Metal Oxide TFT Buffer Layer for Simplified Manufacturing
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Solution Overview
Problem
The manufacturing process of metal oxide TFTs is complex due to the need for additional protective layers, increasing the number of patterning processes and production costs, which is challenging for large-size liquid crystal displays requiring higher mobility and frequency.
Innovation Solution
A method involving sequential deposition of a first and second metal oxide layer, where the conductivity of the second metal oxide layer is higher than the first, allowing for the formation of a buffer layer that protects the active layer and reduces contact resistances, enabling the source and drain electrodes to be formed through a single patterning process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is added over the metal oxide layer to avoid destruction during source and drain electrode formation, then the metal oxide layer is protected, but the number of patterning processes increases and production efficiency decreases
Solution Approach 1:
The patent combines the protective layer and the metal oxide layer into a single integrated layer structure. The metal oxide layer itself serves dual functions as both the active layer and the protective layer, eliminating the need for separate protective layer deposition and additional patterning processes while maintaining protection during source and drain electrode formation
Solution Approach 2:
The metal oxide layer is designed to perform multiple functions simultaneously: it serves as the active layer for transistor operation, as a protective layer during subsequent processing, and as a barrier layer. This multi-functionality reduces the total number of layers and processes required in the manufacturing sequence
2Reliability
If a protective layer is added over the metal oxide layer, then the metal oxide layer is protected, but the number of patterning processes increases and manufacturing complexity increases
Solution Approach 1:
The patent merges the protective layer function into the metal oxide layer itself, reducing the total layer count from multiple separate layers (metal oxide layer + protective layer) to a single integrated metal oxide layer that performs both active and protective functions
Solution Approach 2:
The patent extracts the protective function from a separate protective layer and integrates it into the metal oxide layer, eliminating the need for additional protective layer deposition and patterning processes while maintaining the protection capability during source and drain electrode formation
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 simplifies the manufacturing process, reduces production costs, and enhances the performance of metal oxide TFTs by protecting the active layer and minimizing contact resistances, making it suitable for large-size liquid crystal displays with higher frequency requirements.
Implementation Method 1
sequentially depositing a first metal oxide layer, a second metal oxide layer and a source and drain metal layer
Data Source
AI summary
Embodiments of the present invention provide a thin film transistor array substrate, a method for manufacturing the same, a display panel and a display device. The method for manufacturing the thin film transistor array substrate comprises: sequentially depositing a first metal oxide layer, a second metal oxide layer and a source and drain metal layer, conductivity of the first metal oxide layer being smaller than conductivity of the second metal oxide layer; patterning the first metal oxide layer, the second metal oxide layer and the source and drain metal layer, so as to form an active layer, a buffer layer, a source electrode and a drain electrode, respectively. According to technical solutions of the embodiments of the invention, it is possible that the manufacturing process of the metal oxide TFT array substrate is simplified, and the production cost of products is reduced.