Capacitance Detection Noise Determination via Signal Line Switching
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Solution Overview
Problem
Conventional electrostatic capacitive touch panel devices fail to effectively detect and remove external noise, particularly when its frequency is unknown or when the system fails to identify its presence.
Innovation Solution
An electrostatic capacitance value distribution detecting device that determines the presence of external noise by driving and switching signal lines to output electric charges, using multiple thresholds to identify noise across different detection regions and calculate a noise indicator to differentiate between noise and touch signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency-based noise removal methods are used, then external noise can be removed when its frequency is known, but the system cannot remove noise when the frequency is unknown or when noise presence is not detected
Solution Approach 1:
The patent performs preliminary actions by sequentially driving first signal lines and then second signal lines before final touch detection, allowing the system to detect noise patterns in advance and determine whether external noise is present before attempting noise removal
Solution Approach 2:
The patent implements feedback mechanisms by comparing detection results from multiple driving sequences and using noise determination sections to identify whether external noise is present, then adjusting the noise removal process based on these detection results
2Measurement precision
If conventional noise removal systems are implemented, then the system structure remains simple, but the system fails to accurately detect external noise and appropriately remove it
Solution Approach 1:
The patent segments the noise detection process into multiple independent steps: driving first signal lines, driving second signal lines, comparing detection results, and determining noise presence, allowing each segment to be optimized independently while maintaining overall system manageability
Solution Approach 2:
The patent employs dynamic switching between different driving sequences and adapts the noise removal process based on real-time detection results, making the system flexible and responsive to varying noise conditions without requiring a completely complex fixed architecture
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
Enables accurate detection and potential removal of external noise, improving the reliability of touch panel operations by distinguishing noise from legitimate touch signals through a systematic analysis of signal intensity distributions.
Implementation Method 1
detecting distribution of values of a plurality of electrostatic capacitances that are formed at respective intersections where a plurality of first signal lines intersect a plurality of second signal lines
Data Source
AI summary
Realized is an electrostatic capacitance value distribution detecting device capable of determining whether or not external noise exists. An electrostatic capacitance value distribution detecting circuit (2) of an aspect of the present invention drives vertical signal lines (VL) to output, from horizontal signal lines (HL), electric charges corresponding to electrostatic capacitances, and then drives the horizontal signal lines to output, from the vertical signal lines, electric charges corresponding to the electrostatic capacitances. The electrostatic capacitance value distribution detecting device includes a noise detecting section (8) which determines whether or not external noise exists.