Touch Screen Stylus Positioning via Dynamic Sensing Parameters
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Solution Overview
Problem
Touch sensitive systems face challenges in accurately detecting the position of a stylus due to weak electrical signals and noise interference, leading to errors in signal-to-noise ratio (SNR) and misinterpretation of messages.
Innovation Solution
A touch sensitive processing apparatus that adjusts sensing parameters based on the distance of the circuit path for the electrical signal, optimizing parameters such as integral duration, gain coefficient, and sampling number to improve signal quality and reduce errors in coordinate calculation and message transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the stylus emits a weak electrical signal or is positioned far from the touch sensitive screen, then the signal strength decreases, but the signal-to-noise ratio deteriorates and positioning accuracy reduces
Solution Approach 1:
The sensing parameter is dynamically adjusted based on the detected position of the stylus. The processing apparatus modifies parameters such as integral duration, gain coefficient, and sampling number according to the circuit path length, allowing the system to adapt to varying signal strengths and maintain optimal positioning accuracy across different locations on the touch sensitive screen
Solution Approach 2:
The patent changes physical or operational parameters of the sensing system to compensate for signal degradation. By adjusting the sensing parameter (integral duration, gain coefficient, sampling number) based on the stylus position and circuit path length, the system compensates for weak signals and maintains reliable detection across the entire screen area
2Measurement precision
If the stylus position is closer to the left side of the touch sensitive screen, then the circuit path length increases, but the electrical signal is more easily disturbed by noise
Solution Approach 1:
The system uses feedback from position detection to adjust sensing parameters. The processing apparatus detects the stylus position, calculates the corresponding circuit path length, and uses this information to feedback-adjust the sensing parameter, creating a closed-loop system that continuously optimizes signal detection based on actual operating conditions
Solution Approach 2:
The sensing parameter is made dynamic rather than fixed, changing in real-time based on the stylus position. This dynamic adjustment allows the system to compensate for increased noise interference in longer circuit paths by strengthening the signal processing parameters accordingly
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
Enhances the signal-to-noise ratio of detected electrical signals, reducing positioning errors and message misinterpretation, thereby improving the accuracy of stylus detection and communication.
Implementation Method 1
The stylus 120 may emit electrical signal actively and may also emit electrical signal in responsive to a triggering condition. The touch sensitive processing apparatus 130 may detect the electrical signal by the first and the second electrodes 111 and 112 to determine a position of the stylus 120 on the touch sensitive screen 110.
Data Source
AI summary
The present invention provides a touch sensitive processing method including: having a sensing circuit of a touch sensitive processing apparatus sense an electrical signal emitted from a transmitter via multiple first electrodes according to a first sensing parameter to generate multiple first sensing results and sense the electrical signal via multiple second electrodes according to a second sensing parameter to generate multiple second sensing results; calculating a second coordinate value of the transmitter with respect to a second axis according to the first sensing results; calculating a first coordinate value of the transmitter with respect to a first axis according to the second sensing results; setting the second sensing parameter according to the second coordinate value; and setting the first sensing parameter according to the first coordinate value.