TFT Array Substrate with Composite Active Layer for Electron Mobility
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Solution Overview
Problem
Current thin-film transistor technologies face challenges in achieving optimal electron mobility, on/off ratio, and durability due to limitations in materials like amorphous silicon, polycrystalline silicon, and oxide semiconductors, which affect the performance and cost-effectiveness of display devices.
Innovation Solution
A thin-film transistor array substrate with an active layer comprising semiconductor material and carbon allotropes, featuring regions of different thicknesses, where carbon allotropes such as reduced graphene oxide, graphene nanoribbons, or carbon nanotubes are dispersed, improving electron mobility and maintaining a balanced on/off ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If amorphous silicon is used as the semiconductor material, then the production cost is low and the film-forming process is simple, but the electron mobility is as low as 0.5 cm²/Vs
Solution Approach 1:
The patent uses a composite active layer structure combining amorphous silicon and oxide semiconductor materials. The amorphous silicon layer provides ease of manufacturing while the oxide semiconductor layer enhances electron mobility, achieving both low production cost and high performance in the thin-film transistor
Solution Approach 2:
The patent creates different thickness regions within the active layer - a first region with smaller thickness and a second region with larger thickness. This local variation in thickness allows optimization of electron mobility in specific areas while maintaining overall manufacturing simplicity
2Ease of manufacture
If the active layer has uniform thickness, then the manufacturing process is simple, but the device characteristics such as electron mobility and on/off ratio cannot be optimized
Solution Approach 1:
The patent implements an active layer with spatially varying thickness, where a first region has a smaller thickness and a second region has a larger thickness. This local quality variation enables optimization of electron mobility and on/off ratio in different areas of the transistor while maintaining a relatively simple manufacturing process
Solution Approach 2:
The patent introduces thickness variation as an additional degree of freedom in the active layer design. By controlling the thickness dimension differently across the active layer area, the patent achieves enhanced device characteristics without fundamentally changing the manufacturing approach
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
The solution enhances electron mobility and prevents threshold voltage shifts, improving the overall performance and reliability of thin-film transistors while maintaining cost-effectiveness, suitable for various display devices like OLEDs and LCDs.
Implementation Method 1
an active layer, which has a first region and a second region having different thicknesses, and comprises at least a semiconductor material and carbon allotropes
Data Source
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AI summary
A thin-film transistor array substrate and a display device are disclosed. The thin-film transistor array substrate includes a substrate, a gate electrode disposed on the substrate, an active layer, which opposites the gate electrode, has a first region and a second region having different thicknesses, and comprises at least a semiconductor material, a gate insulating film interposed between the gate electrode and the active layer, and a source electrode and a drain electrode, which are respectively in contact with the active layer.