Touch Unit Pad Connection Line Design for Electrostatic Reliability
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Solution Overview
Problem
Touch units in display devices can be rendered inoperable due to electrostatic defects in touch driving wires, which affect their ability to detect touch inputs accurately.
Innovation Solution
The design includes a touch unit with a pad connection line that has a wider contact area with the touch driving wire than with the pad electrode line, and a touch signal layer that overlaps the touch driving wires, ensuring stable electrical connections and preventing electrostatic defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pad connection line has a larger contact area with the touch driving wire, then the electrical connection reliability is improved, but the manufacturing complexity increases
Solution Approach 1:
The pad connection line is configured to extend in the first direction (length dimension) to increase contact area with the touch driving wire, rather than increasing width. This dimensional approach allows larger contact area without proportionally increasing overall connection structure complexity, as the extension is along the existing wire trajectory.
Solution Approach 2:
The pad connection line is divided into multiple segments: a first region contacting the touch driving wire and a second region contacting the pad electrode line. This segmentation allows each region to be optimized independently for its specific function while maintaining overall structural manageability.
2Reliability
If the touch signal layer overlaps the touch driving wires, then electrostatic interference is reduced, but the device structure becomes more complex
Solution Approach 1:
The touch signal layer is positioned in the thickness direction (third direction) to overlap the touch driving wires, creating a three-dimensional shielding structure. This vertical arrangement provides electrostatic protection without requiring lateral expansion or additional planar layers, thus limiting the increase in overall device footprint and structural complexity.
Solution Approach 2:
The touch signal layer acts as an intermediary shielding layer between external electrostatic interference and the touch driving wires. By placing this conductive layer in overlap, it serves as a protective mediator that dissipates or redirects electrostatic charges before they can affect the underlying touch driving wires.
3Stability of the object's composition
If the width of the first region is greater than the width of the second region, then the electrical connection stability is improved, but the material usage increases
Solution Approach 1:
The pad connection line exhibits non-uniform width distribution: the first region (contacting touch driving wire) has greater width for enhanced electrical connection stability, while the second region (contacting pad electrode line) has smaller width. This local quality variation optimizes connection stability at the critical interface without unnecessarily increasing material usage throughout the entire connection line.
Solution Approach 2:
The width parameter of the pad connection line is varied along its length to match functional requirements. The first region uses a larger width parameter to ensure stable electrical connection with the touch driving wire, while the second region uses a smaller width parameter sufficient for pad electrode line contact, thereby optimizing material usage according to local functional demands.
Data Source
AI summary
A touch unit is provided including a touch electrode disposed in a sensor region. A touch driving wire is connected to the touch electrode. The touch driving wire includes a first routing line connected to a first side of the touch electrode and a second routing line branched from the first routing line and connected to a second side of the touch electrode. A pad electrode line is spaced apart from the touch driving wire. The pad electrode line is connected to a pad. A pad connection line is connected to the touch driving wire and the pad electrode line. The pad connection line is disposed in a different layer from the touch driving wire. An area in which the pad connection line is in contact with the first routing line is greater than an area in which the pad connection line is in contact with the pad electrode line.