Germanium-Doped Semiconductor Layer for High Mobility OLED Displays
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Solution Overview
Problem
Conventional amorphous silicon thin-film transistors have low mobility, which limits their application in OLED displays, requiring improved semiconductor materials for enhanced performance.
Innovation Solution
A display panel with a semiconductor layer comprising an oxygen-rich germanium-doped compound, such as an oxygen-rich germanium or germanium-silicon compound, is used, which increases mobility beyond that of amorphous silicon, including a substrate with a first metal layer, an insulating layer, and a second metal layer with a passivation layer, and a trench structure to separate source and drain metal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional amorphous silicon is used in the semiconductor layer, then the manufacturing process is simple and cost-effective, but the mobility is low and cannot meet OLED display requirements
Solution Approach 1:
The patent changes the material composition parameters of the semiconductor layer by introducing germanium-doped semiconductor compounds with specific germanium content (5-50 at%) and oxygen-rich configurations. This parameter change transforms the semiconductor material from conventional amorphous silicon to a germanium-enhanced compound, achieving higher mobility while maintaining amorphous structure and compatibility with existing manufacturing processes.
Solution Approach 2:
The patent creates a composite semiconductor material by combining germanium, silicon, and oxygen in specific ratios to form oxygen-rich germanium-doped semiconductor compounds. This composite approach leverages the high mobility characteristics of germanium while maintaining the processability of silicon-based materials, resolving the contradiction between performance improvement and manufacturing complexity.
2Productivity
If germanium-doped semiconductor compound is used to improve mobility, then the performance for OLED display is improved, but the manufacturing complexity and material cost increase
Solution Approach 1:
The patent applies local quality by introducing germanium doping specifically in the semiconductor layer where high mobility is critical for OLED performance, while maintaining conventional amorphous silicon structure in other parts of the device. The germanium content is locally optimized (5-50 at%) in the active channel region, achieving performance improvement without requiring complete material replacement throughout the entire device structure.
Solution Approach 2:
The oxygen-rich germanium-doped semiconductor compound serves multiple functions: it provides high carrier mobility for OLED performance, maintains amorphous structure for simple manufacturing, and remains compatible with existing thin-film transistor fabrication processes. This multi-functionality resolves the contradiction between enhanced performance and manufacturing simplicity.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate; a first metal layer disposed on the substrate; an insulating layer disposed on the first metal layer; a semiconductor layer disposed on the insulating layer and including a germanium-doped semiconductor compound; and a second metal layer disposed on the semiconductor layer. A mobility of the semiconductor compound is greater than a mobility of amorphous silicon.