Active Matrix Circuit Protection Cutoff Part Design
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Solution Overview
Problem
In the manufacturing of active matrix circuits, defects such as decreased resistance between signal wires can occur due to electrostatic breakdown, leading to unintended current flow and potential short circuits when cutting connection wires to rectify these defects, as conductive material may adhere to contact holes.
Innovation Solution
Incorporating a cutoff part in the connection wire, positioned equidistant from its connection points, which can be marked for clear identification, to prevent conductive material dispersion and adherence during cutting, thereby modifying the protection circuit to prevent defects and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection wire is cut with a laser to remove defective protection circuits, then the resistance defect between signal wires is corrected, but electrically conductive material disperses and adheres to contact holes causing short circuits
Solution Approach 1:
The patent applies preliminary action by forming a cutoff part at a specific position on the connection wire before the laser cutting process. This cutoff part is positioned at a distance from the contact hole to prevent conductive material dispersion during cutting. By pre-positioning this cutoff structure, the patent ensures that when laser cutting is performed, any dispersed conductive material will not reach and adhere to the contact hole, thus preventing short circuit defects while maintaining the ability to remove defective protection circuits
2Manufacturing precision
If the cutoff part is positioned close to the contact hole for precise defect removal, then the protection circuit can be accurately modified, but conductive material easily adheres to the contact hole during cutting
Solution Approach 1:
The patent applies local quality by creating a cutoff part with specific local characteristics at a predetermined position on the connection wire. This cutoff part has distinct structural features (such as reduced width or increased height) that differentiate it from other portions of the connection wire. By localizing this special structure at a position away from the contact hole, the patent achieves precise defect removal capability while simultaneously preventing conductive material adhesion to the contact hole during laser cutting
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 approach effectively modifies the protection circuit to prevent defects and short circuits by ensuring the conductive material does not adhere to contact holes during cutting, maintaining signal integrity and circuit functionality.
Implementation Method 1
the connection wire is cut with the laser
Data Source
AI summary
The active matrix circuit comprises a protection circuit which protects an active element from static electricity. In the protection circuit, a TFT (switching element) is connected via a connection wire between gate wires (signal wires). The connection wire includes a cutoff part, and a mark representing the cutoff part is located. A middle point which is equally distant from two contact holes (connection points) closest to the connection wire is included in a range of the cutoff part. In a case where a defect occurs, the cutoff part of the connection wire connected to the TFT concerned with the defect is cut. The protection circuit is modified by the cutting. The cutoff part is away from the contact hole, thereby preventing an electrically conductive material which disperses from adhering to the contact hole.