Dual-Layer Transistor Active Regions for Display Panels
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display panels face challenges in achieving low power consumption, high reliability, and low leakage current in the off state, which are essential for high-quality display luminance, due to the limitations of thin film transistors used in pixel circuits.
Innovation Solution
The use of a display panel with pixel circuits that incorporate transistors having at least two active layers with different mobilities, where one layer has a higher mobility for low power consumption and high reliability, and another layer with lower mobility for low cut-off current, allowing for stable and accurate light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin film transistors are used in pixel circuits, then the display panel can be manufactured with conventional processes, but the power consumption is high, reliability is low, and leakage current in the off state is high
Solution Approach 1:
The patent employs a dual-layer active layer structure where the first active layer (high mobility) is positioned in the channel region and the second active layer (low mobility) is positioned in the source and drain regions. This composite structure combines the advantages of both material types: the high mobility layer ensures low power consumption and high reliability during operation, while the low mobility layer suppresses leakage current in the off state. This resolves the technical contradiction by integrating two materials with complementary properties into a single transistor device.
2Reliability
If thin film transistors are used in pixel circuits, then the manufacturing process is simpler, but the leakage current in the off state is high
Solution Approach 1:
The patent applies local quality by assigning different mobility characteristics to different regions of the transistor. The first active layer with high mobility is localized in the channel region where high carrier mobility is needed for low power consumption and high reliability. The second active layer with low mobility is localized in the source and drain regions where low leakage current is critical. This spatial differentiation of material properties resolves the contradiction between reliability and leakage current suppression.
3Reliability
If multiple films are used to achieve different transistor characteristics, then the transistor performance can be optimized, but the manufacturing process becomes more complex and production costs increase
Solution Approach 1:
The patent merges the functions of two separate transistors (one optimized for low power consumption with high mobility material, and another optimized for low leakage current with low mobility material) into a single dual-layer active layer transistor. By combining the first and second active layers within one transistor structure, the patent achieves the performance benefits of multiple specialized transistors while reducing device complexity and the number of films required, thus resolving the contradiction between performance optimization and manufacturing simplicity.
Data Source
AI summary
Provided are a display panel and a display device. The display panel includes a substrate and multiple pixel circuits located on a side of the substrate. Each of at least part of the multiple pixel circuits includes a first transistor. The first transistor includes at least two active layers having different mobilities. At least two active layers having different mobilities include a first active layer and a second active layer which are laminated. The mobility of the first active layer is larger than the mobility of the second active layer. Therefore, the structure and the manufacturing process of the display panel can be simplified, facilitating the lightweight and low cost of the display panel.