Stylus Position Calibration Using a Feedback Correction Table
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies fail to accurately correct the gap between the stylus pen coordinate and the display position of the pointer, leading to a feeling of strangeness and reduced accuracy due to varying gap sizes and directions that cannot be uniformly corrected by linear transformations.
Innovation Solution
A method that includes detecting the stylus position on an operation plane, obtaining feedback information, updating a correction table with calibration values, and deriving an output position to accurately correct the gap between the pen coordinate and display position, using a correction table that is updated based on user interaction with a predetermined pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If linear transformation is used to correct the gap between pen coordinate and display position, then the correction process is simple, but the correction accuracy is insufficient due to varying gap sizes and directions
Solution Approach 1:
The patent divides the correction process into two distinct phases: a calibration phase where a predetermined pattern is displayed and user input is collected to build a correction table, and a normal operation phase where the correction table is applied. This segmentation allows complex non-linear corrections to be pre-computed and stored, making real-time correction simple while maintaining high accuracy.
Solution Approach 2:
The patent performs preliminary calibration by displaying a predetermined pattern and collecting user touch input data before normal operation. The correction table is pre-computed based on the differences between displayed pattern coordinates and actual user input coordinates, storing correction values for multiple positions. This preliminary action enables accurate correction during normal use without requiring complex real-time calculations.
2Measurement precision
If a correction table with multiple position calibration values is used, then position correction accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent creates a correction table that copies and stores the relationship between displayed pattern coordinates and actual user input coordinates. Instead of implementing complex real-time calculation algorithms, the system copies the correction data into a lookup table during calibration, enabling simple table-based correction during normal operation while maintaining high accuracy.
3Adaptability or versatility
If the correction table is updated based on user interaction with a predetermined pattern, then the correction adapts to individual user characteristics, but the calibration process requires additional user time
Solution Approach 1:
The patent implements a feedback mechanism where the system displays a predetermined pattern, detects user touch input on the pattern, and uses this feedback to update the correction table. The correction values are calculated based on the differences between displayed coordinates and actual user input coordinates, allowing the system to adapt to individual user characteristics such as holding position and writing style.
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
Accurately corrects the gap between the pen coordinate and display position, enhancing user experience by reducing the perceived discrepancy and improving positional accuracy.
Implementation Method 1
a stylus called 'active stylus' includes a power source part and a signal processing circuit, and is configured to be able to transmit a pen signal toward a sensor controller in the electronic device by supplying an electric charge in accordance with a signal produced by the signal processing circuit to an electrode (a pen electrode)
Implementation Method 2
When the active stylus supplies a charge to the pen electrode to transmit a pen signal, an electric field is generated in a space in the vicinity of the pointed position of the active stylus, and a charge is thereby induced in the electrode group that constitutes the touch sensor. The sensor controller detects for each of the electrodes a variation of the charge induced in this manner
Implementation Method 3
The sensor controller detects a variation of the capacitance generated by contact of a finger with the electrode group and thereby also detects the position of the finger touch
Data Source
AI summary
Disclosed herein is a method executed by a device that is configured to be able to detect a pointed position of a stylus on an operation plane being superimposed on a displaying part. The method includes receiving feedback information relating to a display position of a predetermined pattern on the displaying part from a host processor, updating at least some of plural position calibration values stored in a correction table that stores therein the position calibration value for each of plural positions arranged on the operation plane, on a basis of the received feedback information, detecting a tentative pointed position of the stylus, reading the position calibration value that corresponds to the tentative pointed position from the correction table and deriving an output position by correcting the tentative pointed position on a basis of the position calibration value, and reporting the output position to the host processor.