one position indicator is performed, then accurate position tracking is achieved, but detection of other position indicators is halted
Solution Approach 1:
The patent applies segmentation by dividing the detection process into distinct phases: global scan phase and local scan phase. The global scan phase segments the entire sensor area into detectable zones to identify position indicators. The local scan phase segments the detection focus to specific detected indicators for continuous tracking. This segmentation of detection scope and timing allows the system to maintain reliable tracking of detected indicators while periodically checking for other indicators, thus handling multiple indicators without compromising tracking stability.
3Quantity of substance
If multiple position indicators are detected simultaneously using separate resonant frequencies, then all indicators can be tracked, but detection interference and complexity increase
Solution Approach 1:
The patent applies merging by combining global scan and local scan operations into a unified detection framework. The controller integrates both detection modes, switching between them based on the detection state. This merging of detection approaches allows the system to handle multiple position indicators efficiently without requiring completely separate detection systems for each indicator, thereby reducing overall system complexity while maintaining the ability to track multiple indicators simultaneously.
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
Enables simultaneous and accurate detection of positions indicated by multiple position indicators, such as a pen and an eraser, by optimizing detection processes to accommodate user interactions and prevent interference.
Implementation Method 1
The position detection apparatus first causes one of the loop coils to generate a magnetic field. Consequently, induced power is generated in the inductor of the position indicator
Implementation Method 2
Different resonant frequencies are allocated to the position indicators, and the resonant frequencies are first used to perform global scans
Data Source
AI summary
A position detection apparatus includes a sensor, and a controller that detects a position of a first position indicator and a position of a second position indicator through the sensor. The controller continues detecting the position of the first position indicator and halts detecting the position of the second position indicator after a state in which the positions of the first position indicator and the second position indicator are not detected changes to a state in which the position of the first position indicator is detected, and continues both detecting the position of the second position indicator and detecting the position of the first position indicator after the state in which the positions of the first position indicator and the second position indicator are not detected changes to a state in which the position of the second position indicator is detected.