Hybrid Mutual and Self-Capacitor Touch Detection Method
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Solution Overview
Problem
Conventional touch panel detection methods struggle with accurately detecting multi-point touches on larger touch panels without increasing scan frequency, leading to potential missed detections and increased complexity in calculation.
Innovation Solution
A hybrid touching detecting method that alternates between mutual-capacitor and self-capacitor detection to obtain position information of touch points, using driving channels and detecting channels to measure capacitance variations and switch between detection methods based on invalid ranges and touch point conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scan frequency is increased to improve multi-point touch detection accuracy, then detection precision is improved, but device complexity and processing burden increase
Solution Approach 1:
The touch panel is divided into multiple regions, and the detection process is segmented into mutual-capacitor detection and self-capacitor detection phases. This segmentation allows the system to handle multi-point touches more efficiently by processing different regions and touch types separately, reducing overall computational complexity while maintaining high detection accuracy.
Solution Approach 2:
The patent implements periodic alternating detection by switching between mutual-capacitor detection and self-capacitor detection in regular cycles. This periodic action enables the system to capture touch information from multiple detection modes over time, improving multi-point touch detection accuracy without requiring continuous high-frequency scanning that would increase processing burden.
2Measurement precision
If scan frequency is increased to detect multi-point touches on larger touch panels, then detection precision is improved, but processing time increases
Solution Approach 1:
By periodically alternating between mutual-capacitor and self-capacitor detection modes, the system efficiently gathers comprehensive touch information over time. This periodic approach allows accurate multi-point touch detection on large panels while managing processing time through structured, rhythmic detection cycles rather than continuous high-speed scanning.
Solution Approach 2:
The mutual-capacitor detection serves as a preliminary detection phase that identifies potential touch points before more detailed self-capacitor detection is performed. This preliminary action filters out non-touch events early, reducing the overall processing time required for comprehensive touch analysis on large panels.
3Device complexity
If conventional scanning method is used for touch detection, then device complexity is kept low, but detection reliability decreases due to missed detections
Solution Approach 1:
The patent merges mutual-capacitor detection and self-capacitor detection into a unified hybrid detection system. This combination leverages the strengths of both detection methods - mutual-capacitor for detecting touch presence and self-capacitor for confirming touch position - thereby improving detection reliability without significantly increasing device complexity.
Solution Approach 2:
The system implements feedback mechanisms where detection results from one phase inform the next detection phase. Mutual-capacitor detection results guide subsequent self-capacitor detection activities, creating a feedback loop that improves reliability by cross-validating touch events and reducing missed detections while maintaining manageable 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 method enhances the accuracy of touch point detection on touch panels by effectively handling multi-point touches and reducing the likelihood of missed detections, improving the overall effectiveness of the system.
Implementation Method 1
providing a driving signal sequentially and respectively to the plurality of driving channels, and obtaining a plurality of mutual-capacitor capacitance variations sequentially and respectively through the detecting channels
Data Source
AI summary
A touching apparatus and a touching detecting method thereof are provided. The touching detecting method is adapted for a touch panel. The touch panel has a plurality of touching rows and a plurality of touching columns. The touching detecting method includes: performing a mutual-capacitor touching detection and a self-capacitor touching detection alternatingly to the touch panel for obtaining a mutual-capacitor detection result and a self-capacitor detection result, respectively; and obtaining position information of at least one touch point on the touch panel by an operation based on the mutual-capacitor detection result and the self-capacitor detection result.