Touch Panel ESD Protection via Layered Capacitor Structures
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Solution Overview
Problem
Current touch panel designs face challenges in electrostatic discharge (ESD) protection, particularly for larger ESD events, which can lead to loss of touch function and reduced product yield and performance due to limited antistatic protection.
Innovation Solution
A touch panel design featuring signal transmission lines connected to touch electrodes and a ground wire at a different layer, with intersections forming capacitor structures to store and discharge static electricity, using a widened line width and suitable materials like indium tin oxide or graphene, and an insulation medium layer for enhanced electrostatic protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a GND line is used to encircle the touch electrode for ESD protection, then small ESD events are protected, but larger ESD events still cause damage and touch function loss
Solution Approach 1:
The patent divides the ESD protection function into multiple capacitor structures distributed at different locations (four corners and center) of the touch electrode. Each capacitor structure consists of signal transmission lines and ground wires forming parallel plate capacitors. This segmentation allows the system to handle larger ESD events by distributing the charge storage capacity across multiple locations, overcoming the limitation of a single GND line enclosure.
2Reliability
If the line width of signal transmission lines is increased to improve ESD protection, then the antistatic threshold increases, but the manufacturing precision and design flexibility may be affected
Solution Approach 1:
The patent specifies a particular line width range (0.5mm to 2.0mm) for signal transmission lines to optimize the balance between ESD protection capability and manufacturing feasibility. This parameter optimization ensures that the capacitor structures have sufficient charge storage capacity while remaining within standard manufacturing tolerances. The patent also provides specific spacing requirements (0.1mm to 0.5mm) between capacitor structures to maintain design flexibility.
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 stores and discharges static electricity, preventing loss of touch function and improving product yield and performance by increasing the antistatic threshold, effectively protecting inner pixels and enhancing ESD protective performance.
Implementation Method 1
a plurality of capacitor structures for storing static electricity is formed by the signal transmission lines and the ground wire at intersections
Data Source
AI summary
The present disclosure discloses a touch panel, a method for manufacturing the same, and a display device. The method includes forming signal transmission lines that are connected with touch electrodes on the touch panel, and forming a ground wire that is arranged at a different layer from and insulated from the signal transmission lines, a projection of the ground wire onto a plane in which the signal transmission lines are located intersecting the signal transmission lines. A plurality of capacitor structures for storing static electricity is formed by the signal transmission lines and the ground wire at intersections.