Dual Solid Diamond Capacitive Sensor Pattern for Small Object Detection
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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-patterned sensor arrays.
Innovation Solution
The implementation of a dual solid diamond (DSD) capacitive sensor pattern with improved signal disparity characteristics, which increases coupling between transmit and receive electrodes, enhancing sensitivity for smaller object detection while maintaining self-capacitance coupling, and using a capacitive sensor array with a matrix of electrodes to determine the presence and location of conductive objects by measuring mutual capacitances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a diamond-patterned sensor array is used to improve sensitivity for smaller object detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The sensor array is segmented into multiple independently controllable electrode groups arranged in a diamond pattern. Each electrode can be independently driven and measured, allowing the complex sensing task to be divided into simpler sub-tasks that can be processed separately, thereby managing device complexity while maintaining high measurement precision.
Solution Approach 2:
The patent transitions from traditional linear or grid electrode arrangements to a diamond-patterned two-dimensional arrangement. This dimensional reorganization optimizes the spatial distribution of electrodes, improving sensitivity for detecting smaller objects while maintaining a manageable structural complexity through symmetric geometric patterns.
2Measurement precision
If dual solid diamond pattern with increased coupling is implemented to improve sensitivity, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The dual solid diamond pattern introduces controlled asymmetric coupling configurations where adjacent electrodes have optimized coupling strengths. This asymmetric design allows for improved signal disparity characteristics and sensitivity while providing tolerance in manufacturing by not requiring perfectly symmetric alignment, thus balancing manufacturing precision requirements with performance improvement.
Solution Approach 2:
The patent optimizes electrical parameters such as electrode spacing, coupling capacitance values, and drive signal amplitudes to enhance sensitivity. By adjusting these parameters within acceptable manufacturing tolerances, the system achieves improved signal disparity characteristics without requiring extremely precise manufacturing, thereby reducing the stringency of manufacturing precision requirements.
3Measurement precision
If capacitive sensor array with matrix of electrodes is used to detect multiple touches, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The matrix of electrodes is segmented into multiple independently addressable rows and columns, allowing each intersection point to be individually sensed. This segmentation enables accurate detection of multiple simultaneous touches by measuring capacitance changes at specific matrix intersections, while the modular structure manages device complexity through systematic organization of numerous electrodes.
Solution Approach 2:
The capacitive sensor array utilizes the natural capacitive coupling between adjacent electrodes and the human body's inherent capacitance to detect touches. The system requires minimal additional active components because the electrodes themselves serve both as signal sources and sensors, reducing overall device complexity while maintaining high measurement precision for multiple touch detection.
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 higher sensitivity for tracking smaller objects and improved detection of multiple touches with increased manufacturing complexity, resulting in a more effective capacitive touch-sensing system.
Implementation Method 1
measuring mutual capacitances between pairs of sensor electrodes
Implementation Method 2
increases coupling between transmit and receive electrodes, enhancing sensitivity for smaller object detection
Data Source
AI summary
A capacitive sensor array comprises large sensor electrodes and small sensor electrodes formed from a single layer of conductive material. Each sensor electrode of a first set of small sensor electrodes is electrically connected to a first pad. A first axis crosses two or more of the sensor electrodes of the first set of small sensor electrodes, and each small sensor electrode of the first set of small sensor electrodes is located on an opposite lateral side of one of the large sensor electrodes from another small sensor electrode of the first set. Each sensor electrode of a second set of small sensor electrodes is electrically connected to a second pad. A second axis crosses two or more of the sensor electrodes of the second set of small sensor electrodes, and each small sensor electrode of the second set is located on an opposite lateral side of one of the large sensor electrodes from another small sensor electrode of the second set.