Capacitance Sensor Electrode Layout for Low-Wiring Multi-Touch
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Solution Overview
Problem
Conventional touch sensors are costly due to the need for multiple layers and extensive wiring, limiting their ability to efficiently detect multiple touch points without requiring a large number of measuring ports or pins on the controller.
Innovation Solution
A single-layer touch sensor device with a minimized wiring scheme that uses a substrate with inter-digitated electrodes and secondary traces to reduce the number of wires and layers, allowing for simultaneous detection of multiple contact points without a bezel, thereby reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple layers of materials and extensive wiring are used, then the sensing accuracy and ability to detect multiple touch points are improved, but the manufacturing cost increases
Solution Approach 1:
The touch sensor is divided into multiple electrode segments arranged in a matrix pattern on a single substrate. Each segment can be independently controlled and measured, allowing multiple touch points to be detected simultaneously. This segmentation enables the sensor to achieve multi-touch detection capability without requiring multiple separate sensor layers, thereby reducing manufacturing complexity and cost while maintaining detection accuracy.
Solution Approach 2:
The patent transitions from conventional single-layer or multi-layer structures to a single-substrate matrix arrangement where electrodes are organized in rows and columns. This two-dimensional arrangement allows any point on the surface to be uniquely identified by its row and column coordinates, enabling accurate multi-touch detection without requiring additional layers or extensive wiring, thus resolving the contradiction between detection capability and manufacturing cost.
2Adaptability or versatility
If multiple layers and extensive wiring are used, then the ability to detect multiple touch points is improved, but the device complexity increases
Solution Approach 1:
The electrode structure is segmented into multiple independent segments arranged in a matrix on a single substrate. Each segment corresponds to a specific region and can be independently addressed through row and column control lines. This segmentation enables the detection of multiple simultaneous touch points without requiring complex multi-layer structures or extensive wiring, thereby achieving high adaptability with reduced device complexity.
Solution Approach 2:
The single substrate with matrixarranged electrodes serves multiple functions: it provides the sensing surface, contains all electrode segments, and integrates the wiring structure. The row and column control lines collectively serve to both drive and read signals from all electrode segments simultaneously. This multi-functionality allows the device to detect multiple touch points without requiring separate dedicated structures for each function, reducing overall device complexity.
3Ease of manufacture
If a minimized wiring scheme with single layer is used, then the manufacturing cost is reduced, but the number of measuring ports or pins on the controller must be minimized
Solution Approach 1:
The patent employs a matrix arrangement of electrodes with row and column control lines on a single substrate. This two-dimensional wiring scheme allows any electrode segment to be accessed by the intersection of one row line and one column line. Consequently, the number of controller ports required is equal to the sum of row and column lines, which is significantly fewer than the number of individual electrode segments. This dimensional approach enables cost-effective single-layer manufacturing while managing controller interface requirements efficiently.
Solution Approach 2:
The matrix wiring structure inherently provides self-routing capabilities where row and column lines automatically intersect to define electrode segments. The controller can selectively activate specific row and column combinations to address individual segments without requiring dedicated ports for each segment. This self-service特性 of the matrix structure reduces the burden on the controller interface while maintaining the ability to detect multiple touch points, thus resolving the contradiction between manufacturing cost and controller complexity.
Data Source
AI summary
Embodiments for constructing capacitance sensing devices include, but are not limited to, forming a plurality of electrodes on a central portion of a substrate, the substrate comprising a central portion and an outer portion, forming a first plurality of conductors on the substrate, each of the first plurality of conductors being connected to and extending from at least one of the plurality of electrodes, and forming an insulating material on the outer portion of the substrate and at least partially over some of the first plurality of conductors. The constructing also includes forming a second plurality of conductors on the insulating material, wherein the second plurality of conductors and the insulating material are configured such that each of the second plurality of conductors is electrically connected to at least some of the first plurality of conductors and is insulated from the others of the first plurality of conductors.