Touch Panel Signal Detection Using Non-Integer Period Ratios
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Solution Overview
Problem
Touch sensitive processing apparatuses struggle to accurately detect electrical signals from styluses while preventing electromagnetic interference, requiring synchronization with signal transmission timing.
Innovation Solution
The apparatus detects periodic touch events and electrical signals using a sensing circuit module and processor module, calculating the signal transmission period to differentiate between true signals and interference by ensuring one detection period is not an integer multiple of the transmission period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensitive processing apparatus synchronizes with the transmitting timing of electrical signals to demodulate them, then the measurement precision of electrical signals is improved, but the device complexity increases due to synchronization requirements
Solution Approach 1:
The transmitter performs self-detection by monitoring its own transmitted signals through the touch panel electrodes. The processor detects the period of transmitted signals and uses this information to synchronize detection timing automatically, eliminating the need for separate synchronization mechanisms between transmitter and receiver
Solution Approach 2:
The system implements feedback by detecting the period of transmitted signals and using this detected period to adjust and synchronize the detection timing. The processor continuously monitors signal periods and adapts detection timing accordingly, creating a closed-loop synchronization system that improves measurement precision without adding complex external synchronization hardware
2Productivity
If the apparatus performs continuous electrical signal detection, then the productivity of signal detection is improved, but the reliability decreases due to mistaking electromagnetic interferences as genuine signals
Solution Approach 1:
The system performs electrical signal detection periodically based on the detected period of transmitted signals. Instead of continuous detection, the processor schedules detection events at regular intervals matching the signal transmission period, which maintains high detection productivity while reducing false positives from electromagnetic interference by only sampling at expected signal arrival times
Solution Approach 2:
The apparatus preliminarily detects the period of transmitted signals before performing regular electrical signal detection. This preliminary detection phase allows the system to establish the correct detection timing and period, ensuring that subsequent periodic detection operations are synchronized and reliable, preventing mistaking of electromagnetic interferences
3Ease of operation
If the detection period is set as an integer multiple of the transmission period for synchronization, then the ease of operation is improved, but the measurement precision deteriorates due to inability to distinguish signals from interference
Solution Approach 1:
The system intentionally creates asymmetry between the detection period and transmission period by setting the detection period as a non-integer multiple of the transmission period. This asymmetric relationship ensures that detection events do not consistently coincide with electromagnetic interference patterns, allowing the system to distinguish genuine signals from interference through pattern recognition over multiple detection cycles
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 method enables efficient detection and processing of stylus signals, reducing mistaking electromagnetic interferences as genuine signals and improving signal detection accuracy.
Implementation Method 1
a sensing circuit module configured to sense electrical signals via first electrodes in parallel to a first axis and second electrodes in parallel to a second axis of a touch panel, wherein the electrical signals are emitted by an electrode of a transmitter touching or approximating the touch panel
Data Source
AI summary
A method for detecting electrical signals is provided. The method comprising: detecting periodically via a touch panel touching or approximating events and electrical signals according to a first period, wherein the electrical signals are emitted by an electrode of a transmitter touching or approximating the touch panel; performing multiple electrical signal detections during an electrical signal scanning period, after the electrical signals are detected in a first time, in order to detect the electrical signals in a second time; calculating a period of the electrical signal transmission of the transmitter according to the first time and the second time; and detecting periodically via the touch panel touching or approximating events and electrical signals according to the period of the electrical signal transmission, wherein one of the first period and the period of the electrical signal transmission is not an integer multiple of another of the first period and the period of the electrical signal transmission.