Resistive Touch Panel Two-Point Detection via Resistance Variance Ratio
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Solution Overview
Problem
Existing resistive touch panel detection methods cannot accurately detect the inclination angle, distance, and actual coordinates of two points during a two-point touch, limiting the ability to perform operations like rotation, precise scaling, and combined actions such as click and drag.
Innovation Solution
A method and apparatus that calculate the resistance variance ratio between the X and Y planes using voltage detections before and after a two-point touch, allowing for the determination of inclination angle, distance, and coordinates by applying current or voltage excitation and using external resistors to detect voltage differences, with corresponding relationships to derive these values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the existing detection method based on partial pressure principle is used for two-point touch, then the midpoint position can be detected, but the inclination angle, specific distance size and actual coordinates of the two points cannot be obtained
Solution Approach 1:
The patent divides the detection process into multiple independent measurement steps: first detecting the midpoint position using the partial pressure principle, then separately measuring the resistance variance ratio to obtain inclination angle, and finally calculating the specific distance. This segmentation allows each parameter to be detected independently and accurately without the information loss that occurs when using a single detection method for all parameters.
Solution Approach 2:
The patent introduces the resistance variance ratio as an intermediary parameter that mediates between the midpoint detection and the final calculation of inclination angle and distance. By measuring the resistance variance ratio of the Y plane relative to the X plane, the system can derive the inclination angle and specific distance without directly measuring these difficult-to-obtain parameters, thus avoiding information loss.
2Measurement precision
If voltage excitation and external resistors are used to detect voltage differences, then the resistance variance ratio can be calculated, but the device complexity increases
Solution Approach 1:
The patent makes the existing voltage detection circuit perform multiple functions: it not only detects the midpoint position but also measures the resistance variance ratio by applying voltage excitation and detecting voltage differences with external resistors. This multi-functionality allows the system to obtain both positional and resistance information without adding separate dedicated measurement devices, thus limiting the increase in device complexity.
Solution Approach 2:
The patent changes the detection parameter from direct position measurement to voltage difference measurement through resistance variance ratio calculation. By transforming the measurement into an electrical parameter (voltage difference) that can be obtained through existing circuitry with external resistors, the system achieves precise resistance detection without requiring complex mechanical or optical measurement devices.
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 inclination angle, distance, and coordinates of two points, enabling more complex touch operations like rotation and precise scaling, improving the functionality of two-point touch interactions.
Implementation Method 1
an X direction coordinate and a Y direction coordinate of the touch point, i.e., a position of the touch point, can be detected based on a partial pressure principle
Implementation Method 2
calculating a resistance variance ratio of a Y plane relative to an X plane, based on voltage detections before touching and after a two-point touch occurs
Implementation Method 3
applying current excitation to the X plane and the Y plane, respectively, and detecting a voltage of an end which is of each of the X plane and the Y plane
Data Source
AI summary
Provided are a resistive touch panel detection method and apparatus. A resistance variance ratio of a Y plane relative to an X plane is calculated based on voltage detections before touching and after a two-point touch occurs; and then the inclination angle is calculated based on corresponding relationship between the inclination angle and the resistance variance ratio. To obtain a distance between the two points, the present invention the resistance variance ratio and a first ratio of a resistance variance of any one of the X plane and the Y plane relative to a total resistance of the any one plane are calculated; then a second ratio of an equivalent contact resistance at a midpoint relative to the total resistance is calculated; and the distance is calculated based on the resistance variance ratio, the first ratio, the second ratio, and a correlated relationship of the distance between the two points.