Touch Sensor Calibration via Mask Region Segmentation
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Solution Overview
Problem
In touch panel systems, calibration is often not performed in the non-indicated state, leading to potential long-term avoidance of calibration and erroneous detection of touch positions, especially when a person is proximate for an extended period.
Innovation Solution
A touch sensor control device that specifies a touch position, sets a mask region around it, and performs calibration on the detection surface except for the mask region, using past calibration data to adjust sensitivity and remove the influence of the indicator's presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed using traditional methods that require complete non-indicated state, then calibration accuracy is improved, but calibration cannot be performed when indicator is present causing extended calibration avoidance periods
Solution Approach 1:
The detection surface is divided into a mask region (where indicator contact is detected) and a non-mask region (where calibration is performed). This segmentation allows calibration to proceed in areas not affected by indicator presence while avoiding contamination from the indicated area, thus maintaining calibration accuracy while enabling calibration during indicator presence.
Solution Approach 2:
Different regions of the detection surface are assigned different functions: the mask region is optimized for indicator detection while the non-mask region is optimized for calibration. This local differentiation allows each region to perform its specific function optimally without interfering with the other, enabling simultaneous indicator presence and calibration.
2Reliability
If calibration is performed in non-indicated state to ensure accuracy, then detection sensitivity uniformity is improved, but calibration may be delayed indefinitely when indicator is continuously present
Solution Approach 1:
By segmenting the detection surface into mask and non-mask regions, the system can perform calibration in the non-mask region even when an indicator is present in the mask region. This ensures calibration is executed frequently (improving productivity) while still using data from a region unaffected by indicator presence (maintaining reliability and sensitivity uniformity).
Solution Approach 2:
The system performs calibration using data from the non-mask region, which serves as a self-contained calibration source that does not require external intervention or waiting for indicator absence. This self-service capability ensures calibration can be performed autonomously and frequently without compromising detection sensitivity uniformity.
3Measurement precision
If mask region is excluded from calibration to avoid indicator influence, then calibration accuracy in non-mask region is improved, but overall detection sensitivity may become non-uniform across the entire surface
Solution Approach 1:
The mask region is extracted and excluded from calibration processing, allowing calibration to be performed solely on the non-mask region where indicator influence is absent. This ensures high calibration accuracy in the calibrated areas while the mask region maintains its indicator detection function, achieving both local calibration precision and overall system functionality.
Solution Approach 2:
The system dynamically adjusts calibration application by applying calibration data selectively to the non-mask region while excluding the mask region. This dynamic approach allows the system to adapt to indicator presence while maintaining detection sensitivity uniformity across the entire surface through region-specific calibration application.
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 appropriate calibration at desired times, ensuring uniform detection sensitivity and accurate touch position specification, even when an indicator is present, without requiring additional sensors.
Implementation Method 1
capacitive touch panel of a projection type
Implementation Method 2
distribution of electrostatic capacitance of the touch panel changes
Data Source
AI summary
A touch sensor control device which performs appropriate calibration is realized. A touch sensor control device (3) of one aspect of the invention controls a touch sensor (5) and includes a touch position detection unit (14) which specifies a touch position on a detection surface of the touch sensor; a mask generation unit (15) which sets a mask region according to the touch position; and a calibration value generation unit (16) which performs, for a region except the mask region, calibration of detection sensitivity of a touch.