Pen Pressure Threshold Calibration via Proximity Detection
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Solution Overview
Problem
Existing pen pressure detection systems suffer from ink leakage phenomena due to hysteresis in pen pressure detection sensors, incomplete calibration before subsequent pen-down events, and excessive battery consumption from repeated calibration during pen-up states.
Innovation Solution
A method that updates the pen pressure determination threshold based on proximity values and pen pressure levels, allowing for immediate threshold adjustment during pen-down events and reducing reliance on hysteresis, enabling accurate event generation and efficient calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pen pressure determination threshold is calibrated using statistical processing of pen pressure levels during pen-up state, then variations in pen pressure detection are reduced, but the calibration may not be completed before the next pen-down event when users operate quickly
Solution Approach 1:
The system performs preliminary calibration actions by accumulating pen pressure level data during pen-up states and computing statistical values (mean and standard deviation) in advance. This preliminary processing ensures that when a pen-down event occurs, the calibration is already complete or near-complete, reducing the time loss for quick user operations.
Solution Approach 2:
The calibration process is made dynamic by continuously updating statistical parameters (mean and standard deviation) as new pen pressure data becomes available during pen-up states. This dynamic approach allows the system to adapt to changing conditions and complete calibration progressively rather than requiring a fixed, lengthy calibration period.
2Reliability
If the pen pressure determination threshold is not updated timely, then the drawing application continues to draw after pen-up due to hysteresis, causing ink leakage phenomenon
Solution Approach 1:
The system implements feedback by continuously monitoring pen pressure levels and comparing them against the determined threshold. When the pen pressure level falls below the threshold after being above it, the system generates a pen-up event and updates the threshold accordingly. This feedback mechanism ensures timely detection of pen-up events and prevents ink leakage by stopping the drawing application appropriately.
Solution Approach 2:
The system performs preliminary threshold determination by calculating the mean and standard deviation of pen pressure levels during pen-up states before a pen-down event occurs. This preliminary threshold is then used for immediate comparison when pen pressure changes, enabling rapid and accurate event detection without waiting for extended calibration periods.
3Measurement precision
If statistical processing is performed to calibrate the pen pressure determination threshold, then variations between pens and temporal variations are reduced, but the calibration process requires acquiring sufficient samples which may not be available before next pen-down
Solution Approach 1:
The calibration process is made dynamic and incremental rather than static and batch-oriented. The system continuously accumulates pen pressure level samples during pen-up states and updates statistical parameters (mean and standard deviation) as data becomes available. This dynamic approach allows calibration to progress continuously without requiring a fixed number of samples to be collected before use, thereby improving calibration speed while maintaining precision.
Solution Approach 2:
The system performs preliminary statistical processing by accumulating samples and computing mean and standard deviation values during available pen-up states. This preliminary calibration work is done in advance whenever possible, so that when a pen-down event occurs, the threshold is already determined or nearly determined, reducing the need for extensive sampling during active use and improving overall calibration speed.
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 minimizes ink leakage, ensures timely calibration, and conserves battery life by updating the threshold only when necessary, improving user experience and device efficiency.
Implementation Method 1
acquiring a proximity value indicating a positional relationship between the pen and the pen detection apparatus from a proximity detector provided on one of the pen and the pen detection apparatus
Data Source
AI summary
A method performed by a pen or a pen detection apparatus that detects the pen, the method includes: acquiring a pen pressure level according to a force applied to a pen nib of the pen; generating a pen-down event or a pen-up event based on a result of comparing the pen pressure level and a pen pressure determination threshold; acquiring a proximity value indicating a positional relationship between the pen and the pen detection apparatus from a proximity detector provided on one of the pen and the pen detection apparatus; and updating the pen pressure determination threshold based on the pen pressure level when the proximity value indicates that the positional relationship between the pen and the pen detection apparatus satisfies a predetermined relationship.