Knob-Type Touch Display for Accurate Capacitive Gear Detection
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Solution Overview
Problem
Existing touch display devices with knobs suffer from inaccuracies in determining the gear of the knob, leading to errors in function adjustment due to incorrect gear identification, which is exacerbated by environmental factors and noise interference.
Innovation Solution
A knob-type touch display device with a detection unit that transmits distinct detection signals to touch electrodes overlapping contact electrodes, allowing for capacitive sensing to accurately determine the knob's state and gear through capacitive sensing signals, ensuring proper installation and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional touch detection methods are used for knob gear identification, then the device structure remains simple, but the gear determination accuracy deteriorates due to environmental factors and noise interference
Solution Approach 1:
The detection process is divided into two distinct phases: a self-detection phase where detection signals are sent to touch electrodes to identify contact electrode states, and a normal detection phase for regular touch operations. This segmentation allows accurate gear identification while maintaining system simplicity for常规 operations.
Solution Approach 2:
A self-detection phase is performed before normal touch detection to preliminarily identify the knob's gear position. By detecting the state of contact electrodes in advance, the system establishes accurate gear information that guides subsequent touch detection operations, preventing errors from propagating.
Solution Approach 3:
The system uses capacitive sensing signals from touch electrodes to provide feedback about contact electrode states. This feedback mechanism allows the detection unit to determine the knob's current gear position accurately by analyzing the capacitive coupling changes between touch electrodes and contact electrodes.
2Ease of operation
If manual knob rotation is used for function adjustment, then the operation is simple and direct, but gear determination errors occur affecting normal application
Solution Approach 1:
The patent replaces purely mechanical gear indication with an electronic detection system using capacitive sensing. Instead of relying on mechanical position indicators that may be inaccurate, the system uses electrical fields and capacitive coupling between touch electrodes and contact electrodes to electronically determine gear position, significantly improving reliability while maintaining mechanical knob operation.
Solution Approach 2:
Capacitive coupling acts as an intermediary between the mechanical knob rotation and the electronic detection system. The capacitive sensing signals transmitted through the touch electrodes provide a reliable intermediate measurement mechanism that accurately reflects the mechanical position without direct mechanical contact, improving reliability.
3Measurement precision
If single detection signal is used for touch electrode stimulation, then the detection process is simple, but the detection precision deteriorates due to environmental interference
Solution Approach 1:
The detection system uses periodic detection signals sent to touch electrodes during the self-detection phase. By transmitting detection signals in a periodic manner and analyzing the resulting capacitive sensing signals, the system can distinguish genuine gear position information from environmental noise and interference, improving measurement precision.
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 solution enables precise detection of the knob's state and gear, improving the reliability and accuracy of knob operation by minimizing errors and environmental interference.
Implementation Method 1
when the contact electrode is bonded to the touch display panel, the contact electrode and the touch electrode overlapping the contact electrode form capacitance
Data Source
AI summary
Provided are a knob-type touch display device and a detection method therefor. The display device includes a touch display panel including multiple touch electrodes; a knob including multiple contact electrodes, where along a direction perpendicular to a plane where the touch display panel is located, a contact electrode overlaps a touch electrode; and a detection unit electrically connected to the touch electrode. In a self-detection phase, the detection unit is configured to transmit a first detection signal to the touch electrode overlapping any one of the contact electrodes and transmit a second detection signal to the touch electrode overlapping a remaining contact electrode; and the detection unit is further configured to acquire a capacitive sensing signal generated by the touch electrode in response to the first detection signal or the second detection signal and determine a current state of the knob according to the capacitive sensing signal.