Touch Panel Coordinate Calculation Algorithm Selection
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Solution Overview
Problem
Conventional touch panels face increased touch detection time with multiple simultaneous touches, necessitating a limited number of detectable touch points to maintain timely detection.
Innovation Solution
A touch panel system that includes multiple X and Y electrodes, a capacitance measuring portion, a storage unit for interelectrode capacitance values, and a control unit with algorithms for coordinate calculation, which dynamically selects calculation algorithms based on touch point priorities and required precision to ensure detection within a specified time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of touch points to be detected is increased, then the maximum number of touch points that can be detected increases, but the touch detection time increases proportionally
Solution Approach 1:
The patent segments the coordinate calculation process into multiple algorithms with different precision levels. The control portion selects appropriate algorithms based on the number of touch points detected, using simpler algorithms for larger numbers of touch points to maintain detection time constraints while still providing functional coordinate data.
Solution Approach 2:
The patent implements dynamic selection of coordinate calculation algorithms based on the detected number of touch points. The system adaptively adjusts the calculation precision and method in real-time, switching between different algorithms to optimize the balance between detection speed and coordinate accuracy according to the current touch scenario.
2Measurement precision
If high coordinate precision is maintained for all touch points, then the accuracy of touch position calculation improves, but the calculation time increases
Solution Approach 1:
The patent applies different coordinate calculation algorithms with different precision characteristics to different touch points based on their priorities. High-priority touch points (e.g., in critical interaction zones) receive higher precision calculations, while lower-priority touch points use simpler algorithms, thereby optimizing overall system performance without unnecessary computational overhead.
Solution Approach 2:
The patent changes the parameters of the coordinate calculation process by selecting from multiple algorithms with different precision and speed characteristics. The control portion dynamically adjusts which algorithm is applied based on the number of touch points and their priorities, effectively changing the computational parameters to balance accuracy and speed requirements.
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 touch detection within a specified time even with a large number of touch points, allowing for real-time user interfaces and supporting applications like multiplayer games without limiting the maximum number of touch points.
Implementation Method 1
a capacitance type touch panel that detects a change in capacitance... The input processing portion detects the change in capacitance, and calculates input coordinates (touch point) based on a signal of the capacitance change detected at each electrode
Data Source
AI summary
A touch sensing method, for sensing a touch point on a touch panel, includes the steps of measuring capacitances of the touch panel, detecting touch points on the touch panel based on the capacitance, determining tentative coordinates of the respective detected touch points, assigning priorities for a given high coordinate precision to the respective touch points based on a state of the touch points, selecting coordinate calculation algorithms corresponding to the assigned priorities by the respective touch points, estimating a calculation time necessary for calculating the coordinates of the touch points detected, determining whether the calculation time estimated is within a specified time or not, and calculating the coordinates of the respective touch points using the selected coordinate calculation algorithms corresponding to the assigned priorities when the calculation time estimated calculation time is within the specified time.