Touch Panel Short-Circuit Wiring for Electrostatic Discharge Protection
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Solution Overview
Problem
Projected-capacitive-type touch panels are prone to electrostatic discharge during manufacturing, which can break the insulating film and reduce yield, with existing solutions requiring additional components like conductive tape for protection.
Innovation Solution
Incorporating a short-circuit wiring line that connects lead lines to the same potential, eliminating the need for additional members like conductive tape by forming the short-circuit wiring line on the glass substrate or the external circuit board, thereby preventing electrostatic damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive tape is attached to connect sensor-wiring lines to the same potential for preventing electrostatic discharge, then electrostatic destruction is prevented, but additional members and manual work are required
Solution Approach 1:
The patent merges the electrostatic protection function into the existing FPC structure by forming conductive patterns directly on the FPC surface. These patterns connect to terminal parts of sensor-wiring lines, eliminating the need for separate conductive tapes while achieving the same potential equalization effect.
Solution Approach 2:
The FPC is designed to provide its own electrostatic protection capability through integrated conductive patterns. The system becomes self-sufficient for electrostatic discharge prevention without requiring external protective materials or manual intervention, as the protection mechanism is built into the FPC structure itself.
2Reliability
If conductive tape is manually attached to sensor-wiring line terminals for electrostatic protection, then electrostatic destruction is prevented, but manual labor is required
Solution Approach 1:
The FPC is designed to provide its own electrostatic protection capability through integrated conductive patterns. The system becomes self-sufficient for electrostatic discharge prevention without requiring external protective materials or manual intervention, as the protection mechanism is built into the FPC structure itself.
Solution Approach 2:
The patent replaces the mechanical process of manually attaching conductive tape with an automated pattern formation process on the FPC. The conductive patterns are created through standard FPC manufacturing techniques, substituting manual mechanical assembly with automated fabrication processes.
3Reliability
If additional conductive members are attached for electrostatic protection, then electrostatic destruction is prevented, but manufacturing complexity increases
Solution Approach 1:
The patent merges the electrostatic protection function into the existing FPC structure by forming conductive patterns directly on the FPC surface. These patterns connect to terminal parts of sensor-wiring lines, eliminating the need for separate conductive tapes while achieving the same potential equalization effect.
Solution Approach 2:
The FPC serves multiple functions: it provides electrical connections for sensor-wiring lines and simultaneously provides electrostatic protection through its integrated conductive patterns. This multi-functionality eliminates the need for separate protective components and simplifies 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 configuration effectively prevents electrostatic destruction without additional components, simplifies the manufacturing process, and ensures long-term protection against electrostatic interference.
Implementation Method 1
the insulating film is sometimes broken by an electrostatic discharge caused by the charged surface of the glass substrate
Data Source
AI summary
First and second sensor elements are arranged on a substrate. First sensor-wiring line is connected to the first sensor element. An insulating film covers the first sensor-wiring line. Second sensor-wiring line is connected to the second sensor element and separated from the first sensor-wiring line by the insulating film in the thickness direction. First and second terminal parts are for being connected to an external circuit board, and are provided at an end of the first sensor-wiring line and at an end of the second sensor-wiring line, respectively. First and second lead lines extend from the first and second terminal parts, respectively. The short-circuit wiring line connects the first and second lead lines to each other.