Mother Substrate Electrostatic Discharge Patterns for LCD Manufacturing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mother substrates for liquid crystal display devices suffer from static electricity issues, which can deteriorate unit array patterns and increase production costs due to the need for additional inspection steps and reduced productivity.
Innovation Solution
A mother substrate with a comprehensive electrostatic discharge pattern system, including first, second, and third electrostatic discharge patterns, and a shortage pattern, that ensures static electricity is discharged effectively, preventing damage to unit array patterns and allowing for efficient cutting and assembly of LCD devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single electrostatic discharge pattern is used around the mother substrate, then static electricity at the outer portion can be discharged, but static electricity generated at inner portions cannot be effectively discharged
Solution Approach 1:
The electrostatic discharge pattern is divided into multiple segments: a first ESD pattern surrounding the unit array patterns, second ESD patterns extending from gate lines to the first ESD pattern, and third ESD patterns extending from data lines to the first ESD pattern. This segmentation allows static electricity to be discharged from multiple locations throughout the substrate, effectively addressing both outer and inner portion static electricity generation.
2Measurement precision
If inspection is performed after cutting substrates, then defective units can be identified, but productivity is reduced and additional process steps are required
Solution Approach 1:
The electrostatic discharge patterns are designed and formed in advance during the mother substrate fabrication process, before the substrate is cut into individual display units. This preliminary protection ensures that static electricity discharge paths are already in place during subsequent handling and assembly operations, eliminating the need for post-cutting inspection and rework.
3Shape
If the electrostatic discharge pattern is removed after cutting, then the final product is clean without discharge patterns, but the protection is lost during the cutting and assembly process
Solution Approach 1:
The ESD patterns are segmented such that they extend beyond the boundaries of individual display units. When the mother substrate is cut, the ESD patterns are distributed across multiple units, with portions remaining on each unit to provide ongoing protection during assembly while the excessive portions can be trimmed or left as minimal remnants that do not affect the final product appearance.
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
The electrostatic discharge pattern system ensures that static electricity is safely discharged, reducing the risk of pattern deterioration and enabling a more streamlined production process with improved productivity and reduced costs by allowing for inspection before cutting the substrates.
Implementation Method 1
an electrostatic discharge pattern, that is, a pattern having a function of discharging static electricity, is formed on the gate insulating layer 71, the passivation layer 81 and the pixel electrode 11
Implementation Method 2
the electrostatic discharge pattern... connected to the gate line 14 and extending to an outer portion of the first electrostatic discharge pattern 65... connected to the data line 16 and extending to an outer portion of the first electrostatic discharge pattern 65
Data Source
AI summary
A mother substrate for a liquid crystal display device includes: a substrate; a plurality of unit array patterns on the substrate, each of the plurality of unit array patterns including a gate line, a data line crossing the gate line, a thin film transistor connected to the gate line and the data line and a pixel electrode connected to the thin film transistor; a first electrostatic discharge pattern surrounding the plurality of unit array patterns; a second electrostatic discharge pattern connected to the gate line and crossing the first electrostatic discharge pattern; and a third electrostatic discharge pattern connected to the data line and crossing the first electrostatic discharge pattern, the third electrostatic discharge pattern contacting the second electrostatic discharge pattern.