Matrix Sensor Receive Isolation via Intermediary Antennas
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Solution Overview
Problem
Existing touch sensors face challenges in accurately detecting hand position and movement without interference from nearby digits, particularly in infusion systems where signals from nearby digits can be confused with signals from another digit.
Innovation Solution
The use of capacitive touch sensors employing a multiplexing scheme based on orthogonal signaling such as frequency-division multiplexing (FDM), code-division multiplexing (CDM), or hybrid modulation techniques, combined with isolation antennas to reduce interference and enhance finger separation, allowing for the detection of touch events and gestures with low latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive touch sensors are used to detect hand position and movement, then touch and hover events can be detected, but signals from nearby digits interfere with signal detection accuracy
Solution Approach 1:
The sensor array is divided into multiple independently controllable sensor elements arranged in a matrix pattern. Each sensor element can be individually activated or isolated, allowing the system to segment the detection field and reduce interference from nearby digits by only activating relevant sensor elements for each detection task.
Solution Approach 2:
Isolation elements are introduced between adjacent sensor elements in the matrix array. These isolation elements act as intermediaries that block or reduce capacitive coupling between neighboring sensor elements, thereby preventing signal interference from nearby digits while maintaining detection capability.
2Measurement precision
If signal infusion is used to enhance appendage detection, then detection range is improved, but signals from multiple digits become confused and难以 distinguish
Solution Approach 1:
The matrix sensor array enables spatial segmentation of detected digits by assigning unique identification patterns to different sensor elements. When multiple digits are detected, each digit's signal is mapped to specific sensor elements, allowing the system to separate and identify individual digits even when their signals overlap in the infusion field.
Solution Approach 2:
Different regions of the sensor array have specialized functions - some sensor elements are optimized for detecting specific digit positions or gestures. This local differentiation allows the system to maintain accurate digit separation by processing signals from different regions with region-specific algorithms.
3Measurement precision
If a dense matrix array of sensor elements is used, then detection precision is improved, but device complexity increases
Solution Approach 1:
Multiple sensor elements are electrically connected through conductive traces that merge signals from adjacent elements. This merging approach allows the system to maintain a dense physical array for high precision detection while reducing electrical complexity by combining signals from multiple elements into fewer output channels.
Solution Approach 2:
The matrix sensor array is designed so that each sensor element can serve multiple functions - detecting touch, hover, pressure, and gesture information simultaneously. This multi-functionality reduces the need for separate specialized sensors, thereby managing complexity while maintaining high detection precision across multiple parameters.
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
This approach enables accurate detection of hand position and movement with reduced interference, allowing for precise tracking of finger positions and gestures, even when fingers are not in direct contact with the sensor surface, improving the accuracy and reliability of touch and hover events.
Implementation Method 1
a sensor array including a plurality of antennas... capacitive touch sensors
Data Source
AI summary
A sensor system comprises a plurality of receiving antennas. Another antenna functions as an isolating antenna that assists in preventing a signal received at some of the receiving antennas from being interfered with by the other receiving antennas. The isolating antenna may be operably connected to a ground or the source of signal that is also infused into a user.