Touch Screen Lead-Out Lines with Varying Widths
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Solution Overview
Problem
The increase in size of touch screens leads to longer lead-out lines, resulting in higher wiring resistance and increased probability of breakdown due to electrostatic discharge, which can cause loss of touch function and line defects in display devices.
Innovation Solution
The implementation of lead-out lines with varying widths, specifically designed to reduce their resistance values below those of the area lines, along with a multilayer structure including an aluminum-based alloy and nitride layer, and a shield line to minimize cross-capacitance and parasitic capacitance, effectively reducing the risk of electrostatic discharge-induced breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of touch screen is increased, then the detection area and functionality are improved, but the length of lead-out line increases resulting in higher wiring resistance and increased probability of breakdown due to electrostatic discharge
Solution Approach 1:
The patent applies different width specifications to different sections of the lead-out line. Specifically, the lead-out line has a first width in the detection area and a second width (wider than the first width) in the external area. This local quality differentiation reduces wiring resistance in the external area where electrostatic discharge risk is higher, thereby reducing breakdown probability without unnecessarily increasing the overall area.
Solution Approach 2:
The patent changes the physical parameter (width) of the lead-out line along its length. By making the lead-out line wider in the external area compared to the detection area, the resistance is reduced in the critical external area where electrostatic discharge is more likely to occur. This parameter change directly addresses the reliability issue while minimizing area increase.
2Reliability
If the width of lead-out line is increased to reduce resistance, then the reliability against electrostatic discharge is improved, but the area occupied by lead-out line increases
Solution Approach 1:
The patent applies different width specifications to different sections of the lead-out line. Specifically, the lead-out line has a first width in the detection area and a second width (wider than the first width) in the external area. This local quality differentiation reduces wiring resistance in the external area where electrostatic discharge risk is higher, thereby reducing breakdown probability without unnecessarily increasing the overall area.
3Speed
If mesh wire made of low-resistance metal is used instead of transparent conductive film, then detection speed and touch screen size are improved, but wiring resistance of lead-out line increases due to longer length in external area
Solution Approach 1:
The patent applies different width specifications to different sections of the lead-out line. Specifically, the lead-out line has a first width in the detection area and a second width (wider than the first width) in the external area. This local quality differentiation reduces wiring resistance in the external area where electrostatic discharge risk is higher, thereby reducing breakdown probability without unnecessarily increasing the overall area.
Solution Approach 2:
The patent changes the physical parameter (width) of the lead-out line along its length. By making the lead-out line wider in the external area compared to the detection area, the resistance is reduced in the critical external area where electrostatic discharge is more likely to occur. This parameter change directly addresses the reliability issue while minimizing area increase.
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 significantly reduces the likelihood of breakdown due to electrostatic discharge, enhances the reliability of touch screens, and allows for increased response speed and reduced frame size of touch panels while maintaining detection accuracy.
Implementation Method 1
Two or more of the lead-out lines include width adjusting lines determined to have widths differing from each other to make the respective resistance values of all of the lead-out lines lower than the resistance value of the area lines
Implementation Method 2
a shield line to minimize cross-capacitance and parasitic capacitance
Implementation Method 3
make the respective resistance values of all of the lead-out lines lower than the resistance value of the area lines... significantly reduces the likelihood of breakdown due to electrostatic discharge
Data Source
AI summary
A plurality of area lines extends in a first direction while being aligned in a second direction perpendicular to the first direction in a predetermined area. A plurality of lead-out lines electrically connects a plurality of terminal parts and the area lines to each other. Two or more of the lead-out lines include width adjusting lines determined to have widths differing from each other to make the respective resistance values of all of the lead-out lines lower than the resistance value of the area lines.