Resistive Touch Screen Double-Point Detection via Series Test Resistors
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Solution Overview
Problem
Resistive touch screens are limited to single-point touching detection, preventing accurate identification of double-point touches and limiting their application in multi-touch scenarios.
Innovation Solution
Incorporating test resistors on the X and Y axes of the touch screen, with reference voltage values obtained during single-point touching, to differentiate between single-point and double-point touches by analyzing voltage changes, and identifying gestures such as no motion, magnification, shrinkage, and rotation based on voltage trends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If single-point touching detection is used on resistive touch screen, then the structure remains simple and cost is low, but double-point touching cannot be detected accurately
Solution Approach 1:
The patent divides the detection process into two independent parts: a first detection unit that generates first voltage values for X-axis testing, and a second detection unit that generates second voltage values for Y-axis testing. This segmentation allows the system to handle multiple touching points by processing voltage data from different axes separately, then combining the results to identify double-point touches without requiring a completely new detection architecture.
Solution Approach 2:
The patent transitions from single-point detection to double-point detection by adding a dimensional aspect - using both X-axis and Y-axis voltage measurements simultaneously. By comparing voltage changes across both dimensions, the system can distinguish between single-point and double-point touches, effectively adding detection capability without fundamentally redesigning the resistive touch screen structure.
2Measurement precision
If test resistors and voltage analysis are added to enable double-point detection, then detection accuracy improves, but device complexity increases
Solution Approach 1:
The patent uses the existing resistive touch screen structure itself to enable double-point detection. The test resistors are integrated into the current circuit architecture, and the voltage values are obtained through the same ADC converter that would be used for single-point detection. This self-service approach allows the system to leverage existing components rather than requiring entirely separate detection hardware, thereby limiting the increase in device complexity.
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 double-point detection and gesture recognition, expanding the application range of resistive touch screens beyond single-point interactions, enhancing user experience and compatibility with multi-touch applications.
Implementation Method 1
When the pressure on the screen of the resistive touch screen is big enough, the first conducting layer panel and the second conducting layer panel contact at Touching Point P and then conduct the current
Implementation Method 2
a first test resistor Rx is set in series on the X axis, and a second test resistor Ry is set in series on the Y axis
Data Source
AI summary
Disclosed are a resistive touch screen, and a double-point detection processing method and device thereof. A screen body of the resistive touch screen comprises a first conducting layer panel and a second conducting layer panel. An X axis formed by two electrical connection ends on the first conducting layer panel is in series connection with a first test resistor, and a Y axis formed by two electrical connection ends on the second conducting layer panel is in series connection with a second test resistor. If point touch exists on the resistive touch screen, a first voltage value at an end of the test resistor and a second voltage value at an end of the second test resistor are acquired. Embodiments of the present invention can implement double-point touch detection on the resistive touch screen.