Rotatable Interface Capacitive Sensing for Automotive Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing proximity sensor devices in electronic systems face challenges in accurately detecting the rotational position and state of a rotatable interface, particularly in environments where standard sensing functionality needs to be disabled for safety reasons, such as in automobiles, to prevent unintended input while driving.
Innovation Solution
A rotatable interface with a conductor region and a patterned region is electrically coupled to specific electrodes of an input device, receiving a reference signal and generating a modified sensing signal that allows for accurate determination of rotational position, even when standard capacitive sensing is disabled, using a combination of coupling electrodes and processing circuitry to interpret the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard capacitive sensing functionality is disabled in automobile environments, then safety is improved by preventing unintended input, but the ability to detect rotational position and state is lost
Solution Approach 1:
The sensing system is segmented into two distinct operational modes: standard capacitive sensing for general use and a specialized rotational sensing mode for automobile environments. The rotatable interface is divided into separate conductor regions and patterned regions that can be independently activated, allowing the system to disable standard sensing while maintaining rotational detection capability through a dedicated signal path involving reference electrodes and sensing electrodes.
Solution Approach 2:
The system changes operational parameters by switching between different sensing configurations. In automobile mode, the system modifies electrode activation patterns, signal frequencies, and processing algorithms to enable rotational position detection without relying on standard capacitive sensing, thereby maintaining safety while preserving measurement precision.
2Adaptability or versatility
If a rotatable interface is added to an input device, then user input capability is improved, but device complexity increases
Solution Approach 1:
The rotatable interface is designed to perform multiple functions: it can detect rotational position, determine operational state (such as pressed or released), and interface with existing display and processing systems. The same electrode structure serves both conductor and patterned region functions, and the processing circuitry handles both rotational encoding and standard touch input, reducing the need for separate dedicated components.
Solution Approach 2:
The coupling electrodes serve as intermediaries between the rotatable interface components (conductor and patterned regions) and the input device electrodes. This intermediary layer simplifies the overall system architecture by providing a standardized interface that can accommodate different rotatable interface designs while maintaining compatibility with the base input device structure.
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 precise detection of rotational position and state of the rotatable interface, ensuring accurate user input in safety-critical environments like automobiles, while maintaining operational efficiency and safety by disabling standard sensing functionality.
Implementation Method 1
A rotatable interface with a conductor region and a patterned region is electrically coupled to specific electrodes of an input device, receiving a reference signal and generating a modified sensing signal
Data Source
AI summary
An electronic device incudes a rotatable interface configured to be placed on an input device, the rotatable interface including a conductor region and an adjacent patterned region. The rotatable device further includes a first set of coupling electrodes configured to be electrically coupled to the conductor region and to receive a reference signal from a first electrode of the input device, and a second set of coupling electrodes configured to be electrically coupled to the patterned region and to be electrically coupled to a second electrode of the input device, the second electrode configured to receive a resulting signal modified by the rotatable interface. In embodiments, at least a portion of each electrode of the first set of coupling electrodes and the second set of coupling electrodes is respectively provided underneath the conductor and patterned regions, and is configured to abut the input device.