Capacitive Touch Screen Electrostatic Damage Prevention
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Solution Overview
Problem
Capacitive touch screen panels are prone to damage during manufacturing due to electrostatic electricity, which can cause high current flow through small contact holes and protruded electrode patterns, leading to damage and electrical field convergence.
Innovation Solution
Increasing the number of contact holes to reduce resistance, using materials with low resistivity or multi-layer metal layers for connection patterns, and ensuring multiple connection paths to distribute load and maintain normal operation, while also increasing the distance between electrode and connection pattern parts to minimize electric field strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the contact holes are made small to improve touch precision, then the manufacturing precision is improved, but the resistance increases and the panel becomes vulnerable to electrostatic damage
Solution Approach 1:
The connection pattern is divided into multiple segments (first connection pattern and second connection pattern) that are spatially separated. Each segment connects to electrode patterns through separate contact holes, distributing the electrostatic load and reducing the risk of complete failure from a single breakdown event.
Solution Approach 2:
The insulation layer serves as an intermediary barrier between the substrate and the electrode patterns. It provides electrical isolation while allowing controlled connections through contact holes, and the protruded portions of connection patterns create air gaps that further mediate electric field distribution.
2Area of stationary object
If the electrode patterns are made close to each other to improve display density, then the area is reduced, but the electric field strength increases and causes electrostatic discharge
Solution Approach 1:
The connection patterns are designed with asymmetric protruded portions that extend toward the insulation layer. This asymmetric geometry creates non-uniform air gaps that disrupt the symmetry of electric field lines, preventing field convergence between adjacent electrode patterns while maintaining close spacing.
Solution Approach 2:
The connection patterns utilize the vertical dimension by protruding into the insulation layer, creating three-dimensional structures. This vertical extension increases the effective spacing between electrode patterns in the vertical direction, reducing electric field strength without compromising horizontal display density.
3Device complexity
If single connection pattern is used to simplify structure, then the device complexity is reduced, but the reliability under electrostatic stress decreases
Solution Approach 1:
The connection pattern is segmented into multiple independent paths (first and second connection patterns) that are spatially separated. This segmentation provides redundancy, ensuring that if one path fails due to electrostatic breakdown, the other path can maintain electrical connectivity.
Solution Approach 2:
The protruded portions of the connection patterns create pre-established air gaps and increase spacing before electrostatic discharge can occur. This structural design provides a cushioning effect that prevents direct contact and reduces the likelihood of electrostatic breakdown.
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
Significantly increases the critical breakdown voltage, reducing damage from electrostatic discharges and ensuring the capacitive touch screen panel's operational integrity by lowering contact resistance and distributing electrostatic loads.
Implementation Method 1
The capacitive type touch screen panel senses a touched position according to a difference in capacitance created in an upper or lower plate when the user physically is contacted with a conductive film formed on the upper or lower plate
Implementation Method 2
a very high current abruptly flows into the conductive material filled in the contact holes 31a and 31b having very high resistance, thereby damaging the contact holes 31a and 31b or the first connection pattern 20 contacted with the conductive material filled in the contact holes 31a and 31b
Data Source
AI summary
A touch screen panel to provide a type touch screen panel that can prevent or reduce a damage of the touch screen panel caused by electrostatic electricity, includes a plurality of first electrode patterns which are separated from each other, and connected by at least one of a plurality of first connection patterns that includes a first portion exposed through at least two first contact holes and a second portion exposed through at least two second contact holes.