Capacitive Touch Panel Electrode Segmentation for Charging Time Reduction
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Solution Overview
Problem
Capacitive touch panels face increased resistance and charging time as the number of electrodes grows, leading to reduced speed and resolution, especially as panel size increases.
Innovation Solution
The solution involves placing all electrodes with lower resistance on the same substrate layer and utilizing self and mutual capacitances to determine touch locations, with a design that includes metal mesh structures and discrete insulation to optimize signal-to-noise ratio and reduce electrode resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of electrodes is increased to provide proper resolution, then the resolution is improved, but the resistance increases and charging time increases
Solution Approach 1:
The touch panel is divided into multiple segments or zones with electrode groups arranged in different patterns for different regions. This allows optimization of electrode density and resistance characteristics in specific areas without increasing the total number of electrodes across the entire panel, thereby maintaining resolution while managing charging time.
Solution Approach 2:
Different electrode configurations and densities are applied to different regions of the touch panel based on local requirements. High-resolution areas use denser electrode patterns, while other areas use sparser patterns to reduce overall resistance and charging time, achieving resolution improvement without uniform increase in electrode count.
2Measurement precision
If the number of electrodes is increased to provide proper resolution, then the resolution is improved, but the speed of the touch panel circuit is reduced
Solution Approach 1:
The circuit is segmented into multiple independent or semi-independent channels corresponding to different electrode groups. This segmentation allows parallel processing of touch detection signals from different regions, maintaining high circuit speed even with increased electrode count for improved resolution.
Solution Approach 2:
The electrode arrangement transitions from traditional orthogonal patterns to multi-dimensional or non-uniform patterns, allowing more electrodes to be effectively utilized without proportionally increasing the resistance and charging time that would slow down the circuit.
3Area of stationary object
If the size of the touch panel is increased, then the area is improved, but the resistance increases and charging time increases
Solution Approach 1:
Large touch panels are divided into multiple smaller electrode groups or zones that can be charged and detected independently. This segmentation reduces the effective charging distance and resistance for each group, allowing large panel area while maintaining acceptable charging times through parallel or sequential zone processing.
Solution Approach 2:
The electrode pattern design incorporates non-uniform distribution and multi-dimensional arrangements that optimize the resistance-to-area ratio, allowing larger panel areas to be covered without proportionally increasing the charging time through strategic electrode placement.
4Area of stationary object
If the size of the touch panel is increased, then the area is improved, but the speed of the touch panel is reduced
Solution Approach 1:
The touch panel processing is segmented into multiple independent detection channels corresponding to different regions or electrode groups. This allows parallel processing of touch events across different areas of the large panel, maintaining high response speed despite the increased area that would otherwise slow down sequential processing.
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 approach reduces charging time, maintains speed, and enhances visual performance by optimizing electrode placement and capacitance measurement, ensuring efficient touch detection across larger panel sizes.
Implementation Method 1
Multiple touch projective capacitive touch panels detect the change in current due to change in capacitance
Implementation Method 2
The charging time changes depending upon the number of electrodes and the resistance of the given line on a given axis
Data Source
AI summary
The present invention is a touch detection panel that uses capacitance changes between electrodes and changes thereof to determine a position of touch. The touch panel can be used in commercial applications where using a finger, stylus, or other object is the desired method of interface with an electronic system. The touch panel includes conductive electrodes and conductive lines connecting the conductive electrodes. The conductive electrodes themselves can be made of opaque conductive material, substantially transparent conductive material, or transparent conductive material depending on the requirements of an application. One such material is a metal mesh. The Touch panel is connected to a controller that applies current and/or voltage to the touch panel and senses current and/or voltage from the touch panel to determine either single or multiple touch locations.