Capacitive Pen State Detection with Adaptive Input-Output Models
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Solution Overview
Problem
Existing pen state detection systems face accuracy issues due to changes in the outer shape of electronic pens or equipment, affecting the geometric relation between pen-side and sensor electrodes, which alters signal distribution patterns.
Innovation Solution
A pen state detection circuit and method that adjusts the input-output model based on changes in the outer shape of the electronic pen or equipment, using a parameter supply device to set model parameters that account for variations in pen type, equipment type, touch sensor type, and user interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single input-output model is used for pen state detection, then the device complexity is reduced, but the measurement precision deteriorates due to changes in outer shape and combination variations
Solution Approach 1:
The patent divides the detection system into multiple input-output models, each corresponding to different outer shape conditions of the electronic pen or equipment. Instead of using one universal model, the system segments the detection task into multiple specialized models that can be selected based on the current condition, thereby maintaining high detection accuracy across various scenarios.
Solution Approach 2:
The system dynamically selects and switches between different input-output models based on detected changes in outer shape or combination conditions. This dynamic adaptation allows the system to maintain optimal detection accuracy by using the most appropriate model for the current state, rather than relying on a static single model.
2Measurement precision
If multiple input-output models are prepared for different conditions, then the measurement precision is maintained, but the device complexity increases due to model selection and management
Solution Approach 1:
The system incorporates a feedback mechanism that continuously monitors the outer shape conditions and combination states of the electronic pen and equipment. Based on this feedback information, the system automatically selects the appropriate input-output model, eliminating the need for complex manual model management and making the switching process transparent to the user.
Solution Approach 2:
The system performs self-service by automatically detecting changes in outer shape or combination conditions and autonomously selecting the corresponding input-output model without requiring user intervention. This self-service capability simplifies the overall system complexity while maintaining high detection accuracy through appropriate model selection.
3Ease of operation
If the input-output model is fixed, then the ease of operation is improved, but the adaptability deteriorates when outer shape or combination changes occur
Solution Approach 1:
The system prepares multiple input-output models in advance, each optimized for specific outer shape conditions or combination scenarios. By having these models pre-configured and ready, the system can quickly adapt to changes without requiring complex real-time adjustments or user reconfiguration, thus maintaining ease of operation while improving adaptability.
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
Maintains high accuracy in pen state detection by adapting the input-output model to changing conditions, ensuring precise position and orientation estimation of the electronic pen.
Implementation Method 1
a touch sensor of a capacitive system made of planarly disposed multiple sensor electrodes... acquiring, from the touch sensor, signal distribution indicating a change in capacitance associated with approach of a pen-side electrode
Data Source
AI summary
A pen state detection circuit is incorporated in electronic equipment having a touch sensor of a capacitive system made of planarly disposed multiple sensor electrodes. The pen state detection circuit is configured to perform acquiring, from the touch sensor, signal distribution indicating a change in capacitance associated with approach of a pen-side electrode included in an electronic pen, and estimating a state of the electronic pen according to an input-output model. In the input-output model features relating to the acquired signal distribution are input and a state quantity of the electronic pen is output. The pen state detection circuit is configured to be capable of setting an input-output model that is different depending on a change in an outer shape of the electronic pen or the electronic equipment.