Touch Panel Electrode Grounding for Erroneous Detection
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Solution Overview
Problem
Resistance film type touch panels experience erroneous detection and coordinate deviation due to increased electric capacity from aging or environmental changes, leading to malfunction and input impossibility, especially in thin and narrow designs.
Innovation Solution
A touch panel device with a controller that grounds the electrode on the resistance film of the voltage detection side before detection, discharging electric charges and reducing circuit resistance to prevent erroneous touch detection, using a configuration of resistance films and switches to accurately detect touch presence and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch panel uses a resistance film type structure with electrodes on both ends, then touch detection functionality is achieved, but electric capacity increases due to aging or environmental changes causing erroneous detection and coordinate deviation
Solution Approach 1:
The controller performs a grounding operation before touch detection to discharge electric charges accumulated on the resistance film. This preliminary action prevents voltage residuals from causing erroneous detection or coordinate deviation, thereby maintaining reliable touch detection functionality throughout the extended usable life of the touch panel even as electric capacity increases due to aging or environmental changes
Solution Approach 2:
The controller changes the electrical state of the resistance film by grounding the electrode before detection. This parameter change (from charged to discharged state) eliminates the harmful effect of accumulated electric charges, preventing detection errors and coordinate deviation while maintaining the touch panel's operational reliability over time
2Measurement precision
If voltage is applied to the resistance film for detection, then touch position can be detected, but residual voltage causes erroneous detection and input impossibility
Solution Approach 1:
The controller extracts or removes the residual voltage from the resistance film by grounding the electrode before touch detection. This extraction of harmful residual voltage prevents erroneous detection and input impossibility, ensuring both accurate touch position detection and reliable input functionality
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
This solution effectively prevents erroneous detection and coordinate deviation, ensuring reliable touch detection and input functionality by ensuring voltage convergence before coordinate detection, thereby extending the usable life of high-capacity touch panels.
Implementation Method 1
the controller controls the operation of the switch connected to the electrode on the resistance film of the voltage detection side so that the electrode on the resistance film of the voltage detection side is grounded
Implementation Method 2
detects presence or absence of touch and a position of the touch based on a voltage detected from the electrode on a resistance film of a voltage detection side
Data Source
AI summary
A touch panel device includes: a first resistance film and a second resistance film each of which includes an electrode; a switch connected to the electrode; a controller that controls operation of the switch; and a detector that, when a voltage is applied to a resistance film of a voltage applied side among the first resistance film and the second resistance film, detects presence or absence of touch and a position of the touch based on a voltage detected from the electrode on a resistance film of a voltage detection side among the first resistance film and the second resistance film; wherein before detection operation by the detector, the controller controls the operation of the switch connected to the electrode on the resistance film of the voltage detection side so that the electrode on the resistance film of the voltage detection side is grounded.