Touch Panel Position Detection Using Orthogonal Potential Correction
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Solution Overview
Problem
Existing touch panels struggle to accurately detect the position coordinates of two contact points simultaneously, and methods involving divided resistance films or multiple sets of resistance films increase manufacturing costs.
Innovation Solution
A position detection method using a conventional 4-wire type touch panel with a first resistance film and a second resistance film, where the distance between contact points is calculated by measuring potentials at specific electrode configurations, and corrected using orthogonal direction measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a divided resistance film configuration or multiple sets of resistance films are used to detect two contact points, then position detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the detection process into two distinct measurement phases: first measuring potential distribution in the X-direction, then measuring potential distribution in the Y-direction. This temporal segmentation allows a single resistance film to function effectively for two-point detection without requiring physically divided or multiple resistance films, thereby maintaining manufacturing simplicity while achieving accurate position detection
Solution Approach 2:
The patent transitions from single-direction potential measurement to multi-directional potential measurement by sequentially applying voltage in the X-direction and then the Y-direction. This dimensional approach enables the system to extract two-point contact information from a single resistance film by utilizing potential distributions along orthogonal axes, eliminating the need for complex divided film structures
2Ease of manufacture
If conventional 4-wire touch panel is used, then manufacturing cost is reduced, but position detection accuracy for two contact points deteriorates
Solution Approach 1:
The patent introduces dynamic switching of voltage application directions, alternating between X-direction voltage application and Y-direction voltage application. This dynamic measurement approach enables the conventional 4-wire touch panel to accurately detect two contact points by capturing potential distributions from multiple directional perspectives, transforming a static single-function system into a dynamic multi-functional detection system
Solution Approach 2:
The patent changes the measurement parameters by sequentially varying the voltage application direction (X-direction first, then Y-direction) and measuring corresponding potential distributions. This parameter variation allows the conventional 4-wire touch panel to extract sufficient information for two-point contact detection without requiring additional hardware components, thereby maintaining cost-effectiveness while improving detection accuracy
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 accurate detection of two contact points with reduced manufacturing costs by utilizing existing 4-wire touch panel technology, improving position detection accuracy without the need for complex structures.
Implementation Method 1
a first resistance film having first and second electrodes provided one on each end in a first direction and a second resistance film having third and fourth electrodes one on each end in a second direction orthogonal to the first direction
Data Source
AI summary
A position detection method that includes calculating a distance between 2 contact points in a first direction by measuring a potential of a first electrode in a state where a power supply voltage is applied to the first electrode and a second electrode is grounded, calculating a distance between 2 contact points in a second direction by measuring a potential of a third electrode in a state where a power supply voltage is applied to the third electrode and a fourth electrode is grounded, and correcting the distance between the 2 contact points in the first direction obtained by the potential of the first electrode in accordance with the distance between the 2 contact points in the second direction obtained by the potential of the third electrode.