Dual-Principle Touchscreen for Industrial Safety
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Solution Overview
Problem
Touchscreen devices in industrial automation systems face challenges in ensuring safety due to unintentional operating errors and interference, as existing security mechanisms are not adequately effective in preventing accidental touches and soiling.
Innovation Solution
Implementing a touchscreen device that utilizes at least two diverse functional principles for detecting touch, such as capacitive and pressure-sensitive technologies, to ensure reliable operation by requiring simultaneous interaction of both principles for safety-relevant actions, and dividing the touchscreen into areas with specific detection methods for each principle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touchscreen is used to improve ease of operation, then usability is improved, but unintentional operating errors and accidental touches increase
Solution Approach 1:
The patent combines two different sensing technologies (capacitive and pressure-sensitive sensors) into a single touchscreen system. Both sensor types detect touches independently, and their signals are merged to determine valid user actions. This merging allows the system to maintain ease of use while filtering out accidental touches through cross-validation of the two sensing mechanisms.
Solution Approach 2:
The touchscreen employs a composite sensing structure with both capacitive and pressure-sensitive sensor layers. This composite approach integrates two different detection principles into one system, enabling the touchscreen to distinguish between intentional user interactions and accidental touches by requiring both sensor types to detect the same touch event.
2Reliability
If redundant operating means are provided to improve safety, then safety requirements are met, but device complexity increases
Solution Approach 1:
Instead of providing separate redundant operating means (such as both physical buttons and touchscreen), the patent merges safety validation into the touchscreen itself by integrating two sensing technologies. The touchscreen controller evaluates both capacitive and pressure-sensitive signals to determine valid operations, eliminating the need for separate redundant controls while maintaining safety.
Solution Approach 2:
The touchscreen serves multiple functions: it provides the user interface for operation and simultaneously performs safety validation through dual sensing technologies. The same touchscreen surface handles both normal operation and safety-critical functions, making the device more versatile while reducing overall complexity.
3Measurement precision
If the touchscreen surface is made sensitive to improve detection, then touch detection is improved, but sensitivity to external interference and soiling increases
Solution Approach 1:
The patent uses a composite sensing structure with both capacitive and pressure-sensitive layers. This composite approach allows the system to maintain high touch detection sensitivity while filtering out external interference. The pressure-sensitive component specifically helps distinguish between deliberate touches and environmental factors like soiling or moisture, as it responds only to actual pressure application.
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 approach significantly enhances the fail-safety of touchscreen devices by reducing unintentional operations and detecting external interference, ensuring that only valid user actions trigger functions, thereby improving the overall safety and reliability of industrial automation systems.
Implementation Method 1
In the case of capacitive touchscreens, an electrical field is generated between the layers between different layers by applying a voltage. A touch causes a charge transport that changes the electric field and leads to a measurable current flow.
Implementation Method 2
an electrical field is generated between the layers between different layers by applying a voltage
Implementation Method 3
Pressure-sensitive (resistive) touch screens react to the pressure generated by a touch. As a rule, conductive layers are pressed together at the point of contact, which causes a current to flow between the layers, which can be detected using appropriate sensors.
Data Source
Figure 1~2
Figure 3
AI summary
The safety of operation of a touchscreen device (1, 11) with a touchscreen (2) is to be increased. For this purpose, a touchscreen (2, 12) is used in which at least two diverse functional principles are simultaneously implemented to achieve touch sensitivity. A safe operating action is defined as one that includes touching both a first sub-area (21) of the touchscreen (2, 12) and a second sub-area (22), wherein the touch detection in the first sub-area (21) is based on the first functional principle and the touch detection in the second sub-area (22) is based on the second functional principle. This largely prevents incorrect operation.