Capacitive Touch Sensor Non-Crossing Conductive Lines
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Solution Overview
Problem
Traditional capacitive touch sensors with crossing conductive lines face challenges in detecting a sufficient number of distinguishable inputs, requiring complex array designs to handle multiple inputs effectively.
Innovation Solution
A capacitive touch sensor system utilizing non-crossing conductive lines that form distinct line sequences in different directions, allowing for the detection of multi-dimensional touch inputs without the need for a grid-based architecture, thereby simplifying the sensor design and reducing hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional grid array designs with crossing conductive lines are used, then the number of distinguishable inputs can be increased, but the device complexity and manufacturing difficulty increase significantly
Solution Approach 1:
The patent transitions from traditional 2D grid arrays to a 3D stacked architecture where multiple sensor layers are vertically arranged. Each layer contains non-crossing conductive lines that are isolated from other layers by insulating structures, enabling multi-dimensional gesture detection without increasing in-plane line complexity. This vertical dimensionality allows the system to detect inputs in multiple directions and planes simultaneously.
Solution Approach 2:
The sensor system is divided into multiple independent sensor layers, each with its own set of non-crossing conductive lines. Each layer can be independently manufactured and then stacked together. This segmentation allows each layer to use simpler non-crossing line patterns while collectively providing complex multi-directional input detection capability across all layers.
2Adaptability or versatility
If complex array designs are used to detect larger number of inputs, then the detection capability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
By moving to a 3D stacked architecture, the patent reduces the requirement for high-precision alignment in the 2D plane. The vertical stacking allows conductive lines on different layers to be isolated and aligned more easily using through-hole techniques, as each layer can be manufactured separately and then precisely positioned in the vertical dimension rather than requiring complex in-plane alignment of crossing lines.
Solution Approach 2:
Insulating structures and through-holes serve as intermediary elements between conductive lines on different layers. These intermediaries provide physical isolation and alignment references that simplify the manufacturing process, allowing each layer to be manufactured with standard precision requirements while maintaining overall system accuracy through the intermediary structures.
3Ease of manufacture
If non-crossing conductive lines are used, then the manufacturing process is simplified, but the number of distinguishable inputs decreases
Solution Approach 1:
The patent compensates for the reduced input detection capability of non-crossing lines by adding a vertical dimension with multiple stacked layers. Each layer contributes additional detection dimensions, and the combination of layers enables the system to distinguish multiple gesture types including direction, plane, and sequence information that would require complex crossing line patterns in a single layer.
Solution Approach 2:
Each conductive line in the non-crossing pattern serves multiple functions: it detects touch input in its own layer, provides reference signals for adjacent layers, and contributes to detecting gestures in multiple directions when combined with lines from other layers. This multi-functionality allows simpler non-crossing lines to achieve complex detection capabilities through their roles across multiple layers.
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
Enables efficient detection of multi-dimensional user gestures with fewer conductive lines, reducing the complexity and cost of sensor production while maintaining effective input recognition.
Implementation Method 1
The touch data is based at least in part on a change in capacitance associated with the two or more non-crossing conductive lines
Data Source
AI summary
Systems and methods for interactive objects including conductive lines are provided. An interactive object may comprise a capacitive touch sensor comprising two or more non-crossing conductive lines that form at least a first conductive line pattern. The first conductive line pattern may comprise a first, second, and third sequence of the two or more non-crossing conductive lines relative to a respective first, second, and third input direction. The interactive object may be configured to detect touch input to the capacitive touch sensor based on a change in capacitance associated with the two or more non-crossing conductive lines, identify at least one of the first, second, or third line sequence based on the touch input to the capacitive touch sensor, and determine a respective gesture corresponding to the first, second, or third sequence of two or more non-crossing conductive lines.