Touch Control Signal Line Width Optimization for Corrosion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible touch screens using APC metal (Ag, Pd, Cu) are prone to electrochemical corrosion due to the inability of silver to form a stable oxide film, leading to electrical chemical migration and corrosion on touch control signal lines.
Innovation Solution
A touch control display substrate with a central touch control area and a wiring area featuring isolation lines and touch control signal lines, where the width of the first touch control signal lines is greater than the second, and a series resistance model is established to optimize line width distribution based on potential difference and water vapor factors, reducing electrochemical corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If APC metal (silver, palladium, copper) is used for touch control signal lines to achieve good electrical conductivity, then electrical conductivity is improved, but electrochemical corrosion resistance deteriorates because silver cannot form a stable passivated oxide film
Solution Approach 1:
The patent changes the physical parameter of line width to control electrochemical corrosion. By making the first touch control signal lines (adjacent to isolation lines) wider than the second touch control signal lines, the current density is reduced in high-risk areas, thereby slowing down electrochemical corrosion while maintaining good electrical conductivity throughout the signal line network.
2Ease of manufacture
If uniform line width is used for all touch control signal lines to simplify manufacturing, then manufacturing complexity is reduced, but electrochemical corrosion cannot be effectively controlled because different areas have different corrosion risks
Solution Approach 1:
The patent applies different line widths to different areas of the touch control signal lines based on their specific corrosion risks. The first touch control signal lines adjacent to isolation lines are made wider to reduce current density and corrosion risk in this high-risk area, while the second touch control signal lines away from isolation lines maintain standard width. This localized differentiation effectively controls electrochemical corrosion without significantly complicating the overall manufacturing process.
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 optimizes the time of electrochemical corrosion and improves product reliability by reducing the potential difference and current density on the touch control signal lines, slowing down the corrosion rate without additional manufacturing steps.
Implementation Method 1
Since silver cannot form a stable and passivated oxide film, the electrical chemical migration and corrosion easily occurs on the silver material
Data Source
AI summary
A touch display substrate is provided, including a central touch area and a routing area located around the central touch area, where the routing area is provided with isolation lines and a plurality of touch signal lines led out from the central touch area, the extension direction of the isolation lines is parallel to the extension direction of the touch signal lines, the touch signal lines include first touch signal lines arranged close to the isolation lines and second touch signal lines arranged far from the isolation lines, and the width of the first touch signal lines is greater than the width of the second touch signal lines. A touch display device and a touch control signal line distribution method are provided.