TFT Substrate Protective Layer for Dry Etching Damage
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Solution Overview
Problem
During the manufacturing of thin-film transistor (TFT) substrates, dry etching processes cause surface damage to inorganic insulating layers, leading to alignment anomalies and recognition issues by CCD cameras, which conventional methods only partially address through parameter adjustments and equipment modifications.
Innovation Solution
A method involving the formation of a protective layer between the inorganic insulating layer and the metal layer, specifically a transparent conductive or photoresist protective layer, to shield the surface during dry etching, ensuring the formation of accurate metal patterns and reducing surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dry etching process is used to form metal alignment marks, then pattern accuracy is improved, but surface damage to inorganic insulating layer occurs
Solution Approach 1:
A protective layer is introduced as an intermediary between the inorganic insulating layer and the metal layer. This protective layer serves as a mediator that absorbs the harmful effects of plasma bombardment during dry etching, preventing direct damage to the inorganic insulating layer while allowing the dry etching process to proceed with high pattern accuracy.
Solution Approach 2:
The protective layer is formed beforehand on the inorganic insulating layer before the dry etching process. This pre-positioned protective layer acts as a cushion that absorbs the impact of plasma bombardment during subsequent dry etching operations, preventing surface damage to the underlying inorganic insulating layer.
2Object-affected harmful factors
If dry etching parameters are adjusted to reduce surface damage, then surface damage is reduced, but alignment mark recognition accuracy deteriorates
Solution Approach 1:
The protective layer acts as an intermediary that decouples the relationship between dry etching parameters and surface damage. By introducing this protective barrier, the system can maintain aggressive dry etching parameters for high pattern accuracy while the protective layer absorbs the harmful effects, preventing surface damage that would otherwise compromise alignment mark recognition.
3Measurement precision
If multiple CCD cameras are added to solve alignment anomalies, then alignment recognition accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The protective layer extracts and isolates the alignment mark formation process from the harmful effects of dry etching. By separating the mark formation (performed on the protective layer) from the underlying inorganic insulating layer, the system achieves high alignment recognition accuracy without needing additional CCD cameras or complex equipment modifications.
4Object-affected harmful factors
If protective layer is added between inorganic insulating layer and metal layer, then surface damage is reduced, but manufacturing process complexity increases
Solution Approach 1:
The manufacturing process is segmented into distinct stages: forming the protective layer, forming metal patterns on the protective layer, and removing the protective layer. This segmentation allows each process step to be optimized independently, reducing overall surface damage while maintaining manageable process complexity through clear separation of functions.
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 reduces surface damage to the inorganic insulating layers, improves alignment mark recognition, and avoids subsequent alignment anomalies, while eliminating the need for dry etching parameter adjustments and equipment modifications, thus lowering production costs.
Implementation Method 1
forming a protective layer on the inorganic insulating layer... to shield the surface during dry etching
Implementation Method 2
performing dry etching on the metal layer... plasma bombardment during dry etching
Implementation Method 3
mark recognition is generally performed by a charge-coupled device (CCD) camera
Data Source
AI summary
Provided are a method for manufacturing a thin-film transistor (TFT) substrate and a TFT substrate. The method for manufacturing a TFT substrate is capable of effectively protecting the surface of the inorganic insulating layer in the mark area and the mark peripheral area during performing dry etching on the metal layer by providing a protective layer between the inorganic insulating layer and the metal layer to reduce the surface damage of the inorganic insulating layer during dry etching, thereby effectively improving the recognition rate of the alignment mark by the CCD camera in the subsequent alignment process, improving the alignment detection accuracy, and avoiding subsequent alignment anomalies. In addition, it is not necessary to adjust the dry etching parameters of the metal layer, which indirectly reduces the process constraints of the dry etching process, avoids modification and calibration of the alignment CCD camera, and lowers production costs.