Touch Panel Controller Dynamic Bend Correction
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Solution Overview
Problem
Existing touch sensor systems face challenges in accurately detecting input positions on touch panels due to external factors like panel bending, which can cause capacitance changes that are similar in magnitude to those from user inputs, leading to degraded detection accuracy.
Innovation Solution
A touch panel controller that generates a second signal value map by performing correction calculations on a broader area than the input operation range, canceling out changes caused by external factors such as panel bending, using an area configuration unit, average value calculation unit, inclination calculation unit, and correction calculation unit to generate a corrected capacitance map.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed to correct static bend influence, then detection accuracy is improved under static conditions, but detection accuracy degrades when dynamic bend occurs
Solution Approach 1:
The patent transitions from static calibration to dynamic correction by continuously monitoring capacitance changes and adapting correction values in real-time. The system detects temporal changes in capacitance distribution and adjusts correction algorithms dynamically to account for changing bend conditions, thereby maintaining detection accuracy under both static and dynamic bend scenarios.
Solution Approach 2:
The patent changes the parameter being corrected from fixed calibration values to dynamic correction values that adapt to changing bend conditions. By monitoring temporal changes in capacitance distribution and adjusting correction parameters accordingly, the system maintains accuracy under varying dynamic conditions while preserving the benefits of calibration for static conditions.
2Productivity
If correction calculation is performed on a small area, then processing speed is improved, but correction accuracy degrades for broader external factor influences
Solution Approach 1:
The patent divides the touch panel area into multiple regions and performs correction calculations for each region independently. This segmentation allows the system to process smaller areas in parallel, improving processing speed while ensuring that local variations in capacitance distribution are accurately corrected. The segmented approach maintains computational efficiency while achieving comprehensive correction coverage.
3Measurement precision
If the area for correction calculation is expanded to broader range, then correction accuracy for external factors is improved, but processing complexity increases
Solution Approach 1:
The patent applies correction calculations to areas broader than the immediate input region, using excessive action to ensure all external factor influences are captured. By extending the correction area beyond the minimal necessary region, the system ensures comprehensive correction of external factors like bend and electromagnetic waves, while managing complexity through efficient algorithms that handle the expanded scope.
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
Effectively removes the influence of external factors, enabling accurate detection of input positions even when the touch panel is dynamically bending, by maintaining signal values at input positions while reducing them in non-input areas.
Implementation Method 1
In a capacitance type touch sensor system, a change in capacitance (signal value) in the touch panel, which is caused by the contact of the finger of the user or the touch stylus with the touch panel, is detected.
Implementation Method 2
a second signal value map generation unit that configures an area that is a broader range than a range where changes in the signal values due to an input operation on the touch panel occur on the first signal value map and generates a second signal value map by performing correction calculation which cancels changes in the signal values due to external factors different from the input operation on the touch panel in the area
Data Source
AI summary
A touch panel controller (1) includes a first capacitance distribution calculation unit (15) that outputs a first signal value map which indicates a distribution of signal values in a touch panel (10) and a first capacitance distribution correction unit (16) that configures a broader area than an area in which changes in the signal values due to an input operation on the touch panel occur on the first signal value map, performs correction calculation that cancels the changes in the signal values due to external factors which are different from the input operation on the touch panel in the region, and generates a second signal value map.