Touch Panel Lead Wire Shift for Voltage Degradation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch panels experience a decrease in accuracy for detecting pressing positions when used for a long time in high-temperature and high-humidity environments due to voltage degradation.
Innovation Solution
The touch panel design includes a thinner lead wire that overlaps the upper electrode wire, with its center line shifted, reducing the intensity of the electric field and regulating connection resistance, thereby maintaining detection accuracy even under prolonged DC voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a DC voltage is applied between the upper electrode wire and the lower electrode wire for a long time under high-temperature and high-humidity atmosphere, then the touch panel can be used continuously, but the voltage applied to the operation area decreases and the accuracy of detecting a pressing position decreases
Solution Approach 1:
A lead wire is introduced as an intermediary component between the lower electrode wire and the lower conductive layer. This lead wire is configured to overlap with the upper electrode wire in plan view, acting as a shield that reduces the electric field intensity between the upper and lower electrode wires, thereby preventing direct harmful interaction while maintaining electrical connection functionality
Solution Approach 2:
The lead wire is designed with specific local characteristics: it is thinner than the upper electrode wire, and its center line is shifted relative to the upper electrode wire's center line. These local quality adjustments create an optimized electric field distribution that reduces voltage degradation at the critical interface between electrodes while maintaining overall system performance
2Reliability
If the lead wire is made thinner and positioned to overlap the upper electrode wire, then the electric field intensity is reduced and connection resistance is regulated, but the device structure becomes more complex
Solution Approach 1:
The lead wire performs multiple functions simultaneously: it provides electrical connection to the lower conductive layer, acts as a shield to reduce electric field intensity between electrodes, and regulates connection resistance. By merging these functions into a single component, the design avoids adding separate elements that would increase 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 configuration effectively suppresses the deterioration of detection accuracy in high-temperature and high-humidity conditions, ensuring reliable operation of electronic devices over time.
Implementation Method 1
an intensity of an electric field generated between the upper electrode wire and the lead wire can be partially made small
Data Source
AI summary
The touch panel includes an upper wiring board and a lower wiring board. The upper wiring board includes an upper conductive layer formed on an upper substrate, and an upper electrode wire electrically connected to the upper conductive layer. The lower wiring board includes a lower conductive layer formed on a lower substrate, a lower electrode wire electrically connected to the lower conductive layer, and a lead wire electrically connected to the lower conductive layer. The lead wire is thinner than the upper electrode wire and overlaps the upper electrode wire in plan view. A center line of a range in which the upper electrode wire and the lead wire overlap each other is shifted with respect to a center line of the upper electrode wire.