Touch Panel Ground Wire Vias 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, where inductive electrostatic charges can cause short circuits and affect the light blocking structures.
Innovation Solution
Incorporating a first and second ground wire, electrically connected through ground wire vias in the insulating layer, which serves as an electrostatic shield for the electrode layers, preventing external charge interference and conducting static electricity away from the sensing electrodes to prevent accumulation and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional touch panel structure without ground wires is used, then device complexity is reduced, but electrostatic shielding capability deteriorates leading to poor touch sensing and increased defectiveness
Solution Approach 1:
The grounding system is segmented into multiple ground wires (first ground wire and second ground wire) positioned at different locations within the touch panel structure. This segmentation allows effective electrostatic shielding across different regions of the panel, particularly addressing the issue of electrostatic accumulation in large-size panels while maintaining a manageable structural complexity through modular grounding zones.
Solution Approach 2:
Ground wire vias are introduced as intermediary elements that electrically connect the first ground wire and second ground wire through the insulating layer. These vias act as mediators to establish continuous grounding paths, enabling effective electrostatic shielding without requiring direct physical contact between ground wires separated by insulating layers, thus resolving the contradiction between shielding effectiveness and structural simplicity.
2Reliability
If ground wire vias are added to connect ground wires through insulating layer, then electrostatic shielding is improved, but manufacturing complexity increases
Solution Approach 1:
The ground wire vias are formed in the insulating layer during the manufacturing process before final assembly, establishing predetermined electrical connection paths between the first and second ground wires. This preliminary action ensures that the electrostatic shielding network is pre-configured and integrated into the panel structure, simplifying subsequent assembly steps while guaranteeing reliable grounding connections.
3Reliability
If ground wires are disposed along black matrix region, then electrostatic shielding coverage is maximized, but light blocking area increases
Solution Approach 1:
Ground wires are strategically positioned along the black matrix region where electrostatic accumulation is most problematic, particularly at the periphery and corners of the display area. This localized placement maximizes shielding effectiveness in critical regions while minimizing the overall area occupied by ground wires, thereby reducing the impact on light blocking and display performance.
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 shields the electrode layers from external charges, preventing electrostatic interference and accumulation, thereby enhancing touch sensing performance and reducing defectiveness in touch panels.
Implementation Method 1
the first ground wire and the second ground wire are electrically connected with each other through the ground wire vias of the insulating layer
Implementation Method 2
the first ground wire or the second ground wire is electrically connected with a grounding terminal; and the insulating layer is provided with a ground wire vias through which the first ground wire and the second ground wire are electrically connected with each other
Data Source
AI summary
A touch panel, a display device and a manufacturing method of the touch panel are provided. The touch panel includes: a first electrode layer and a second electrode layer configured to sense a touch; an insulating layer located between the first electrode layer and the second electrode layer; a first ground wire disposed on a side of the insulating layer facing the first electrode layer; and a second ground wire disposed on a side of the insulating layer facing the second electrode layer. The first ground wire or the second ground wire is electrically connected with a grounding terminal. The insulating layer is provided with a ground wire vias through which the first ground wire and the second ground wire are electrically connected with each other.