Stylus Position Calibration for Pen-to-Display Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods fail to accurately correct the gap between the pen coordinate and the display position of a pointer, which can vary in size and direction, leading to user discomfort due to positional discrepancies.
Innovation Solution
A method that involves detecting the stylus position on an operation plane, updating position calibration values in a correction table based on feedback information, and deriving an output position using these values to correct the gap between the pen coordinate and display position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing correction methods are used, then the correction process is simple, but the correction accuracy is insufficient due to gap variations in size and direction
Solution Approach 1:
The correction process is segmented into multiple stages: initial correction using reference points, followed by iterative correction using detected pointer positions and feedback information. Each stage addresses specific aspects of the gap correction, allowing complex variations in gap size and direction to be handled systematically without overwhelming complexity.
Solution Approach 2:
Reference points are displayed on the screen before the actual handwriting input begins. The user traces these reference points first, allowing the system to pre-calculate correction values based on the known positions. This preliminary action establishes a baseline correction that improves subsequent correction accuracy.
Solution Approach 3:
The system displays feedback information showing the detected pointer position and compares it with the actual pen coordinate. This feedback loop allows the system to iteratively refine correction values, adjusting for variations in gap size and direction that occur during different writing conditions and stylus orientations.
2Ease of operation
If the gap correction is not performed, then the system operation is simple and fast, but the user experience deteriorates due to positional discrepancies between pen input and display output
Solution Approach 1:
The system automatically performs correction calculations and adjustments without requiring manual intervention beyond the initial reference point tracing. The correction algorithm self-adjusts based on detected pointer positions and feedback information, making the complex correction process transparent to the user while maintaining simple operation.
3Measurement precision
If multiple correction parameters are used to handle gap variations, then the correction accuracy improves, but the calculation complexity increases
Solution Approach 1:
The correction parameters are not fixed but dynamically adjusted based on detected pointer positions and feedback information. The system adapts correction values in real-time during the tracing process, allowing accurate handling of gap variations without requiring pre-computation of all possible correction scenarios, thus balancing accuracy with calculation efficiency.
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 aligning the pen input with the displayed output.
Implementation Method 1
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
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
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.