Display Panel TFT Structure for Mobility-Stability Tradeoffs
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Solution Overview
Problem
Current display panels face challenges in simultaneously meeting the requirements of different circuit units due to the easy turn-on and poor stability of high mobility oxide semiconductors, which complicates the balance between appropriate threshold voltage and stability.
Innovation Solution
The display panel incorporates both a first transistor with two metal sub-layers for its source and drain, and a second transistor with three metal sub-layers for its source and drain, allowing for better off-state characteristics and stability in the first transistor, while achieving higher mobility and output characteristics in the second transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high mobility oxide semiconductors are used to increase mobility rate, then the mobility rate is improved, but the stability deteriorates due to easy turn-on and poor threshold voltage control
Solution Approach 1:
The patent divides the transistor population into two segments: first transistors with two metal sub-layers for circuit units requiring stability (e.g., switching transistors), and second transistors with three metal sub-layers for circuit units requiring high mobility (e.g., driving transistors). This segmentation allows each transistor type to be optimized for its specific functional requirements without compromising overall system performance.
Solution Approach 2:
Different metal sub-layer configurations are applied to different transistors based on their specific circuit unit requirements. The first transistors use a simpler two-layer structure for stability-critical positions, while the second transistors use a more complex three-layer structure for mobility-critical positions, achieving local optimization of electrical characteristics.
2Device complexity
If a single transistor design is used throughout the display panel, then the device complexity is reduced, but the ability to meet diverse circuit unit requirements deteriorates
Solution Approach 1:
The transistor design is segmented into two variants (first and second transistors) with different metal sub-layer configurations. This segmentation enables the display panel to accommodate diverse circuit unit requirements while maintaining a relatively simple manufacturing process that only requires two types of transistor structures.
Solution Approach 2:
The patent creates a universal transistor platform that can serve multiple functions by varying the metal sub-layer count. Both first and second transistors share the same basic structure and manufacturing process, but the configurable metal sub-layer count allows them to fulfill different functional requirements across various circuit units.
Data Source
AI summary
A display panel and a method of manufacturing a display panel are provided. The display panel includes: a substrate; a first transistor disposed on the substrate, the first transistor including a first source and a first drain; and a second transistor disposed on the substrate, the second transistor including a second source and a second drain. The first source and the first drain have two metal sub-layers respectively, and the second source and the second drain have three metal sub-layers respectively. Since the first transistor and the second transistor are both included in the display panel, the advantages of the first transistor and the second transistor are respectively utilized, thereby ensuring that the requirements of different thin film transistors for each circuit unit in the display panel are met.