Capacitive Touch Panel Floating Mode Detection
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Solution Overview
Problem
Capacitive touch panels operating in floating mode experience irregular capacitance variations, leading to incorrect determination of touch object coordinates due to ungrounded nature, resulting in increased error rates in identifying touch objects.
Innovation Solution
A method involving a detection window scan of sensing clusters, where central sensing points with negative values and other points with normal distribution values are counted to determine if a sensing cluster is generated under floating mode, using critical values to differentiate between grounding and floating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitive touch panel operates under floating mode, then the touch panel can function without grounding connection, but irregular capacitance variations occur leading to incorrect coordinate determination
Solution Approach 1:
The patent applies preliminary action by detecting and identifying floating mode sensing clusters before coordinate determination is performed. The system scans the sensing cluster, identifies negative peak values characteristic of floating mode, and flags these clusters for special handling. This preliminary detection allows the system to prepare appropriate compensation measures before the harmful effect of incorrect coordinate determination can occur.
Solution Approach 2:
The patent converts the harmful irregular capacitance variations of floating mode into a beneficial detection feature. By recognizing that floating mode produces distinctive negative peak values in sensing clusters, the system uses these previously harmful variations as identification markers. The negative peaks that caused measurement errors are now utilized to trigger floating mode detection and compensation, transforming the problem into a solution.
2Measurement precision
If grounding connection is established to eliminate floating mode effects, then coordinate determination accuracy improves, but the touch panel loses flexibility in ungrounded operation scenarios
Solution Approach 1:
The patent applies dynamics by making the touch panel's operational mode adaptive rather than fixed. The system dynamically switches between grounding mode and floating mode operation based on real-time detection of sensing cluster characteristics. By monitoring for negative peak values and identifying floating mode conditions, the system adjusts its coordinate determination algorithm accordingly, allowing the touch panel to operate accurately in both grounded and ungrounded scenarios without requiring a permanent grounding connection.
3Productivity
If direct coordinate determination is performed on sensing clusters under floating mode, then processing speed is maintained, but error rate in identifying touch objects increases
Solution Approach 1:
The patent applies preliminary action by implementing a scanning and identification step before coordinate determination. The system scans the sensing cluster to detect negative peak values that indicate floating mode, identifies the affected clusters, and prepares compensation measures. This preliminary detection phase is designed to be computationally efficient, allowing the system to maintain high processing speeds while ensuring accurate identification of floating mode clusters before they can cause coordinate determination errors.
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
Correctly identifies sensing clusters under floating mode, enabling accurate compensation and precise determination of touch object coordinates, reducing error rates in capacitive touch panel operations.
Implementation Method 1
a capacitive touch panel is an approach detecting positions touched by users according to capacitance variations changed by static electricity on human body
Implementation Method 2
capacitance variations changed by static electricity on human body
Data Source
AI summary
A method of detecting floating mode of a touch panel has steps of reading a sensing cluster and presetting a detection window; taking each sensing point of the sensing cluster as a center point of the detection window; after determining that the center point has a negative sensing value qualifying to be generated under a floating mode, further determining a count of the sensing points other than the center point having the sensing values generated under a grounding mode and incrementing an accumulative number by one if the count exceeds a first critical value; keeping incrementing the accumulative number until each sensing point in the sensing cluster has been taken as the center point of the detection window for scanning; and determining if the accumulative number exceeds a second critical value, and if positive, further determining that the current sensing cluster is generated under the floating mode.