Capacitive Knob-on-Display Rotation Detection for Interchangeable Knobs
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Solution Overview
Problem
Existing Knob on Display (KoD) systems require resetting the rotation angle detection setting when replacing knobs with different rotation angles, limiting customizability and convenience.
Innovation Solution
An input device with a capacitance-type touch sensor and an operating element featuring a conductor and capacitance changing parts, allowing automatic detection of the rotation angle without changing the detection setting, by utilizing changes in capacitance to determine the rotation angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the rotation angle detection setting is changed to adapt to different knobs, then the detection accuracy for specific knob types is improved, but the device complexity and operation burden increase due to requiring manual reconfiguration
Solution Approach 1:
The detection unit automatically detects the knob type and configures the rotation angle detection setting without user intervention. The system self-adapts by identifying the specific knob model and autonomously adjusting the detection parameters, eliminating the need for manual reconfiguration while maintaining high detection accuracy.
Solution Approach 2:
The detection unit dynamically changes the rotation angle detection parameters based on the detected knob type. Different knob models have different rotation angles per step, and the system automatically adjusts these parameters to match the specific knob being used, enabling accurate detection across various knob types without fixed configuration.
2Ease of operation
If the rotation angle per step is fixed in the detection algorithm, then the detection process is simplified, but the adaptability to different knob types is reduced
Solution Approach 1:
The detection algorithm transitions from a static fixed rotation angle to a dynamic adaptive rotation angle. The system initially uses a default detection algorithm, then automatically identifies the knob type and adjusts the rotation angle parameter accordingly, combining simplicity with adaptability through dynamic parameter adjustment.
Solution Approach 2:
The detection unit is designed to universally support multiple knob types by incorporating automatic knob type identification functionality. A single detection algorithm serves multiple purposes: it detects the knob type first, then configures the appropriate rotation angle for that specific type, making the system versatile without requiring multiple specialized algorithms.
3Measurement precision
If manual reconfiguration is required for each knob replacement, then the detection precision for the specific knob is ensured, but the time loss and operational burden increase
Solution Approach 1:
The system performs preliminary automatic detection of the knob type immediately upon knob attachment, before any user operation. By pre-identifying the knob model and pre-configuring the detection parameters automatically, the system eliminates the time-consuming manual reconfiguration process while ensuring precise detection from the start.
Solution Approach 2:
The detection unit continuously monitors the knob's electrical characteristics and rotation behavior to provide feedback on the detected knob type. Based on this feedback, the system automatically adjusts the rotation angle detection settings in real-time, ensuring precision without requiring user intervention during the configuration process.
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 seamless adaptation to various knobs with different rotation angles, enhancing customizability and convenience by eliminating the need for repeated setting adjustments.
Implementation Method 1
a capacitance change amount detection unit configured to detect a change in capacitance in the capacitance changing parts
Data Source
AI summary
A knob of a KoD includes a fixed part attached to a touch sensor or a cover glass via an adhesive, a rotating part rotatably attached to the fixed part via a rotating shaft, and a conductor provided inside the rotating part. Low-permittivity members corresponding in number to the number of steps are provided at equal intervals on a bottom surface of the fixed part. When the knob is rotated, the rotation angle of the knob is detected based on a change in the capacitance caused by a low-permittivity member.