3D Capacitive Sensing Electrodes for Multi-Directional Detection
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Solution Overview
Problem
Conventional capacitive touch sensors are limited in detecting user interactions from multiple directions due to their two-dimensional geometry, which restricts the range of detection to a specific plane, failing to effectively capture interactions from various angles and orientations.
Innovation Solution
The development of three-dimensional capacitive sensing mechanisms using electrodes with significant measurements in all three dimensions, allowing for the detection of changes in capacitance from a 270 to 360-degree radius, enabling multi-directional user interactions by forming transmitting and receiving electrodes that emit and sense electric fields across a broader spatial range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two-dimensional capacitive sensor electrodes are used, then the sensor structure is simple and easy to manufacture, but the detection range is limited to a specific plane and cannot capture interactions from various angles
Solution Approach 1:
The patent transitions from two-dimensional planar electrodes to three-dimensional volumetric electrodes. The receiving electrode is formed as a substantially cylindrical structure extending vertically from the substrate, creating a three-dimensional detection volume. This dimensional change enables the sensor to detect capacitive interactions from multiple directions (270-360 degree radius) rather than being limited to a single plane, directly resolving the contradiction between detection range and structural simplicity.
2Adaptability or versatility
If three-dimensional capacitive sensing mechanisms are implemented, then multi-directional user interactions can be detected, but the device complexity increases
Solution Approach 1:
The three-dimensional sensing mechanism is segmented into distinct functional components: a transmitting electrode for generating electric fields, a receiving electrode with substantially cylindrical geometry for sensing, and a substrate providing structural support. This segmentation allows each component to be optimized independently while maintaining overall functionality, managing the complexity through modular design.
Solution Approach 2:
By forming the receiving electrode as a vertical cylinder extending from the substrate, the patent creates a three-dimensional detection volume that enables multi-directional interaction detection. This dimensional transformation provides the necessary spatial range for detecting user interactions from various angles while maintaining a relatively simple structural implementation.
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 comprehensive and versatile user interaction with computing devices by allowing detection of charged or conductive objects from multiple directions, enhancing the functionality of capacitive touch sensors beyond traditional two-dimensional limitations.
Implementation Method 1
a transmitting electrode configured to emit a charge generating an electric field
Implementation Method 2
receiving electrode to sense the electric field, such that the electrodes are coupled. The coupling of the electrodes creates a capacitance used as a reference
Implementation Method 3
An external object having a charge or being conductive, such as a hand or finger of a user, may alter the reference capacitive coupling between the electrodes
Data Source
AI summary
Techniques for three dimensional capacitive sensing are described herein. The techniques include a system including a three dimensional transmitting electrode to emit charge having an electric field. The system may include a three dimensional receiving electrode to receive the charge creating a capacitance between the transmitting electrode and the receiving electrode.