Metal Mesh Touch Electrode Ghost Touch Prevention
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Solution Overview
Problem
Capacitive touchscreen panels face interference issues between metal mesh electrodes and trace wires, leading to ghost touches due to similar electrode patterns, which are not suitable for flexible and large displays.
Innovation Solution
A touchscreen device with a metal mesh electrode pattern featuring a lattice structure on both active and edge areas, where the electrode patterns intersect and include disconnection parts on the edge area to minimize interference, allowing precise touch recognition without ghost touches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If metal mesh electrodes are used to replace ITO electrodes, then flexibility and large display implementation are improved, but interference between metal mesh electrodes and trace wires causes ghost touches
Solution Approach 1:
The metal mesh electrode pattern is divided into multiple independent mesh patterns arranged in different layers. Each mesh pattern is segmented into discrete lattice structures that can be independently positioned and configured, allowing optimization of each layer to reduce interference while maintaining overall electrode functionality.
Solution Approach 2:
The solution transitions from a single-layer electrode pattern to a multi-layer three-dimensional electrode structure. By stacking multiple mesh patterns at different heights and orientations, the design utilizes the vertical dimension to separate interfering elements, reducing coupling capacitance between trace wires and electrodes while maintaining touch sensitivity.
2Measurement precision
If metal mesh electrode pattern with lattice structure is used, then touch recognition precision is improved, but coupling capacitance between metal mesh electrodes and trace wires increases
Solution Approach 1:
The mesh patterns in different layers are designed with asymmetric orientations and varying lattice densities. By creating asymmetric electrode configurations, the design optimizes the distribution of electric field lines, concentrating them in regions that enhance touch detection while minimizing coupling with trace wires in adjacent regions.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between the metal mesh electrode patterns and the trace wires. These intermediary dielectric layers reduce the direct coupling capacitance between conductive elements while maintaining the electrical field necessary for touch sensing, thereby reducing ghost touches.
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 solution effectively reduces coupling capacitance between the metal mesh electrodes and trace wires, preventing ghost touches while maintaining accurate touch recognition, especially in flexible and large display applications.
Implementation Method 1
A capacitive touchscreen panel typically includes a driving electrode and a sensing electrode formed on separate layers, which operates to measure the change in electrical field formed between the two electrodes when an object (for example, user's hand) touches the touchscreen
Data Source
AI summary
The disclosure relates to an electronic device comprising a metal mesh touch electrode. The electronic device may include: a display panel comprising an active area in which data is displayed, and an edge area formed along the outer peripheral surface of the active area; a substrate positioned on the display panel, the substrate comprising a first area corresponding to the active area and a second area corresponding to the edge area; a metal mesh electrode pattern formed in the first area and the second area; and multiple trace wires positioned on the substrate and electrically connected to the metal mesh electrode pattern. The metal mesh electrode pattern may comprise a first electrode pattern having a lattice structure, and a second electrode pattern having a lattice structure, the second electrode pattern being positioned on top of the first electrode pattern and disposed so as to crisscross the first electrode pattern. A single-wired portion may be formed in at least a partial area of the metal mesh electrode pattern formed in the second area.