Flipped Cell Sensor Pattern for Capacitive Touch Sensitivity
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Solution Overview
Problem
Current capacitive touch-sensor technologies face challenges in accurately detecting multiple touches and tracking smaller objects, such as stylus points, due to limitations in sensitivity and manufacturing complexity, particularly in diamond patterns that increase signal disparity and manufacturing yield.
Innovation Solution
The implementation of a dual solid diamond (DSD) capacitive sensor pattern with improved signal disparity characteristics and higher sensitivity, which includes additional bridges to enhance coupling between transmit and receive electrodes, allowing for better tracking of smaller objects while maintaining self-capacitance coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dual solid diamond (DSD) capacitive sensor pattern with additional bridges is implemented, then sensitivity for detecting smaller objects is improved, but manufacturing complexity increases
Solution Approach 1:
The sensor pattern is segmented into multiple diamond-shaped unit cells, each containing transmit and receive electrodes arranged in a specific configuration. This segmentation allows for improved sensitivity while maintaining a modular structure that can be manufactured using standard processes.
Solution Approach 2:
The patent implements different electrode configurations in different regions of the touch sensor. Specifically, the DSD pattern uses additional bridges in certain unit cells to enhance coupling between transmit and receive electrodes, creating local variations in electrical properties that improve overall sensitivity without uniformly increasing complexity across the entire device.
2Measurement precision
If a dual solid diamond (DSD) capacitive sensor pattern is used, then tracking capabilities for smaller objects are improved, but metal bridge visibility increases
Solution Approach 1:
The DSD pattern strategically places additional bridges only in specific unit cells where enhanced coupling is needed for improved tracking, rather than uniformly across the entire sensor array. This localized approach improves tracking capabilities while minimizing the overall visibility of metal bridges.
Solution Approach 2:
The patent addresses metal bridge visibility by considering the vertical dimension and optical properties. The bridges are designed with specific geometries and orientations that reduce their visual impact when viewed from the front, allowing the DSD pattern to achieve improved tracking without excessive aesthetic compromise.
3Measurement precision
If additional bridges are added to enhance coupling between electrodes, then signal disparity is improved, but manufacturing yield decreases
Solution Approach 1:
The sensor is divided into multiple identical or near-identical unit cells, each containing the bridge structures. This segmentation allows for standardized manufacturing processes that can produce many units with consistent electrical characteristics, improving signal disparity control while maintaining manufacturing yield through repeatability.
Solution Approach 2:
The patent optimizes the geometric parameters of the bridges (such as width, length, and orientation) to achieve the desired coupling enhancement while remaining within the capabilities of standard manufacturing processes. By carefully selecting these parameters, the design improves signal disparity without pushing manufacturing limits that would reduce yield.
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 DSD pattern provides enhanced sensitivity for detecting smaller objects and improved tracking capabilities, but at the cost of increased manufacturing complexity and potential visibility of metal bridges, offering a trade-off between sensitivity and manufacturing yield.
Implementation Method 1
capacitive touch-sensor technologies face challenges in accurately detecting multiple touches and tracking smaller objects
Data Source
AI summary
Embodiments of a capacitive sensor array may comprise a plurality of large sensor electrodes and, for each of the large sensor electrodes, a first plurality of small sensor electrodes each capacitively coupled with the large sensor electrode, and each conductively coupled by one of a first set of routing traces to one of a first set of conductors located in a first edge region, and a second plurality of small sensor electrodes capacitively coupled with the large sensor electrode and conductively coupled by a second set of routing traces to a second set of conductors in a second edge region. The first set of routing traces is located in a first routing channel and the second set of routing traces is located in a second routing channel, where the first and second routing channels are located along different sides of the large sensor electrode.