Self Capacitive Touch Screen Weight Pressure Filtering
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Solution Overview
Problem
Self capacitive touch screens inaccurately identify touch points due to deformation caused by pressure, leading to false touch points and reduced user experience, as prior art neglects the influence of self capacitor changes on identification results.
Innovation Solution
A weight pressure process method and system that detects changes in induction capacitors relative to self capacitors, calculates a threshold relationship using touch thresholds and minor changes in adjacent channels, and filters out fake points by identifying changes not exceeding this threshold, thereby improving touch point accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure is applied to the touch screen, then the distance between the conductive electrode and ground is reduced, but the self capacitor changes causing false touch points
Solution Approach 1:
The patent performs preliminary detection of self capacitor changes before touch point identification. By detecting the change amount of the self capacitor in advance and using it to dynamically adjust the determination threshold, the system prepares for potential pressure-induced false points before they occur, preventing inaccurate identification rather than correcting it afterward
Solution Approach 2:
The patent dynamically changes the determination threshold parameter based on the detected self capacitor change amount. When pressure causes self capacitor changes exceeding a preset threshold, the system adjusts the touch point determination threshold accordingly, allowing the threshold to adapt to different pressure conditions and maintain accurate touch point identification
2Ease of operation
If a fixed touch threshold is used, then the system is simple to operate, but pressure-induced self capacitor changes cause false positive touch points
Solution Approach 1:
The patent transforms the static touch threshold into a dynamic parameter that automatically adjusts based on real-time self capacitor changes. The threshold is no longer fixed but varies with pressure conditions, enabling the system to maintain high measurement precision across different operating conditions without requiring manual recalibration
Solution Approach 2:
The patent implements a feedback mechanism where the detected self capacitor change amount is fed back to adjust the determination threshold. This closed-loop control ensures that the threshold continuously adapts to current pressure conditions, preventing false positive touch points while maintaining operational simplicity
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 method accurately identifies actual touch points, ensures correct touch applications, and significantly enhances user experience by filtering out false points and compensating for pressure-induced deformations.
Implementation Method 1
the conductive electrode form a self capacitor Cp between the conductive electrode and ground
Implementation Method 2
capacitive induction chip gathering the induction capacitor of each channel on real-time
Data Source
AI summary
The present invention relates to touch screen technology, and provide a weight pressure process method and system of the self capacitive touch screen. In the weight pressure process method and system of the self capacitive touch screen provided by the invention, a threshold relationship is used to modify the existing touch threshold, the threshold relationship uses the touch threshold and the minor change of the changes of two channels adjacent to the channel corresponding to the maximum value as variables, if the maximum value is not greater than the value of the threshold relationship, identify the point causing the current change as a fake point and filter out the fake point. In the method, the change of the self capacitor caused by the deformation due to pressure, so the actual touch point can be identified more accurately, a touch application can be performed correctly, and the user experience is improved greatly.