Curved Touch Panel Sensitivity Adjusting Layer
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Solution Overview
Problem
Conventional electrostatic capacitive touch panels face challenges in maintaining uniform detection sensitivity across curved surfaces due to varying distances between the operation surface and the electrostatic sensor, leading to inconsistent electrostatic capacity detection and potential erroneous operations.
Innovation Solution
Incorporating a sensitivity adjusting layer with varying electric permittivity between the operation surface and the electrostatic sensor, where regions with larger distances have higher electric permittivity, to ensure consistent electrostatic capacity detection regardless of touch position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operation surface is made convexly curved to improve ergonomics or design, then the aesthetic appearance and user comfort are improved, but the detection sensitivity becomes non-uniform across different touch positions
Solution Approach 1:
The patent applies local quality by making the electric permittivity of the sensitivity adjusting layer position-dependent. Specifically, regions closer to the electrostatic sensor have higher electric permittivity while regions farther away have lower electric permittivity. This spatial variation in material property compensates for the distance variation caused by the convexly curved operation surface, ensuring uniform detection sensitivity across all touch positions while maintaining the ergonomic benefits of the curved design.
2Measurement precision
If the electrode area is enlarged to improve detection sensitivity, then the detection sensitivity is improved, but the device size and complexity increase
Solution Approach 1:
The patent changes the electric permittivity parameter of the sensitivity adjusting layer to compensate for distance variations. By adjusting the electric permittivity distribution rather than enlarging the electrode area, the invention achieves uniform detection sensitivity across the curved surface without increasing the physical size of the electrodes or the overall device complexity. This parameter-based approach provides a more compact and simpler solution compared to electrode area expansion.
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 ensures uniform detection sensitivity across the operation surface, preventing false detections and improving the accuracy of touch position recognition on curved surfaces.
Implementation Method 1
The sensitivity adjusting layer is adjusted so that a region in which a distance between the operation surface and the detection surface is larger has a higher electric permittivity
Implementation Method 2
An input device such as an electrostatic capacitive touch panel is variously used in a smartphone, an on-vehicle electronic device, etc.
Data Source
AI summary
An input device according to an embodiment includes an electrostatic sensor, an operation surface, and a sensitivity adjusting layer. The electrostatic sensor includes a planar detection surface. The operation surface is non-parallel to the detection surface. The sensitivity adjusting layer is adjusted so that a region in which a distance between the operation surface and the detection surface is larger has a higher electric permittivity.