Array Substrate Hollow Layout for Laser Short-Circuit Repair
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Solution Overview
Problem
Conventional array substrates face yield reduction and switch unit scrapping due to unrepairable short circuits between stacked metal layers, as laser repair methods are ineffective due to susceptibility of the first metal layer.
Innovation Solution
The array substrate design includes a hollow area in the first metal layer, with a semiconductor layer having distinct areas for TFT sets, allowing laser disconnection of defective TFTs in the second metal layer without damaging the first metal layer, enabling repair of short circuits between metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If laser is used to disconnect the second metal layer to repair short circuits, then short circuit repair is enabled, but the first metal layer is damaged due to laser susceptibility
Solution Approach 1:
The first metal layer is segmented by creating a hollow area that removes a portion of the metal, dividing it into separate regions. This segmentation allows the laser to pass through the hollow area without damaging the first metal layer, enabling safe disconnection of the second metal layer for repair purposes.
Solution Approach 2:
A portion of the first metal layer is extracted to create the hollow area. This removed section serves as a protective opening that prevents laser damage to the remaining first metal layer structures while allowing the repair laser to reach and disconnect the second metal layer.
2Ease of repair
If conventional laser repair method is used, then short circuit repair is attempted, but repair fails due to first metal layer susceptibility
Solution Approach 1:
The hollow area is created in advance during the manufacturing process, before any potential short circuit defects occur. This preliminary structural modification ensures that when repair is needed, the laser can safely pass through the pre-existing hollow area without damaging the first metal layer, guaranteeing reliable repair capability.
3Strength
If the first metal layer is kept intact for structural integrity, then structural strength is maintained, but laser repair of short circuits becomes impossible
Solution Approach 1:
The first metal layer is maintained with high structural integrity in all regions except for the localized hollow area. This local modification creates a specific zone with different properties (an opening) that enables laser penetration, while the rest of the first metal layer retains its full structural strength and functionality.
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 design allows for the repair of short circuits between metal layers, preventing switch unit failure and reducing yield loss by enabling laser disconnection through the hollow area, thus maintaining functional switch units.
Implementation Method 1
laser disconnection through the hollow area
Data Source
AI summary
An array substrate, a manufacturing method thereof, and a short circuit repair method are provided. The array substrate includes at least one switch unit, wherein each of the switch unit includes a first thin film transistor (TFT) set and a second TFT set, a hollow area is disposed on a first metal layer, a semiconductor layer includes a first area corresponding to the first TFT set and a second area corresponding to the second TFT set, and a vertical projection of an area between the first area and the second area on a substrate completely covers a vertical projection of the hollow area on the substrate.