Multi-channel Touch Panel Reducing RC Loading
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Solution Overview
Problem
Conventional capacitive touch panels suffer from high RC loading, which deforms sensing signals and results in poor performance, especially as the size of the touch device increases.
Innovation Solution
A multi-channel touch panel design featuring spatially arranged driving and sensing electrodes in a matrix configuration, where each sensing electrode is surrounded by a driving electrode, forming a sensing capacitor, and connected through insulated lines to reduce RC loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capacitive touch panels use patterned electrodes in a matrix configuration, then the touch sensing function is achieved, but the RC loading increases causing signal deformation and poor performance
Solution Approach 1:
The patent divides the conventional single-channel electrode structure into multiple independent channels. Each sensing electrode is associated with multiple driving electrodes across different channels, creating a multi-dimensional electrode matrix. This segmentation distributes the RC loading across multiple channels rather than concentrating it in a single channel, thereby reducing the overall RC loading effect and improving signal quality.
Solution Approach 2:
The patent transitions from a conventional two-dimensional electrode matrix to a three-dimensional multi-channel electrode configuration. By adding the channel dimension, each sensing electrode interacts with driving electrodes from multiple channels, creating a more distributed electrode network that reduces RC loading while maintaining touch sensing functionality.
2Area of stationary object
If the touch device size increases, then the coverage area is improved, but the sensing signal deformation worsens due to increased RC loading
Solution Approach 1:
The patent segments the large touch device area into multiple channels, each handling a portion of the overall sensing task. This segmentation allows the large area to be covered while distributing the RC loading effects across channels, preventing signal degradation that would otherwise occur in a single-channel large-area configuration.
Solution Approach 2:
By introducing the channel dimension, the patent enables large-area coverage without proportionally increasing RC loading in any single sensing path. The multi-channel architecture provides additional signal paths that compensate for the increased distance and capacitance associated with larger device areas.
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 design significantly reduces RC loading, ensuring that sensing signals remain undecayed and synchronous with driving signals, enhancing the touch panel's performance and accuracy.
Implementation Method 1
The capacitive-type touch sensing device can be classified into two types: an analog capacitive sensing device, which uses a contiguous resistive layer, and a projected capacitive sensing device, which uses patterned conductive layers (electrodes). In a projected capacitive touch device, the touch sensor employs a series of patterned electrodes that are driven with a signal from a controller. Similarly, a location of the contact point can be derived from currents flowing through one or more corresponding electrodes toward the touch point responsive to the touch with sensing the capacitance induced by a user's finger.
Implementation Method 2
A finger touch to the sensor provides a capacitive couple from the conductive layer to the body. The location of the contact point is detectable by a controller that measures a change in a capacitively coupled electrical signal at the touch location.
Data Source
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AI summary
The present invention relates to a multi-channel touch panel. In one embodiment, the multi-channel touch panel includes a plurality of driving electrodes spatial-separately arranged in the form of a matrix, a plurality of sensing electrodes associated with the plurality of driving electrodes such that each sensing electrode is surrounded by a corresponding driving electrode, N driving lines spatial-separately arranged along a row direction and M pairs of sensing lines spatial-separately arranged crossing over the N driving lines along a column direction, where each driving electrode in the row of the electrode matrix is electrically connected to each other by a corresponding driving line, and each odd sensing electrode in a column of the electrode matrix is electrically connected to each other by a first sensing line of the corresponding paired sensing lines, and each even sensing electrode in the column of the electrode matrix is electrically connected to each other by a second sensing line of the corresponding paired sensing lines.