Resistive Touch Panel Gesture Detection via Voltage and Current Measurement
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Solution Overview
Problem
Conventional resistive film type touch panel input devices are unable to detect complex gestures involving two touched points, limiting their functionality to simple gestures like separation, approach, and rotation.
Innovation Solution
A touch panel input device with two resistive films, electrode pairs, and a discriminating mechanism that measures and analyzes voltage and current changes between touch points to track the trajectories of two touch points, enabling the detection of complex gestures by determining the position and distance between points and their movement patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If voltage measurement is used to detect touch point positions, then the position detection is simple, but complex gestures involving two touch points cannot be detected
Solution Approach 1:
The patent combines voltage measurement and current measurement systems into a single touch panel device. The voltage measurement provides touch point positions while the current measurement provides distance information between touch points. By merging these two measurement approaches, the device achieves comprehensive gesture detection capability including complex gestures that require both position and distance information.
Solution Approach 2:
The patent introduces current measurement as an intermediary parameter to bridge the gap between simple voltage-based position detection and complex gesture recognition. The current value serves as a mediator that provides distance information between touch points, enabling the system to detect gestures like pinching and spreading that require both position and relative distance data.
2Measurement precision
If only voltage measurement is implemented, then the device structure remains simple, but the distance between two touch points cannot be determined
Solution Approach 1:
The patent segments the measurement function into two independent parts: voltage measurement for position detection and current measurement for distance detection. This segmentation allows each measurement system to be optimized for its specific purpose while working together to provide comprehensive gesture information. The current measurement specifically targets distance between touch points, complementing the voltage-based position data.
3Adaptability or versatility
If conventional voltage measurement method is used, then the system is easy to operate, but gestures like pinching and spreading cannot be detected
Solution Approach 1:
The patent makes the measurement system universal by enabling it to detect multiple types of gestures through a combination of voltage and current measurements. The same measurement system can detect simple touches, pinching gestures, spreading gestures, and other complex interactions. This multi-functionality is achieved by processing both voltage (position) and current (distance) data together to recognize various gesture patterns.
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 the detection of complex gestures by accurately determining the position, distance, and movement speed of two touch points, enhancing the input capabilities beyond what conventional devices can achieve.
Implementation Method 1
the divided voltage which is measured between the X electrode pair corresponds to the resistance value of the resistive film from one of the electrodes to the touch point
Implementation Method 2
the resistance value between the two points and the value of current that flows between the electrode pair will correspond to each other, and the resistance value between the two points is proportional to the distance between the two points
Data Source
AI summary
Detection of complex input by two touched points are enabled to be detected by a resistive film type touch panel input device equipped with two resistive films facing each other with a minute gap therebetween; a first electrode pair; a second electrode pair extending in directions perpendicular to the first electrode pair; means for applying voltages between the first electrode pair and between the second electrode pair; means for measuring the voltage which is divided at two touch points with respect to the first electrode pair and the second electrode pair, when the resistive films are caused to contact each other by being touched at two points; means for measuring currents that flow between the first electrode pair and between the second electrode pairs when the touch occurs; and discriminating means, for discriminating the trajectories of the two touch points based on the values of the measured voltages and currents.