Input Detection System Using LC Circuit Resonance for Position and Orientation
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Solution Overview
Problem
Existing input detection systems face challenges in accurately detecting various pieces of information, such as position and rotation angle, of input support devices with high precision, particularly in touch panel systems using electrostatic capacitance methods.
Innovation Solution
The system employs a configuration of drive electrodes and detection electrodes in a detection region, coupled with an LC circuit and a control circuit that supplies reference and drive signals to detect the input support device based on capacitance changes, forming a two-dimensional distribution of signal values to identify positive and negative polarity regions, enabling precise detection of the input support device's position and rotation angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If resonance detection method is used to detect input support device, then position information can be detected, but detection accuracy of various information (rotation angle, shape) is insufficient
Solution Approach 1:
The detection electrodes are divided into multiple segments arranged in a specific pattern, allowing independent detection of different capacitance changes. This segmentation enables the system to detect multiple parameters (position, rotation angle, shape) simultaneously with high precision by analyzing the response of each electrode segment, thereby improving measurement precision without requiring a completely new detection system.
Solution Approach 2:
The patent introduces a two-dimensional arrangement of detection electrodes to detect not only position but also rotation angle and shape information. By adding spatial dimensionality to the electrode configuration, the system can extract multiple pieces of information from the same detection region, improving detection accuracy of various parameters without significantly increasing system complexity.
2Measurement precision
If multiple pieces of information (position, rotation angle, shape) are detected, then input operation accuracy is improved, but detection system complexity increases
Solution Approach 1:
The detection electrode system is designed to perform multiple functions simultaneously: detecting position, rotation angle, and shape of the input support device. By making the detection system universal and multi-functional, the patent improves input operation accuracy without requiring separate detection systems for each parameter, thereby limiting the increase in system complexity.
Solution Approach 2:
The patent uses capacitance change as an intermediary parameter to detect multiple physical quantities. The detection electrodes measure capacitance variations caused by the input support device, and through signal processing, these capacitance changes are converted into position, rotation angle, and shape information. This intermediary approach allows multi-parameter detection with a unified detection mechanism, improving accuracy while controlling system complexity.
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 allows for accurate detection of the input support device's position and rotation angle with high precision, improving the overall accuracy and reliability of input operations in touch panel systems.
Implementation Method 1
each of the first electrode and the second electrode forms capacitance with the facing detection electrode based on the reference potential or the drive signal
Implementation Method 2
a method with which the input support device is detected using resonance of a resonance circuit provided in the input support device
Data Source
AI summary
An input detection system includes a plurality of drive electrodes and a plurality of detection electrodes aligned in a detection region, an input device including an LC circuit, a first electrode coupled to one end side of the LC circuit, and a second electrode coupled to another end side of the LC circuit, the input support device being disposed on the detection region, and a control circuit configured to detect the input support device based on detection signals that are output from the detection electrodes.