Multi-Layer Ground Wire Structure for Touch Panel Electrostatic Shielding
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Solution Overview
Problem
Touch panels are susceptible to electrostatic interference and accumulation, leading to poor touch sensing and increased defectiveness due to the lack of effective electrostatic shielding in existing designs, particularly in large-size panels.
Innovation Solution
Incorporating a first and second ground wire layer electrically connected through ground wire vias in the insulating layer, which serves as an electrostatic shielding for the electrode layers, preventing external charge interference and conducting static electricity away from the sensing electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-layer ground wire design is used, then manufacturing process is simple, but electrostatic shielding effectiveness is insufficient
Solution Approach 1:
The ground wire structure is segmented into multiple layers (first ground wire layer and second ground wire layer) positioned at different heights above the substrate. This segmentation creates a multi-level electrostatic shielding system that more effectively blocks external electric fields compared to a single-layer design, while maintaining manufacturing feasibility through standardized layering processes.
Solution Approach 2:
The ground wire structure transitions from a two-dimensional planar layout to a three-dimensional multi-layer configuration. By adding the vertical dimension with multiple ground wire layers at different heights, the electrostatic shielding coverage is enhanced without significantly complicating the manufacturing process, as the additional layer can be integrated into existing multi-layer PCB fabrication techniques.
2Reliability
If ground wire layers are added for electrostatic shielding, then touch sensing performance improves, but manufacturing complexity increases
Solution Approach 1:
The first and second ground wire layers are merged with existing signal transmission line structures to form an integrated multi-layer ground wire system. This merging approach allows the electrostatic shielding function to be achieved by utilizing and coordinating existing structural elements rather than adding completely separate components, thereby improving touch sensing performance while minimizing increases in manufacturing complexity.
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 solution effectively shields the electrode layers from external charges, preventing electrostatic interference and accumulation, thereby improving touch sensing performance and reducing defectiveness in touch panels.
Implementation Method 1
a first ground wire layer and a second ground wire layer which serve as an electrostatic shielding for the electrode layers
Implementation Method 2
The first ground wire layer and the second ground wire layer are electrically connected in parallel to a plurality of grounding terminals
Data Source
AI summary
A touch panel, a display device and a manufacturing method of the touch panel are provided, including: a display area and a peripheral area including a bonding area; a first electrode layer and a second electrode layer configured to sense touch and an insulating layer provided between the first electrode layer and the second electrode layer; a first ground wire layer provided in the bonding area on the substrate, the insulating layer including an opening provided on the first ground wire layer, the opening exposing a part of the first ground wire layer; and a second ground wire layer provided on the first insulating layer and the exposed part of the first ground wire layer. The exposed part of the first ground wire layer and the second ground wire layer contact each other in the opening of the insulating layer in the bonding area.