Conductive Web for Uniform Electric Field Sensitivity
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Solution Overview
Problem
User input technologies based on deformation of an electric field face challenges such as sensitivity and resolution variations across the monitored area, making calibration difficult and increasing the likelihood of false key presses, especially with different finger sizes and gloves.
Innovation Solution
A sensor arrangement with a conductive web between the sensor and the external surface of the user input means, which modulates the electric field to linearize sensitivity and improve detection accuracy, allowing for robust and cost-effective user input detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a strong electric field source is used for user input detection, then the detection range is extended, but the field lines become bent and sensitivity distribution becomes non-uniform across the monitored area
Solution Approach 1:
A conductive web is introduced as an intermediary element between the electric field source and the monitored area. This web modifies the electric field distribution to achieve more uniform field lines and consistent sensitivity across the detection area, while preserving the extended detection range provided by the strong field source
2Device complexity
If a single large sensor is used for multiple keys, then the device complexity is reduced, but the algorithm complexity for determining key presses increases and false key indications occur
Solution Approach 1:
The monitored area is divided into distinct key regions by introducing conductive webs that create separate detection zones. This segmentation allows each key area to be independently detected with consistent sensitivity, eliminating false key indications while maintaining the simplicity of using a single large sensor element
3Measurement precision
If the electric field detection threshold is set to detect all touches, then sensitivity is maximized, but false detections increase due to variations in finger size and gloves
Solution Approach 1:
The conductive web creates locally optimized electric field distributions for each key area, ensuring consistent sensitivity characteristics across different regions. This local optimization allows for a unified threshold setting that reliably detects all valid touches while minimizing false detections, regardless of finger size or glove usage
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
The conductive web enhances the accuracy of user input detection, simplifies the evaluation of electric field changes, and reduces the number of erroneous interactions by providing consistent sensitivity across the input area, improving usability and reducing costs.
Implementation Method 1
a sensor adapted to generate an electric field in an area of the user input means and to enable a detection of a change in the electric field
Implementation Method 2
A sensor arrangement with a conductive web between the sensor and the external surface of the user input means, which modulates the electric field to linearize sensitivity
Data Source
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AI summary
A sensor arrangement for an electronic device with user input means comprises a sensor. The sensor is adapted to generate an electric field in an area of the user input means and to enable a detection of a change in the electric field. The sensor arrangement further comprises a conductive web. The conductive web is arranged between the sensor and an external surface of the user input means, in order to concentrate the volume of the generated electrical field.