Input Detection System Frequency Correction Circuit
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Solution Overview
Problem
Existing input detection systems face challenges in accurately controlling the drive frequency of detection drive signals due to temperature characteristics and variations in circuits, affecting the resonance frequency of input support devices and touch detection ICs.
Innovation Solution
An input detection system comprising drive electrodes, a drive signal supply circuit, a storage circuit with correction values, and an LC circuit-based input support device, where the drive signal is corrected using a correction value selection circuit to ensure proper resonance frequency alignment, even under temperature and circuit variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the drive frequency is controlled using fixed circuit parameters, then the resonance frequency alignment is achieved at initial state, but the frequency control becomes inaccurate due to temperature characteristics and circuit variations
Solution Approach 1:
The patent implements a feedback mechanism where the actual resonance frequency is detected and compared with the target frequency, and the difference is used to adjust the drive frequency. This closed-loop control ensures that temperature characteristics and circuit variations do not affect the frequency alignment accuracy.
Solution Approach 2:
The patent dynamically changes the drive frequency parameter based on detected resonance characteristics. By adjusting the frequency parameter in response to actual resonance conditions, the system maintains accurate frequency alignment despite environmental and circuit variations.
2Measurement precision
If the drive frequency is adjusted to compensate for frequency deviations, then the resonance alignment improves, but the system complexity increases due to additional correction circuits
Solution Approach 1:
The patent employs a self-service approach where the system automatically detects its own resonance frequency and performs self-correction without external intervention. The correction circuit uses the detected resonance information to automatically adjust the drive frequency, eliminating the need for complex manual calibration or external reference systems.
Solution Approach 2:
The patent replaces complex mechanical or hardware-based frequency adjustment mechanisms with electronic frequency synthesis and digital control. By using software-based frequency correction algorithms, the system achieves precise frequency alignment without requiring complex physical adjustment mechanisms.
3Reliability
If multiple frequency correction methods are implemented, then the frequency stability improves, but the detection time increases due to additional measurement and correction processes
Solution Approach 1:
The patent performs frequency detection and correction in advance during the initialization phase, before actual detection operations begin. By pre-calculating and storing corrected frequency values, the system ensures frequency stability without adding time delays during the actual detection process.
Solution Approach 2:
The patent implements periodic frequency verification and correction at appropriate intervals rather than continuously. This periodic approach maintains frequency stability while minimizing the time overhead associated with repeated measurement and correction operations.
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 system effectively corrects and stabilizes the drive frequency, enhancing the accuracy of input detection by aligning the resonance frequency with the drive frequency, thereby improving the detection of input support devices and touch events.
Implementation Method 1
a method has been known in 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 arrayed in a detection region, a drive signal supply circuit that supplies a drive signal to the drive electrodes, a storage circuit that stores therein a table having information about a correction value for a drive frequency of the drive signal, a correction value selection circuit that selects the correction value for the drive frequency on the basis of the table, 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.