Capacitive Touch Panel Resonance Circuit Position Detection
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Solution Overview
Problem
Current sensor devices face challenges in accurately detecting user operations on touch panels due to errors in detecting the positions of conductors within the input device, particularly when operated by non-conductive materials like fingers, leading to reduced detection values and potential misinterpretation of touch events.
Innovation Solution
Incorporating a resonance circuit with a first and second conductor covered by a non-conductor within the input device, which are capacitively coupled to the touch panel electrodes, allowing the sensor controller to detect their positions by applying a voltage based on the resonance frequency, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional touch panel detection method is used, then the touch panel can detect contact or proximity of objects, but the detection accuracy is reduced when an input device with conductors is disposed on the touch panel
Solution Approach 1:
The patent applies resonance vibration to the conductors within the input device. By detecting the resonance frequency of the conductors when they are excited, the system can accurately determine the position and state of the input device on the touch panel, thereby improving detection accuracy while maintaining a relatively simple device structure.
Solution Approach 2:
The patent changes the detection parameter from simple capacitive coupling to resonance frequency detection. By measuring the resonance frequency of the conductors in the input device, the system can distinguish between the input device and other objects on the touch panel, improving measurement precision without significantly increasing device complexity.
2Reliability
If the position of conductors in the input device is detected, then user operation can be recognized, but error detection occurs leading to reduced detection values
Solution Approach 1:
The patent uses resonance vibration characteristics of the conductors to improve position detection accuracy. By detecting the resonance frequency and using it to calculate the position of the conductors, the system achieves more reliable and accurate detection, reducing error detection and improving overall detection reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the detected resonance frequency is used to calculate conductor positions, and this information is fed back to improve subsequent detections. The system uses the resonance characteristics to continuously refine position detection, thereby improving both reliability and precision.
3Measurement precision
If the resonance frequency of the resonance circuit is used for detection, then detection values increase and error detection is reduced, but the device complexity increases
Solution Approach 1:
The patent makes the touch panel electrodes serve multiple functions: they act as both the touch detection electrodes and the excitation source for the resonance circuit. This multi-functionality allows the system to use resonance frequency detection without adding separate excitation electrodes, thereby improving detection accuracy while minimizing the increase in device complexity.
Solution Approach 2:
The conductors in the input device serve as both the resonating elements and the detection targets. The system uses the inherent electrical properties of these conductors to generate and detect resonance, eliminating the need for separate sensing mechanisms and reducing overall device complexity while 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
This configuration increases detection values and reduces error detection, enabling precise user operation recognition on touch panels, even when operated by non-conductive materials, by leveraging the resonance circuit's potential changes.
Implementation Method 1
a resonance circuit including a first conductor and a second conductor is covered with a non-conductor... based on a resonance frequency of the resonance circuit
Implementation Method 2
The first conductor and the second conductor are capacitively coupled to at least one of a plurality of electrodes in the touch panel
Data Source
AI summary
A sensor device includes a capacitive touch panel including a plurality of electrodes, an input device configured such that a resonance circuit including a first conductor and a second conductor is covered with a non-conductor, and a sensor controller. The first conductor and the second conductor are capacitively coupled to at least one of a plurality of electrodes in the touch panel when the input device is disposed on the touch panel or when the input device disposed on the touch panel is operated. The sensor controller is configured to detect positions of the first conductor and the second conductor on the touch panel by applying a voltage to the plurality of electrodes in the touch panel based on a resonance frequency of the resonance circuit.