Input Detection System Using LC Resonance for Touch Panel
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Solution Overview
Problem
Existing input support devices for touch panels require complex detection methods using multiple electrodes to differentiate between input support devices and other objects, such as fingers, complicating the detection process.
Innovation Solution
An input detection system featuring a plurality of detection electrodes and an input support device with an LC circuit, where a first electrode is coupled to one end of the LC circuit and a second electrode to the other end, with a reference potential supplied to detection electrodes overlapping with the first electrode and a detection drive signal supplied to those overlapping with the second electrode, utilizing LC resonance for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple electrodes or multiple detection methods are used to determine whether a detection target is an input support device or another object, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by utilizing the resonant frequency characteristics of the LC circuit in the input support device. Instead of using multiple electrodes or detection methods, the system detects the specific resonant frequency signal (around 27 MHz) emitted by the LC circuit when excited by a detection signal. This frequency-based parameter differentiation allows accurate identification of the input support device versus other objects using a single electrode structure, thereby resolving the contradiction between detection accuracy and device complexity
Solution Approach 2:
The patent replaces the mechanical/electrical complexity of multiple electrode arrangements with an electromagnetic field-based detection approach. By transmitting a detection signal through the touch panel and detecting the resonant frequency response from the LC circuit, the system substitutes complex physical electrode configurations with a simpler electromagnetic resonance detection mechanism, achieving accurate identification without increasing device complexity
2Difficulty of detecting and measuring
If three or more electrodes are used for detection, then detection capability is improved, but the detection system becomes more complicated
Solution Approach 1:
The patent resolves this contradiction by changing the detection parameter from spatial electrode arrangement to frequency domain analysis. Instead of using three or more electrodes to detect different spatial positions, the system uses a single electrode configuration that detects the resonant frequency parameter. The LC circuit's unique frequency signature (approximately 27 MHz) allows the system to identify the input support device with high capability while maintaining simple electrode hardware
Solution Approach 2:
The patent introduces an intermediary detection signal that mediates between the touch panel and the input support device. The detection signal transmitted through the touch panel acts as an intermediary that excites the LC circuit and carries information about the input support device's presence and state. This intermediary signal approach enables effective detection without requiring complex multi-electrode configurations
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 approach simplifies the detection of input support devices by leveraging LC resonance to distinguish them from other objects, enhancing detection accuracy and reducing system complexity.
Implementation Method 1
an input support device that includes an LC circuit... utilizing LC resonance for detection
Data Source
AI summary
An input detection system includes a plurality of detection electrodes arrayed in a detection region, and an input support device that includes an LC circuit, a first electrode coupled to one end side of the LC circuit, and a second electrode coupled to the other end side of the LC circuit. The input support device is disposed to overlap with some of the detection electrodes, a reference potential is supplied to the detection electrode overlapping with the first electrode, and a detection drive signal is supplied to the detection electrode overlapping with the second electrode.