Flat-Panel Display Dummy Lines for Electrostatic Discharge
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Solution Overview
Problem
Flat-panel display devices face challenges in managing static electricity during manufacturing, which can damage circuits and wiring lines, leading to potential short-circuits and manufacturing defects.
Innovation Solution
The implementation of a design that includes dummy pads and lines with projections on the array substrate, which are connected to floating dummy lines and conductive particles in the sealant, allowing for the discharge of static electricity away from the active area, thereby preventing it from reaching signal lines and switching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If projection portions are formed on wiring portions to discharge electrostatic charge, then static electricity resistance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts the electrostatic discharge function from the signal wiring by introducing separate dummy pads and dummy lines. These dummy structures are specifically designed to capture and discharge static electricity away from the active signal lines, thereby protecting the circuit without modifying the original wiring functionality.
Solution Approach 2:
Dummy pads and dummy lines serve as intermediary structures between the signal lines and the substrate surface. They act as sacrificial elements that intercept static electricity before it can reach sensitive circuits, providing a safe discharge path without interfering with normal signal transmission.
2Reliability
If connection portions for common lines are disposed opposite to inspection lines, then electrostatic discharge from common lines is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention creates dummy pads that are positioned opposite to inspection lines, effectively copying the protective discharge mechanism to locations that do not interfere with signal transmission. These dummy structures replicate the electrostatic discharge function in strategic locations where they can capture charges without disrupting normal operations.
3Object-affected harmful factors
If dummy pads and lines are added to the array substrate, then static electricity suppression is improved, but manufacturing process complexity increases
Solution Approach 1:
The dummy pads and dummy lines are formed during the same manufacturing process steps as the signal lines, specifically during the conductive layer formation stage. By incorporating the electrostatic protection structures into the existing manufacturing flow without requiring additional processing steps, the invention achieves static electricity suppression while maintaining manufacturing simplicity.
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 suppresses the flow of static electricity, reducing the risk of short-circuits and manufacturing defects, thus enhancing the yield and reliability of flat-panel display devices.
Implementation Method 1
a first dummy line connected to the dummy pad, spaced apart from the signal line and including a first projection protruding in a direction crossing a direction of extension of the first dummy line, and a second dummy line spaced apart from the dummy pad and the signal line and including a second projection opposed to the first projection
Data Source
AI summary
According to one embodiment, a flat-panel display device includes a first substrate including an output pad to which a signal necessary for displaying an image on an active area is supplied from a signal supply source, a dummy pad juxtaposed with the output pad, a signal line connected to the output pad, a switching element connected to the signal line, a pixel electrode connected to the switching element in the active area, a first dummy line connected to the dummy pad, spaced apart from the signal line and including a first projection protruding in a direction crossing a direction of extension of the first dummy line, and a second dummy line spaced apart from the dummy pad and the signal line and including a second projection opposed to the first projection.