Dual-Sided Touch Sensor Layout for Surface Input Differentiation
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Solution Overview
Problem
Traditional sensor designs with conductive lines face challenges in being integrated within objects, particularly in distinguishing between intentional and unintentional touch inputs at different surfaces of a touch sensor.
Innovation Solution
A sensor system with a touch sensor having a set of conductive sensing elements integrated with a substrate, allowing it to differentiate between touch inputs at a first surface and a second surface using a single set of conductive sensing elements, without the need for additional shielding layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional sensor designs with conductive lines are used, then the sensor can be integrated into interactive objects, but it cannot distinguish between intentional and unintentional touch inputs at different surfaces
Solution Approach 1:
The single set of conductive sensing elements is functionally segmented into first and second subsets based on their spatial distribution. The sensing elements are divided into those closer to the first surface (first subset) and those closer to the second surface (second subset), allowing differential analysis of touch inputs without physical separation of the sensing elements themselves.
Solution Approach 2:
The patent introduces a third dimension (depth or distance from surfaces) to differentiate touch inputs. By analyzing which subset of sensing elements (first or second subset) responds more strongly to a touch input, the system can determine whether the input originated from the first surface or the second surface, effectively adding a depth dimension to the 2D sensing plane.
2Reliability
If additional shielding layers are added to distinguish touch inputs, then touch input management is improved, but the device complexity and integration difficulty increase
Solution Approach 1:
The existing conductive sensing elements serve dual purposes: they detect touch inputs and simultaneously provide the information needed to distinguish between intentional and unintentional inputs. The sensing elements themselves, through their spatial distribution and response patterns, enable the discrimination function without requiring additional shielding layers or structural modifications.
Solution Approach 2:
The conductive sensing elements perform multiple functions: they detect touch inputs, determine touch location, and distinguish between intentional and unintentional inputs based on which subset (first or second) responds more strongly. This multi-functionality eliminates the need for separate shielding structures while maintaining reliable touch input management.
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 system effectively distinguishes between intentional and unintentional touch inputs, enabling improved touch input management and integration with interactive objects such as wearable devices.
Implementation Method 1
capacitive touch sensor that is configured to detect touch input
Data Source
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AI summary
A sensor system includes a touch sensor having a plurality of conductive sensing elements integrated with a flexible substrate. A first subset of sensing elements is coupled to a first side of the flexible substrate and a second subset of sensing elements is coupled to a second side of the flexible substrate. The sensor system is configured to obtain touch data associated with a touch input to the touch sensor. The touch data is based at least in part on a respective response to the touch input by the plurality of conductive sensing elements. The sensor system is configured to determine whether the touch input is associated with the first subset of conductive sensing elements or the second subset of conductive sensing elements based at least in part on the respective response to the touch input by the sensing elements.