LCD Mother Substrate Static Electricity Blocking Structure
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Solution Overview
Problem
Static electricity generated during the manufacturing of liquid crystal display (LCD) mother substrates can deteriorate the characteristics of active matrix arrays and cause dielectric breakdown, especially when using metal line materials with low resistance.
Innovation Solution
The mother substrate incorporates test lines connected by first connection lines that are formed between active matrix arrays, test pads, and a driving circuit unit, with these connection lines being made of metal patterns and removed during the etching process of the passivation layer to disperse static electricity and prevent it from reaching the driving circuit unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If metal line materials with low resistance are used, then electrical conductivity is improved, but static electricity easily reaches the active matrix arrays causing dielectric breakdown
Solution Approach 1:
A static electricity blocking structure is introduced as an intermediary between the metal line materials and the active matrix arrays. This structure acts as a mediator that allows normal electrical signal transmission while blocking harmful static electricity from reaching the active matrix arrays, thus resolving the contradiction between maintaining electrical conductivity and preventing static electricity damage.
Solution Approach 2:
The patent converts the harmful static electricity into a beneficial protective mechanism by designing the static electricity blocking structure to preferentially conduct or dissipate static charges away from the active matrix arrays. The structure that could potentially conduct electricity is instead configured to protect the sensitive elements by directing static discharge to safe paths.
2Productivity
If a plurality of active matrix arrays are formed on a large-sized mother substrate, then productivity is improved, but static electricity generation during manufacturing increases
Solution Approach 1:
The large-sized mother substrate is divided into multiple active matrix arrays, each surrounded by static electricity blocking structures. This segmentation approach allows the benefits of large-scale manufacturing while distributing and controlling static electricity generation through localized blocking structures around each array and in inter-array regions.
Solution Approach 2:
Static electricity blocking structures are introduced as intermediary elements between adjacent active matrix arrays on the mother substrate. These structures serve as mediators that manage static electricity generation during the manufacturing process, allowing high-density array formation while preventing static discharge damage.
3Difficulty of detecting and measuring
If test lines are connected between active matrix arrays, then testing capability is improved, but pathways for static electricity to reach driving circuit unit are created
Solution Approach 1:
Static electricity blocking structures are positioned along the test lines that connect active matrix arrays to the driving circuit unit. These blocking structures act as intermediaries that allow testing signals to pass through while blocking harmful static electricity, thus maintaining both testing capability and protection against static discharge.
Solution Approach 2:
The test lines are designed with localized static electricity blocking structures at critical points where static discharge risk is highest. This local quality approach maintains the overall testing functionality while providing targeted protection at specific vulnerable locations along the test line pathways.
Data Source
AI summary
A mother substrate for a liquid crystal display comprises a plurality of active matrix arrays, test lines connected to the active matrix arrays, test pads connected to the test lines, and connection lines connecting test lines to each other.